HONEYCOMB-270 Add isPresent() to Readers/Customizers

So that they can influence whether empty data is to be considered as present

+ Move registries implementations from util to impl
+ Introduce DelegatingReader trait
+ Extend GenericReader where possible to reduce duplication

Change-Id: I5a416acd0c4eab1fbc30fcbe585719991dbe9215
Signed-off-by: Maros Marsalek <mmarsale@cisco.com>

15 files changed, 120 insertions, 1466 deletions

diff --git a/infra/translate-utils/src/main/java/io/fd/honeycomb/translate/util/read/AbstractGenericReader.java b/infra/translate-utils/src/main/java/io/fd/honeycomb/translate/util/read/AbstractGenericReader.java
index 40c78b3c9..b19b72ecf 100644
--- a/infra/translate-utils/src/main/java/io/fd/honeycomb/translate/util/read/AbstractGenericReader.java
+++ b/infra/translate-utils/src/main/java/io/fd/honeycomb/translate/util/read/AbstractGenericReader.java
@@ -56,18 +56,15 @@ public abstract class AbstractGenericReader<D extends DataObject, B extends Buil
                                       @Nonnull final ReadContext ctx) throws ReadFailedException {
         LOG.debug("{}: Reading current: {}", this, id);
         final B builder = getBuilder(id);
-        // The empty value could be cached, but no caching is safer since we call overridden getBuilder each time
-        // and the build could produce something different (even if it shouldn't)
-        final D emptyValue = builder.build();
 
         LOG.trace("{}: Reading current attributes", this);
         readCurrentAttributes(id, builder, ctx);
 
         // Need to check whether anything was filled in to determine if data is present or not.
         final D built = builder.build();
-        final Optional<D> read = built.equals(emptyValue)
-            ? Optional.absent()
-            : Optional.of(built);
+        final Optional<D> read = isPresent(id, built, ctx)
+            ? Optional.of(built)
+            : Optional.absent();
 
         LOG.debug("{}: Current node read successfully. Result: {}", this, read);
         return read;
diff --git a/infra/translate-utils/src/main/java/io/fd/honeycomb/translate/util/read/BindingBrokerReader.java b/infra/translate-utils/src/main/java/io/fd/honeycomb/translate/util/read/BindingBrokerReader.java
index b7a38e97f..e59e642c4 100644
--- a/infra/translate-utils/src/main/java/io/fd/honeycomb/translate/util/read/BindingBrokerReader.java
+++ b/infra/translate-utils/src/main/java/io/fd/honeycomb/translate/util/read/BindingBrokerReader.java
@@ -50,6 +50,11 @@ public final class BindingBrokerReader<D extends DataObject, B extends Builder<D
         this.datastoreType = datastoreType;
     }
 
+    @Override
+    public boolean isPresent(final InstanceIdentifier<D> id, final D built, final ReadContext ctx) {
+        throw new UnsupportedOperationException("Not supported");
+    }
+
     @Nonnull
     @Override
     public Optional<? extends DataObject> read(@Nonnull final InstanceIdentifier<? extends DataObject> id,
diff --git a/infra/translate-utils/src/main/java/io/fd/honeycomb/translate/util/read/DelegatingReader.java b/infra/translate-utils/src/main/java/io/fd/honeycomb/translate/util/read/DelegatingReader.java
new file mode 100644
index 000000000..513639610
--- /dev/null
+++ b/infra/translate-utils/src/main/java/io/fd/honeycomb/translate/util/read/DelegatingReader.java
@@ -0,0 +1,103 @@
+/*
+ * Copyright (c) 2016 Cisco and/or its affiliates.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io.fd.honeycomb.translate.util.read;
+
+import com.google.common.base.Optional;
+import io.fd.honeycomb.translate.read.ListReader;
+import io.fd.honeycomb.translate.read.ReadContext;
+import io.fd.honeycomb.translate.read.ReadFailedException;
+import io.fd.honeycomb.translate.read.Reader;
+import java.util.List;
+import javax.annotation.Nonnull;
+import org.opendaylight.yangtools.concepts.Builder;
+import org.opendaylight.yangtools.yang.binding.DataObject;
+import org.opendaylight.yangtools.yang.binding.Identifiable;
+import org.opendaylight.yangtools.yang.binding.Identifier;
+import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
+
+/**
+ * A trait of a delegating reader. Delegates all the calls to its delegate.
+ */
+public interface DelegatingReader<D extends DataObject, B extends Builder<D>> extends Reader<D, B> {
+
+    Reader<D, B> getDelegate();
+
+    @Nonnull
+    default Optional<? extends DataObject> read(@Nonnull final InstanceIdentifier<? extends DataObject> id,
+                                                @Nonnull final ReadContext ctx) throws ReadFailedException {
+        return getDelegate().read(id, ctx);
+    }
+
+    default void readCurrentAttributes(@Nonnull final InstanceIdentifier<D> id,
+                                      @Nonnull final B builder,
+                                      @Nonnull final ReadContext ctx) throws ReadFailedException {
+        getDelegate().readCurrentAttributes(id, builder, ctx);
+    }
+
+    @Nonnull
+    default B getBuilder(final InstanceIdentifier<D> id) {
+        return getDelegate().getBuilder(id);
+    }
+
+    default void merge(@Nonnull final Builder<? extends DataObject> parentBuilder,
+                       @Nonnull final D readValue) {
+        getDelegate().merge(parentBuilder, readValue);
+    }
+
+    @Override
+    default boolean isPresent(InstanceIdentifier<D> id, D built, final ReadContext ctx) throws ReadFailedException {
+        return getDelegate().isPresent(id, built, ctx);
+    }
+
+    @Nonnull
+    default InstanceIdentifier<D> getManagedDataObjectType() {
+        return getDelegate().getManagedDataObjectType();
+    }
+
+    /**
+     * ListReader specific delegating trait.
+     */
+    interface DelegatingListReader<D extends DataObject & Identifiable<K>, K extends Identifier<D>, B extends Builder<D>>
+            extends DelegatingReader<D, B>, ListReader<D, K, B> {
+
+        ListReader<D, K, B> getDelegate();
+
+        @Override
+        default List<K> getAllIds(@Nonnull InstanceIdentifier<D> id, @Nonnull ReadContext ctx)
+                throws ReadFailedException {
+            return getDelegate().getAllIds(id, ctx);
+        }
+
+        @Nonnull
+        @Override
+        default List<D> readList(@Nonnull final InstanceIdentifier<D> id, @Nonnull final ReadContext ctx)
+                throws ReadFailedException {
+            return getDelegate().readList(id, ctx);
+        }
+
+        @Override
+        default void merge(@Nonnull final Builder<? extends DataObject> builder,
+                           @Nonnull final List<D> readData) {
+            getDelegate().merge(builder, readData);
+        }
+
+        @Override
+        default void merge(@Nonnull final Builder<? extends DataObject> parentBuilder, @Nonnull final D readValue) {
+            getDelegate().merge(parentBuilder, readValue);
+        }
+    }
+}
diff --git a/infra/translate-utils/src/main/java/io/fd/honeycomb/translate/util/read/KeepaliveReaderWrapper.java b/infra/translate-utils/src/main/java/io/fd/honeycomb/translate/util/read/KeepaliveReaderWrapper.java
index 5ab9bc59e..9a695a53c 100644
--- a/infra/translate-utils/src/main/java/io/fd/honeycomb/translate/util/read/KeepaliveReaderWrapper.java
+++ b/infra/translate-utils/src/main/java/io/fd/honeycomb/translate/util/read/KeepaliveReaderWrapper.java
@@ -18,11 +18,10 @@ package io.fd.honeycomb.translate.util.read;
 
 import com.google.common.base.Optional;
 import com.google.common.base.Preconditions;
-import io.fd.honeycomb.translate.read.ReadContext;
-import io.fd.honeycomb.translate.read.Reader;
 import io.fd.honeycomb.translate.MappingContext;
 import io.fd.honeycomb.translate.ModificationCache;
-import io.fd.honeycomb.translate.read.ReadFailedException;
+import io.fd.honeycomb.translate.read.ReadContext;
+import io.fd.honeycomb.translate.read.Reader;
 import java.io.Closeable;
 import java.util.concurrent.ScheduledExecutorService;
 import java.util.concurrent.ScheduledFuture;
@@ -40,7 +39,7 @@ import org.slf4j.LoggerFactory;
  * In case a specific error occurs, Keep-alive failure listener gets notified.
  */
 public final class KeepaliveReaderWrapper<D extends DataObject, B extends Builder<D>>
-        implements Reader<D, B>, Runnable, Closeable {
+        implements DelegatingReader<D, B>,Runnable, Closeable {
 
     private static final Logger LOG = LoggerFactory.getLogger(KeepaliveReaderWrapper.class);
 
@@ -73,34 +72,6 @@ public final class KeepaliveReaderWrapper<D extends DataObject, B extends Builde
         scheduledFuture = executor.scheduleWithFixedDelay(this, delayInSeconds, delayInSeconds, TimeUnit.SECONDS);
     }
 
