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ScriptScoreFunction.java
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ScriptScoreFunction.java
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/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch 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.function;
import org.apache.lucene.index.AtomicReaderContext;
import org.apache.lucene.search.Explanation;
import org.apache.lucene.search.Scorer;
import org.elasticsearch.script.SearchScript;
import java.io.IOException;
import java.util.Map;
public class ScriptScoreFunction extends ScoreFunction {
static final class CannedScorer extends Scorer {
protected int docid;
protected float score;
public CannedScorer() {
super(null);
}
@Override
public int docID() {
return docid;
}
@Override
public float score() throws IOException {
return score;
}
@Override
public int freq() throws IOException {
throw new UnsupportedOperationException();
}
@Override
public int nextDoc() throws IOException {
throw new UnsupportedOperationException();
}
@Override
public int advance(int target) throws IOException {
throw new UnsupportedOperationException();
}
@Override
public long cost() {
return 1;
}
}
private final String sScript;
private final Map<String, Object> params;
private final CannedScorer scorer;
private final SearchScript script;
public ScriptScoreFunction(String sScript, Map<String, Object> params, SearchScript script) {
super(CombineFunction.REPLACE);
this.sScript = sScript;
this.params = params;
this.script = script;
this.scorer = new CannedScorer();
script.setScorer(scorer);
}
@Override
public void setNextReader(AtomicReaderContext ctx) {
script.setNextReader(ctx);
}
@Override
public double score(int docId, float subQueryScore) {
script.setNextDocId(docId);
scorer.docid = docId;
scorer.score = subQueryScore;
return script.runAsDouble();
}
@Override
public Explanation explainScore(int docId, float subQueryScore) {
Explanation exp;
double score = score(docId, subQueryScore);
String explanation = "script score function, computed with script:\"" + sScript;
if (params != null) {
explanation += "\" and parameters: \n" + params.toString();
}
exp = new Explanation(CombineFunction.toFloat(score), explanation);
return exp;
}
@Override
public String toString() {
return "script[" + sScript + "], params [" + params + "]";
}
}