1 files changed, 109 insertions, 0 deletions
diff --git a/infra/translate-utils/src/main/java/io/fd/honeycomb/v3po/translate/util/read/registry/CompositeReaderRegistryBuilder.java b/infra/translate-utils/src/main/java/io/fd/honeycomb/v3po/translate/util/read/registry/CompositeReaderRegistryBuilder.java
new file mode 100644
index 000000000..3adda713d
--- /dev/null
+++ b/infra/translate-utils/src/main/java/io/fd/honeycomb/v3po/translate/util/read/registry/CompositeReaderRegistryBuilder.java
@@ -0,0 +1,109 @@
+/*
+ * 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.util.read.registry;
+
+import com.google.common.collect.ImmutableMap;
+import io.fd.honeycomb.v3po.translate.read.Reader;
+import io.fd.honeycomb.v3po.translate.read.registry.ModifiableReaderRegistryBuilder;
+import io.fd.honeycomb.v3po.translate.read.registry.ReaderRegistry;
+import io.fd.honeycomb.v3po.translate.read.registry.ReaderRegistryBuilder;
+import io.fd.honeycomb.v3po.translate.util.AbstractSubtreeManagerRegistryBuilderBuilder;
+import io.fd.honeycomb.v3po.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 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);
+    }
+}