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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.ExecutableScript;
import org.elasticsearch.script.Script;
import org.elasticsearch.script.ScriptContext;
import org.elasticsearch.search.aggregations.InternalAggregation;
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;
import java.util.Objects;
public class InternalScriptedMetric extends InternalAggregation implements ScriptedMetric {
private final Script reduceScript;
private final List<Object> aggregation;
public InternalScriptedMetric(String name, Object aggregation, Script reduceScript, List<PipelineAggregator> pipelineAggregators,
Map<String, Object> metaData) {
this(name, Collections.singletonList(aggregation), reduceScript, pipelineAggregators, metaData);
}
private InternalScriptedMetric(String name, List<Object> aggregation, Script reduceScript, List<PipelineAggregator> pipelineAggregators,
Map<String, Object> metaData) {
super(name, pipelineAggregators, metaData);
this.aggregation = aggregation;
this.reduceScript = reduceScript;
}
/**
* Read from a stream.
*/
public InternalScriptedMetric(StreamInput in) throws IOException {
super(in);
reduceScript = in.readOptionalWriteable(Script::new);
aggregation = Collections.singletonList(in.readGenericValue());
}
@Override
protected void doWriteTo(StreamOutput out) throws IOException {
out.writeOptionalWriteable(reduceScript);
out.writeGenericValue(aggregation());
}
@Override
public String getWriteableName() {
return ScriptedMetricAggregationBuilder.NAME;
}
@Override
public Object aggregation() {
if (aggregation.size() != 1) {
throw new IllegalStateException("aggregation was not reduced");
}
return aggregation.get(0);
}
@Override
public InternalAggregation doReduce(List<InternalAggregation> aggregations, ReduceContext reduceContext) {
List<Object> aggregationObjects = new ArrayList<>();
for (InternalAggregation aggregation : aggregations) {
InternalScriptedMetric mapReduceAggregation = (InternalScriptedMetric) aggregation;
aggregationObjects.addAll(mapReduceAggregation.aggregation);
}
InternalScriptedMetric firstAggregation = ((InternalScriptedMetric) aggregations.get(0));
List<Object> aggregation;
if (firstAggregation.reduceScript != null && reduceContext.isFinalReduce()) {
Map<String, Object> vars = new HashMap<>();
vars.put("_aggs", aggregationObjects);
if (firstAggregation.reduceScript.getParams() != null) {
vars.putAll(firstAggregation.reduceScript.getParams());
}
ExecutableScript.Compiled compiled = reduceContext.scriptService().compile(
firstAggregation.reduceScript, ExecutableScript.AGGS_CONTEXT);
ExecutableScript script = compiled.newInstance(vars);
aggregation = Collections.singletonList(script.run());
} else if (reduceContext.isFinalReduce()) {
aggregation = Collections.singletonList(aggregationObjects);
} else {
// if we are not an final reduce we have to maintain all the aggs from all the incoming one
// until we hit the final reduce phase.
aggregation = aggregationObjects;
}
return new InternalScriptedMetric(firstAggregation.getName(), aggregation, firstAggregation.reduceScript, pipelineAggregators(),
getMetaData());
}
@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
public XContentBuilder doXContentBody(XContentBuilder builder, Params params) throws IOException {
return builder.field(CommonFields.VALUE.getPreferredName(), aggregation());
}
@Override
protected boolean doEquals(Object obj) {
InternalScriptedMetric other = (InternalScriptedMetric) obj;
return Objects.equals(reduceScript, other.reduceScript) &&
Objects.equals(aggregation, other.aggregation);
}
@Override
protected int doHashCode() {
return Objects.hash(reduceScript, aggregation);
}
}
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