-    @Nonnull
-    public Optional<? extends DataObject> read(@Nonnull final InstanceIdentifier id,
-                                               @Nonnull final ReadContext ctx) throws ReadFailedException {
-        return delegate.read(id, ctx);
-    }
-
-    public void readCurrentAttributes(@Nonnull final InstanceIdentifier<D> id,
-                                      @Nonnull final B builder,
-                                      @Nonnull final ReadContext ctx) throws ReadFailedException {
-        delegate.readCurrentAttributes(id, builder, ctx);
-    }
-
-    @Nonnull
-    public B getBuilder(final InstanceIdentifier<D> id) {
-        return delegate.getBuilder(id);
-    }
-
-    public void merge(@Nonnull final Builder<? extends DataObject> parentBuilder,
-                      @Nonnull final D readValue) {
-        delegate.merge(parentBuilder, readValue);
-    }
-
-    @Nonnull
-    @Override
-    public InstanceIdentifier<D> getManagedDataObjectType() {
-        return delegate.getManagedDataObjectType();
-    }
-
     @Override
     public void run() {
         LOG.trace("Invoking keepalive");
@@ -123,6 +94,11 @@ public final class KeepaliveReaderWrapper<D extends DataObject, B extends Builde
         scheduledFuture.cancel(false);
     }
 
+    @Override
+    public Reader<D, B> getDelegate() {
+        return delegate;
+    }
+
     /**
      * Listener that gets called whenever keepalive fails as expected.
      */
diff --git a/infra/translate-utils/src/main/java/io/fd/honeycomb/translate/util/read/ReflexiveReader.java b/infra/translate-utils/src/main/java/io/fd/honeycomb/translate/util/read/ReflexiveReader.java
deleted file mode 100644
index 2aa35514e..000000000
--- a/infra/translate-utils/src/main/java/io/fd/honeycomb/translate/util/read/ReflexiveReader.java
+++ /dev/null
@@ -1,57 +0,0 @@
-/*
- * Copyright (c) 2016 Cisco and/or its affiliates.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at:
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package io.fd.honeycomb.translate.util.read;
-
-import io.fd.honeycomb.translate.read.ReadContext;
-import io.fd.honeycomb.translate.read.ReadFailedException;
-import javax.annotation.Nonnull;
-import org.opendaylight.yangtools.concepts.Builder;
-import org.opendaylight.yangtools.yang.binding.DataObject;
-import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
-
-/**
- * Reader that performs no read operation on its own, just fills in the hierarchy.
- * <p/>
- * Might be slow due to reflection !
- */
-public class ReflexiveReader<C extends DataObject, B extends Builder<C>> extends AbstractGenericReader<C, B> {
-
-    private final ReflexiveReaderCustomizer<C, B> customizer;
-
-    public ReflexiveReader(final InstanceIdentifier<C> identifier, final Class<B> builderClass) {
-        super(identifier);
-        this.customizer = new ReflexiveReaderCustomizer<>(identifier.getTargetType(), builderClass);
-    }
-
-    @Override
-    public void readCurrentAttributes(@Nonnull final InstanceIdentifier<C> id, @Nonnull final B builder,
-                                      @Nonnull final ReadContext ctx)
-            throws ReadFailedException {
-        customizer.readCurrentAttributes(id, builder, ctx);
-    }
-
-    @Nonnull
-    @Override
-    public B getBuilder(final InstanceIdentifier<C> id) {
-        return customizer.getBuilder(id);
-    }
-
-    @Override
-    public void merge(@Nonnull final Builder<? extends DataObject> parentBuilder, @Nonnull final C readValue) {
-        customizer.merge(parentBuilder, readValue);
-    }
-}
diff --git a/infra/translate-utils/src/main/java/io/fd/honeycomb/translate/util/read/ReflexiveReaderCustomizer.java b/infra/translate-utils/src/main/java/io/fd/honeycomb/translate/util/read/ReflexiveReaderCustomizer.java
index 18e6285f3..087873306 100644
--- a/infra/translate-utils/src/main/java/io/fd/honeycomb/translate/util/read/ReflexiveReaderCustomizer.java
+++ b/infra/translate-utils/src/main/java/io/fd/honeycomb/translate/util/read/ReflexiveReaderCustomizer.java
@@ -33,7 +33,7 @@ import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
 /**
  * Might be slow.
  */
-class ReflexiveReaderCustomizer<C extends DataObject, B extends Builder<C>> extends NoopReaderCustomizer<C, B> {
+public class ReflexiveReaderCustomizer<C extends DataObject, B extends Builder<C>> extends NoopReaderCustomizer<C, B> {
 
