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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.aggregations.metrics.tophits;
import org.elasticsearch.script.ScriptContext;
import org.elasticsearch.script.SearchScript;
import org.elasticsearch.search.aggregations.Aggregator;
import org.elasticsearch.search.aggregations.AggregatorFactories;
import org.elasticsearch.search.aggregations.AggregatorFactory;
import org.elasticsearch.search.aggregations.InternalAggregation.Type;
import org.elasticsearch.search.aggregations.pipeline.PipelineAggregator;
import org.elasticsearch.search.aggregations.support.AggregationContext;
import org.elasticsearch.search.builder.SearchSourceBuilder.ScriptField;
import org.elasticsearch.search.fetch.docvalues.DocValueFieldsContext;
import org.elasticsearch.search.fetch.docvalues.DocValueFieldsContext.DocValueField;
import org.elasticsearch.search.fetch.docvalues.DocValueFieldsFetchSubPhase;
import org.elasticsearch.search.fetch.source.FetchSourceContext;
import org.elasticsearch.search.highlight.HighlightBuilder;
import org.elasticsearch.search.internal.SubSearchContext;
import org.elasticsearch.search.sort.SortAndFormats;
import org.elasticsearch.search.sort.SortBuilder;
import java.io.IOException;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.Set;
public class TopHitsAggregatorFactory extends AggregatorFactory<TopHitsAggregatorFactory> {
private final int from;
private final int size;
private final boolean explain;
private final boolean version;
private final boolean trackScores;
private final List<SortBuilder<?>> sorts;
private final HighlightBuilder highlightBuilder;
private final List<String> fieldNames;
private final List<String> docValueFields;
private final Set<ScriptField> scriptFields;
private final FetchSourceContext fetchSourceContext;
public TopHitsAggregatorFactory(String name, Type type, int from, int size, boolean explain, boolean version, boolean trackScores,
List<SortBuilder<?>> sorts, HighlightBuilder highlightBuilder, List<String> fieldNames, List<String> docValueFields,
Set<ScriptField> scriptFields, FetchSourceContext fetchSourceContext, AggregationContext context, AggregatorFactory<?> parent,
AggregatorFactories.Builder subFactories, Map<String, Object> metaData) throws IOException {
super(name, type, context, parent, subFactories, metaData);
this.from = from;
this.size = size;
this.explain = explain;
this.version = version;
this.trackScores = trackScores;
this.sorts = sorts;
this.highlightBuilder = highlightBuilder;
this.fieldNames = fieldNames;
this.docValueFields = docValueFields;
this.scriptFields = scriptFields;
this.fetchSourceContext = fetchSourceContext;
}
@Override
public Aggregator createInternal(Aggregator parent, boolean collectsFromSingleBucket, List<PipelineAggregator> pipelineAggregators,
Map<String, Object> metaData) throws IOException {
SubSearchContext subSearchContext = new SubSearchContext(context.searchContext());
subSearchContext.parsedQuery(context.searchContext().parsedQuery());
subSearchContext.explain(explain);
subSearchContext.version(version);
subSearchContext.trackScores(trackScores);
subSearchContext.from(from);
subSearchContext.size(size);
if (sorts != null) {
Optional<SortAndFormats> optionalSort = SortBuilder.buildSort(sorts, subSearchContext.getQueryShardContext());
if (optionalSort.isPresent()) {
subSearchContext.sort(optionalSort.get());
}
}
if (fieldNames != null) {
subSearchContext.fieldNames().addAll(fieldNames);
}
if (docValueFields != null) {
DocValueFieldsContext docValueFieldsContext = subSearchContext
.getFetchSubPhaseContext(DocValueFieldsFetchSubPhase.CONTEXT_FACTORY);
for (String field : docValueFields) {
docValueFieldsContext.add(new DocValueField(field));
}
docValueFieldsContext.setHitExecutionNeeded(true);
}
if (scriptFields != null) {
for (ScriptField field : scriptFields) {
SearchScript searchScript = subSearchContext.scriptService().search(subSearchContext.lookup(), field.script(),
ScriptContext.Standard.SEARCH, Collections.emptyMap());
subSearchContext.scriptFields().add(new org.elasticsearch.search.fetch.script.ScriptFieldsContext.ScriptField(
field.fieldName(), searchScript, field.ignoreFailure()));
}
}
if (fetchSourceContext != null) {
subSearchContext.fetchSourceContext(fetchSourceContext);
}
if (highlightBuilder != null) {
subSearchContext.highlight(highlightBuilder.build(context.searchContext().getQueryShardContext()));
}
return new TopHitsAggregator(context.searchContext().fetchPhase(), subSearchContext, name, context, parent,
pipelineAggregators, metaData);
}
}
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