HONEYCOMB-9: Remove references to VPP from translation layer

Change-Id: I281db366a112edc08203e8cb392a212708d4552a
Signed-off-by: Maros Marsalek <mmarsale@cisco.com>

8 files changed, 1190 insertions, 0 deletions

diff --git a/v3po/translate-impl/src/main/java/io/fd/honeycomb/v3po/translate/impl/read/AbstractCompositeReader.java b/v3po/translate-impl/src/main/java/io/fd/honeycomb/v3po/translate/impl/read/AbstractCompositeReader.java
new file mode 100644
index 000000000..f9fa0eeaa
--- /dev/null
+++ b/v3po/translate-impl/src/main/java/io/fd/honeycomb/v3po/translate/impl/read/AbstractCompositeReader.java
@@ -0,0 +1,232 @@
+/*
+ * 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.v3po.translate.impl.read;
+
+import static com.google.common.base.Preconditions.checkArgument;
+
+import com.google.common.annotations.Beta;
+import com.google.common.base.Optional;
+import com.google.common.base.Predicate;
+import com.google.common.collect.Iterables;
+import io.fd.honeycomb.v3po.translate.util.ReflectionUtils;
+import io.fd.honeycomb.v3po.translate.util.RWUtils;
+import io.fd.honeycomb.v3po.translate.read.ChildReader;
+import io.fd.honeycomb.v3po.translate.read.ReadContext;
+import io.fd.honeycomb.v3po.translate.read.ReadFailedException;
+import io.fd.honeycomb.v3po.translate.read.Reader;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+import java.util.Collections;
+import java.util.List;
+import java.util.Map;
+import javax.annotation.Nonnull;
+import javax.annotation.Nullable;
+import org.opendaylight.yangtools.concepts.Builder;
+import org.opendaylight.yangtools.yang.binding.Augmentation;
+import org.opendaylight.yangtools.yang.binding.ChildOf;
+import org.opendaylight.yangtools.yang.binding.DataObject;
+import org.opendaylight.yangtools.yang.binding.Identifier;
+import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+@Beta
+abstract class AbstractCompositeReader<D extends DataObject, B extends Builder<D>> implements Reader<D> {
+
+    private static final Logger LOG = LoggerFactory.getLogger(AbstractCompositeReader.class);
+
+    private final Map<Class<? extends DataObject>, ChildReader<? extends ChildOf<D>>> childReaders;
+    private final Map<Class<? extends DataObject>, ChildReader<? extends Augmentation<D>>> augReaders;
+    private final InstanceIdentifier<D> instanceIdentifier;
+
+    AbstractCompositeReader(final Class<D> managedDataObjectType,
+                            final List<ChildReader<? extends ChildOf<D>>> childReaders,
+                            final List<ChildReader<? extends Augmentation<D>>> augReaders) {
+        this.childReaders = RWUtils.uniqueLinkedIndex(childReaders, RWUtils.MANAGER_CLASS_FUNCTION);
+        this.augReaders = RWUtils.uniqueLinkedIndex(augReaders, RWUtils.MANAGER_CLASS_AUG_FUNCTION);
+        this.instanceIdentifier = InstanceIdentifier.create(managedDataObjectType);
+    }
+
+    @Nonnull
+    @Override
+    public final InstanceIdentifier<D> getManagedDataObjectType() {
+        return instanceIdentifier;
+    }
+
+    /**
+     * @param id {@link InstanceIdentifier} pointing to current node. In case of keyed list, key must be present.
+     *
+     */
+    protected Optional<D> readCurrent(final InstanceIdentifier<D> id,
+                                      @Nonnull final ReadContext ctx) throws ReadFailedException {
+        LOG.debug("{}: Reading current: {}", this, id);
+        final B builder = getBuilder(id);
+        // Cache empty value to determine if anything has changed later TODO cache in a field
+        final D emptyValue = builder.build();
+
+        LOG.trace("{}: Reading current attributes", this);
+        readCurrentAttributes(id, builder, ctx);
+
+        // TODO expect exceptions from reader
+        for (ChildReader<? extends ChildOf<D>> child : childReaders.values()) {
+            LOG.debug("{}: Reading child from: {}", this, child);
+            child.read(id, builder, ctx);
+        }
+
+        for (ChildReader<? extends Augmentation<D>> child : augReaders.values()) {
+            LOG.debug("{}: Reading augment from: {}", this, child);
+            child.read(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.<D>absent()
+            : Optional.of(built);
+
+        LOG.debug("{}: Current node read successfully. Result: {}", this, read);
+        return read;
+    }
+
+    @Nonnull
+    @Override
+    @SuppressWarnings("unchecked")
+    public Optional<? extends DataObject> read(@Nonnull final InstanceIdentifier<? extends DataObject> id,
+                                               @Nonnull final ReadContext ctx)
+            throws ReadFailedException {
+        LOG.trace("{}: Reading : {}", this, id);
+        if (id.getTargetType().equals(getManagedDataObjectType().getTargetType())) {
+            return readCurrent((InstanceIdentifier<D>) id, ctx);
+        } else {
+            return readSubtree(id, ctx);
+        }
+    }
+
+    private Optional<? extends DataObject> readSubtree(final InstanceIdentifier<? extends DataObject> id,
+                                                       @Nonnull final ReadContext ctx)
+            throws ReadFailedException {
+        LOG.debug("{}: Reading subtree: {}", this, id);
+        final Class<? extends DataObject> next = RWUtils.getNextId(id, getManagedDataObjectType()).getType();
+        final ChildReader<? extends ChildOf<D>> reader = childReaders.get(next);
+
+        if (reader != null) {
+            LOG.debug("{}: Reading subtree: {} from: {}", this, id, reader);
+            return reader.read(id, ctx);
+        } else {
+            LOG.debug("{}: Dedicated subtree reader missing for: {}. Reading current and filtering", this, next);
+            // If there's no dedicated reader, use read current
+            final InstanceIdentifier<D> currentId = RWUtils.cutId(id, getManagedDataObjectType());
+            final Optional<D> current = readCurrent(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;
+        }
+    }
+
+    /**
+     * Fill in current node's attributes
+     *
+     * @param id {@link InstanceIdentifier} pointing to current node. In case of keyed list, key must be present.
+     * @param builder Builder object for current node where the read attributes must be placed
+     * @param ctx Current read context
+     */
+    protected abstract void readCurrentAttributes(@Nonnull final InstanceIdentifier<D> id, @Nonnull final B builder,
+                                                  @Nonnull final ReadContext ctx) throws ReadFailedException;
+
+    /**
+     * Return new instance of a builder object for current node
+     *
+     * @param id {@link InstanceIdentifier} pointing to current node. In case of keyed list, key must be present.
