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* 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.search.fetch.subphase;
import org.apache.lucene.index.NumericDocValues;
import org.elasticsearch.ElasticsearchException;
import org.elasticsearch.common.lucene.uid.Versions;
import org.elasticsearch.index.mapper.VersionFieldMapper;
import org.elasticsearch.search.fetch.FetchSubPhase;
import org.elasticsearch.search.internal.SearchContext;
import java.io.IOException;
public final class VersionFetchSubPhase implements FetchSubPhase {
@Override
public void hitExecute(SearchContext context, HitContext hitContext) {
if (context.version() == false ||
(context.storedFieldsContext() != null && context.storedFieldsContext().fetchFields() == false)) {
return;
}
long version = Versions.NOT_FOUND;
try {
NumericDocValues versions = hitContext.reader().getNumericDocValues(VersionFieldMapper.NAME);
if (versions != null && versions.advanceExact(hitContext.docId())) {
version = versions.longValue();
}
} catch (IOException e) {
throw new ElasticsearchException("Could not retrieve version", e);
}
hitContext.hit().version(version < 0 ? -1 : version);
}
}