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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.index.search.child;
import org.apache.lucene.search.DocIdSetIterator;
import org.apache.lucene.search.Scorer;
import org.apache.lucene.search.Weight;
import org.apache.lucene.util.BytesRef;
import java.io.IOException;
/**
* A scorer that wraps a {@link DocIdSetIterator} and emits a constant score.
*/
// Borrowed from ConstantScoreQuery
public class ConstantScorer extends Scorer {
public static ConstantScorer create(DocIdSetIterator iterator, Weight weight, float constantScore) throws IOException {
return new ConstantScorer(iterator, weight, constantScore);
}
private final DocIdSetIterator docIdSetIterator;
private final float constantScore;
private ConstantScorer(DocIdSetIterator docIdSetIterator, Weight w, float constantScore) {
super(w);
this.constantScore = constantScore;
this.docIdSetIterator = docIdSetIterator;
}
@Override
public DocIdSetIterator iterator() {
return docIdSetIterator;
}
@Override
public int docID() {
return docIdSetIterator.docID();
}
@Override
public float score() throws IOException {
assert docIdSetIterator.docID() != DocIdSetIterator.NO_MORE_DOCS;
return constantScore;
}
@Override
public int freq() throws IOException {
return 1;
}
}