+     * @return Builder object for current node type
+     */
+    protected abstract B getBuilder(InstanceIdentifier<D> id);
+
+    // TODO move filtering out of here into a dedicated Filter ifc
+    @Nonnull
+    private static Optional<? extends DataObject> filterSubtree(@Nonnull final DataObject parent,
+                                                            @Nonnull final InstanceIdentifier<? extends DataObject> absolutPath,
+                                                            @Nonnull final Class<?> managedType) {
+        // TODO is there a better way than reflection ? e.g. convert into NN and filter out with a utility
+        // FIXME this needs to be recursive. right now it expects only 1 additional element in ID + test
+
+        final InstanceIdentifier.PathArgument nextId =
+            RWUtils.getNextId(absolutPath, InstanceIdentifier.create(parent.getClass()));
+
+        Optional<Method> method = ReflectionUtils.findMethodReflex(managedType, "get",
+            Collections.<Class<?>>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.<Class<?>>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();
+        return Iterables.tryFind(invoke, new Predicate<DataObject>() {
+            @Override
+            public boolean apply(@Nullable final DataObject input) {
+                final Optional<Method> keyGetter =
+                    ReflectionUtils.findMethodReflex(nextId.getType(), "get",
+                        Collections.<Class<?>>emptyList(), key.getClass());
+                final Object actualKey;
+                actualKey = invoke(keyGetter.get(), nextId, input);
+                return key.equals(actualKey);
+            }
+        });
+    }
+
+    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
+    public String toString() {
+        return String.format("Reader[%s]", getManagedDataObjectType().getTargetType().getSimpleName());
+    }
+}
diff --git a/v3po/translate-impl/src/main/java/io/fd/honeycomb/v3po/translate/impl/read/CompositeChildReader.java b/v3po/translate-impl/src/main/java/io/fd/honeycomb/v3po/translate/impl/read/CompositeChildReader.java
new file mode 100644
index 000000000..46a59bb90
--- /dev/null
+++ b/v3po/translate-impl/src/main/java/io/fd/honeycomb/v3po/translate/impl/read/CompositeChildReader.java
@@ -0,0 +1,104 @@
+/*
+ * 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.v3po.translate.impl.read;
+
+import com.google.common.annotations.Beta;
+import com.google.common.base.Optional;
+import io.fd.honeycomb.v3po.translate.read.ReadContext;
+import io.fd.honeycomb.v3po.translate.read.ReadFailedException;
+import io.fd.honeycomb.v3po.translate.util.RWUtils;
+import io.fd.honeycomb.v3po.translate.read.ChildReader;
+import io.fd.honeycomb.v3po.translate.spi.read.ChildReaderCustomizer;
+import java.util.List;
+import javax.annotation.Nonnull;
+import javax.annotation.concurrent.ThreadSafe;
+import org.opendaylight.yangtools.concepts.Builder;
+import org.opendaylight.yangtools.yang.binding.Augmentation;
+import org.opendaylight.yangtools.yang.binding.ChildOf;
+import org.opendaylight.yangtools.yang.binding.DataObject;
+import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
+
+/**
+ * Composite implementation of {@link ChildReader} able to place the read result into
+ * parent builder object.
+ */
+@Beta
+@ThreadSafe
+public final class CompositeChildReader<C extends DataObject, B extends Builder<C>> extends AbstractCompositeReader<C, B>
+    implements ChildReader<C> {
+
+    private final ChildReaderCustomizer<C, B> customizer;
+
+    /**
+     * Create new {@link CompositeChildReader}
+     *
+     * @param managedDataObjectType Class object for managed data type
+     * @param childReaders Child nodes(container, list) readers
+     * @param augReaders Child augmentations readers
+     * @param customizer Customizer instance to customize this generic reader
+     *
+     */
+    public CompositeChildReader(@Nonnull final Class<C> managedDataObjectType,
+                                @Nonnull final List<ChildReader<? extends ChildOf<C>>> childReaders,
+                                @Nonnull final List<ChildReader<? extends Augmentation<C>>> augReaders,
+                                @Nonnull final ChildReaderCustomizer<C, B> customizer) {
+        super(managedDataObjectType, childReaders, augReaders);
+        this.customizer = customizer;
+    }
+
+    /**
+     * @see {@link CompositeChildReader#CompositeChildReader(Class, List, List, ChildReaderCustomizer)}
+     */
+    public CompositeChildReader(@Nonnull final Class<C> managedDataObjectType,
+                                @Nonnull final List<ChildReader<? extends ChildOf<C>>> childReaders,
+                                @Nonnull final ChildReaderCustomizer<C, B> customizer) {
+        this(managedDataObjectType, childReaders, RWUtils.<C>emptyAugReaderList(), customizer);
+    }
+
+    /**
+     * @see {@link CompositeChildReader#CompositeChildReader(Class, List, List, ChildReaderCustomizer)}
+     */
+    public CompositeChildReader(@Nonnull final Class<C> managedDataObjectType,
+                                @Nonnull final ChildReaderCustomizer<C, B> customizer) {
+        this(managedDataObjectType, RWUtils.<C>emptyChildReaderList(), RWUtils.<C>emptyAugReaderList(),
+            customizer);
+    }
+
+    @Override
+    public final void read(@Nonnull final InstanceIdentifier<? extends DataObject> parentId,
+                           @Nonnull final Builder<? extends DataObject> parentBuilder,
+                           @Nonnull final ReadContext ctx) throws ReadFailedException {
+        final Optional<C> read = readCurrent(RWUtils.appendTypeToId(parentId, getManagedDataObjectType()), ctx);
+
+        if(read.isPresent()) {
+            customizer.merge(parentBuilder, read.get());
+        }
+    }
+
+    @Override
+    protected void readCurrentAttributes(@Nonnull final InstanceIdentifier<C> id, @Nonnull final B builder,
+                                         @Nonnull final ReadContext ctx)
+            throws ReadFailedException {
+        customizer.readCurrentAttributes(id, builder, ctx.getContext());
+    }
+
+    @Override
+    protected B getBuilder(@Nonnull final InstanceIdentifier<C> id) {
+        return customizer.getBuilder(id);
+    }
+
+}
diff --git a/v3po/translate-impl/src/main/java/io/fd/honeycomb/v3po/translate/impl/read/CompositeListReader.java b/v3po/translate-impl/src/main/java/io/fd/honeycomb/v3po/translate/impl/read/CompositeListReader.java
new file mode 100644
index 000000000..fd7b279ca
--- /dev/null
+++ b/v3po/translate-impl/src/main/java/io/fd/honeycomb/v3po/translate/impl/read/CompositeListReader.java
@@ -0,0 +1,137 @@
+/*
+ * 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.v3po.translate.impl.read;
+
+import static com.google.common.base.Preconditions.checkArgument;
+
+import com.google.common.annotations.Beta;
+import com.google.common.base.Optional;
+import io.fd.honeycomb.v3po.translate.read.ReadFailedException;
+import io.fd.honeycomb.v3po.translate.util.RWUtils;
+import io.fd.honeycomb.v3po.translate.read.ChildReader;
+import io.fd.honeycomb.v3po.translate.read.ListReader;
+import io.fd.honeycomb.v3po.translate.read.ReadContext;
+import io.fd.honeycomb.v3po.translate.spi.read.ListReaderCustomizer;
+import java.util.ArrayList;
+import java.util.List;
+import javax.annotation.Nonnull;
+import javax.annotation.concurrent.ThreadSafe;
+import org.opendaylight.yangtools.concepts.Builder;
+import org.opendaylight.yangtools.yang.binding.Augmentation;
+import org.opendaylight.yangtools.yang.binding.ChildOf;
+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;
+
+/**
+ * Composite implementation of {@link ChildReader} able to place the read result into parent builder object intended
+ * for list node type.
