/*
* 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.solr.search.similarities;
import java.io.IOException;
import org.apache.lucene.index.FieldInvertState;
import org.apache.lucene.index.LeafReaderContext;
import org.apache.lucene.search.CollectionStatistics;
import org.apache.lucene.search.TermStatistics;
import org.apache.lucene.search.similarities.Similarity;
import org.apache.lucene.util.BytesRef;
import org.apache.solr.util.PayloadDecoder;
/**
* The computation Lucene's PayloadScoreQuery uses is SimScorer#computePayloadFactor.
* This wrapper delegates to a main similarity except for this one method.
*/
public class PayloadScoringSimilarityWrapper extends Similarity {
private Similarity delegate;
private PayloadDecoder decoder;
public PayloadScoringSimilarityWrapper(Similarity delegate, PayloadDecoder decoder) {
this.delegate = delegate;
this.decoder = decoder;
}
@Override
public String toString() {
return "PayloadScoring(" + delegate.toString() + ", decoder=" + decoder.toString() + ")";
}
@Override
public long computeNorm(FieldInvertState state) {
return delegate.computeNorm(state);
}
@Override
public SimWeight computeWeight(float boost, CollectionStatistics collectionStats, TermStatistics... termStats) {
return delegate.computeWeight(boost, collectionStats, termStats);
}
@Override
public SimScorer simScorer(SimWeight weight, LeafReaderContext context) throws IOException {
final SimScorer simScorer = delegate.simScorer(weight,context);
SimScorer payloadSimScorer = new SimScorer() {
@Override
public float score(int doc, float freq) throws IOException {
return simScorer.score(doc,freq);
}
@Override
public float computeSlopFactor(int distance) {
return simScorer.computeSlopFactor(distance);
}
@Override
public float computePayloadFactor(int doc, int start, int end, BytesRef payload) {
return decoder.decode(doc, start, end, payload);
}
};
return payloadSimScorer;
}
}