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* 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.
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package org.elasticsearch.search.aggregations.metrics.scripted;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.io.stream.StreamOutput;
import org.elasticsearch.common.xcontent.XContentBuilder;
import org.elasticsearch.script.ExecutableScript;
import org.elasticsearch.script.ScriptService.ScriptType;
import org.elasticsearch.search.aggregations.AggregationStreams;
import org.elasticsearch.search.aggregations.InternalAggregation;
import org.elasticsearch.search.aggregations.metrics.InternalMetricsAggregation;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
public class InternalScriptedMetric extends InternalMetricsAggregation implements ScriptedMetric {
public final static Type TYPE = new Type("scripted_metric");
public final static AggregationStreams.Stream STREAM = new AggregationStreams.Stream() {
@Override
public InternalScriptedMetric readResult(StreamInput in) throws IOException {
InternalScriptedMetric result = new InternalScriptedMetric();
result.readFrom(in);
return result;
}
};
public static void registerStreams() {
AggregationStreams.registerStream(STREAM, TYPE.stream());
}
private String scriptLang;
private ScriptType scriptType;
private String reduceScript;
private Map<String, Object> reduceParams;
private Object aggregation;
private InternalScriptedMetric() {
}
private InternalScriptedMetric(String name, Map<String, Object> metaData) {
super(name, metaData);
}
public InternalScriptedMetric(String name, Object aggregation, String scriptLang, ScriptType scriptType, String reduceScript,
Map<String, Object> reduceParams, Map<String, Object> metaData) {
this(name, metaData);
this.aggregation = aggregation;
this.scriptType = scriptType;
this.reduceScript = reduceScript;
this.reduceParams = reduceParams;
this.scriptLang = scriptLang;
}
@Override
public Object aggregation() {
return aggregation;
}
@Override
public InternalAggregation reduce(ReduceContext reduceContext) {
List<Object> aggregationObjects = new ArrayList<>();
for (InternalAggregation aggregation : reduceContext.aggregations()) {
InternalScriptedMetric mapReduceAggregation = (InternalScriptedMetric) aggregation;
aggregationObjects.add(mapReduceAggregation.aggregation());
}
InternalScriptedMetric firstAggregation = ((InternalScriptedMetric) reduceContext.aggregations().get(0));
Object aggregation;
if (firstAggregation.reduceScript != null) {
Map<String, Object> params;
if (firstAggregation.reduceParams != null) {
params = new HashMap<String, Object>(firstAggregation.reduceParams);
} else {
params = new HashMap<String, Object>();
}
params.put("_aggs", aggregationObjects);
ExecutableScript script = reduceContext.scriptService().executable(firstAggregation.scriptLang, firstAggregation.reduceScript,
firstAggregation.scriptType, params);
aggregation = script.run();
} else {
aggregation = aggregationObjects;
}
return new InternalScriptedMetric(firstAggregation.getName(), aggregation, firstAggregation.scriptLang, firstAggregation.scriptType,
firstAggregation.reduceScript, firstAggregation.reduceParams, getMetaData());
}
@Override
public Type type() {
return TYPE;
}
@Override
protected void doReadFrom(StreamInput in) throws IOException {
scriptLang = in.readOptionalString();
scriptType = ScriptType.readFrom(in);
reduceScript = in.readOptionalString();
reduceParams = in.readMap();
aggregation = in.readGenericValue();
}
@Override
protected void doWriteTo(StreamOutput out) throws IOException {
out.writeOptionalString(scriptLang);
ScriptType.writeTo(scriptType, out);
out.writeOptionalString(reduceScript);
out.writeMap(reduceParams);
out.writeGenericValue(aggregation);
}
@Override
public XContentBuilder doXContentBody(XContentBuilder builder, Params params) throws IOException {
return builder.field("value", aggregation);
}
}