org.elasticsearch.search.fetch.subphase.FetchVersionPhase Maven / Gradle / Ivy
/*
* Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
* or more contributor license agreements. Licensed under the Elastic License
* 2.0 and the Server Side Public License, v 1; you may not use this file except
* in compliance with, at your election, the Elastic License 2.0 or the Server
* Side Public License, v 1.
*/
package org.elasticsearch.search.fetch.subphase;
import org.apache.lucene.index.LeafReaderContext;
import org.apache.lucene.index.NumericDocValues;
import org.elasticsearch.common.lucene.uid.Versions;
import org.elasticsearch.index.mapper.VersionFieldMapper;
import org.elasticsearch.search.fetch.FetchContext;
import org.elasticsearch.search.fetch.FetchSubPhase;
import org.elasticsearch.search.fetch.FetchSubPhaseProcessor;
import java.io.IOException;
public final class FetchVersionPhase implements FetchSubPhase {
@Override
public FetchSubPhaseProcessor getProcessor(FetchContext context) {
if (context.version() == false) {
return null;
}
return new FetchSubPhaseProcessor() {
NumericDocValues versions = null;
@Override
public void setNextReader(LeafReaderContext readerContext) throws IOException {
versions = readerContext.reader().getNumericDocValues(VersionFieldMapper.NAME);
}
@Override
public void process(HitContext hitContext) throws IOException {
long version = Versions.NOT_FOUND;
if (versions != null && versions.advanceExact(hitContext.docId())) {
version = versions.longValue();
}
hitContext.hit().version(version < 0 ? -1 : version);
}
};
}
}