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/*
* 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.impl.read.registry;
import com.google.common.collect.ImmutableMap;
import io.fd.honeycomb.translate.impl.read.GenericReader;
import io.fd.honeycomb.translate.read.InitReader;
import io.fd.honeycomb.translate.read.Initializer;
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 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.Identifiable;
import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import static com.google.common.base.Preconditions.checkArgument;
@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 Initializer
? InitSubtreeReader.createForReader(handledChildren, (InitReader<?, ?>) reader)
: SubtreeReader.createForReader(handledChildren, reader);
}
@Override
public <D extends DataObject> void addStructuralReader(@Nonnull InstanceIdentifier<D> id,
@Nonnull Class<? extends Builder<D>> builderType) {
// TODO https://jira.fd.io/browse/HONEYCOMB-344 provide variant of this method for list nodes
// prevent case to submit structural reader for list, which would cause fail because target setter consumes
// List<TargetType>, not Target type. If node is static, customizer that handles it should return static list
// of IDs.
checkArgument(!Identifiable.class.isAssignableFrom(id.getTargetType()), "Structural readers cannot be used for keyed nodes[node type %s]", id.getTargetType());
add(GenericReader.createReflexive(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);
}
}
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