+ *
+ * This reader checks if the IDs are wildcarded in which case it performs read of all list entries. In case the ID has a
+ * key, it reads only the specified value.
+ */
+@Beta
+@ThreadSafe
+public final class CompositeListReader<C extends DataObject & Identifiable<K>, K extends Identifier<C>, B extends Builder<C>>
+        extends AbstractCompositeReader<C, B> implements ChildReader<C>, ListReader<C, K> {
+
+    private static final Logger LOG = LoggerFactory.getLogger(CompositeListReader.class);
+
+    private final ListReaderCustomizer<C, K, B> customizer;
+
+    /**
+     * Create new {@link CompositeListReader}
+     *
+     * @param managedDataObjectType Class object for managed data type. Must come from a list node type.
+     * @param childReaders          Child nodes(container, list) readers
+     * @param augReaders            Child augmentations readers
+     * @param customizer            Customizer instance to customize this generic reader
+     */
+    public CompositeListReader(@Nonnull final Class<C> managedDataObjectType,
+                               @Nonnull final List<ChildReader<? extends ChildOf<C>>> childReaders,
+                               @Nonnull final List<ChildReader<? extends Augmentation<C>>> augReaders,
+                               @Nonnull final ListReaderCustomizer<C, K, B> customizer) {
+        super(managedDataObjectType, childReaders, augReaders);
+        this.customizer = customizer;
+    }
+
+    /**
+     * @see {@link CompositeListReader#CompositeListReader(Class, List, List, ListReaderCustomizer)}
+     */
+    public CompositeListReader(@Nonnull final Class<C> managedDataObjectType,
+                               @Nonnull final List<ChildReader<? extends ChildOf<C>>> childReaders,
+                               @Nonnull final ListReaderCustomizer<C, K, B> customizer) {
+        this(managedDataObjectType, childReaders, RWUtils.<C>emptyAugReaderList(), customizer);
+    }
+
+    /**
+     * @see {@link CompositeListReader#CompositeListReader(Class, List, List, ListReaderCustomizer)}
+     */
+    public CompositeListReader(@Nonnull final Class<C> managedDataObjectType,
+                               @Nonnull final ListReaderCustomizer<C, K, B> customizer) {
+        this(managedDataObjectType, RWUtils.<C>emptyChildReaderList(), RWUtils.<C>emptyAugReaderList(),
+                customizer);
+    }
+
+    @Override
+    public void read(@Nonnull final InstanceIdentifier<? extends DataObject> id,
+                     @Nonnull final Builder<? extends DataObject> parentBuilder,
+                     @Nonnull final ReadContext ctx) throws ReadFailedException {
+        // Create ID pointing to current node
+        final InstanceIdentifier<C> currentId = RWUtils.appendTypeToId(id, getManagedDataObjectType());
+        // Read all, since current ID is definitely wildcarded
+        final List<C> ifcs = readList(currentId, ctx);
+        customizer.merge(parentBuilder, ifcs);
+    }
+
+    @Override
+    @Nonnull
+    public List<C> readList(@Nonnull final InstanceIdentifier<C> id,
+                            @Nonnull final ReadContext ctx) throws ReadFailedException {
+        LOG.trace("{}: Reading all list entries", this);
+        final List<K> allIds = customizer.getAllIds(id, ctx.getContext());
+        LOG.debug("{}: Reading list entries for: {}", this, allIds);
+
+        final ArrayList<C> allEntries = new ArrayList<>(allIds.size());
+        for (K key : allIds) {
+            final InstanceIdentifier.IdentifiableItem<C, K> currentBdItem =
+                    RWUtils.getCurrentIdItem(id, key);
+            final InstanceIdentifier<C> keyedId = RWUtils.replaceLastInId(id, currentBdItem);
+            final Optional<C> read = readCurrent(keyedId, ctx);
+            final DataObject singleItem = read.get();
+            checkArgument(getManagedDataObjectType().getTargetType().isAssignableFrom(singleItem.getClass()));
+            allEntries.add(getManagedDataObjectType().getTargetType().cast(singleItem));
+        }
+        return allEntries;
+    }
+
+    @Override
+    protected void readCurrentAttributes(@Nonnull final InstanceIdentifier<C> id, @Nonnull final B builder,
+                                         @Nonnull final ReadContext ctx)
+            throws ReadFailedException {
+        customizer.readCurrentAttributes(id, builder, ctx.getContext());
+    }
+
+    @Override
+    protected B getBuilder(@Nonnull final InstanceIdentifier<C> id) {
+        return customizer.getBuilder(id);
+    }
+
+}
diff --git a/v3po/translate-impl/src/main/java/io/fd/honeycomb/v3po/translate/impl/read/CompositeRootReader.java b/v3po/translate-impl/src/main/java/io/fd/honeycomb/v3po/translate/impl/read/CompositeRootReader.java
new file mode 100644
index 000000000..f297abb76
--- /dev/null
+++ b/v3po/translate-impl/src/main/java/io/fd/honeycomb/v3po/translate/impl/read/CompositeRootReader.java
@@ -0,0 +1,91 @@
+/*
+ * 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.v3po.translate.impl.read;
+
+import com.google.common.annotations.Beta;
+import io.fd.honeycomb.v3po.translate.read.ReadFailedException;
+import io.fd.honeycomb.v3po.translate.util.RWUtils;
+import io.fd.honeycomb.v3po.translate.read.ChildReader;
+import io.fd.honeycomb.v3po.translate.read.ReadContext;
+import io.fd.honeycomb.v3po.translate.read.Reader;
+import io.fd.honeycomb.v3po.translate.spi.read.RootReaderCustomizer;
+import java.util.List;
+import javax.annotation.Nonnull;
+import javax.annotation.concurrent.ThreadSafe;
+import org.opendaylight.yangtools.concepts.Builder;
+import org.opendaylight.yangtools.yang.binding.Augmentation;
+import org.opendaylight.yangtools.yang.binding.ChildOf;
+import org.opendaylight.yangtools.yang.binding.DataObject;
+import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
+
+/**
+ * Composite implementation of {@link Reader}
+ */
+@Beta
+@ThreadSafe
+public final class CompositeRootReader<C extends DataObject, B extends Builder<C>> extends AbstractCompositeReader<C, B>
+    implements Reader<C> {
+
+    private final RootReaderCustomizer<C, B> customizer;
+
