/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.apache.jackrabbit.core.query.lucene.join;
import java.io.IOException;
import javax.jcr.RepositoryException;
import org.apache.jackrabbit.core.query.lucene.MultiColumnQueryHits;
import org.apache.jackrabbit.core.query.lucene.ScoreNode;
import org.apache.jackrabbit.core.HierarchyManager;
import org.apache.jackrabbit.spi.Name;
import org.apache.jackrabbit.spi.Path;
import org.apache.jackrabbit.spi.commons.name.PathBuilder;
/**
* <code>DescendantPathNodeJoin</code> implements a descendant path node join
* condition.
*/
public class DescendantPathNodeJoin extends AbstractCondition {
/**
* A score node map with the score nodes from the inner query hits, indexed
* by the path of the of the inner query hits plus the relative path of this
* condition.
*/
private final ScoreNodeMap contextIndex = new ScoreNodeMap();
/**
* The hierarchy manager.
*/
private final HierarchyManager hmgr;
/**
* Creates a new descendant path node join condition.
*
* @param context the inner query hits.
* @param contextSelectorName the selector name for the inner query hits.
* @param relPath the relative path of the join condition.
* @param hmgr the hierarchy manager.
* @throws IOException if an error occurs while reading from the index.
*/
public DescendantPathNodeJoin(MultiColumnQueryHits context,
Name contextSelectorName,
Path relPath,
HierarchyManager hmgr) throws IOException {
super(context);
this.hmgr = hmgr;
int idx = getIndex(context, contextSelectorName);
ScoreNode[] nodes;
while ((nodes = context.nextScoreNodes()) != null) {
try {
Path p = hmgr.getPath(nodes[idx].getNodeId());
PathBuilder builder = new PathBuilder(p);
builder.addAll(relPath.getElements());
p = builder.getPath().getNormalizedPath();
contextIndex.addScoreNodes(p, nodes);
} catch (RepositoryException e) {
// ignore
}
}
}
/**
* {@inheritDoc}
* <p/>
* The outer query hits loop contains the descendant nodes.
*/
public ScoreNode[][] getMatchingScoreNodes(ScoreNode descendant)
throws IOException {
try {
Path p = hmgr.getPath(descendant.getNodeId());
return contextIndex.getScoreNodes(p);
} catch (RepositoryException e) {
// ignore, probably does not exist anymore
}
return null;
}
}