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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.pipeline.bucketmetrics.min;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.search.aggregations.AggregatorFactory;
import org.elasticsearch.search.aggregations.InternalAggregation;
import org.elasticsearch.search.aggregations.InternalAggregation.Type;
import org.elasticsearch.search.aggregations.pipeline.BucketHelpers.GapPolicy;
import org.elasticsearch.search.aggregations.pipeline.PipelineAggregator;
import org.elasticsearch.search.aggregations.pipeline.PipelineAggregatorFactory;
import org.elasticsearch.search.aggregations.pipeline.PipelineAggregatorStreams;
import org.elasticsearch.search.aggregations.pipeline.bucketmetrics.BucketMetricsPipelineAggregator;
import org.elasticsearch.search.aggregations.pipeline.bucketmetrics.InternalBucketMetricValue;
import org.elasticsearch.search.aggregations.support.format.ValueFormatter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;
public class MinBucketPipelineAggregator extends BucketMetricsPipelineAggregator {
public final static Type TYPE = new Type("min_bucket");
public final static PipelineAggregatorStreams.Stream STREAM = new PipelineAggregatorStreams.Stream() {
@Override
public MinBucketPipelineAggregator readResult(StreamInput in) throws IOException {
MinBucketPipelineAggregator result = new MinBucketPipelineAggregator();
result.readFrom(in);
return result;
}
};
public static void registerStreams() {
PipelineAggregatorStreams.registerStream(STREAM, TYPE.stream());
}
private List<String> minBucketKeys;
private double minValue;
private MinBucketPipelineAggregator() {
}
protected MinBucketPipelineAggregator(String name, String[] bucketsPaths, GapPolicy gapPolicy, ValueFormatter formatter,
Map<String, Object> metaData) {
super(name, bucketsPaths, gapPolicy, formatter, metaData);
}
@Override
public Type type() {
return TYPE;
}
@Override
protected void preCollection() {
minBucketKeys = new ArrayList<>();
minValue = Double.POSITIVE_INFINITY;
}
@Override
protected void collectBucketValue(String bucketKey, Double bucketValue) {
if (bucketValue < minValue) {
minBucketKeys.clear();
minBucketKeys.add(bucketKey);
minValue = bucketValue;
} else if (bucketValue.equals(minValue)) {
minBucketKeys.add(bucketKey);
}
}
@Override
protected InternalAggregation buildAggregation(java.util.List<PipelineAggregator> pipelineAggregators,
java.util.Map<String, Object> metadata) {
String[] keys = minBucketKeys.toArray(new String[minBucketKeys.size()]);
return new InternalBucketMetricValue(name(), keys, minValue, formatter, Collections.EMPTY_LIST, metaData());
};
public static class Factory extends PipelineAggregatorFactory {
private final ValueFormatter formatter;
private final GapPolicy gapPolicy;
public Factory(String name, String[] bucketsPaths, GapPolicy gapPolicy, ValueFormatter formatter) {
super(name, TYPE.name(), bucketsPaths);
this.gapPolicy = gapPolicy;
this.formatter = formatter;
}
@Override
protected PipelineAggregator createInternal(Map<String, Object> metaData) throws IOException {
return new MinBucketPipelineAggregator(name, bucketsPaths, gapPolicy, formatter, metaData);
}
@Override
public void doValidate(AggregatorFactory parent, AggregatorFactory[] aggFactories,
List<PipelineAggregatorFactory> pipelineAggregatorFactories) {
if (bucketsPaths.length != 1) {
throw new IllegalStateException(PipelineAggregator.Parser.BUCKETS_PATH.getPreferredName()
+ " must contain a single entry for aggregation [" + name + "]");
}
}
}
}