/*
* ModeShape (http://www.modeshape.org)
*
* 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 org.modeshape.jcr.query;
import java.util.ArrayList;
import java.util.List;
import java.util.Set;
import org.modeshape.jcr.cache.CachedNode.Properties;
import org.modeshape.jcr.cache.NodeKey;
import org.modeshape.jcr.query.engine.NoOpQueryIndexWriter;
import org.modeshape.jcr.spi.index.IndexWriter;
import org.modeshape.jcr.spi.index.provider.IndexProvider;
import org.modeshape.jcr.value.Name;
import org.modeshape.jcr.value.Path;
/**
* A composition of multiple QueryIndexWriter instances.
*/
public class CompositeIndexWriter implements IndexWriter {
public static IndexWriter create( Iterable<IndexProvider> providers ) {
final List<IndexWriter> writers = new ArrayList<>();
for (IndexProvider provider : providers) {
if (provider != null) {
IndexWriter writer = provider.getIndexWriter();
if (writer != null && !writer.canBeSkipped()) writers.add(writer);
}
}
if (writers.isEmpty()) return NoOpQueryIndexWriter.INSTANCE;
if (writers.size() == 1) return writers.get(0);
return new CompositeIndexWriter(writers);
}
private final List<IndexWriter> writers;
protected CompositeIndexWriter( List<IndexWriter> writers ) {
this.writers = writers;
}
@Override
public void clearAllIndexes() {
for (IndexWriter writer : writers) {
writer.clearAllIndexes();
}
}
@Override
public boolean canBeSkipped() {
if (writers.isEmpty()) return true;
for (IndexWriter writer : writers) {
if (!writer.canBeSkipped()) return false;
}
return true;
}
@Override
public void add( String workspace,
NodeKey key,
Path path,
Name primaryType,
Set<Name> mixinTypes,
Properties properties ) {
for (IndexWriter writer : writers) {
writer.add(workspace, key, path, primaryType, mixinTypes, properties);
}
}
}