/*
* 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.expressions;
import java.io.IOException;
import org.apache.lucene.queries.function.FunctionValues;
import org.apache.lucene.queries.function.ValueSource;
import org.apache.lucene.queries.function.docvalues.DoubleDocValues;
import org.apache.lucene.search.Scorer;
/**
* A utility class to allow expressions to access the score as a {@link FunctionValues}.
*/
class ScoreFunctionValues extends DoubleDocValues {
final Scorer scorer;
ScoreFunctionValues(ValueSource parent, Scorer scorer) {
super(parent);
this.scorer = scorer;
}
@Override
public double doubleVal(int document) {
try {
assert document == scorer.docID();
return scorer.score();
} catch (IOException exception) {
throw new RuntimeException(exception);
}
}
}