PositiveScoresOnlyCollector.cs

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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.
 */

using System;

using IndexReader = Lucene.Net.Index.IndexReader;

namespace Lucene.Net.Search
{
    
    public class PositiveScoresOnlyCollector:Collector
    {
        
        private Collector c;
        private Scorer scorer;
        
        public PositiveScoresOnlyCollector(Collector c)
        {
            this.c = c;
        }
        
        public override void  Collect(int doc)
        {
            if (scorer.Score() > 0)
            {
                c.Collect(doc);
            }
        }
        
        public override void  SetNextReader(IndexReader reader, int docBase)
        {
            c.SetNextReader(reader, docBase);
        }
        
        public override void  SetScorer(Scorer scorer)
        {
            // Set a ScoreCachingWrappingScorer in case the wrapped Collector will call
            // score() also.
            this.scorer = new ScoreCachingWrappingScorer(scorer);
            c.SetScorer(this.scorer);
        }

        public override bool AcceptsDocsOutOfOrder
        {
            get { return c.AcceptsDocsOutOfOrder; }
        }
    }
}