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Elasticsearch subproject :server
/*
* Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
* or more contributor license agreements. Licensed under the Elastic License
* 2.0 and the Server Side Public License, v 1; you may not use this file except
* in compliance with, at your election, the Elastic License 2.0 or the Server
* Side Public License, v 1.
*/
package org.elasticsearch.search.aggregations.pipeline;
import org.elasticsearch.search.aggregations.AggregationReduceContext;
import org.elasticsearch.search.aggregations.InternalAggregation;
import org.elasticsearch.search.aggregations.PipelineAggregationBuilder;
import org.elasticsearch.xcontent.ParseField;
import org.elasticsearch.xcontent.XContentParser;
import java.io.IOException;
import java.util.List;
import java.util.Map;
import static java.util.Collections.emptyList;
import static java.util.Collections.emptyMap;
public abstract class PipelineAggregator {
/**
* Parse the {@link PipelineAggregationBuilder} from a {@link XContentParser}.
*/
@FunctionalInterface
public interface Parser {
ParseField BUCKETS_PATH = new ParseField("buckets_path");
ParseField FORMAT = new ParseField("format");
ParseField GAP_POLICY = new ParseField("gap_policy");
/**
* Returns the pipeline aggregator factory with which this parser is
* associated.
*
* @param pipelineAggregatorName
* The name of the pipeline aggregation
* @param parser the parser
* @return The resolved pipeline aggregator factory
* @throws java.io.IOException
* When parsing fails
*/
PipelineAggregationBuilder parse(String pipelineAggregatorName, XContentParser parser) throws IOException;
}
/**
* Tree of {@link PipelineAggregator}s to modify a tree of aggregations
* after their final reduction.
*/
public static class PipelineTree {
/**
* An empty tree of {@link PipelineAggregator}s.
*/
public static final PipelineTree EMPTY = new PipelineTree(emptyMap(), emptyList());
private final Map subTrees;
private final List aggregators;
public PipelineTree(Map subTrees, List aggregators) {
this.subTrees = subTrees;
this.aggregators = aggregators;
}
/**
* The {@link PipelineAggregator}s for the aggregation at this
* position in the tree.
*/
public List aggregators() {
return aggregators;
}
/**
* Get the sub-tree at for the named sub-aggregation or {@link #EMPTY}
* if there are no pipeline aggragations for that sub-aggregator.
*/
public PipelineTree subTree(String name) {
return subTrees.getOrDefault(name, EMPTY);
}
/**
* Return {@code true} if this node in the tree has any subtrees.
*/
public boolean hasSubTrees() {
return false == subTrees.isEmpty();
}
@Override
public String toString() {
return "PipelineTree[" + aggregators + "," + subTrees + "]";
}
}
private String name;
private String[] bucketsPaths;
private Map metadata;
protected PipelineAggregator(String name, String[] bucketsPaths, Map metadata) {
this.name = name;
this.bucketsPaths = bucketsPaths;
this.metadata = metadata;
}
public String name() {
return name;
}
public String[] bucketsPaths() {
return bucketsPaths;
}
public Map metadata() {
return metadata;
}
public abstract InternalAggregation reduce(InternalAggregation aggregation, AggregationReduceContext reduceContext);
}