+    /**
+     * Create new {@link CompositeRootReader}
+     *
+     * @param managedDataObjectType Class object for managed data type
+     * @param childReaders Child nodes(container, list) readers
+     * @param augReaders Child augmentations readers
+     * @param customizer Customizer instance to customize this generic reader
+     *
+     */
+    public CompositeRootReader(@Nonnull final Class<C> managedDataObjectType,
+                               @Nonnull final List<ChildReader<? extends ChildOf<C>>> childReaders,
+                               @Nonnull final List<ChildReader<? extends Augmentation<C>>> augReaders,
+                               @Nonnull final RootReaderCustomizer<C, B> customizer) {
+        super(managedDataObjectType, childReaders, augReaders);
+        this.customizer = customizer;
+    }
+
+    /**
+     * @see {@link CompositeRootReader#CompositeRootReader(Class, List, List, RootReaderCustomizer)}
+     */
+    public CompositeRootReader(@Nonnull final Class<C> managedDataObjectType,
+                               @Nonnull final List<ChildReader<? extends ChildOf<C>>> childReaders,
+                               @Nonnull final RootReaderCustomizer<C, B> customizer) {
+        this(managedDataObjectType, childReaders, RWUtils.<C>emptyAugReaderList(), customizer);
+    }
+
+    /**
+     * @see {@link CompositeRootReader#CompositeRootReader(Class, List, List, RootReaderCustomizer)}
+     */
+    public CompositeRootReader(@Nonnull final Class<C> managedDataObjectType,
+                               @Nonnull final RootReaderCustomizer<C, B> customizer) {
+        this(managedDataObjectType, RWUtils.<C>emptyChildReaderList(), RWUtils.<C>emptyAugReaderList(),
+            customizer);
+    }
+
+    @Override
+    protected void readCurrentAttributes(@Nonnull final InstanceIdentifier<C> id, @Nonnull final B builder,
+                                         @Nonnull final ReadContext ctx) throws ReadFailedException {
+        customizer.readCurrentAttributes(id, builder, ctx.getContext());
+    }
+
+    @Override
+    protected B getBuilder(@Nonnull final InstanceIdentifier<C> id) {
+        return customizer.getBuilder(id);
+    }
+
+}
diff --git a/v3po/translate-impl/src/main/java/io/fd/honeycomb/v3po/translate/impl/write/AbstractCompositeWriter.java b/v3po/translate-impl/src/main/java/io/fd/honeycomb/v3po/translate/impl/write/AbstractCompositeWriter.java
new file mode 100644
index 000000000..e971fbeff
--- /dev/null
+++ b/v3po/translate-impl/src/main/java/io/fd/honeycomb/v3po/translate/impl/write/AbstractCompositeWriter.java
@@ -0,0 +1,270 @@
+/*
+ * 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.v3po.translate.impl.write;
+
+import static com.google.common.base.Preconditions.checkArgument;
+
+import com.google.common.base.Optional;
+import com.google.common.collect.Lists;
+import io.fd.honeycomb.v3po.translate.TranslationException;
+import io.fd.honeycomb.v3po.translate.write.ChildWriter;
+import io.fd.honeycomb.v3po.translate.write.WriteContext;
+import io.fd.honeycomb.v3po.translate.util.RWUtils;
+import io.fd.honeycomb.v3po.translate.write.Writer;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.List;
+import java.util.Map;
+import javax.annotation.Nonnull;
+import javax.annotation.Nullable;
+import org.opendaylight.yangtools.yang.binding.Augmentation;
+import org.opendaylight.yangtools.yang.binding.ChildOf;
+import org.opendaylight.yangtools.yang.binding.DataObject;
+import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public abstract class AbstractCompositeWriter<D extends DataObject> implements Writer<D> {
+
+    private static final Logger LOG = LoggerFactory.getLogger(AbstractCompositeWriter.class);
+
+    private final Map<Class<? extends DataObject>, ChildWriter<? extends ChildOf<D>>> childWriters;
+    private final Map<Class<? extends DataObject>, ChildWriter<? extends Augmentation<D>>> augWriters;
+    private final InstanceIdentifier<D> instanceIdentifier;
+
+    public AbstractCompositeWriter(final Class<D> type,
+                                   final List<ChildWriter<? extends ChildOf<D>>> childWriters,
+                                   final List<ChildWriter<? extends Augmentation<D>>> augWriters) {
+        this.instanceIdentifier = InstanceIdentifier.create(type);
+        this.childWriters = RWUtils.uniqueLinkedIndex(childWriters, RWUtils.MANAGER_CLASS_FUNCTION);
+        this.augWriters = RWUtils.uniqueLinkedIndex(augWriters, RWUtils.MANAGER_CLASS_AUG_FUNCTION);
+    }
+
+    protected void writeCurrent(final InstanceIdentifier<D> id, final D data, final WriteContext ctx) {
+        LOG.debug("{}: Writing current: {} data: {}", this, id, data);
+
+        LOG.trace("{}: Writing current attributes", this);
+        writeCurrentAttributes(id, data, ctx);
+
+        for (ChildWriter<? extends ChildOf<D>> child : childWriters.values()) {
+            LOG.debug("{}: Writing child in: {}", this, child);
+            child.writeChild(id, data, ctx);
+        }
+
+        for (ChildWriter<? extends Augmentation<D>> child : augWriters.values()) {
+            LOG.debug("{}: Writing augment in: {}", this, child);
+            child.writeChild(id, data, ctx);
+        }
+
+        LOG.debug("{}: Current node written successfully", this);
+    }
+
+    protected void updateCurrent(final InstanceIdentifier<D> id, final D dataBefore, final D dataAfter,
+                                 final WriteContext ctx) {
+        LOG.debug("{}: Updating current: {} dataBefore: {}, datAfter: {}", this, id, dataBefore, dataAfter);
+
+        if(dataBefore.equals(dataAfter)) {
+            LOG.debug("{}: Skipping current(no update): {}", this, id);
+            // No change, ignore
+            return;
+        }
+
+        LOG.trace("{}: Updating current attributes", this);
+        updateCurrentAttributes(id, dataBefore, dataAfter, ctx);
+
+        for (ChildWriter<? extends ChildOf<D>> child : childWriters.values()) {
+            LOG.debug("{}: Updating child in: {}", this, child);
+            child.updateChild(id, dataBefore, dataAfter, ctx);
+        }
+