     private final Class<C> typeClass;
     private final Class<B> builderClass;
diff --git a/infra/translate-utils/src/main/java/io/fd/honeycomb/translate/util/read/registry/CompositeReader.java b/infra/translate-utils/src/main/java/io/fd/honeycomb/translate/util/read/registry/CompositeReader.java
deleted file mode 100644
index b52fd09ec..000000000
--- a/infra/translate-utils/src/main/java/io/fd/honeycomb/translate/util/read/registry/CompositeReader.java
+++ /dev/null
@@ -1,241 +0,0 @@
-/*
- * Copyright (c) 2016 Cisco and/or its affiliates.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at:
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package io.fd.honeycomb.translate.util.read.registry;
-
-import static com.google.common.base.Preconditions.checkArgument;
-
-import com.google.common.annotations.VisibleForTesting;
-import com.google.common.base.Optional;
-import com.google.common.collect.ImmutableMap;
-import com.google.common.collect.Iterables;
-import io.fd.honeycomb.translate.read.InitFailedException;
-import io.fd.honeycomb.translate.read.InitListReader;
-import io.fd.honeycomb.translate.read.Initializer;
-import io.fd.honeycomb.translate.read.ListReader;
-import io.fd.honeycomb.translate.read.ReadContext;
-import io.fd.honeycomb.translate.read.ReadFailedException;
-import io.fd.honeycomb.translate.read.Reader;
-import io.fd.honeycomb.translate.util.RWUtils;
-import io.fd.honeycomb.translate.util.read.AbstractGenericReader;
-import java.util.ArrayList;
-import java.util.Collections;
-import java.util.List;
-import javax.annotation.Nonnull;
-import org.opendaylight.controller.md.sal.binding.api.DataBroker;
-import org.opendaylight.yangtools.concepts.Builder;
-import org.opendaylight.yangtools.yang.binding.DataObject;
-import org.opendaylight.yangtools.yang.binding.Identifiable;
-import org.opendaylight.yangtools.yang.binding.Identifier;
-import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
-class CompositeReader<D extends DataObject, B extends Builder<D>>
-        extends AbstractGenericReader<D, B>
-        implements Initializer<D> {
-
-    private static final Logger LOG = LoggerFactory.getLogger(CompositeReader.class);
-
-    private final Reader<D, B> delegate;
-    private final ImmutableMap<Class<?>, Reader<? extends DataObject, ? extends Builder<?>>> childReaders;
-
-    private CompositeReader(final Reader<D, B> reader,
-                            final ImmutableMap<Class<?>, Reader<? extends DataObject, ? extends Builder<?>>> childReaders) {
-        super(reader.getManagedDataObjectType());
-        this.delegate = reader;
-        this.childReaders = childReaders;
-    }
-
-    @VisibleForTesting
-    ImmutableMap<Class<?>, Reader<? extends DataObject, ? extends Builder<?>>> getChildReaders() {
-        return childReaders;
-    }
-
-    @SuppressWarnings("unchecked")
-    public static <D extends DataObject> InstanceIdentifier<D> appendTypeToId(
-        final InstanceIdentifier<? extends DataObject> parentId, final InstanceIdentifier<D> type) {
-        final InstanceIdentifier.PathArgument t = new InstanceIdentifier.Item<>(type.getTargetType());
-        return (InstanceIdentifier<D>) InstanceIdentifier.create(Iterables.concat(
-            parentId.getPathArguments(), Collections.singleton(t)));
-    }
-
-    @Nonnull
-    @Override
-    public Optional<? extends DataObject> read(@Nonnull final InstanceIdentifier<? extends DataObject> id,
-                                               @Nonnull final ReadContext ctx) throws ReadFailedException {
-        if (shouldReadCurrent(id)) {
-            LOG.trace("{}: Reading current: {}", this, id);
-            return readCurrent((InstanceIdentifier<D>) id, ctx);
-        } else if (shouldDelegateToChild(id)) {
-            LOG.trace("{}: Reading child: {}", this, id);
-            return readSubtree(id, ctx);
-        } else {
-            // Fallback
-            LOG.trace("{}: Delegating read: {}", this, id);
-            return delegate.read(id, ctx);
-        }
-    }
-
-    private boolean shouldReadCurrent(@Nonnull final InstanceIdentifier<? extends DataObject> id) {
-        return id.getTargetType().equals(getManagedDataObjectType().getTargetType());
-    }
-
-    private boolean shouldDelegateToChild(@Nonnull final InstanceIdentifier<? extends DataObject> id) {
-        return childReaders.containsKey(RWUtils.getNextId(id, getManagedDataObjectType()).getType());
-    }
-
-    private Optional<? extends DataObject> readSubtree(final InstanceIdentifier<? extends DataObject> id,
-                                                       final ReadContext ctx) throws ReadFailedException {
-        final InstanceIdentifier.PathArgument nextId = RWUtils.getNextId(id, getManagedDataObjectType());
-        final Reader<?, ? extends Builder<?>> nextReader = childReaders.get(nextId.getType());
-        checkArgument(nextReader != null, "Unable to read: %s. No delegate present, available readers at next level: %s",
-                id, childReaders.keySet());
-        return nextReader.read(id, ctx);
-    }
-
-    @SuppressWarnings("unchecked")
-    private void readChildren(final InstanceIdentifier<D> id, @Nonnull final ReadContext ctx, final B builder)
-            throws ReadFailedException {
-        LOG.debug("{}: Reading children: {}", this, childReaders.keySet());
-        for (Reader child : childReaders.values()) {
-            final InstanceIdentifier childId = appendTypeToId(id, child.getManagedDataObjectType());
-
-            LOG.debug("{}: Reading child from: {}", this, child);
-            if (child instanceof ListReader) {
-                final List<? extends DataObject> list = ((ListReader) child).readList(childId, ctx);
-                // Dont set empty lists
-                if (!list.isEmpty()) {
-                    ((ListReader) child).merge(builder, list);
-                }
-            } else {
-                final Optional<? extends DataObject> read = child.read(childId, ctx);
-                if (read.isPresent()) {
-                    child.merge(builder, read.get());
-                }
-            }
-        }
-    }
-
-    @Override
-    public void readCurrentAttributes(@Nonnull final InstanceIdentifier<D> id, @Nonnull final B builder,
-                                      @Nonnull final ReadContext ctx)
-            throws ReadFailedException {
-        delegate.readCurrentAttributes(id, builder, ctx);
-        readChildren(id, ctx, builder);
-    }
-
-    @Nonnull
-    @Override
-    public B getBuilder(final InstanceIdentifier<D> id) {
-        return delegate.getBuilder(id);
-    }
-
-    @Override
-    public void merge(@Nonnull final Builder<? extends DataObject> parentBuilder, @Nonnull final D readValue) {
-        delegate.merge(parentBuilder, readValue);
-    }
-
-    /**
-     * Wrap a Reader as a Composite Reader.
-     */
-    static <D extends DataObject, B extends Builder<D>> Reader<D, B> createForReader(
-            @Nonnull final Reader<D, B> reader,
-            @Nonnull final ImmutableMap<Class<?>, Reader<?, ? extends Builder<?>>> childReaders) {
-
-        return (reader instanceof ListReader)
-                ? new CompositeListReader<>((ListReader) reader, childReaders)
-                : new CompositeReader<>(reader, childReaders);
-    }
-
-    @SuppressWarnings("unchecked")
-    @Override
-    public void init(final DataBroker broker, final InstanceIdentifier<D> id, final ReadContext ctx) throws InitFailedException {
-        if (delegate instanceof Initializer) {
-            LOG.trace("{}: Initializing current: {}", this, id);
-            ((Initializer<D>) delegate).init(broker, id, ctx);
-        }
-
-        for (Reader child : childReaders.values()) {
-            final InstanceIdentifier childId = appendTypeToId(id, child.getManagedDataObjectType());
-
-            if (child instanceof Initializer) {
-                LOG.trace("{}: Initializing child: {}", this, childId);
-                ((Initializer) child).init(broker, childId, ctx);
-            }
-        }
-    }
-
-    private static class CompositeListReader<D extends DataObject & Identifiable<K>, B extends Builder<D>, K extends Identifier<D>>
-            extends CompositeReader<D, B>
-            implements InitListReader<D, K, B> {
-
-        private final ListReader<D, K, B> delegate;
-
-        private CompositeListReader(final ListReader<D, K, B> reader,
-                                    final ImmutableMap<Class<?>, Reader<? extends DataObject, ? extends Builder<?>>> childReaders) {
-            super(reader, childReaders);
-            this.delegate = reader;
-        }
-
-        @Nonnull
-        @Override
-        public List<D> readList(@Nonnull final InstanceIdentifier<D> id, @Nonnull final ReadContext ctx)
-                throws ReadFailedException {
-            LOG.trace("{}: Reading all list entries", this);
-            final List<K> allIds = delegate.getAllIds(id, ctx);
-            LOG.debug("{}: Reading list entries for: {}", this, allIds);
-
-            // Override read list in order to perform readCurrent + readChildren here
-            final ArrayList<D> allEntries = new ArrayList<>(allIds.size());
-            for (K key : allIds) {
-                final InstanceIdentifier.IdentifiableItem<D, K> currentBdItem = RWUtils.getCurrentIdItem(id, key);
-                final InstanceIdentifier<D> keyedId = RWUtils.replaceLastInId(id, currentBdItem);
-                final Optional<D> read = readCurrent(keyedId, ctx);
-                if (read.isPresent()) {
-                    final DataObject singleItem = read.get();
-                    checkArgument(getManagedDataObjectType().getTargetType().isAssignableFrom(singleItem.getClass()));
-                    allEntries.add(getManagedDataObjectType().getTargetType().cast(singleItem));
-                }
-            }
-            return allEntries;
-        }
-
-        @Override
-        public void init(final DataBroker broker, final InstanceIdentifier<D> id, final ReadContext ctx)
-                throws InitFailedException {
-            try {
-                final List<K> allIds = delegate.getAllIds(id, ctx);
-                for (K key : allIds) {
-                    super.init(broker, RWUtils.replaceLastInId(id, RWUtils.getCurrentIdItem(id, key)), ctx);
-                }
-            } catch (ReadFailedException e) {
-                throw new InitFailedException(id, e);
-            }
-        }
-
-        @Override
