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LimitFilter.java
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LimitFilter.java
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/*
* Licensed to Elastic Search and Shay Banon under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. Elastic Search 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.elasticsearch.common.lucene.search;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.search.DocIdSet;
import org.elasticsearch.common.lucene.docset.GetDocSet;
import java.io.IOException;
public class LimitFilter extends NoCacheFilter {
private final int limit;
public LimitFilter(int limit) {
this.limit = limit;
}
public int getLimit() {
return limit;
}
@Override public DocIdSet getDocIdSet(IndexReader reader) throws IOException {
return new LimitDocSet(reader.maxDoc(), limit);
}
public static class LimitDocSet extends GetDocSet {
private final int limit;
private int counter;
public LimitDocSet(int maxDoc, int limit) {
super(maxDoc);
this.limit = limit;
}
@Override public boolean get(int doc) throws IOException {
if (++counter > limit) {
return false;
}
return true;
}
}
}