/*
* 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 org.apache.jackrabbit.core.query.lucene.MultiColumnQueryHits;
import org.apache.jackrabbit.core.query.lucene.ScoreNode;
import org.apache.jackrabbit.spi.Name;
import org.apache.lucene.index.IndexReader;
/**
* <code>SameNodeJoin</code> implements a same node join condition.
*/
public class SameNodeJoin extends AbstractCondition {
/**
* A score node map with the score nodes from the inner query hits, indexed
* by their document number.
*/
private final ScoreNodeMap innerIndex = new ScoreNodeMap();
/**
* The index reader.
*/
private final IndexReader reader;
/**
* Creates a new same node join.
*
* @param inner the inner query hits.
* @param innerSelectorName the selector name for the inner query hits.
* @param reader the index reader.
* @throws IOException if an error occurs while reading from the index.
*/
public SameNodeJoin(MultiColumnQueryHits inner,
Name innerSelectorName,
IndexReader reader) throws IOException {
super(inner);
this.reader = reader;
int idx = getIndex(inner, innerSelectorName);
ScoreNode[] nodes;
while ((nodes = inner.nextScoreNodes()) != null) {
innerIndex.addScoreNodes(nodes[idx].getDoc(reader), nodes);
}
}
/**
* {@inheritDoc}
*/
public ScoreNode[][] getMatchingScoreNodes(ScoreNode outer)
throws IOException {
return innerIndex.getScoreNodes(outer.getDoc(reader));
}
}