+        for (ChildWriter<? extends Augmentation<D>> child : augWriters.values()) {
+            LOG.debug("{}: Updating augment in: {}", this, child);
+            child.updateChild(id, dataBefore, dataAfter, ctx);
+        }
+
+        LOG.debug("{}: Current node updated successfully", this);
+    }
+
+    protected void deleteCurrent(final InstanceIdentifier<D> id, final D dataBefore, final WriteContext ctx) {
+        LOG.debug("{}: Deleting current: {} dataBefore: {}", this, id, dataBefore);
+
+        // delete in reversed order
+        for (ChildWriter<? extends Augmentation<D>> child : reverseCollection(augWriters.values())) {
+            LOG.debug("{}: Deleting augment in: {}", this, child);
+            child.deleteChild(id, dataBefore, ctx);
+        }
+
+        for (ChildWriter<? extends ChildOf<D>> child : reverseCollection(childWriters.values())) {
+            LOG.debug("{}: Deleting child in: {}", this, child);
+            child.deleteChild(id, dataBefore, ctx);
+        }
+
+        LOG.trace("{}: Deleting current attributes", this);
+        deleteCurrentAttributes(id, dataBefore, ctx);
+    }
+
+    @SuppressWarnings("unchecked")
+    @Override
+    public void update(@Nonnull final InstanceIdentifier<? extends DataObject> id,
+                       @Nullable final DataObject dataBefore,
+                       @Nullable final DataObject dataAfter,
+                       @Nonnull final WriteContext ctx) throws TranslationException {
+        LOG.debug("{}: Updating : {}", this, id);
+        LOG.trace("{}: Updating : {}, from: {} to: {}", this, id, dataBefore, dataAfter);
+
+        if (idPointsToCurrent(id)) {
+            if(isWrite(dataBefore, dataAfter)) {
+                writeCurrent((InstanceIdentifier<D>) id, castToManaged(dataAfter), ctx);
+            } else if(isDelete(dataBefore, dataAfter)) {
+                deleteCurrent((InstanceIdentifier<D>) id, castToManaged(dataBefore), ctx);
+            } else {
+                checkArgument(dataBefore != null && dataAfter != null, "No data to process");
+                updateCurrent((InstanceIdentifier<D>) id, castToManaged(dataBefore), castToManaged(dataAfter), ctx);
+            }
+        } else {
+            if (isWrite(dataBefore, dataAfter)) {
+                writeSubtree(id, dataAfter, ctx);
+            } else if (isDelete(dataBefore, dataAfter)) {
+                deleteSubtree(id, dataBefore, ctx);
+            } else {
+                checkArgument(dataBefore != null && dataAfter != null, "No data to process");
+                updateSubtree(id, dataBefore, dataAfter, ctx);
+            }
+        }
+    }
+
+    private void checkDataType(final @Nullable DataObject dataAfter) {
+        checkArgument(getManagedDataObjectType().getTargetType().isAssignableFrom(dataAfter.getClass()));
+    }
+
+    private D castToManaged(final DataObject data) {
+        checkDataType(data);
+        return getManagedDataObjectType().getTargetType().cast(data);
+    }
+
+    private static boolean isWrite(final DataObject dataBefore,
+                                    final DataObject dataAfter) {
+        return dataBefore == null && dataAfter != null;
+    }
+
+    private static boolean isDelete(final DataObject dataBefore,
+                                    final DataObject dataAfter) {
+        return dataAfter == null && dataBefore != null;
+    }
+
+    private void writeSubtree(final InstanceIdentifier<? extends DataObject> id,
+                              final DataObject dataAfter, final WriteContext ctx) throws TranslationException {
+        LOG.debug("{}: Writing subtree: {}", this, id);
+        final Writer<? extends ChildOf<D>> writer = getNextWriter(id);
+
+        if (writer != null) {
+            LOG.debug("{}: Writing subtree: {} in: {}", this, id, writer);
+            writer.update(id, null, dataAfter, ctx);
+        } else {
+            // If there's no dedicated writer, use write current
+            // But we need current data after to do so
+            final InstanceIdentifier<D> currentId = RWUtils.cutId(id, getManagedDataObjectType());
+            Optional<DataObject> currentDataAfter = ctx.readAfter(currentId);
+            LOG.debug("{}: Dedicated subtree writer missing for: {}. Writing current.", this,
+                RWUtils.getNextId(id, getManagedDataObjectType()).getType(), currentDataAfter);
+            writeCurrent(currentId, castToManaged(currentDataAfter.get()), ctx);
+        }
+    }
+
+    private boolean idPointsToCurrent(final @Nonnull InstanceIdentifier<? extends DataObject> id) {
+        return id.getTargetType().equals(getManagedDataObjectType().getTargetType());
+    }
+
+    @SuppressWarnings("unchecked")
+    private void deleteSubtree(final InstanceIdentifier<? extends DataObject> id,
+                               final DataObject dataBefore, final WriteContext ctx) throws TranslationException {
+        LOG.debug("{}: Deleting subtree: {}", this, id);
+        final Writer<? extends ChildOf<D>> writer = getNextWriter(id);
+
+        if (writer != null) {
+            LOG.debug("{}: Deleting subtree: {} in: {}", this, id, writer);
+            writer.update(id, dataBefore, null, ctx);
+        } else {
+            updateSubtreeFromCurrent(id, ctx);
+        }
+    }
+
+    @SuppressWarnings("unchecked")
+    private void updateSubtreeFromCurrent(final InstanceIdentifier<? extends DataObject> id, final WriteContext ctx) {
+        final InstanceIdentifier<D> currentId = RWUtils.cutId(id, getManagedDataObjectType());
+        Optional<DataObject> currentDataBefore = ctx.readBefore(currentId);
+        Optional<DataObject> currentDataAfter = ctx.readAfter(currentId);
+        LOG.debug("{}: Dedicated subtree writer missing for: {}. Updating current without subtree", this,
+            RWUtils.getNextId(id, getManagedDataObjectType()).getType(), currentDataAfter);
+        updateCurrent((InstanceIdentifier<D>) id, castToManaged(currentDataBefore.orNull()),
+            castToManaged(currentDataAfter.orNull()), ctx);
+    }
+
+    @SuppressWarnings("unchecked")
