org.elasticsearch.index.mapper.UidAndSourceFieldSelector Maven / Gradle / Ivy

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Elasticsearch subproject :server

There is a newer version: 8.15.1

/*
 * Licensed to Elastic Search and Shay Banon under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. Elastic Search 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.mapper;

import org.apache.lucene.document.FieldSelector;
import org.apache.lucene.document.FieldSelectorResult;

/**
 * An optimized field selector that loads just the uid and the source.
 *
 * @author kimchy (shay.banon)
 */
public class UidAndSourceFieldSelector implements FieldSelector {

    private int match = 0;

    @Override public FieldSelectorResult accept(String fieldName) {
        if (UidFieldMapper.NAME.equals(fieldName)) {
            if (++match == 2) {
                match = 0;
                return FieldSelectorResult.LOAD_AND_BREAK;
            }
            return FieldSelectorResult.LOAD;
        }
        if (SourceFieldMapper.NAME.equals(fieldName)) {
            if (++match == 2) {
                match = 0;
                return FieldSelectorResult.LOAD_AND_BREAK;
            }
            return FieldSelectorResult.LOAD;
        }
        return FieldSelectorResult.NO_LOAD;
    }
}