/*
 * 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 java.io.IOException;

/**
 *
 */
public abstract class ScoreFunction {

    private final CombineFunction scoreCombiner;

    public abstract void setNextReader(AtomicReaderContext context);

    public abstract double score(int docId, float subQueryScore);

    public abstract Explanation explainScore(int docId, Explanation subQueryScore) throws IOException;

    public CombineFunction getDefaultScoreCombiner() {
        return scoreCombiner;
    }

    protected ScoreFunction(CombineFunction scoreCombiner) {
        this.scoreCombiner = scoreCombiner;
    }
}
