/*
* 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.PostingsEnum;
import org.apache.lucene.search.similarities.Similarity;
/** Expert: A <code>Scorer</code> for documents matching a <code>Term</code>.
*/
final class TermScorer extends Scorer {
private final PostingsEnum postingsEnum;
private final Similarity.SimScorer docScorer;
/**
* Construct a <code>TermScorer</code>.
*
* @param weight
* The weight of the <code>Term</code> in the query.
* @param td
* An iterator over the documents matching the <code>Term</code>.
* @param docScorer
* The <code>Similarity.SimScorer</code> implementation
* to be used for score computations.
*/
TermScorer(Weight weight, PostingsEnum td, Similarity.SimScorer docScorer) {
super(weight);
this.docScorer = docScorer;
this.postingsEnum = td;
}
@Override
public int docID() {
return postingsEnum.docID();
}
@Override
public int freq() throws IOException {
return postingsEnum.freq();
}
@Override
public DocIdSetIterator iterator() {
return postingsEnum;
}
@Override
public float score() throws IOException {
assert docID() != DocIdSetIterator.NO_MORE_DOCS;
return docScorer.score(postingsEnum.docID(), postingsEnum.freq());
}
/** Returns a string representation of this <code>TermScorer</code>. */
@Override
public String toString() { return "scorer(" + weight + ")[" + super.toString() + "]"; }
}