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Elasticsearch - Open Source, Distributed, RESTful Search Engine
/*
* 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.DelegatingHasContextAndHeaders;
import org.elasticsearch.common.HasContextAndHeaders;
import org.elasticsearch.common.bytes.BytesArray;
import org.elasticsearch.common.bytes.BytesReference;
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.util.BigArrays;
import org.elasticsearch.common.xcontent.ToXContent;
import org.elasticsearch.common.xcontent.XContentBuilder;
import org.elasticsearch.common.xcontent.XContentBuilderString;
import org.elasticsearch.script.ScriptService;
import org.elasticsearch.search.aggregations.pipeline.PipelineAggregator;
import org.elasticsearch.search.aggregations.pipeline.PipelineAggregatorStreams;
import org.elasticsearch.search.aggregations.support.AggregationPath;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;
/**
* An internal implementation of {@link Aggregation}. Serves as a base class for all aggregation implementations.
*/
public abstract class InternalAggregation implements Aggregation, ToXContent, Streamable {
/**
* The aggregation type that holds all the string types that are associated with an aggregation:
*
* - name - used as the parser type
* - stream - used as the stream type
*
*/
public static class Type {
private String name;
private BytesReference stream;
public Type(String name) {
this(name, new BytesArray(name));
}
public Type(String name, String stream) {
this(name, new BytesArray(stream));
}
public Type(String name, BytesReference stream) {
this.name = name;
this.stream = stream;
}
/**
* @return The name of the type (mainly used for registering the parser for the aggregator (see {@link org.elasticsearch.search.aggregations.Aggregator.Parser#type()}).
*/
public String name() {
return name;
}
/**
* @return The name of the stream type (used for registering the aggregation stream
* (see {@link AggregationStreams#registerStream(AggregationStreams.Stream, org.elasticsearch.common.bytes.BytesReference...)}).
*/
public BytesReference stream() {
return stream;
}
@Override
public String toString() {
return name;
}
}
public static class ReduceContext extends DelegatingHasContextAndHeaders {
private final BigArrays bigArrays;
private ScriptService scriptService;
public ReduceContext(BigArrays bigArrays, ScriptService scriptService, HasContextAndHeaders headersContext) {
super(headersContext);
this.bigArrays = bigArrays;
this.scriptService = scriptService;
}
public BigArrays bigArrays() {
return bigArrays;
}
public ScriptService scriptService() {
return scriptService;
}
}
protected String name;
protected Map metaData;
private List pipelineAggregators;
/** Constructs an un initialized addAggregation (used for serialization) **/
protected InternalAggregation() {}
/**
* Constructs an get with a given name.
*
* @param name The name of the get.
*/
protected InternalAggregation(String name, List pipelineAggregators, Map metaData) {
this.name = name;
this.pipelineAggregators = pipelineAggregators;
this.metaData = metaData;
}
@Override
public String getName() {
return name;
}
/**
* @return The {@link Type} of this aggregation
*/
public abstract Type type();
/**
* Reduces the given addAggregation to a single one and returns it. In most cases, the assumption will be the all given
* addAggregation are of the same type (the same type as this aggregation). For best efficiency, when implementing,
* try reusing an existing get instance (typically the first in the given list) to save on redundant object
* construction.
*/
public final InternalAggregation reduce(List aggregations, ReduceContext reduceContext) {
InternalAggregation aggResult = doReduce(aggregations, reduceContext);
for (PipelineAggregator pipelineAggregator : pipelineAggregators) {
aggResult = pipelineAggregator.reduce(aggResult, reduceContext);
}
return aggResult;
}
public abstract InternalAggregation doReduce(List aggregations, ReduceContext reduceContext);
@Override
public Object getProperty(String path) {
AggregationPath aggPath = AggregationPath.parse(path);
return getProperty(aggPath.getPathElementsAsStringList());
}
public abstract Object getProperty(List path);
/**
* Read a size under the assumption that a value of 0 means unlimited.
*/
protected static int readSize(StreamInput in) throws IOException {
final int size = in.readVInt();
return size == 0 ? Integer.MAX_VALUE : size;
}
/**
* Write a size under the assumption that a value of 0 means unlimited.
*/
protected static void writeSize(int size, StreamOutput out) throws IOException {
if (size == Integer.MAX_VALUE) {
size = 0;
}
out.writeVInt(size);
}
@Override
public Map getMetaData() {
return metaData;
}
public List pipelineAggregators() {
return pipelineAggregators;
}
@Override
public final XContentBuilder toXContent(XContentBuilder builder, Params params) throws IOException {
builder.startObject(name);
if (this.metaData != null) {
builder.field(CommonFields.META);
builder.map(this.metaData);
}
doXContentBody(builder, params);
builder.endObject();
return builder;
}
public abstract XContentBuilder doXContentBody(XContentBuilder builder, Params params) throws IOException;
@Override
public final void writeTo(StreamOutput out) throws IOException {
out.writeString(name);
out.writeGenericValue(metaData);
out.writeVInt(pipelineAggregators.size());
for (PipelineAggregator pipelineAggregator : pipelineAggregators) {
out.writeBytesReference(pipelineAggregator.type().stream());
pipelineAggregator.writeTo(out);
}
doWriteTo(out);
}
protected abstract void doWriteTo(StreamOutput out) throws IOException;
@Override
public final void readFrom(StreamInput in) throws IOException {
name = in.readString();
metaData = in.readMap();
int size = in.readVInt();
if (size == 0) {
pipelineAggregators = Collections.emptyList();
} else {
pipelineAggregators = new ArrayList<>(size);
for (int i = 0; i < size; i++) {
BytesReference type = in.readBytesReference();
PipelineAggregator pipelineAggregator = PipelineAggregatorStreams.stream(type).readResult(in);
pipelineAggregators.add(pipelineAggregator);
}
}
doReadFrom(in);
}
protected abstract void doReadFrom(StreamInput in) throws IOException;
/**
* Common xcontent fields that are shared among addAggregation
*/
public static final class CommonFields {
public static final XContentBuilderString META = new XContentBuilderString("meta");
public static final XContentBuilderString BUCKETS = new XContentBuilderString("buckets");
public static final XContentBuilderString VALUE = new XContentBuilderString("value");
public static final XContentBuilderString VALUES = new XContentBuilderString("values");
public static final XContentBuilderString VALUE_AS_STRING = new XContentBuilderString("value_as_string");
public static final XContentBuilderString DOC_COUNT = new XContentBuilderString("doc_count");
public static final XContentBuilderString KEY = new XContentBuilderString("key");
public static final XContentBuilderString KEY_AS_STRING = new XContentBuilderString("key_as_string");
public static final XContentBuilderString FROM = new XContentBuilderString("from");
public static final XContentBuilderString FROM_AS_STRING = new XContentBuilderString("from_as_string");
public static final XContentBuilderString TO = new XContentBuilderString("to");
public static final XContentBuilderString TO_AS_STRING = new XContentBuilderString("to_as_string");
}
}