-        public void merge(@Nonnull final Builder<? extends DataObject> builder, @Nonnull final List<D> readData) {
-            delegate.merge(builder, readData);
-        }
-
-        @Override
-        public List<K> getAllIds(@Nonnull final InstanceIdentifier<D> id,
-                                 @Nonnull final ReadContext ctx) throws ReadFailedException {
-            return delegate.getAllIds(id, ctx);
-        }
-    }
-}
diff --git a/infra/translate-utils/src/main/java/io/fd/honeycomb/translate/util/read/registry/CompositeReaderRegistry.java b/infra/translate-utils/src/main/java/io/fd/honeycomb/translate/util/read/registry/CompositeReaderRegistry.java
deleted file mode 100644
index 9505a7730..000000000
--- a/infra/translate-utils/src/main/java/io/fd/honeycomb/translate/util/read/registry/CompositeReaderRegistry.java
+++ /dev/null
@@ -1,131 +0,0 @@
-/*
- * Copyright (c) 2016 Cisco and/or its affiliates.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at:
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package io.fd.honeycomb.translate.util.read.registry;
-
-import static com.google.common.base.Preconditions.checkNotNull;
-
-import com.google.common.annotations.VisibleForTesting;
-import com.google.common.base.Optional;
-import com.google.common.collect.Iterables;
-import com.google.common.collect.LinkedListMultimap;
-import com.google.common.collect.Multimap;
-import io.fd.honeycomb.translate.read.InitFailedException;
-import io.fd.honeycomb.translate.read.Initializer;
-import io.fd.honeycomb.translate.read.ListReader;
-import io.fd.honeycomb.translate.read.ReadContext;
-import io.fd.honeycomb.translate.read.ReadFailedException;
-import io.fd.honeycomb.translate.read.Reader;
-import io.fd.honeycomb.translate.read.registry.ReaderRegistry;
-import io.fd.honeycomb.translate.util.RWUtils;
-import java.util.Collections;
-import java.util.List;
-import java.util.Map;
-import java.util.stream.Collectors;
-import javax.annotation.Nonnull;
-import org.opendaylight.controller.md.sal.binding.api.DataBroker;
-import org.opendaylight.yangtools.concepts.Builder;
-import org.opendaylight.yangtools.yang.binding.DataObject;
-import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
-/**
- * Simple reader registry able to perform and aggregated read (ROOT read) on top of all provided readers. Also able to
- * delegate a specific read to one of the delegate readers.
- * <p/>
- * This could serve as a utility to hold & hide all available readers in upper layers.
- */
-public final class CompositeReaderRegistry implements ReaderRegistry {
-
-    private static final Logger LOG = LoggerFactory.getLogger(CompositeReaderRegistry.class);
-
-    private final Map<Class<? extends DataObject>, Reader<? extends DataObject, ? extends Builder<?>>> rootReaders;
-
-    /**
-     * Create new {@link CompositeReaderRegistry}.
-     *
-     * @param rootReaders List of delegate readers
-     */
-    public CompositeReaderRegistry(@Nonnull final List<Reader<? extends DataObject, ? extends Builder<?>>> rootReaders) {
-        this.rootReaders = RWUtils.uniqueLinkedIndex(checkNotNull(rootReaders), RWUtils.MANAGER_CLASS_FUNCTION);
-    }
-
-    @VisibleForTesting
-    Map<Class<? extends DataObject>, Reader<? extends DataObject, ? extends Builder<?>>> getRootReaders() {
-        return rootReaders;
-    }
-
-    @Override
-    @Nonnull
-    public Multimap<InstanceIdentifier<? extends DataObject>, ? extends DataObject> readAll(
-        @Nonnull final ReadContext ctx) throws ReadFailedException {
-
-        LOG.debug("Reading from all delegates: {}", this);
-        LOG.trace("Reading from all delegates: {}", rootReaders.values());
-
-        final Multimap<InstanceIdentifier<? extends DataObject>, DataObject> objects = LinkedListMultimap.create();
-        for (Reader<? extends DataObject, ? extends Builder<?>> rootReader : rootReaders.values()) {
-            LOG.debug("Reading from delegate: {}", rootReader);
-
-            if (rootReader instanceof ListReader) {
-                final List<? extends DataObject> listEntries =
-                        ((ListReader) rootReader).readList(rootReader.getManagedDataObjectType(), ctx);
-                if (!listEntries.isEmpty()) {
-                    objects.putAll(rootReader.getManagedDataObjectType(), listEntries);
-                }
-            } else {
-                final Optional<? extends DataObject> read = rootReader.read(rootReader.getManagedDataObjectType(), ctx);
-                if (read.isPresent()) {
-                    objects.putAll(rootReader.getManagedDataObjectType(), Collections.singletonList(read.get()));
-                }
-            }
-        }
-
-        return objects;
-    }
-
-
-    @Override
-    public void initAll(@Nonnull final DataBroker broker, @Nonnull final ReadContext ctx) throws InitFailedException {
-        for (Reader<? extends DataObject, ? extends Builder<?>> rootReader : rootReaders.values()) {
-            if (rootReader instanceof Initializer<?>) {
-                ((Initializer) rootReader).init(broker, rootReader.getManagedDataObjectType(), ctx);
-            }
-        }
-    }
-
-    @Nonnull
-    @Override
-    public Optional<? extends DataObject> read(@Nonnull final InstanceIdentifier<? extends DataObject> id,
-                                               @Nonnull final ReadContext ctx)
-            throws ReadFailedException {
-        final InstanceIdentifier.PathArgument first = checkNotNull(
-                Iterables.getFirst(id.getPathArguments(), null), "Empty id");
-        final Reader<? extends DataObject, ? extends Builder<?>> reader = rootReaders.get(first.getType());
-        checkNotNull(reader,
-                "Unable to read %s. Missing reader. Current readers for: %s", id, rootReaders.keySet());
-        LOG.debug("Reading from delegate: {}", reader);
-        return reader.read(id, ctx);
-    }
-
-    @Override
-    public String toString() {
-        return getClass().getSimpleName()
-                + rootReaders.keySet().stream().map(Class::getSimpleName).collect(Collectors.toList());
-    }
-
-}
diff --git a/infra/translate-utils/src/main/java/io/fd/honeycomb/translate/util/read/registry/CompositeReaderRegistryBuilder.java b/infra/translate-utils/src/main/java/io/fd/honeycomb/translate/util/read/registry/CompositeReaderRegistryBuilder.java
deleted file mode 100644
index da9bbe934..000000000
--- a/infra/translate-utils/src/main/java/io/fd/honeycomb/translate/util/read/registry/CompositeReaderRegistryBuilder.java
+++ /dev/null
@@ -1,114 +0,0 @@
-/*
- * Copyright (c) 2016 Cisco and/or its affiliates.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at:
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package io.fd.honeycomb.translate.util.read.registry;
-
-import com.google.common.collect.ImmutableMap;
-import io.fd.honeycomb.translate.read.InitReader;
-import io.fd.honeycomb.translate.read.Reader;
-import io.fd.honeycomb.translate.read.registry.ModifiableReaderRegistryBuilder;
-import io.fd.honeycomb.translate.read.registry.ReaderRegistry;
-import io.fd.honeycomb.translate.read.registry.ReaderRegistryBuilder;
-import io.fd.honeycomb.translate.util.AbstractSubtreeManagerRegistryBuilderBuilder;
-import io.fd.honeycomb.translate.util.read.ReflexiveReader;
-import java.util.ArrayList;
-import java.util.List;
-import java.util.Set;
-import java.util.stream.Collectors;
-import javax.annotation.Nonnull;
-import javax.annotation.concurrent.NotThreadSafe;
-import org.opendaylight.yangtools.concepts.Builder;
-import org.opendaylight.yangtools.yang.binding.DataObject;
-import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
-@NotThreadSafe
-public final class CompositeReaderRegistryBuilder
-        extends AbstractSubtreeManagerRegistryBuilderBuilder<Reader<? extends DataObject, ? extends Builder<?>>, ReaderRegistry>
-        implements ModifiableReaderRegistryBuilder, ReaderRegistryBuilder {
-
-    private static final Logger LOG = LoggerFactory.getLogger(CompositeReaderRegistryBuilder.class);
-
-    @Override
-    protected Reader<? extends DataObject, ? extends Builder<?>> getSubtreeHandler(@Nonnull final Set<InstanceIdentifier<?>> handledChildren,
-                                                                                   @Nonnull final Reader<? extends DataObject, ? extends Builder<?>> reader) {
-        return reader instanceof InitReader
-                ? InitSubtreeReader.createForReader(handledChildren, reader)
-                : SubtreeReader.createForReader(handledChildren, reader);
-    }
-
-    @Override
-    public <D extends DataObject> void addStructuralReader(@Nonnull InstanceIdentifier<D> id,
-                                                           @Nonnull Class<? extends Builder<D>> builderType) {
-        add(new ReflexiveReader<>(id, builderType));
-    }
-
-
-
-    /**
-     * Create {@link CompositeReaderRegistry} with Readers ordered according to submitted relationships.
-     * <p/>
-     * Note: The ordering only applies between nodes on the same level, inter-level and inter-subtree relationships are
-     * ignored.
-     */
-    @Override
-    public ReaderRegistry build() {
-        ImmutableMap<InstanceIdentifier<?>, Reader<? extends DataObject, ? extends Builder<?>>> mappedReaders =
-                getMappedHandlers();
-        LOG.debug("Building Reader registry with Readers: {}",
-                mappedReaders.keySet().stream()
-                        .map(InstanceIdentifier::getTargetType)
-                        .map(Class::getSimpleName)
-                        .collect(Collectors.joining(", ")));
-
-        LOG.trace("Building Reader registry with Readers: {}", mappedReaders);
-        final List<InstanceIdentifier<?>> readerOrder = new ArrayList<>(mappedReaders.keySet());
-
-        // Wrap readers into composite readers recursively, collect roots and create registry
-        final TypeHierarchy typeHierarchy = TypeHierarchy.create(mappedReaders.keySet());
-        final List<Reader<? extends DataObject, ? extends Builder<?>>> orderedRootReaders =
-                typeHierarchy.getRoots().stream()
-                        .map(rootId -> toCompositeReader(rootId, mappedReaders, typeHierarchy))
-                        .collect(Collectors.toList());
-
-        // We are violating the ordering from mappedReaders, since we are forming a composite structure
-        // but at least order root writers
-        orderedRootReaders.sort((reader1, reader2) -> readerOrder.indexOf(reader1.getManagedDataObjectType())
