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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.scripted;
import org.apache.lucene.index.LeafReaderContext;
import org.elasticsearch.script.ExecutableScript;
import org.elasticsearch.script.LeafSearchScript;
import org.elasticsearch.script.Script;
import org.elasticsearch.script.ScriptContext;
import org.elasticsearch.script.ScriptService;
import org.elasticsearch.script.SearchScript;
import org.elasticsearch.search.aggregations.Aggregator;
import org.elasticsearch.search.aggregations.InternalAggregation;
import org.elasticsearch.search.aggregations.LeafBucketCollector;
import org.elasticsearch.search.aggregations.LeafBucketCollectorBase;
import org.elasticsearch.search.aggregations.metrics.MetricsAggregator;
import org.elasticsearch.search.aggregations.pipeline.PipelineAggregator;
import org.elasticsearch.search.aggregations.support.AggregationContext;
import java.io.IOException;
import java.util.Collections;
import java.util.List;
import java.util.Map;
public class ScriptedMetricAggregator extends MetricsAggregator {
private final SearchScript mapScript;
private final ExecutableScript combineScript;
private final Script reduceScript;
private Map<String, Object> params;
protected ScriptedMetricAggregator(String name, Script initScript, Script mapScript, Script combineScript, Script reduceScript,
Map<String, Object> params, AggregationContext context, Aggregator parent, List<PipelineAggregator> pipelineAggregators, Map<String, Object> metaData)
throws IOException {
super(name, context, parent, pipelineAggregators, metaData);
this.params = params;
ScriptService scriptService = context.searchContext().scriptService();
if (initScript != null) {
context.searchContext().markAsNotCachable();
scriptService.executable(initScript, ScriptContext.Standard.AGGS, Collections.emptyMap()).run();
}
this.mapScript = scriptService.search(context.searchContext().lookup(), mapScript, ScriptContext.Standard.AGGS, Collections.emptyMap());
if (combineScript != null) {
context.searchContext().markAsNotCachable();
this.combineScript = scriptService.executable(combineScript, ScriptContext.Standard.AGGS, Collections.emptyMap());
} else {
this.combineScript = null;
}
this.reduceScript = reduceScript;
}
@Override
public boolean needsScores() {
return true; // TODO: how can we know if the script relies on scores?
}
@Override
public LeafBucketCollector getLeafCollector(LeafReaderContext ctx,
final LeafBucketCollector sub) throws IOException {
final LeafSearchScript leafMapScript = mapScript.getLeafSearchScript(ctx);
return new LeafBucketCollectorBase(sub, mapScript) {
@Override
public void collect(int doc, long bucket) throws IOException {
assert bucket == 0 : bucket;
leafMapScript.setDocument(doc);
leafMapScript.run();
}
};
}
@Override
public InternalAggregation buildAggregation(long owningBucketOrdinal) {
Object aggregation;
if (combineScript != null) {
aggregation = combineScript.run();
} else {
aggregation = params.get("_agg");
}
return new InternalScriptedMetric(name, aggregation, reduceScript, pipelineAggregators(),
metaData());
}
@Override
public InternalAggregation buildEmptyAggregation() {
return new InternalScriptedMetric(name, null, reduceScript, pipelineAggregators(), metaData());
}
}
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