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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;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.io.stream.StreamOutput;
import org.elasticsearch.common.xcontent.XContentBuilder;
import org.elasticsearch.search.internal.SearchContext;
import java.io.IOException;
import java.util.Collections;
import java.util.Map;
import java.util.Objects;
/**
* Base implementation of a {@link AggregationBuilder}.
*/
public abstract class AbstractAggregationBuilder<AB extends AbstractAggregationBuilder<AB>>
extends AggregationBuilder {
protected Map<String, Object> metaData;
/**
* Constructs a new aggregation builder.
*
* @param name The aggregation name
*/
public AbstractAggregationBuilder(String name) {
super(name);
}
/**
* Read from a stream.
*/
protected AbstractAggregationBuilder(StreamInput in) throws IOException {
super(in.readString());
factoriesBuilder = new AggregatorFactories.Builder(in);
metaData = in.readMap();
}
@Override
public final void writeTo(StreamOutput out) throws IOException {
out.writeString(name);
factoriesBuilder.writeTo(out);
out.writeMap(metaData);
doWriteTo(out);
}
protected abstract void doWriteTo(StreamOutput out) throws IOException;
@SuppressWarnings("unchecked")
@Override
public AB subAggregation(AggregationBuilder aggregation) {
if (aggregation == null) {
throw new IllegalArgumentException("[aggregation] must not be null: [" + name + "]");
}
factoriesBuilder.addAggregator(aggregation);
return (AB) this;
}
/**
* Add a sub aggregation to this aggregation.
*/
@SuppressWarnings("unchecked")
@Override
public AB subAggregation(PipelineAggregationBuilder aggregation) {
if (aggregation == null) {
throw new IllegalArgumentException("[aggregation] must not be null: [" + name + "]");
}
factoriesBuilder.addPipelineAggregator(aggregation);
return (AB) this;
}
/**
* Registers sub-factories with this factory. The sub-factory will be
* responsible for the creation of sub-aggregators under the aggregator
* created by this factory.
*
* @param subFactories
* The sub-factories
* @return this factory (fluent interface)
*/
@SuppressWarnings("unchecked")
@Override
public AB subAggregations(AggregatorFactories.Builder subFactories) {
if (subFactories == null) {
throw new IllegalArgumentException("[subFactories] must not be null: [" + name + "]");
}
this.factoriesBuilder = subFactories;
return (AB) this;
}
@SuppressWarnings("unchecked")
@Override
public AB setMetaData(Map<String, Object> metaData) {
if (metaData == null) {
throw new IllegalArgumentException("[metaData] must not be null: [" + name + "]");
}
this.metaData = metaData;
return (AB) this;
}
@Override
public Map<String, Object> getMetaData() {
return Collections.unmodifiableMap(metaData);
}
@Override
public final String getWriteableName() {
// We always use the type of the aggregation as the writeable name
return getType();
}
@Override
public final AggregatorFactory<?> build(SearchContext context, AggregatorFactory<?> parent) throws IOException {
AggregatorFactory<?> factory = doBuild(context, parent, factoriesBuilder);
return factory;
}
protected abstract AggregatorFactory<?> doBuild(SearchContext context, AggregatorFactory<?> parent,
AggregatorFactories.Builder subfactoriesBuilder) throws IOException;
@Override
public final XContentBuilder toXContent(XContentBuilder builder, Params params) throws IOException {
builder.startObject(name);
if (this.metaData != null) {
builder.field("meta", this.metaData);
}
builder.field(getType());
internalXContent(builder, params);
if (factoriesBuilder != null && (factoriesBuilder.count()) > 0) {
builder.field("aggregations");
factoriesBuilder.toXContent(builder, params);
}
return builder.endObject();
}
protected abstract XContentBuilder internalXContent(XContentBuilder builder, Params params) throws IOException;
@Override
public int hashCode() {
return Objects.hash(factoriesBuilder, metaData, name, doHashCode());
}
protected abstract int doHashCode();
@Override
public boolean equals(Object obj) {
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
@SuppressWarnings("unchecked")
AbstractAggregationBuilder<AB> other = (AbstractAggregationBuilder<AB>) obj;
if (!Objects.equals(name, other.name))
return false;
if (!Objects.equals(metaData, other.metaData))
return false;
if (!Objects.equals(factoriesBuilder, other.factoriesBuilder))
return false;
return doEquals(obj);
}
protected abstract boolean doEquals(Object obj);
}
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