+    private void updateSubtree(final InstanceIdentifier<? extends DataObject> id,
+                               final DataObject dataBefore,
+                               final DataObject dataAfter,
+                               final WriteContext ctx) throws TranslationException {
+        LOG.debug("{}: Updating subtree: {}", this, id);
+        final Writer<? extends ChildOf<D>> writer = getNextWriter(id);
+
+        if (writer != null) {
+            LOG.debug("{}: Updating subtree: {} in: {}", this, id, writer);
+            writer.update(id, dataBefore, dataAfter, ctx);
+        } else {
+            updateSubtreeFromCurrent(id, ctx);
+        }
+    }
+
+    private Writer<? extends ChildOf<D>> getNextWriter(final InstanceIdentifier<? extends DataObject> id) {
+        final Class<? extends DataObject> next = RWUtils.getNextId(id, getManagedDataObjectType()).getType();
+        return childWriters.get(next);
+    }
+
+    private static <T> List<T> reverseCollection(final Collection<T> original) {
+        // TODO find a better reverse mechanism (probably a different collection for child writers is necessary)
+        final ArrayList<T> list = Lists.newArrayList(original);
+        Collections.reverse(list);
+        return list;
+    }
+
+    protected abstract void writeCurrentAttributes(@Nonnull final InstanceIdentifier<D> id,
+                                                   @Nonnull final D data,
+                                                   @Nonnull final WriteContext ctx);
+
+    protected abstract void deleteCurrentAttributes(@Nonnull final InstanceIdentifier<D> id,
+                                                    @Nonnull final D dataBefore,
+                                                    @Nonnull final WriteContext ctx);
+
+    protected abstract void updateCurrentAttributes(@Nonnull final InstanceIdentifier<D> id,
+                                                    @Nonnull final D dataBefore,
+                                                    @Nonnull final D dataAfter,
+                                                    @Nonnull final WriteContext ctx);
+
+    @Nonnull
+    @Override
+    public InstanceIdentifier<D> getManagedDataObjectType() {
+        return instanceIdentifier;
+    }
+
+
+    @Override
+    public String toString() {
+        return String.format("Writer[%s]", getManagedDataObjectType().getTargetType().getSimpleName());
+    }
+}
diff --git a/v3po/translate-impl/src/main/java/io/fd/honeycomb/v3po/translate/impl/write/CompositeChildWriter.java b/v3po/translate-impl/src/main/java/io/fd/honeycomb/v3po/translate/impl/write/CompositeChildWriter.java
new file mode 100644
index 000000000..fbfeffbdb
--- /dev/null
+++ b/v3po/translate-impl/src/main/java/io/fd/honeycomb/v3po/translate/impl/write/CompositeChildWriter.java
@@ -0,0 +1,105 @@
+/*
+ * 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.v3po.translate.impl.write;
+
+import com.google.common.base.Optional;
+import io.fd.honeycomb.v3po.translate.write.ChildWriter;
+import io.fd.honeycomb.v3po.translate.write.WriteContext;
+import io.fd.honeycomb.v3po.translate.util.RWUtils;
+import io.fd.honeycomb.v3po.translate.spi.write.ChildWriterCustomizer;
+import java.util.List;
+import javax.annotation.Nonnull;
+import org.opendaylight.yangtools.yang.binding.Augmentation;
+import org.opendaylight.yangtools.yang.binding.ChildOf;
+import org.opendaylight.yangtools.yang.binding.DataObject;
+import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
+
+public class CompositeChildWriter<D extends DataObject> extends AbstractCompositeWriter<D>
+    implements ChildWriter<D> {
+
+    private final ChildWriterCustomizer<D> customizer;
+
+    public CompositeChildWriter(@Nonnull final Class<D> type,
+                                @Nonnull final List<ChildWriter<? extends ChildOf<D>>> childWriters,
+                                @Nonnull final List<ChildWriter<? extends Augmentation<D>>> augWriters,
+                                @Nonnull final ChildWriterCustomizer<D> customizer) {
+        super(type, childWriters, augWriters);
+        this.customizer = customizer;
+    }
+
+    public CompositeChildWriter(@Nonnull final Class<D> type,
+                                @Nonnull final List<ChildWriter<? extends ChildOf<D>>> childWriters,
+                                @Nonnull final ChildWriterCustomizer<D> customizer) {
+        this(type, childWriters, RWUtils.<D>emptyAugWriterList(), customizer);
+    }
+
+    public CompositeChildWriter(@Nonnull final Class<D> type,
+                                @Nonnull final ChildWriterCustomizer<D> customizer) {
+        this(type, RWUtils.<D>emptyChildWriterList(), RWUtils.<D>emptyAugWriterList(), customizer);
+    }
+
+    @Override
+    protected void writeCurrentAttributes(@Nonnull final InstanceIdentifier<D> id, @Nonnull final D data,
+                                          @Nonnull final WriteContext ctx) {
+        customizer.writeCurrentAttributes(id, data, ctx.getContext());
+    }
+
+    @Override
+    protected void deleteCurrentAttributes(@Nonnull final InstanceIdentifier<D> id, @Nonnull final D dataBefore,
+                                           @Nonnull WriteContext ctx) {
+        customizer.deleteCurrentAttributes(id, dataBefore, ctx.getContext());
+    }
+
+    @Override
+    protected void updateCurrentAttributes(@Nonnull final InstanceIdentifier<D> id, @Nonnull final D dataBefore,
+                                           @Nonnull final D dataAfter, @Nonnull WriteContext ctx) {
+        customizer.updateCurrentAttributes(id, dataBefore, dataAfter, ctx.getContext());
+    }
+
+    @Override
+    public void writeChild(@Nonnull final InstanceIdentifier<? extends DataObject> parentId,
+                           @Nonnull final DataObject parentData, @Nonnull WriteContext ctx) {
+        final InstanceIdentifier<D> currentId = RWUtils.appendTypeToId(parentId, getManagedDataObjectType());
+        final Optional<D> currentData = customizer.extract(currentId, parentData);
+        if(currentData.isPresent()) {
+            writeCurrent(currentId, currentData.get(), ctx);
