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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.pipeline.bucketscript;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.io.stream.StreamOutput;
import org.elasticsearch.script.ExecutableScript;
import org.elasticsearch.script.Script;
import org.elasticsearch.script.ScriptContext;
import org.elasticsearch.search.DocValueFormat;
import org.elasticsearch.search.aggregations.AggregationExecutionException;
import org.elasticsearch.search.aggregations.InternalAggregation;
import org.elasticsearch.search.aggregations.InternalAggregation.ReduceContext;
import org.elasticsearch.search.aggregations.InternalAggregations;
import org.elasticsearch.search.aggregations.InternalMultiBucketAggregation;
import org.elasticsearch.search.aggregations.pipeline.BucketHelpers.GapPolicy;
import org.elasticsearch.search.aggregations.pipeline.InternalSimpleValue;
import org.elasticsearch.search.aggregations.pipeline.PipelineAggregator;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;
import java.util.stream.StreamSupport;
import static org.elasticsearch.search.aggregations.pipeline.BucketHelpers.resolveBucketValue;
public class BucketScriptPipelineAggregator extends PipelineAggregator {
private final DocValueFormat formatter;
private final GapPolicy gapPolicy;
private final Script script;
private final Map<String, String> bucketsPathsMap;
public BucketScriptPipelineAggregator(String name, Map<String, String> bucketsPathsMap, Script script, DocValueFormat formatter,
GapPolicy gapPolicy, Map<String, Object> metadata) {
super(name, bucketsPathsMap.values().toArray(new String[bucketsPathsMap.size()]), metadata);
this.bucketsPathsMap = bucketsPathsMap;
this.script = script;
this.formatter = formatter;
this.gapPolicy = gapPolicy;
}
/**
* Read from a stream.
*/
@SuppressWarnings("unchecked")
public BucketScriptPipelineAggregator(StreamInput in) throws IOException {
super(in);
script = new Script(in);
formatter = in.readNamedWriteable(DocValueFormat.class);
gapPolicy = GapPolicy.readFrom(in);
bucketsPathsMap = (Map<String, String>) in.readGenericValue();
}
@Override
protected void doWriteTo(StreamOutput out) throws IOException {
script.writeTo(out);
out.writeNamedWriteable(formatter);
gapPolicy.writeTo(out);
out.writeGenericValue(bucketsPathsMap);
}
@Override
public String getWriteableName() {
return BucketScriptPipelineAggregationBuilder.NAME;
}
@Override
public InternalAggregation reduce(InternalAggregation aggregation, ReduceContext reduceContext) {
InternalMultiBucketAggregation<InternalMultiBucketAggregation, InternalMultiBucketAggregation.InternalBucket> originalAgg =
(InternalMultiBucketAggregation<InternalMultiBucketAggregation, InternalMultiBucketAggregation.InternalBucket>) aggregation;
List<? extends InternalMultiBucketAggregation.InternalBucket> buckets = originalAgg.getBuckets();
ExecutableScript.Compiled compiledScript = reduceContext.scriptService().compile(script, ScriptContext.AGGS_EXECUTABLE);
List<InternalMultiBucketAggregation.InternalBucket> newBuckets = new ArrayList<>();
for (InternalMultiBucketAggregation.InternalBucket bucket : buckets) {
Map<String, Object> vars = new HashMap<>();
if (script.getParams() != null) {
vars.putAll(script.getParams());
}
boolean skipBucket = false;
for (Map.Entry<String, String> entry : bucketsPathsMap.entrySet()) {
String varName = entry.getKey();
String bucketsPath = entry.getValue();
Double value = resolveBucketValue(originalAgg, bucket, bucketsPath, gapPolicy);
if (GapPolicy.SKIP == gapPolicy && (value == null || Double.isNaN(value))) {
skipBucket = true;
break;
}
vars.put(varName, value);
}
if (skipBucket) {
newBuckets.add(bucket);
} else {
ExecutableScript executableScript = compiledScript.newInstance(vars);
Object returned = executableScript.run();
if (returned == null) {
newBuckets.add(bucket);
} else {
if (!(returned instanceof Number)) {
throw new AggregationExecutionException("series_arithmetic script for reducer [" + name()
+ "] must return a Number");
}
final List<InternalAggregation> aggs = StreamSupport.stream(bucket.getAggregations().spliterator(), false).map(
(p) -> (InternalAggregation) p).collect(Collectors.toList());
aggs.add(new InternalSimpleValue(name(), ((Number) returned).doubleValue(), formatter,
new ArrayList<>(), metaData()));
InternalMultiBucketAggregation.InternalBucket newBucket = originalAgg.createBucket(new InternalAggregations(aggs),
bucket);
newBuckets.add(newBucket);
}
}
}
return originalAgg.create(newBuckets);
}
}
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