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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.action.support.ToXContentToBytes;
import org.elasticsearch.common.ParseField;
import org.elasticsearch.common.io.stream.NamedWriteable;
import org.elasticsearch.common.xcontent.ToXContent;
import org.elasticsearch.search.aggregations.InternalAggregation.Type;
import org.elasticsearch.search.aggregations.support.AggregationContext;
import java.io.IOException;
import java.util.Map;
/**
* A factory that knows how to create an {@link Aggregator} of a specific type.
*/
public abstract class AggregationBuilder
extends ToXContentToBytes
implements NamedWriteable, ToXContent {
protected final String name;
protected final Type type;
protected AggregatorFactories.Builder factoriesBuilder = AggregatorFactories.builder();
/**
* Constructs a new aggregation builder.
*
* @param name The aggregation name
* @param type The aggregation type
*/
protected AggregationBuilder(String name, Type type) {
if (name == null) {
throw new IllegalArgumentException("[name] must not be null: [" + name + "]");
}
if (type == null) {
throw new IllegalArgumentException("[type] must not be null: [" + name + "]");
}
this.name = name;
this.type = type;
}
/** Return this aggregation's name. */
public String getName() {
return name;
}
/** Internal: build an {@link AggregatorFactory} based on the configuration of this builder. */
protected abstract AggregatorFactory build(AggregationContext context, AggregatorFactory parent) throws IOException;
/** Associate metadata with this {@link AggregationBuilder}. */
public abstract AggregationBuilder setMetaData(Map metaData);
/** Add a sub aggregation to this builder. */
public abstract AggregationBuilder subAggregation(AggregationBuilder aggregation);
/** Add a sub aggregation to this builder. */
public abstract AggregationBuilder subAggregation(PipelineAggregationBuilder aggregation);
/**
* Internal: 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. This is only for use by {@link AggregatorParsers}.
*
* @param subFactories
* The sub-factories
* @return this factory (fluent interface)
*/
protected abstract AggregationBuilder subAggregations(AggregatorFactories.Builder subFactories);
/** Common xcontent fields shared among aggregator builders */
public static final class CommonFields extends ParseField.CommonFields {
public static final ParseField VALUE_TYPE = new ParseField("value_type");
}
}