-                - readerOrder.indexOf(reader2.getManagedDataObjectType()));
-
-        return new CompositeReaderRegistry(orderedRootReaders);
-    }
-
-    private Reader<? extends DataObject, ? extends Builder<?>> toCompositeReader(
-            final InstanceIdentifier<?> instanceIdentifier,
-            final ImmutableMap<InstanceIdentifier<?>, Reader<? extends DataObject, ? extends Builder<?>>> mappedReaders,
-            final TypeHierarchy typeHierarchy) {
-
-        // Order child readers according to the mappedReadersCollection
-        final ImmutableMap.Builder<Class<?>, Reader<?, ? extends Builder<?>>> childReadersMapB = ImmutableMap.builder();
-        for (InstanceIdentifier<?> childId : mappedReaders.keySet()) {
-            if (typeHierarchy.getDirectChildren(instanceIdentifier).contains(childId)) {
-                childReadersMapB.put(childId.getTargetType(), toCompositeReader(childId, mappedReaders, typeHierarchy));
-            }
-        }
-
-        final ImmutableMap<Class<?>, Reader<?, ? extends Builder<?>>> childReadersMap = childReadersMapB.build();
-        return childReadersMap.isEmpty()
-                ? mappedReaders.get(instanceIdentifier)
-                : CompositeReader.createForReader(mappedReaders.get(instanceIdentifier), childReadersMap);
-    }
-}
diff --git a/infra/translate-utils/src/main/java/io/fd/honeycomb/translate/util/read/registry/InitSubtreeReader.java b/infra/translate-utils/src/main/java/io/fd/honeycomb/translate/util/read/registry/InitSubtreeReader.java
deleted file mode 100644
index 4edc38f9d..000000000
--- a/infra/translate-utils/src/main/java/io/fd/honeycomb/translate/util/read/registry/InitSubtreeReader.java
+++ /dev/null
@@ -1,72 +0,0 @@
-/*
- * Copyright (c) 2016 Cisco and/or its affiliates.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at:
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package io.fd.honeycomb.translate.util.read.registry;
-
-import io.fd.honeycomb.translate.read.InitFailedException;
-import io.fd.honeycomb.translate.read.InitListReader;
-import io.fd.honeycomb.translate.read.InitReader;
-import io.fd.honeycomb.translate.read.ListReader;
-import io.fd.honeycomb.translate.read.ReadContext;
-import io.fd.honeycomb.translate.read.Reader;
-import java.util.Set;
-import javax.annotation.Nonnull;
-import org.opendaylight.controller.md.sal.binding.api.DataBroker;
-import org.opendaylight.yangtools.concepts.Builder;
-import org.opendaylight.yangtools.yang.binding.DataObject;
-import org.opendaylight.yangtools.yang.binding.Identifiable;
-import org.opendaylight.yangtools.yang.binding.Identifier;
-import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
-
-class InitSubtreeReader<O extends DataObject, B extends Builder<O>>
-        extends SubtreeReader<O, B>
-        implements InitReader<O, B> {
-
-    private InitSubtreeReader(final InitReader<O, B> delegate,
-                              final Set<InstanceIdentifier<?>> handledTypes) {
-        super(delegate, handledTypes);
-    }
-
-    @Override
-    public void init(final DataBroker broker, final InstanceIdentifier<O> id, final ReadContext ctx) throws InitFailedException {
-        ((InitReader<O, B>) delegate).init(broker, id, ctx);
-    }
-
-    /**
-     * Wrap a Reader as an initializing subtree Reader.
-     */
-    static <D extends DataObject, B extends Builder<D>> Reader<D, B> createForReader(@Nonnull final Set<InstanceIdentifier<?>> handledChildren,
-                                                                                     @Nonnull final Reader<D, B> reader) {
-        return (reader instanceof ListReader)
-                ? new InitSubtreeListReader<>((InitListReader) reader, handledChildren)
-                : new InitSubtreeReader<>(((InitReader<D, B>) reader), handledChildren);
-    }
-
-    private static class InitSubtreeListReader<D extends DataObject & Identifiable<K>, B extends Builder<D>, K extends Identifier<D>>
-            extends SubtreeListReader<D, B, K>
-            implements InitListReader<D, K, B> {
-
-        InitSubtreeListReader(final InitListReader<D, K, B> delegate,
-                              final Set<InstanceIdentifier<?>> handledTypes) {
-            super(delegate, handledTypes);
-        }
-
-        @Override
-        public void init(final DataBroker broker, final InstanceIdentifier<D> id, final ReadContext ctx) throws InitFailedException {
-            ((InitListReader<D, K, B>) delegate).init(broker, id, ctx);
-        }
-    }
-}
diff --git a/infra/translate-utils/src/main/java/io/fd/honeycomb/translate/util/read/registry/SubtreeReader.java b/infra/translate-utils/src/main/java/io/fd/honeycomb/translate/util/read/registry/SubtreeReader.java
deleted file mode 100644
index 3bc76b19a..000000000
--- a/infra/translate-utils/src/main/java/io/fd/honeycomb/translate/util/read/registry/SubtreeReader.java
+++ /dev/null
@@ -1,241 +0,0 @@
-/*
- * Copyright (c) 2016 Cisco and/or its affiliates.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at:
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package io.fd.honeycomb.translate.util.read.registry;
-
-import static com.google.common.base.Preconditions.checkArgument;
-
-import com.google.common.base.Optional;
-import com.google.common.collect.Iterables;
-import io.fd.honeycomb.translate.read.ListReader;
-import io.fd.honeycomb.translate.read.ReadContext;
-import io.fd.honeycomb.translate.read.ReadFailedException;
-import io.fd.honeycomb.translate.read.Reader;
-import io.fd.honeycomb.translate.util.RWUtils;
-import io.fd.honeycomb.translate.util.ReflectionUtils;
-import java.lang.reflect.InvocationTargetException;
-import java.lang.reflect.Method;
-import java.util.Collections;
-import java.util.HashSet;
-import java.util.List;
-import java.util.Set;
-import javax.annotation.Nonnull;
-import org.opendaylight.yangtools.concepts.Builder;
-import org.opendaylight.yangtools.yang.binding.DataObject;
-import org.opendaylight.yangtools.yang.binding.Identifiable;
-import org.opendaylight.yangtools.yang.binding.Identifier;
-import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
-/**
- * Simple Reader delegate for subtree Readers (Readers handling also children nodes) providing a list of all the
- * children nodes being handled.
- */
-class SubtreeReader<D extends DataObject, B extends Builder<D>> implements Reader<D, B> {
-
-    private static final Logger LOG = LoggerFactory.getLogger(SubtreeReader.class);
-
-    protected final Reader<D, B> delegate;
-    private final Set<InstanceIdentifier<?>> handledChildTypes = new HashSet<>();
-
-    SubtreeReader(final Reader<D, B> delegate, Set<InstanceIdentifier<?>> handledTypes) {
-        this.delegate = delegate;
-        for (InstanceIdentifier<?> handledType : handledTypes) {
-            // Iid has to start with Reader's handled root type
-            checkArgument(delegate.getManagedDataObjectType().getTargetType().equals(
-                    handledType.getPathArguments().iterator().next().getType()),
-                    "Handled node from subtree has to be identified by an instance identifier starting from: %s."
-                            + "Instance identifier was: %s", getManagedDataObjectType().getTargetType(), handledType);
-            checkArgument(Iterables.size(handledType.getPathArguments()) > 1,
-                    "Handled node from subtree identifier too short: %s", handledType);
-            handledChildTypes.add(InstanceIdentifier.create(Iterables.concat(
-                    getManagedDataObjectType().getPathArguments(), Iterables.skip(handledType.getPathArguments(), 1))));
-        }
-    }
-
-    /**
-     * Return set of types also handled by this Reader. All of the types are children of the type managed by this Reader
-     * excluding the type of this Reader.
-     */
-    Set<InstanceIdentifier<?>> getHandledChildTypes() {
-        return handledChildTypes;
-    }
-
-    @Override
-    @Nonnull
-    public Optional<? extends DataObject> read(
-            @Nonnull final InstanceIdentifier<? extends DataObject> id,
-            @Nonnull final ReadContext ctx) throws ReadFailedException {
-        final InstanceIdentifier<?> wildcarded = RWUtils.makeIidWildcarded(id);
-
-        // Reading entire subtree and filtering if is current reader responsible
-        if (getHandledChildTypes().contains(wildcarded)) {
-            LOG.debug("{}: Subtree node managed by this writer requested: {}. Reading current and filtering", this, id);
-            // If there's no dedicated reader, use read current
-            final InstanceIdentifier<D> currentId = RWUtils.cutId(id, getManagedDataObjectType());
-            final Optional<? extends DataObject> current = delegate.read(currentId, ctx);
-            // then perform post-reading filtering (return only requested sub-node)
-            final Optional<? extends DataObject> readSubtree = current.isPresent()
-                ? filterSubtree(current.get(), id, getManagedDataObjectType().getTargetType())
-                : current;
-
-            LOG.debug("{}: Subtree: {} read successfully. Result: {}", this, id, readSubtree);
-            return readSubtree;
-
-        // If child that's handled here is not requested, then delegate should be able to handle the read
-        } else {
-            return delegate.read(id, ctx);
-        }
-    }
-
-    @Override
-    public void readCurrentAttributes(@Nonnull final InstanceIdentifier<D> id, @Nonnull final B builder,
-                                      @Nonnull final ReadContext ctx)
-            throws ReadFailedException {
-        delegate.readCurrentAttributes(id, builder, ctx);
-    }
-
-    @Nonnull
-    @Override
-    public B getBuilder(final InstanceIdentifier<D> id) {
-        return delegate.getBuilder(id);
-    }
-
-    @Override
-    public void merge(@Nonnull final Builder<? extends DataObject> parentBuilder, @Nonnull final D readValue) {
-        delegate.merge(parentBuilder, readValue);
-    }
-
-    @Nonnull
-    private static Optional<? extends DataObject> filterSubtree(@Nonnull final DataObject parent,
-                                                                @Nonnull final InstanceIdentifier<? extends DataObject> absolutPath,
-                                                                @Nonnull final Class<?> managedType) {
-        final InstanceIdentifier.PathArgument nextId =
-                RWUtils.getNextId(absolutPath, InstanceIdentifier.create(parent.getClass()));