+        }
+    }
+
+    @Override
+    public void deleteChild(@Nonnull final InstanceIdentifier<? extends DataObject> parentId,
+                            @Nonnull final DataObject parentData,
+                            @Nonnull final WriteContext ctx) {
+        final InstanceIdentifier<D> currentId = RWUtils.appendTypeToId(parentId, getManagedDataObjectType());
+        final Optional<D> currentData = customizer.extract(currentId, parentData);
+        if(currentData.isPresent()) {
+            deleteCurrent(currentId, currentData.get(), ctx);
+        }
+    }
+
+    @Override
+    public void updateChild(@Nonnull final InstanceIdentifier<? extends DataObject> parentId,
+                            @Nonnull final DataObject parentDataBefore, @Nonnull final DataObject parentDataAfter,
+                            @Nonnull final WriteContext ctx) {
+        final InstanceIdentifier<D> currentId = RWUtils.appendTypeToId(parentId, getManagedDataObjectType());
+        final Optional<D> before = customizer.extract(currentId, parentDataBefore);
+        final Optional<D> after = customizer.extract(currentId, parentDataAfter);
+        if(before.isPresent() && after.isPresent()) {
+            updateCurrent(currentId, before.get(), after.get(), ctx);
+        }
+    }
+}
diff --git a/v3po/translate-impl/src/main/java/io/fd/honeycomb/v3po/translate/impl/write/CompositeListWriter.java b/v3po/translate-impl/src/main/java/io/fd/honeycomb/v3po/translate/impl/write/CompositeListWriter.java
new file mode 100644
index 000000000..dc924fe39
--- /dev/null
+++ b/v3po/translate-impl/src/main/java/io/fd/honeycomb/v3po/translate/impl/write/CompositeListWriter.java
@@ -0,0 +1,179 @@
+/*
+ * 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.v3po.translate.impl.write;
+
+import com.google.common.base.Function;
+import com.google.common.collect.ImmutableMap;
+import com.google.common.collect.Maps;
+import com.google.common.collect.Sets;
+import io.fd.honeycomb.v3po.translate.spi.write.ListWriterCustomizer;
+import io.fd.honeycomb.v3po.translate.write.ChildWriter;
+import io.fd.honeycomb.v3po.translate.write.WriteContext;
+import io.fd.honeycomb.v3po.translate.util.RWUtils;
+import java.util.List;
+import java.util.Map;
+import javax.annotation.Nonnull;
+import org.opendaylight.yangtools.yang.binding.Augmentation;
+import org.opendaylight.yangtools.yang.binding.ChildOf;
+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;
+
+public class CompositeListWriter<D extends DataObject & Identifiable<K>, K extends Identifier<D>> extends
+    AbstractCompositeWriter<D>
+    implements ChildWriter<D> {
+
+    public static final Function<DataObject, Object> INDEX_FUNCTION = new Function<DataObject, Object>() {
+        @Override
+        public Object apply(final DataObject input) {
+            return input instanceof Identifiable<?>
+                ? ((Identifiable<?>) input).getKey()
+                : input;
+        }
+    };
+
+
+    private final ListWriterCustomizer<D, K> customizer;
+
+    public CompositeListWriter(@Nonnull final Class<D> type,
+                               @Nonnull final List<ChildWriter<? extends ChildOf<D>>> childWriters,
+                               @Nonnull final List<ChildWriter<? extends Augmentation<D>>> augWriters,
+                               @Nonnull final ListWriterCustomizer<D, K> customizer) {
+        super(type, childWriters, augWriters);
+        this.customizer = customizer;
+    }
+
+    public CompositeListWriter(@Nonnull final Class<D> type,
+                               @Nonnull final List<ChildWriter<? extends ChildOf<D>>> childWriters,
+                               @Nonnull final ListWriterCustomizer<D, K> customizer) {
+        this(type, childWriters, RWUtils.<D>emptyAugWriterList(), customizer);
+    }
+
+    public CompositeListWriter(@Nonnull final Class<D> type,
+                               @Nonnull final ListWriterCustomizer<D, K> customizer) {
+        this(type, RWUtils.<D>emptyChildWriterList(), RWUtils.<D>emptyAugWriterList(), customizer);
+
+    }
+
+    @Override
+    protected void writeCurrentAttributes(@Nonnull final InstanceIdentifier<D> id, @Nonnull final D data,
+                                          @Nonnull final WriteContext ctx) {
+        customizer.writeCurrentAttributes(id, data, ctx.getContext());
+    }
+
+    @Override
+    protected void deleteCurrentAttributes(@Nonnull final InstanceIdentifier<D> id, @Nonnull final D dataBefore,
+                                           @Nonnull final WriteContext ctx) {
+        customizer.deleteCurrentAttributes(id, dataBefore, ctx.getContext());
+    }
+
+    @Override
+    protected void updateCurrentAttributes(@Nonnull final InstanceIdentifier<D> id, @Nonnull final D dataBefore,
+                                           @Nonnull final D dataAfter, @Nonnull final WriteContext ctx) {
+        customizer.updateCurrentAttributes(id, dataBefore, dataAfter, ctx.getContext());
+    }
+
+    @Override
+    public void writeChild(@Nonnull final InstanceIdentifier<? extends DataObject> parentId,
+                           @Nonnull final DataObject parentData,
+                           @Nonnull final WriteContext ctx) {
+        final InstanceIdentifier<D> currentId = RWUtils.appendTypeToId(parentId, getManagedDataObjectType());
+        final List<D> currentData = customizer.extract(currentId, parentData);
+        for (D entry : currentData) {
+            writeCurrent(currentId, entry, ctx);
+        }
+    }
+
+    @Override
+    public void deleteChild(@Nonnull final InstanceIdentifier<? extends DataObject> parentId,
+                            @Nonnull final DataObject parentDataBefore,
+                            @Nonnull final WriteContext ctx) {
+        final InstanceIdentifier<D> currentId = RWUtils.appendTypeToId(parentId, getManagedDataObjectType());
+        final List<D> dataBefore = customizer.extract(currentId, parentDataBefore);
+        for (D entry : dataBefore) {
+            deleteCurrent(currentId, entry, ctx);
+        }
+    }
+
+    @Override
