/*
 * Licensed to CRATE Technology GmbH ("Crate") under one or more contributor
 * license agreements.  See the NOTICE file distributed with this work for
 * additional information regarding copyright ownership.  Crate 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.
 *
 * However, if you have executed another commercial license agreement
 * with Crate these terms will supersede the license and you may use the
 * software solely pursuant to the terms of the relevant commercial agreement.
 */

package io.crate.operation.reference.doc.lucene;

import io.crate.metadata.doc.DocSysColumns;
import org.apache.lucene.search.Scorer;

import java.io.IOException;

public class ScoreCollectorExpression extends LuceneCollectorExpression<Float> {

    public static final String COLUMN_NAME = DocSysColumns.SCORE.name();

    private Scorer scorer;
    private float score;

    public ScoreCollectorExpression() {
        super(COLUMN_NAME);
    }

    @Override
    public void setScorer(Scorer scorer) {
        this.scorer = scorer;
    }

    @Override
    public Float value() {
        return score;
    }

    @Override
    public void setNextDocId(int doc) {
        if (scorer == null) {
            return;
        }
        try {
            score = scorer.score();
        } catch (IOException e) {
            score = 1.0f;
        }
    }
}