-
-        final Optional<? extends DataObject> nextParent = findNextParent(parent, nextId, managedType);
-
-        if (Iterables.getLast(absolutPath.getPathArguments()).equals(nextId)) {
-            return nextParent; // we found the dataObject identified by absolutePath
-        } else if (nextParent.isPresent()) {
-            return filterSubtree(nextParent.get(), absolutPath, nextId.getType());
-        } else {
-            return nextParent; // we can't go further, return Optional.absent()
-        }
-    }
-
-    private static Optional<? extends DataObject> findNextParent(@Nonnull final DataObject parent,
-                                                                 @Nonnull final InstanceIdentifier.PathArgument nextId,
-                                                                 @Nonnull final Class<?> managedType) {
-        Optional<Method> method = ReflectionUtils.findMethodReflex(managedType, "get",
-                Collections.emptyList(), nextId.getType());
-
-        if (method.isPresent()) {
-            return Optional.fromNullable(filterSingle(parent, nextId, method.get()));
-        } else {
-            // List child nodes
-            method = ReflectionUtils.findMethodReflex(managedType,
-                    "get" + nextId.getType().getSimpleName(), Collections.emptyList(), List.class);
-
-            if (method.isPresent()) {
-                return filterList(parent, nextId, method.get());
-            } else {
-                throw new IllegalStateException(
-                        "Unable to filter " + nextId + " from " + parent + " getters not found using reflexion");
-            }
-        }
-    }
-
-    @SuppressWarnings("unchecked")
-    private static Optional<? extends DataObject> filterList(final DataObject parent,
-                                                             final InstanceIdentifier.PathArgument nextId,
-                                                             final Method method) {
-        final List<? extends DataObject> invoke = (List<? extends DataObject>) invoke(method, nextId, parent);
-
-        checkArgument(nextId instanceof InstanceIdentifier.IdentifiableItem<?, ?>,
-                "Unable to perform wildcarded read for %s", nextId);
-        final Identifier key = ((InstanceIdentifier.IdentifiableItem) nextId).getKey();
-
-        final Method keyGetter = ReflectionUtils.findMethodReflex(nextId.getType(), "get",
-                        Collections.emptyList(), key.getClass()).get();
-
-        return Optional.fromNullable(invoke.stream()
-                .filter(item -> key.equals(invoke(keyGetter, nextId, item)))
-                .findFirst().orElse(null));
-    }
-
-    private static DataObject filterSingle(final DataObject parent,
-                                           final InstanceIdentifier.PathArgument nextId, final Method method) {
-        return nextId.getType().cast(invoke(method, nextId, parent));
-    }
-
-    private static Object invoke(final Method method,
-                                 final InstanceIdentifier.PathArgument nextId, final DataObject parent) {
-        try {
-            return method.invoke(parent);
-        } catch (IllegalAccessException | InvocationTargetException e) {
-            throw new IllegalArgumentException("Unable to get " + nextId + " from " + parent, e);
-        }
-    }
-
-    @Override
-    @Nonnull
-    public InstanceIdentifier<D> getManagedDataObjectType() {
-        return delegate.getManagedDataObjectType();
-    }
-
-    /**
-     * Wrap a Reader as a subtree Reader.
-     */
-    static <D extends DataObject, B extends Builder<D>> Reader<D, B> createForReader(@Nonnull final Set<InstanceIdentifier<?>> handledChildren,
-                                                                                     @Nonnull final Reader<D, B> reader) {
-        return (reader instanceof ListReader)
-                ? new SubtreeListReader<>((ListReader) reader, handledChildren)
-                : new SubtreeReader<>(reader, handledChildren);
-    }
-
-    static class SubtreeListReader<D extends DataObject & Identifiable<K>, B extends Builder<D>, K extends Identifier<D>>
-            extends SubtreeReader<D, B> implements ListReader<D, K, B> {
-
-        final ListReader<D, K, B> delegate;
-
-        SubtreeListReader(final ListReader<D, K, B> delegate,
-                                  final Set<InstanceIdentifier<?>> handledTypes) {
-            super(delegate, handledTypes);
-            this.delegate = delegate;
-        }
-
-        @Nonnull
-        @Override
-        public List<D> readList(@Nonnull final InstanceIdentifier<D> id, @Nonnull final ReadContext ctx)
-                throws ReadFailedException {
-            return delegate.readList(id, ctx);
-        }
-
-        @Override
-        public void merge(@Nonnull final Builder<? extends DataObject> builder, @Nonnull final List<D> readData) {
-            delegate.merge(builder, readData);
-        }
-
-        @Override
-        public List<K> getAllIds(@Nonnull final InstanceIdentifier<D> id,
-                                 @Nonnull final ReadContext ctx) throws ReadFailedException {
-            return delegate.getAllIds(id, ctx);
-        }
-    }
-
-}
diff --git a/infra/translate-utils/src/main/java/io/fd/honeycomb/translate/util/read/registry/TypeHierarchy.java b/infra/translate-utils/src/main/java/io/fd/honeycomb/translate/util/read/registry/TypeHierarchy.java
deleted file mode 100644
index a30663221..000000000
--- a/infra/translate-utils/src/main/java/io/fd/honeycomb/translate/util/read/registry/TypeHierarchy.java
+++ /dev/null
@@ -1,101 +0,0 @@
-/*
- * Copyright (c) 2016 Cisco and/or its affiliates.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at:
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package io.fd.honeycomb.translate.util.read.registry;
-
-import static com.google.common.base.Preconditions.checkArgument;
-
-import com.google.common.collect.Iterables;
-import java.util.HashSet;
-import java.util.LinkedList;
-import java.util.List;
-import java.util.Set;
-import java.util.stream.Collectors;
-import javax.annotation.Nonnull;
-import org.jgrapht.experimental.dag.DirectedAcyclicGraph;
-import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
-
-final class TypeHierarchy {
-    private final DirectedAcyclicGraph<InstanceIdentifier<?>, Parent> hierarchy;
-
-    private TypeHierarchy(@Nonnull final DirectedAcyclicGraph<InstanceIdentifier<?>, Parent> hierarchy) {
-        this.hierarchy = hierarchy;
-    }
-
-    Set<InstanceIdentifier<?>> getAllChildren(InstanceIdentifier<?> id) {
-        final HashSet<InstanceIdentifier<?>> instanceIdentifiers = new HashSet<>();
-        for (InstanceIdentifier<?> childId : getDirectChildren(id)) {
-            instanceIdentifiers.add(childId);
-            instanceIdentifiers.addAll(getAllChildren(childId));
-        }
-        return instanceIdentifiers;
-    }
-
-    Set<InstanceIdentifier<?>> getDirectChildren(InstanceIdentifier<?> id) {
-        checkArgument(hierarchy.vertexSet().contains(id),
-                "Unknown reader: %s. Known readers: %s", id, hierarchy.vertexSet());
-
-        return hierarchy.outgoingEdgesOf(id).stream()
-                .map(hierarchy::getEdgeTarget)
-                .collect(Collectors.toSet());
-    }
-
-    Set<InstanceIdentifier<?>> getRoots() {
-        return hierarchy.vertexSet().stream()
-                .filter(vertex -> hierarchy.incomingEdgesOf(vertex).size() == 0)
-                .collect(Collectors.toSet());
-    }
-
-    /**
-     * Create reader hierarchy from a flat set of instance identifiers.
-     *
-     * @param allIds Set of unkeyed instance identifiers
-     */
-    static TypeHierarchy create(@Nonnull Set<InstanceIdentifier<?>> allIds) {
-        final DirectedAcyclicGraph<InstanceIdentifier<?>, Parent>
-                readersHierarchy = new DirectedAcyclicGraph<>((sourceVertex, targetVertex) -> new Parent());
-
-        for (InstanceIdentifier<?> allId : allIds) {
-            checkArgument(!Iterables.isEmpty(allId.getPathArguments()), "Empty ID detected");
-
-            if (Iterables.size(allId.getPathArguments()) == 1) {
-                readersHierarchy.addVertex(allId);
-            }
-
-            List<InstanceIdentifier.PathArgument> pathArgs = new LinkedList<>();
-            pathArgs.add(allId.getPathArguments().iterator().next());
-
-            for (InstanceIdentifier.PathArgument pathArgument : Iterables.skip(allId.getPathArguments(), 1)) {
-                final InstanceIdentifier<?> previous = InstanceIdentifier.create(pathArgs);
-                pathArgs.add(pathArgument);
-                final InstanceIdentifier<?> current = InstanceIdentifier.create(pathArgs);
-
-                readersHierarchy.addVertex(previous);
-                readersHierarchy.addVertex(current);
-
-                try {
-                    readersHierarchy.addDagEdge(previous, current);
-                } catch (DirectedAcyclicGraph.CycleFoundException e) {
-                    throw new IllegalArgumentException("Loop in hierarchy detected", e);
-                }
-            }
-        }
-
-        return new TypeHierarchy(readersHierarchy);
-    }
-
-    private static final class Parent{}
-}
diff --git a/infra/translate-utils/src/main/java/io/fd/honeycomb/translate/util/write/registry/FlatWriterRegistry.java b/infra/translate-utils/src/main/java/io/fd/honeycomb/translate/util/write/registry/FlatWriterRegistry.java
deleted file mode 100644
index e5b829d6a..000000000
--- a/infra/translate-utils/src/main/java/io/fd/honeycomb/translate/util/write/registry/FlatWriterRegistry.java
+++ /dev/null
@@ -1,314 +0,0 @@
-/*
- * Copyright (c) 2016 Cisco and/or its affiliates.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at:
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package io.fd.honeycomb.translate.util.write.registry;
-
-import static com.google.common.base.Preconditions.checkArgument;
-import static com.google.common.base.Preconditions.checkNotNull;
-import static io.fd.honeycomb.translate.util.RWUtils.makeIidWildcarded;
-
-import com.google.common.base.Optional;
-import com.google.common.collect.HashMultimap;
-import com.google.common.collect.ImmutableMap;
-import com.google.common.collect.ImmutableSet;
-import com.google.common.collect.Lists;
-import com.google.common.collect.Multimap;
-import com.google.common.collect.Sets;
