org.elasticsearch.search.fetch.version.VersionFetchSubPhase Maven / Gradle / Ivy
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*
* http://www.apache.org/licenses/LICENSE-2.0
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package org.elasticsearch.search.fetch.version;
import com.google.common.collect.ImmutableMap;
import org.apache.lucene.index.Term;
import org.elasticsearch.ElasticsearchException;
import org.elasticsearch.common.lucene.uid.Versions;
import org.elasticsearch.index.mapper.internal.UidFieldMapper;
import org.elasticsearch.search.SearchParseElement;
import org.elasticsearch.search.fetch.FetchSubPhase;
import org.elasticsearch.search.internal.InternalSearchHit;
import org.elasticsearch.search.internal.SearchContext;
import java.io.IOException;
import java.util.Map;
/**
*
*/
public class VersionFetchSubPhase implements FetchSubPhase {
@Override
public Map parseElements() {
return ImmutableMap.of("version", new VersionParseElement());
}
@Override
public boolean hitsExecutionNeeded(SearchContext context) {
return false;
}
@Override
public void hitsExecute(SearchContext context, InternalSearchHit[] hits) throws ElasticsearchException {
}
@Override
public boolean hitExecutionNeeded(SearchContext context) {
return context.version();
}
@Override
public void hitExecute(SearchContext context, HitContext hitContext) throws ElasticsearchException {
// it might make sense to cache the TermDocs on a shared fetch context and just skip here)
// it is going to mean we work on the high level multi reader and not the lower level reader as is
// the case below...
long version;
try {
version = Versions.loadVersion(
hitContext.readerContext().reader(),
new Term(UidFieldMapper.NAME, hitContext.fieldVisitor().uid().toBytesRef())
);
} catch (IOException e) {
throw new ElasticsearchException("Could not query index for _version", e);
}
if (version < 0) {
version = -1;
}
hitContext.hit().version(version);
}
}