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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.SearchParseException;
import org.elasticsearch.search.aggregations.Aggregator;
import org.elasticsearch.search.aggregations.AggregatorFactory;
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 org.elasticsearch.search.internal.SearchContext;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
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) {
scriptService.executable(initScript, ScriptContext.Standard.AGGS, context.searchContext(), Collections.emptyMap()).run();
}
this.mapScript = scriptService.search(context.searchContext().lookup(), mapScript, ScriptContext.Standard.AGGS, Collections.emptyMap());
if (combineScript != null) {
this.combineScript = scriptService.executable(combineScript, ScriptContext.Standard.AGGS, context.searchContext(), 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());
}
public static class Factory extends AggregatorFactory {
private Script initScript;
private Script mapScript;
private Script combineScript;
private Script reduceScript;
private Map<String, Object> params;
public Factory(String name, Script initScript, Script mapScript, Script combineScript, Script reduceScript,
Map<String, Object> params) {
super(name, InternalScriptedMetric.TYPE.name());
this.initScript = initScript;
this.mapScript = mapScript;
this.combineScript = combineScript;
this.reduceScript = reduceScript;
this.params = params;
}
@Override
public Aggregator createInternal(AggregationContext context, Aggregator parent, boolean collectsFromSingleBucket,
List<PipelineAggregator> pipelineAggregators, Map<String, Object> metaData) throws IOException {
if (collectsFromSingleBucket == false) {
return asMultiBucketAggregator(this, context, parent);
}
Map<String, Object> params = this.params;
if (params != null) {
params = deepCopyParams(params, context.searchContext());
} else {
params = new HashMap<>();
params.put("_agg", new HashMap<String, Object>());
}
return new ScriptedMetricAggregator(name, insertParams(initScript, params), insertParams(mapScript, params), insertParams(
combineScript, params), deepCopyScript(reduceScript, context.searchContext()), params, context, parent, pipelineAggregators,
metaData);
}
private static Script insertParams(Script script, Map<String, Object> params) {
if (script == null) {
return null;
}
return new Script(script.getScript(), script.getType(), script.getLang(), params);
}
private static Script deepCopyScript(Script script, SearchContext context) {
if (script != null) {
Map<String, Object> params = script.getParams();
if (params != null) {
params = deepCopyParams(params, context);
}
return new Script(script.getScript(), script.getType(), script.getLang(), params);
} else {
return null;
}
}
@SuppressWarnings({ "unchecked" })
private static <T> T deepCopyParams(T original, SearchContext context) {
T clone;
if (original instanceof Map) {
Map<?, ?> originalMap = (Map<?, ?>) original;
Map<Object, Object> clonedMap = new HashMap<>();
for (Entry<?, ?> e : originalMap.entrySet()) {
clonedMap.put(deepCopyParams(e.getKey(), context), deepCopyParams(e.getValue(), context));
}
clone = (T) clonedMap;
} else if (original instanceof List) {
List<?> originalList = (List<?>) original;
List<Object> clonedList = new ArrayList<Object>();
for (Object o : originalList) {
clonedList.add(deepCopyParams(o, context));
}
clone = (T) clonedList;
} else if (original instanceof String || original instanceof Integer || original instanceof Long || original instanceof Short
|| original instanceof Byte || original instanceof Float || original instanceof Double || original instanceof Character
|| original instanceof Boolean) {
clone = original;
} else {
throw new SearchParseException(context, "Can only clone primitives, String, ArrayList, and HashMap. Found: "
+ original.getClass().getCanonicalName(), null);
}
return clone;
}
}
}
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