-import io.fd.honeycomb.translate.TranslationException;
-import io.fd.honeycomb.translate.util.RWUtils;
-import io.fd.honeycomb.translate.write.DataObjectUpdate;
-import io.fd.honeycomb.translate.write.WriteContext;
-import io.fd.honeycomb.translate.write.WriteFailedException;
-import io.fd.honeycomb.translate.write.Writer;
-import io.fd.honeycomb.translate.write.registry.WriterRegistry;
-import java.util.Collection;
-import java.util.Collections;
-import java.util.HashSet;
-import java.util.Map;
-import java.util.Set;
-import java.util.stream.Collectors;
-import javax.annotation.Nonnull;
-import javax.annotation.Nullable;
-import javax.annotation.concurrent.ThreadSafe;
-import org.opendaylight.yangtools.yang.binding.DataObject;
-import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
-/**
- * Flat writer registry, delegating updates to writers in the order writers were submitted.
- */
-@ThreadSafe
-final class FlatWriterRegistry implements WriterRegistry {
-
-    private static final Logger LOG = LoggerFactory.getLogger(FlatWriterRegistry.class);
-
-    // All types handled by writers directly or as children
-    private final ImmutableSet<InstanceIdentifier<?>> handledTypes;
-
-    private final Set<InstanceIdentifier<?>> writersOrderReversed;
-    private final Set<InstanceIdentifier<?>> writersOrder;
-    private final Map<InstanceIdentifier<?>, Writer<?>> writers;
-
-    /**
-     * Create flat registry instance.
-     *
-     * @param writers immutable, ordered map of writers to use to process updates. Order of the writers has to be
-     *                one in which create and update operations should be handled. Deletes will be handled in reversed
-     *                order. All deletes are handled before handling all the updates.
-     */
-    FlatWriterRegistry(@Nonnull final ImmutableMap<InstanceIdentifier<?>, Writer<?>> writers) {
-        this.writers = writers;
-        this.writersOrderReversed = Sets.newLinkedHashSet(Lists.reverse(Lists.newArrayList(writers.keySet())));
-        this.writersOrder = writers.keySet();
-        this.handledTypes = getAllHandledTypes(writers);
-    }
-
-    private static ImmutableSet<InstanceIdentifier<?>> getAllHandledTypes(
-            @Nonnull final ImmutableMap<InstanceIdentifier<?>, Writer<?>> writers) {
-        final ImmutableSet.Builder<InstanceIdentifier<?>> handledTypesBuilder = ImmutableSet.builder();
-        for (Map.Entry<InstanceIdentifier<?>, Writer<?>> writerEntry : writers.entrySet()) {
-            final InstanceIdentifier<?> writerType = writerEntry.getKey();
-            final Writer<?> writer = writerEntry.getValue();
-            handledTypesBuilder.add(writerType);
-            if (writer instanceof SubtreeWriter) {
-                handledTypesBuilder.addAll(((SubtreeWriter<?>) writer).getHandledChildTypes());
-            }
-        }
-        return handledTypesBuilder.build();
-    }
-
-    @Override
-    public void update(@Nonnull final DataObjectUpdates updates,
-                       @Nonnull final WriteContext ctx) throws TranslationException {
-        if (updates.isEmpty()) {
-            return;
-        }
-
-        // Optimization
-        if (updates.containsOnlySingleType()) {
-            // First process delete
-            singleUpdate(updates.getDeletes(), ctx);
-            // Next is update
-            singleUpdate(updates.getUpdates(), ctx);
-        } else {
-            // First process deletes
-            bulkUpdate(updates.getDeletes(), ctx, true, writersOrderReversed);
-            // Next are updates
-            bulkUpdate(updates.getUpdates(), ctx, true, writersOrder);
-        }
-
-        LOG.debug("Update successful for types: {}", updates.getTypeIntersection());
-        LOG.trace("Update successful for: {}", updates);
-    }
-
-    private void singleUpdate(@Nonnull final Multimap<InstanceIdentifier<?>, ? extends DataObjectUpdate> updates,
-                              @Nonnull final WriteContext ctx) throws WriteFailedException {
-        if (updates.isEmpty()) {
-            return;
-        }
-
-        final InstanceIdentifier<?> singleType = updates.keySet().iterator().next();
-        LOG.debug("Performing single type update for: {}", singleType);
-        Collection<? extends DataObjectUpdate> singleTypeUpdates = updates.get(singleType);
-        Writer<?> writer = getWriter(singleType);
-
-        if (writer == null) {
-            // This node must be handled by a subtree writer, find it and call it or else fail
-            checkArgument(handledTypes.contains(singleType), "Unable to process update. Missing writers for: %s",
-                    singleType);
-            writer = getSubtreeWriterResponsible(singleType);
-            singleTypeUpdates = getParentDataObjectUpdate(ctx, updates, writer);
-        }
-
-        LOG.trace("Performing single type update with writer: {}", writer);
-        for (DataObjectUpdate singleUpdate : singleTypeUpdates) {
-            writer.update(singleUpdate.getId(), singleUpdate.getDataBefore(), singleUpdate.getDataAfter(), ctx);
-        }
-    }
-
-    private Writer<?> getSubtreeWriterResponsible(final InstanceIdentifier<?> singleType) {
-        return writers.values().stream()
-                .filter(w -> w instanceof SubtreeWriter)
-                .filter(w -> ((SubtreeWriter<?>) w).getHandledChildTypes().contains(singleType))
-                .findFirst()
-                .get();
-    }
-
-    private Collection<DataObjectUpdate> getParentDataObjectUpdate(final WriteContext ctx,
-                                                                   final Multimap<InstanceIdentifier<?>, ? extends DataObjectUpdate> updates,
-                                                                   final Writer<?> writer) {
-        // Now read data for subtree reader root, but first keyed ID is needed and that ID can be cut from updates
-        InstanceIdentifier<?> firstAffectedChildId = ((SubtreeWriter<?>) writer).getHandledChildTypes().stream()
-                .filter(updates::containsKey)
-                .map(unkeyedId -> updates.get(unkeyedId))
-                .flatMap(doUpdates -> doUpdates.stream())
-                .map(DataObjectUpdate::getId)
-                .findFirst()
-                .get();
-
-        final InstanceIdentifier<?> parentKeyedId =
-                RWUtils.cutId(firstAffectedChildId, writer.getManagedDataObjectType());
-
-        final Optional<? extends DataObject> parentBefore = ctx.readBefore(parentKeyedId);
-        final Optional<? extends DataObject> parentAfter = ctx.readAfter(parentKeyedId);
-        return Collections.singleton(
-                DataObjectUpdate.create(parentKeyedId, parentBefore.orNull(), parentAfter.orNull()));
-    }
-
-    private void bulkUpdate(@Nonnull final Multimap<InstanceIdentifier<?>, ? extends DataObjectUpdate> updates,
-                            @Nonnull final WriteContext ctx,
-                            final boolean attemptRevert,
-                            @Nonnull final Set<InstanceIdentifier<?>> writersOrder) throws BulkUpdateException {
-        if (updates.isEmpty()) {
-            return;
-        }
-
-        LOG.debug("Performing bulk update with revert attempt: {} for: {}", attemptRevert, updates.keySet());
-
-        // Check that all updates can be handled
-        checkAllTypesCanBeHandled(updates);
-
-        // Capture all changes successfully processed in case revert is needed
-        final Set<InstanceIdentifier<?>> processedNodes = new HashSet<>();
-
-        // Iterate over all writers and call update if there are any related updates
-        for (InstanceIdentifier<?> writerType : writersOrder) {
-            Collection<? extends DataObjectUpdate> writersData = updates.get(writerType);
-            final Writer<?> writer = getWriter(writerType);
-
-            if (writersData.isEmpty()) {
-                // If there are no data for current writer, but it is a SubtreeWriter and there are updates to
-                // its children, still invoke it with its root data
-                if (writer instanceof SubtreeWriter<?> && isAffected(((SubtreeWriter<?>) writer), updates)) {
-                    // Provide parent data for SubtreeWriter for further processing
-                    writersData = getParentDataObjectUpdate(ctx, updates, writer);
-                } else {
-                    // Skipping unaffected writer
-                    // Alternative to this would be modification sort according to the order of writers
-                    continue;
-                }
-            }
-
-            LOG.debug("Performing update for: {}",  writerType);
-            LOG.trace("Performing update with writer: {}", writer);
-
-            for (DataObjectUpdate singleUpdate : writersData) {
-                try {
-                    writer.update(singleUpdate.getId(), singleUpdate.getDataBefore(), singleUpdate.getDataAfter(), ctx);
-                    processedNodes.add(singleUpdate.getId());
-                    LOG.trace("Update successful for type: {}", writerType);
-                    LOG.debug("Update successful for: {}", singleUpdate);
-                } catch (Exception e) {
-                    // do not log this exception here,its logged in ModifiableDataTreeDelegator
-
-                    final Reverter reverter = attemptRevert
-                            ? new ReverterImpl(processedNodes, updates, writersOrder)
-                            : (final WriteContext writeContext) -> {};//NOOP reverter
-
-                    // Find out which changes left unprocessed
-                    final Set<InstanceIdentifier<?>> unprocessedChanges = updates.values().stream()
-                            .map(DataObjectUpdate::getId)
-                            .filter(id -> !processedNodes.contains(id))
-                            .collect(Collectors.toSet());
-                    throw new BulkUpdateException(unprocessedChanges, reverter, e);
-                }
-            }
-        }
-    }
-
-    private void checkAllTypesCanBeHandled(
-            @Nonnull final Multimap<InstanceIdentifier<?>, ? extends DataObjectUpdate> updates) {
-        if (!handledTypes.containsAll(updates.keySet())) {
-            final Sets.SetView<InstanceIdentifier<?>> missingWriters = Sets.difference(updates.keySet(), handledTypes);
-            LOG.warn("Unable to process update. Missing writers for: {}", missingWriters);
-            throw new IllegalArgumentException("Unable to process update. Missing writers for: " + missingWriters);
