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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.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.io.stream.StreamOutput;
import org.elasticsearch.common.xcontent.XContentBuilder;
import org.elasticsearch.script.CompiledScript;
import org.elasticsearch.script.ExecutableScript;
import org.elasticsearch.script.Script;
import org.elasticsearch.script.ScriptContext;
import org.elasticsearch.search.aggregations.AggregationStreams;
import org.elasticsearch.search.aggregations.InternalAggregation;
import org.elasticsearch.search.aggregations.metrics.InternalMetricsAggregation;
import org.elasticsearch.search.aggregations.pipeline.PipelineAggregator;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
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 Script reduceScript;
private Object aggregation;
private InternalScriptedMetric() {
}
private InternalScriptedMetric(String name, List<PipelineAggregator> pipelineAggregators, Map<String, Object> metaData) {
super(name, pipelineAggregators, metaData);
}
public InternalScriptedMetric(String name, Object aggregation, Script reduceScript, List<PipelineAggregator> pipelineAggregators, Map<String, Object> metaData) {
this(name, pipelineAggregators, metaData);
this.aggregation = aggregation;
this.reduceScript = reduceScript;
}
@Override
public Object aggregation() {
return aggregation;
}
@Override
public InternalAggregation doReduce(List<InternalAggregation> aggregations, ReduceContext reduceContext) {
List<Object> aggregationObjects = new ArrayList<>();
for (InternalAggregation aggregation : aggregations) {
InternalScriptedMetric mapReduceAggregation = (InternalScriptedMetric) aggregation;
aggregationObjects.add(mapReduceAggregation.aggregation());
}
InternalScriptedMetric firstAggregation = ((InternalScriptedMetric) aggregations.get(0));
Object aggregation;
if (firstAggregation.reduceScript != null) {
Map<String, Object> vars = new HashMap<>();
vars.put("_aggs", aggregationObjects);
if (firstAggregation.reduceScript.getParams() != null) {
vars.putAll(firstAggregation.reduceScript.getParams());
}
CompiledScript compiledScript = reduceContext.scriptService().compile(firstAggregation.reduceScript,
ScriptContext.Standard.AGGS, Collections.emptyMap());
ExecutableScript script = reduceContext.scriptService().executable(compiledScript, vars);
aggregation = script.run();
} else {
aggregation = aggregationObjects;
}
return new InternalScriptedMetric(firstAggregation.getName(), aggregation, firstAggregation.reduceScript, pipelineAggregators(), getMetaData());
}
@Override
public Type type() {
return TYPE;
}
@Override
public Object getProperty(List<String> path) {
if (path.isEmpty()) {
return this;
} else if (path.size() == 1 && "value".equals(path.get(0))) {
return aggregation;
} else {
throw new IllegalArgumentException("path not supported for [" + getName() + "]: " + path);
}
}
@Override
protected void doReadFrom(StreamInput in) throws IOException {
if (in.readBoolean()) {
reduceScript = Script.readScript(in);
}
aggregation = in.readGenericValue();
}
@Override
protected void doWriteTo(StreamOutput out) throws IOException {
boolean hasScript = reduceScript != null;
out.writeBoolean(hasScript);
if (hasScript) {
reduceScript.writeTo(out);
}
out.writeGenericValue(aggregation);
}
@Override
public XContentBuilder doXContentBody(XContentBuilder builder, Params params) throws IOException {
return builder.field("value", aggregation);
}
}
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