org.elasticsearch.search.aggregations.InternalAggregations Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of elasticsearch Show documentation
Show all versions of elasticsearch Show documentation
Elasticsearch subproject :server
/*
* 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;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.io.stream.StreamOutput;
import org.elasticsearch.common.io.stream.Streamable;
import org.elasticsearch.common.xcontent.ToXContent;
import org.elasticsearch.common.xcontent.XContentBuilder;
import org.elasticsearch.search.aggregations.InternalAggregation.ReduceContext;
import org.elasticsearch.search.aggregations.support.AggregationPath;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;
import static java.util.Collections.emptyMap;
import static java.util.Collections.unmodifiableMap;
/**
* An internal implementation of {@link Aggregations}.
*/
public class InternalAggregations implements Aggregations, ToXContent, Streamable {
public static final InternalAggregations EMPTY = new InternalAggregations();
private List aggregations = Collections.emptyList();
private Map aggregationsAsMap;
private InternalAggregations() {
}
/**
* Constructs a new addAggregation.
*/
public InternalAggregations(List aggregations) {
this.aggregations = aggregations;
}
/**
* Iterates over the {@link Aggregation}s.
*/
@Override
public Iterator iterator() {
return aggregations.stream().map((p) -> (Aggregation) p).iterator();
}
/**
* The list of {@link Aggregation}s.
*/
@Override
public List asList() {
return aggregations.stream().map((p) -> (Aggregation) p).collect(Collectors.toList());
}
/**
* Returns the {@link Aggregation}s keyed by map.
*/
@Override
public Map asMap() {
return getAsMap();
}
/**
* Returns the {@link Aggregation}s keyed by map.
*/
@Override
public Map getAsMap() {
if (aggregationsAsMap == null) {
Map newAggregationsAsMap = new HashMap<>();
for (InternalAggregation aggregation : aggregations) {
newAggregationsAsMap.put(aggregation.getName(), aggregation);
}
this.aggregationsAsMap = unmodifiableMap(newAggregationsAsMap);
}
return aggregationsAsMap;
}
/**
* @return the aggregation of the specified name.
*/
@SuppressWarnings("unchecked")
@Override
public A get(String name) {
return (A) asMap().get(name);
}
@Override
public Object getProperty(String path) {
AggregationPath aggPath = AggregationPath.parse(path);
return getProperty(aggPath.getPathElementsAsStringList());
}
public Object getProperty(List path) {
if (path.isEmpty()) {
return this;
}
String aggName = path.get(0);
InternalAggregation aggregation = get(aggName);
if (aggregation == null) {
throw new IllegalArgumentException("Cannot find an aggregation named [" + aggName + "]");
}
return aggregation.getProperty(path.subList(1, path.size()));
}
/**
* Reduces the given lists of addAggregation.
*
* @param aggregationsList A list of aggregation to reduce
* @return The reduced addAggregation
*/
public static InternalAggregations reduce(List aggregationsList, ReduceContext context) {
if (aggregationsList.isEmpty()) {
return null;
}
// first we collect all aggregations of the same type and list them together
Map> aggByName = new HashMap<>();
for (InternalAggregations aggregations : aggregationsList) {
for (InternalAggregation aggregation : aggregations.aggregations) {
List aggs = aggByName.get(aggregation.getName());
if (aggs == null) {
aggs = new ArrayList<>(aggregationsList.size());
aggByName.put(aggregation.getName(), aggs);
}
aggs.add(aggregation);
}
}
// now we can use the first aggregation of each list to handle the reduce of its list
List reducedAggregations = new ArrayList<>();
for (Map.Entry> entry : aggByName.entrySet()) {
List aggregations = entry.getValue();
InternalAggregation first = aggregations.get(0); // the list can't be empty as it's created on demand
reducedAggregations.add(first.reduce(aggregations, context));
}
return new InternalAggregations(reducedAggregations);
}
/** The fields required to write this addAggregation to xcontent */
static class Fields {
public static final String AGGREGATIONS = "aggregations";
}
@Override
public XContentBuilder toXContent(XContentBuilder builder, Params params) throws IOException {
if (aggregations.isEmpty()) {
return builder;
}
builder.startObject(Fields.AGGREGATIONS);
toXContentInternal(builder, params);
return builder.endObject();
}
/**
* Directly write all the addAggregation without their bounding object. Used by sub-addAggregation (non top level addAggregation)
*/
public XContentBuilder toXContentInternal(XContentBuilder builder, Params params) throws IOException {
for (Aggregation aggregation : aggregations) {
((InternalAggregation) aggregation).toXContent(builder, params);
}
return builder;
}
public static InternalAggregations readAggregations(StreamInput in) throws IOException {
InternalAggregations result = new InternalAggregations();
result.readFrom(in);
return result;
}
public static InternalAggregations readOptionalAggregations(StreamInput in) throws IOException {
return in.readOptionalStreamable(InternalAggregations::new);
}
@Override
public void readFrom(StreamInput in) throws IOException {
aggregations = in.readList(stream -> in.readNamedWriteable(InternalAggregation.class));
if (aggregations.isEmpty()) {
aggregationsAsMap = emptyMap();
}
}
@Override
public void writeTo(StreamOutput out) throws IOException {
out.writeNamedWriteableList(aggregations);
}
}