+    public void updateChild(@Nonnull final InstanceIdentifier<? extends DataObject> parentId,
+                            @Nonnull final DataObject parentDataBefore, @Nonnull final DataObject parentDataAfter,
+                            @Nonnull final WriteContext ctx) {
+        final InstanceIdentifier<D> currentId = RWUtils.appendTypeToId(parentId, getManagedDataObjectType());
+        final ImmutableMap<Object, D>
+            dataBefore = Maps.uniqueIndex(customizer.extract(currentId, parentDataBefore), INDEX_FUNCTION);
+        final ImmutableMap<Object, D>
+            dataAfter = Maps.uniqueIndex(customizer.extract(currentId, parentDataAfter), INDEX_FUNCTION);
+
+        for (Map.Entry<Object, D> after : dataAfter.entrySet()) {
+            final D before = dataBefore.get(after.getKey());
+            if(before == null) {
+                writeCurrent(currentId, after.getValue(), ctx);
+            } else {
+                updateCurrent(currentId, before, after.getValue(), ctx);
+            }
+        }
+
+        // Delete the rest in dataBefore
+        for (Object deletedNodeKey : Sets.difference(dataBefore.keySet(), dataAfter.keySet())) {
+            final D deleted = dataBefore.get(deletedNodeKey);
+            deleteCurrent(currentId, deleted, ctx);
+        }
+
+    }
+
+    @Override
+    protected void writeCurrent(final InstanceIdentifier<D> id, final D data, final WriteContext ctx) {
+        // Make sure the key is present
+        if(isWildcarded(id)) {
+            super.writeCurrent(getSpecificId(id, data), data, ctx);
+        } else {
+            super.writeCurrent(id, data, ctx);
+        }
+    }
+
+    @Override
+    protected void updateCurrent(final InstanceIdentifier<D> id, final D dataBefore, final D dataAfter,
+                                 final WriteContext ctx) {
+        // Make sure the key is present
+        if(isWildcarded(id)) {
+            super.updateCurrent(getSpecificId(id, dataBefore), dataBefore, dataAfter, ctx);
+        } else {
+            super.updateCurrent(id, dataBefore, dataAfter, ctx);
+        }
+    }
+
+    @Override
+    protected void deleteCurrent(final InstanceIdentifier<D> id, final D dataBefore, final WriteContext ctx) {
+        // Make sure the key is present
+        if(isWildcarded(id)) {
+            super.deleteCurrent(getSpecificId(id, dataBefore), dataBefore, ctx);
+        } else {
+            super.deleteCurrent(id, dataBefore, ctx);
+        }
+    }
+
+    private boolean isWildcarded(final InstanceIdentifier<D> id) {
+        return id.firstIdentifierOf(getManagedDataObjectType().getTargetType()).isWildcarded();
+    }
+
+    private InstanceIdentifier<D> getSpecificId(final InstanceIdentifier<D> currentId, final D current) {
+        return RWUtils.replaceLastInId(currentId,
+            new InstanceIdentifier.IdentifiableItem<>(currentId.getTargetType(), current.getKey()));
+    }
+}
diff --git a/v3po/translate-impl/src/main/java/io/fd/honeycomb/v3po/translate/impl/write/CompositeRootWriter.java b/v3po/translate-impl/src/main/java/io/fd/honeycomb/v3po/translate/impl/write/CompositeRootWriter.java
new file mode 100644
index 000000000..acf2cfd2e
--- /dev/null
+++ b/v3po/translate-impl/src/main/java/io/fd/honeycomb/v3po/translate/impl/write/CompositeRootWriter.java
@@ -0,0 +1,72 @@
+/*
+ * 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.v3po.translate.impl.write;
+
+import io.fd.honeycomb.v3po.translate.write.WriteContext;
+import io.fd.honeycomb.v3po.translate.util.RWUtils;
+import io.fd.honeycomb.v3po.translate.spi.write.RootWriterCustomizer;
+import io.fd.honeycomb.v3po.translate.write.ChildWriter;
+import java.util.List;
+import javax.annotation.Nonnull;
+import org.opendaylight.yangtools.yang.binding.Augmentation;
+import org.opendaylight.yangtools.yang.binding.ChildOf;
+import org.opendaylight.yangtools.yang.binding.DataObject;
+import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
+
+public class CompositeRootWriter<D extends DataObject> extends AbstractCompositeWriter<D> {
+
+    private final RootWriterCustomizer<D> customizer;
+
+    public CompositeRootWriter(@Nonnull final Class<D> type,
+                               @Nonnull final List<ChildWriter<? extends ChildOf<D>>> childWriters,
+                               @Nonnull final List<ChildWriter<? extends Augmentation<D>>> augWriters,
+                               @Nonnull final RootWriterCustomizer<D> customizer) {
+        super(type, childWriters, augWriters);
+        this.customizer = customizer;
+    }
+
+    public CompositeRootWriter(@Nonnull final Class<D> type,
+                               @Nonnull final List<ChildWriter<? extends ChildOf<D>>> childWriters,
+                               @Nonnull final RootWriterCustomizer<D> customizer) {
+        this(type, childWriters, RWUtils.<D>emptyAugWriterList(), customizer);
+    }
+
+    public CompositeRootWriter(@Nonnull final Class<D> type,
+                               @Nonnull final RootWriterCustomizer<D> customizer) {
+        this(type, RWUtils.<D>emptyChildWriterList(), RWUtils.<D>emptyAugWriterList(), customizer);
+    }
+
+    @Override
+    protected void writeCurrentAttributes(@Nonnull final InstanceIdentifier<D> id, @Nonnull final D data,
+                                          @Nonnull final WriteContext ctx) {
+        customizer.writeCurrentAttributes(id, data, ctx.getContext());
+    }
+
+    @Override
+    protected void deleteCurrentAttributes(@Nonnull final InstanceIdentifier<D> id, @Nonnull final D dataBefore,
+                                           @Nonnull final WriteContext ctx) {
+        customizer.deleteCurrentAttributes(id, dataBefore, ctx.getContext());
+    }
+
+    @Override
+    protected void updateCurrentAttributes(@Nonnull final InstanceIdentifier<D> id,
+                                           @Nonnull final D dataBefore,
+                                           @Nonnull final D dataAfter,
+                                           @Nonnull final WriteContext ctx) {
+        customizer.updateCurrentAttributes(id, dataBefore, dataAfter, ctx.getContext());
+    }
+}