/*
* 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.ScoreNode;
import org.apache.jackrabbit.core.query.lucene.MultiColumnQueryHits;
import org.apache.jackrabbit.core.HierarchyManager;
import org.apache.jackrabbit.spi.Path;
import org.apache.jackrabbit.spi.Name;
import org.apache.jackrabbit.spi.commons.name.PathBuilder;
/**
* <code>AncestorPathNodeJoin</code> implements an ancestor path node join
* condition.
*/
public class AncestorPathNodeJoin extends AbstractCondition {
/**
* A score node map with the score nodes from the inner query hits, indexed
* by the path of the inner query hits.
*/
private final ScoreNodeMap contextIndex = new ScoreNodeMap();
/**
* The hierarchy manager.
*/
private final HierarchyManager hmgr;
/**
* The relative path from the outer to the inner query hits.
*/
private final Path relPath;
/**
* Creates an ancestor path node join.
*
* @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 of the workspace.
* @throws IOException if an error occurs while reading from the index.
*/
public AncestorPathNodeJoin(MultiColumnQueryHits context,
Name contextSelectorName,
Path relPath,
HierarchyManager hmgr) throws IOException {
super(context);
this.hmgr = hmgr;
this.relPath = relPath;
int idx = getIndex(context, contextSelectorName);
ScoreNode[] nodes;
while ((nodes = context.nextScoreNodes()) != null) {
try {
Path p = hmgr.getPath(nodes[idx].getNodeId());
contextIndex.addScoreNodes(p, nodes);
} catch (RepositoryException e) {
// ignore
}
}
}
/**
* {@inheritDoc}
* <p>
* The outer query hits loop contains the ancestor nodes.
*/
public ScoreNode[][] getMatchingScoreNodes(ScoreNode ancestor)
throws IOException {
try {
Path ancestorPath = hmgr.getPath(ancestor.getNodeId());
PathBuilder builder = new PathBuilder(ancestorPath);
builder.addAll(relPath.getElements());
return contextIndex.getScoreNodes(builder.getPath().getNormalizedPath());
} catch (RepositoryException e) {
// ignore, probably does not exist anymore
return null;
}
}
}