org.elasticsearch.search.fetch.explain.ExplainFetchSubPhase Maven / Gradle / Ivy
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* 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
*
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package org.elasticsearch.search.fetch.explain;
import com.google.common.collect.ImmutableMap;
import org.apache.lucene.search.Explanation;
import org.elasticsearch.ElasticsearchException;
import org.elasticsearch.search.SearchParseElement;
import org.elasticsearch.search.fetch.FetchPhaseExecutionException;
import org.elasticsearch.search.fetch.FetchSubPhase;
import org.elasticsearch.search.internal.InternalSearchHit;
import org.elasticsearch.search.internal.SearchContext;
import org.elasticsearch.search.rescore.RescoreSearchContext;
import org.elasticsearch.search.rescore.Rescorer;
import java.io.IOException;
import java.util.Map;
/**
*
*/
public class ExplainFetchSubPhase implements FetchSubPhase {
@Override
public Map parseElements() {
return ImmutableMap.of("explain", new ExplainParseElement());
}
@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.explain();
}
@Override
public void hitExecute(SearchContext context, HitContext hitContext) throws ElasticsearchException {
try {
final int topLevelDocId = hitContext.hit().docId();
Explanation explanation;
if (context.rescore() != null) {
RescoreSearchContext ctx = context.rescore();
Rescorer rescorer = ctx.rescorer();
explanation = rescorer.explain(topLevelDocId, context, ctx);
} else {
explanation = context.searcher().explain(context.query(), topLevelDocId);
}
// we use the top level doc id, since we work with the top level searcher
hitContext.hit().explanation(explanation);
} catch (IOException e) {
throw new FetchPhaseExecutionException(context, "Failed to explain doc [" + hitContext.hit().type() + "#" + hitContext.hit().id() + "]", e);
}
}
}