/*
* 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.exoplatform.services.jcr.impl.core.query.lucene.hits;
import java.io.IOException;
/**
* Creates the intersection of two hit sets.
*/
public class HitsIntersection implements Hits {
private final Hits hits1;
private final Hits hits2;
private int nextChildrenHit = -1;
private int nextNameTestHit = -1;
public HitsIntersection(Hits hits1, Hits hits2) {
this.hits1 = hits1;
this.hits2 = hits2;
}
/**
* {@inheritDoc}
*/
public void set(int doc) {
throw new UnsupportedOperationException();
}
/**
* {@inheritDoc}
*/
public int next() throws IOException {
do {
if (nextChildrenHit == nextNameTestHit) {
nextNameTestHit = hits2.next();
nextChildrenHit = hits1.next();
} else if (nextNameTestHit < nextChildrenHit) {
nextNameTestHit = hits2.skipTo(nextChildrenHit);
} else {
nextChildrenHit = hits1.skipTo(nextNameTestHit);
}
} while (nextChildrenHit > -1 && nextNameTestHit > -1
&& nextNameTestHit != nextChildrenHit);
int nextDoc = -1;
if (nextChildrenHit == nextNameTestHit) {
nextDoc = nextChildrenHit;
}
return nextDoc;
}
/**
* {@inheritDoc}
*/
public int skipTo(int target) throws IOException {
nextChildrenHit = hits1.skipTo(target);
nextNameTestHit = hits2.skipTo(target);
if (nextChildrenHit == nextNameTestHit) {
return nextChildrenHit;
} else {
return next();
}
}
}