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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.v3po.translate.util.read;
import static com.google.common.base.Preconditions.checkNotNull;
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.v3po.translate.read.ListReader;
import io.fd.honeycomb.v3po.translate.read.ReadContext;
import io.fd.honeycomb.v3po.translate.read.ReadFailedException;
import io.fd.honeycomb.v3po.translate.read.ReaderRegistry;
import io.fd.honeycomb.v3po.translate.util.RWUtils;
import io.fd.honeycomb.v3po.translate.read.Reader;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import javax.annotation.Nonnull;
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.
*
* This could serve as a utility to hold & hide all available readers in upper layers.
*/
public final class DelegatingReaderRegistry implements ReaderRegistry {
private static final Logger LOG = LoggerFactory.getLogger(DelegatingReaderRegistry.class);
private final Map<Class<? extends DataObject>, Reader<? extends DataObject>> rootReaders;
/**
* Create new {@link DelegatingReaderRegistry}
*
* @param rootReaders List of delegate readers
*/
public DelegatingReaderRegistry(@Nonnull final List<Reader<? extends DataObject>> rootReaders) {
this.rootReaders = RWUtils.uniqueLinkedIndex(checkNotNull(rootReaders), RWUtils.MANAGER_CLASS_FUNCTION);
}
@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> 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;
}
@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> 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);
}
/**
* @throws UnsupportedOperationException This getter is not supported for reader registry since it does not manage a
* specific node type
*/
@Nonnull
@Override
public InstanceIdentifier<DataObject> getManagedDataObjectType() {
throw new UnsupportedOperationException("Root registry has no type");
}
}
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