org.apache.lucene.search.PositiveScoresOnlyCollector.java Source code

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Here is the source code for org.apache.lucene.search.PositiveScoresOnlyCollector.java

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/*
 * 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.lucene.search;

import java.io.IOException;

import org.apache.lucene.index.LeafReaderContext;

/**
 * A {@link Collector} implementation which wraps another
 * {@link Collector} and makes sure only documents with
 * scores > 0 are collected.
 */
public class PositiveScoresOnlyCollector extends FilterCollector {

    public PositiveScoresOnlyCollector(Collector in) {
        super(in);
    }

    @Override
    public LeafCollector getLeafCollector(LeafReaderContext context) throws IOException {
        return new FilterLeafCollector(super.getLeafCollector(context)) {

            private Scorable scorer;

            @Override
            public void setScorer(Scorable scorer) throws IOException {
                this.scorer = new ScoreCachingWrappingScorer(scorer);
                in.setScorer(this.scorer);
            }

            @Override
            public void collect(int doc) throws IOException {
                if (scorer.score() > 0) {
                    in.collect(doc);
                }
            }

        };
    }

}