-        }
-    }
-
-    /**
-     * Check whether {@link SubtreeWriter} is affected by the updates.
-     *
-     * @return true if there are any updates to SubtreeWriter's child nodes (those marked by SubtreeWriter
-     *         as being taken care of)
-     * */
-    private static boolean isAffected(final SubtreeWriter<?> writer,
-                               final Multimap<InstanceIdentifier<?>, ? extends DataObjectUpdate> updates) {
-        return !Sets.intersection(writer.getHandledChildTypes(), updates.keySet()).isEmpty();
-    }
-
-    @Nullable
-    private Writer<?> getWriter(@Nonnull final InstanceIdentifier<?> singleType) {
-        return writers.get(singleType);
-    }
-
-    private final class ReverterImpl implements Reverter {
-
-        private final Collection<InstanceIdentifier<?>> processedNodes;
-        private final Multimap<InstanceIdentifier<?>, ? extends DataObjectUpdate> updates;
-        private final Set<InstanceIdentifier<?>> revertDeleteOrder;
-
-        ReverterImpl(final Collection<InstanceIdentifier<?>> processedNodes,
-                     final Multimap<InstanceIdentifier<?>, ? extends DataObjectUpdate> updates,
-                     final Set<InstanceIdentifier<?>> writersOrderOriginal) {
-            this.processedNodes = processedNodes;
-            this.updates = updates;
-            // Use opposite ordering when executing revert
-            this.revertDeleteOrder =  writersOrderOriginal == FlatWriterRegistry.this.writersOrder
-                    ? FlatWriterRegistry.this.writersOrderReversed
-                    : FlatWriterRegistry.this.writersOrder;
-        }
-
-        @Override
-        public void revert(@Nonnull final WriteContext writeContext) throws RevertFailedException {
-            checkNotNull(writeContext, "Cannot revert changes for null context");
-
-            Multimap<InstanceIdentifier<?>, DataObjectUpdate> updatesToRevert =
-                    filterAndRevertProcessed(updates, processedNodes);
-
-            LOG.info("Attempting revert for changes: {}", updatesToRevert);
-            try {
-                // Perform reversed bulk update without revert attempt
-                bulkUpdate(updatesToRevert, writeContext, true, revertDeleteOrder);
-                LOG.info("Revert successful");
-            } catch (BulkUpdateException e) {
-                LOG.error("Revert failed", e);
-                throw new RevertFailedException(e.getFailedIds(), e);
-            }
-        }
-
-        /**
-         * Create new updates map, but only keep already processed changes. Switching before and after data for each
-         * update.
-         */
-        private Multimap<InstanceIdentifier<?>, DataObjectUpdate> filterAndRevertProcessed(
-                final Multimap<InstanceIdentifier<?>, ? extends DataObjectUpdate> updates,
-                final Collection<InstanceIdentifier<?>> processedNodes) {
-            final Multimap<InstanceIdentifier<?>, DataObjectUpdate> filtered = HashMultimap.create();
-            for (InstanceIdentifier<?> processedNode : processedNodes) {
-                final InstanceIdentifier<?> wildcardedIid = makeIidWildcarded(processedNode);
-                if (updates.containsKey(wildcardedIid)) {
-                    updates.get(wildcardedIid).stream()
-                            .filter(dataObjectUpdate -> processedNode.contains(dataObjectUpdate.getId()))
-                            // putting under unkeyed identifier, to prevent failing of checkAllTypesCanBeHandled
-                            .forEach(dataObjectUpdate -> filtered.put(wildcardedIid, dataObjectUpdate.reverse()));
-                }
-            }
-            return filtered;
-        }
-    }
-
-}
diff --git a/infra/translate-utils/src/main/java/io/fd/honeycomb/translate/util/write/registry/FlatWriterRegistryBuilder.java b/infra/translate-utils/src/main/java/io/fd/honeycomb/translate/util/write/registry/FlatWriterRegistryBuilder.java
deleted file mode 100644
index 0f75de7e7..000000000
--- a/infra/translate-utils/src/main/java/io/fd/honeycomb/translate/util/write/registry/FlatWriterRegistryBuilder.java
+++ /dev/null
@@ -1,71 +0,0 @@
-/*
- * Copyright (c) 2016 Cisco and/or its affiliates.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at:
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package io.fd.honeycomb.translate.util.write.registry;
-
-import com.google.common.annotations.VisibleForTesting;
-import com.google.common.collect.ImmutableMap;
-import io.fd.honeycomb.translate.write.registry.WriterRegistryBuilder;
-import io.fd.honeycomb.translate.util.AbstractSubtreeManagerRegistryBuilderBuilder;
-import io.fd.honeycomb.translate.write.Writer;
-import io.fd.honeycomb.translate.write.registry.ModifiableWriterRegistryBuilder;
-import io.fd.honeycomb.translate.write.registry.WriterRegistry;
-import java.util.Set;
-import java.util.stream.Collectors;
-import javax.annotation.Nonnull;
-import javax.annotation.concurrent.NotThreadSafe;
-import org.opendaylight.yangtools.yang.binding.DataObject;
-import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
-/**
- * Builder for {@link FlatWriterRegistry} allowing users to specify inter-writer relationships.
- */
-@NotThreadSafe
-public final class FlatWriterRegistryBuilder
-        extends AbstractSubtreeManagerRegistryBuilderBuilder<Writer<? extends DataObject>, WriterRegistry>
-        implements ModifiableWriterRegistryBuilder, WriterRegistryBuilder {
-
-    private static final Logger LOG = LoggerFactory.getLogger(FlatWriterRegistryBuilder.class);
-
-    @Override
-    protected Writer<? extends DataObject> getSubtreeHandler(final @Nonnull Set<InstanceIdentifier<?>> handledChildren,
-                                                             final @Nonnull Writer<? extends DataObject> writer) {
-        return SubtreeWriter.createForWriter(handledChildren, writer);
-    }
-
-    /**
-     * Create FlatWriterRegistry with writers ordered according to submitted relationships.
-     */
-    @Override
-    public WriterRegistry build() {
-        final ImmutableMap<InstanceIdentifier<?>, Writer<?>> mappedWriters = getMappedHandlers();
-        LOG.debug("Building writer registry with writers: {}",
-                mappedWriters.keySet().stream()
-                        .map(InstanceIdentifier::getTargetType)
-                        .map(Class::getSimpleName)
-                        .collect(Collectors.joining(", ")));
-        LOG.trace("Building writer registry with writers: {}", mappedWriters);
-        return new FlatWriterRegistry(mappedWriters);
-    }
-
-    @VisibleForTesting
-    @Override
-    protected ImmutableMap<InstanceIdentifier<?>, Writer<? extends DataObject>> getMappedHandlers() {
-        return super.getMappedHandlers();
-    }
-}
diff --git a/infra/translate-utils/src/main/java/io/fd/honeycomb/translate/util/write/registry/SubtreeWriter.java b/infra/translate-utils/src/main/java/io/fd/honeycomb/translate/util/write/registry/SubtreeWriter.java
deleted file mode 100644
index bab1da16f..000000000
--- a/infra/translate-utils/src/main/java/io/fd/honeycomb/translate/util/write/registry/SubtreeWriter.java
+++ /dev/null
@@ -1,85 +0,0 @@
-/*
- * Copyright (c) 2016 Cisco and/or its affiliates.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at:
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package io.fd.honeycomb.translate.util.write.registry;
-
-import static com.google.common.base.Preconditions.checkArgument;
-
-import com.google.common.collect.Iterables;
-import io.fd.honeycomb.translate.write.WriteContext;
-import io.fd.honeycomb.translate.write.WriteFailedException;
-import io.fd.honeycomb.translate.write.Writer;
-import java.util.HashSet;
-import java.util.Set;
-import javax.annotation.Nonnull;
-import javax.annotation.Nullable;
-import org.opendaylight.yangtools.yang.binding.DataObject;
-import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
-
-/**
- * Simple writer delegate for subtree writers (writers handling also children nodes) providing a list of all the
- * children nodes being handled.
- */
-final class SubtreeWriter<D extends DataObject> implements Writer<D> {
-
-    private final Writer<D> delegate;
-    private final Set<InstanceIdentifier<?>> handledChildTypes = new HashSet<>();
-
-    private SubtreeWriter(final Writer<D> delegate, Set<InstanceIdentifier<?>> handledTypes) {
-        this.delegate = delegate;
-        for (InstanceIdentifier<?> handledType : handledTypes) {
-            // Iid has to start with writer's handled root type
-            checkArgument(delegate.getManagedDataObjectType().getTargetType().equals(
-                    handledType.getPathArguments().iterator().next().getType()),
-                    "Handled node from subtree has to be identified by an instance identifier starting from: %s."
-                    + "Instance identifier was: %s", getManagedDataObjectType().getTargetType(), handledType);
-            checkArgument(Iterables.size(handledType.getPathArguments()) > 1,
-                    "Handled node from subtree identifier too short: %s", handledType);
-            handledChildTypes.add(InstanceIdentifier.create(Iterables.concat(
-                    getManagedDataObjectType().getPathArguments(), Iterables.skip(handledType.getPathArguments(), 1))));
-        }
-    }
-
-    /**
-     * Return set of types also handled by this writer. All of the types are children of the type managed by this
-     * writer excluding the type of this writer.
-     */
-    Set<InstanceIdentifier<?>> getHandledChildTypes() {
-        return handledChildTypes;
-    }
-
-    @Override
-    public void update(
-            @Nonnull final InstanceIdentifier<? extends DataObject> id,
-            @Nullable final DataObject dataBefore,
-            @Nullable final DataObject dataAfter, @Nonnull final WriteContext ctx) throws WriteFailedException {
-        delegate.update(id, dataBefore, dataAfter, ctx);
-    }
-
-    @Override
-    @Nonnull
-    public InstanceIdentifier<D> getManagedDataObjectType() {
-        return delegate.getManagedDataObjectType();
-    }
-
-    /**
-     * Wrap a writer as a subtree writer.
-     */
-    static Writer<?> createForWriter(@Nonnull final Set<InstanceIdentifier<?>> handledChildren,
-                                     @Nonnull final Writer<? extends DataObject> writer) {
-        return new SubtreeWriter<>(writer, handledChildren);
-    }
-}