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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 static com.google.common.base.Preconditions.checkArgument;
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 io.fd.honeycomb.translate.util.read.DelegatingReader;
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.Optional;
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 DelegatingReader<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 Reader<D, B> getDelegate() {
return delegate;
}
@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.ofNullable(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.ofNullable(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 DelegatingListReader<D, K, B>, 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;
}
@Override
public ListReader<D, K, B> getDelegate() {
return delegate;
}
}
}
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