org.elasticsearch.search.aggregations.AggregationBuilder 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.ParseField;
import org.elasticsearch.common.Strings;
import org.elasticsearch.common.io.stream.NamedWriteable;
import org.elasticsearch.common.xcontent.ToXContentFragment;
import org.elasticsearch.common.xcontent.XContentParser;
import org.elasticsearch.index.query.QueryRewriteContext;
import org.elasticsearch.index.query.QueryShardContext;
import java.io.IOException;
import java.util.Collection;
import java.util.Map;
/**
* A factory that knows how to create an {@link Aggregator} of a specific type.
*/
public abstract class AggregationBuilder
implements NamedWriteable, ToXContentFragment, BaseAggregationBuilder {
protected final String name;
protected AggregatorFactories.Builder factoriesBuilder = AggregatorFactories.builder();
/**
* Constructs a new aggregation builder.
*
* @param name The aggregation name
*/
protected AggregationBuilder(String name) {
if (name == null) {
throw new IllegalArgumentException("[name] must not be null: [" + name + "]");
}
this.name = name;
}
protected AggregationBuilder(AggregationBuilder clone, AggregatorFactories.Builder factoriesBuilder) {
this.name = clone.name;
this.factoriesBuilder = factoriesBuilder;
}
/** 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(QueryShardContext queryShardContext, AggregatorFactory parent) throws IOException;
/** Associate metadata with this {@link AggregationBuilder}. */
@Override
public abstract AggregationBuilder setMetaData(Map metaData);
/** Return any associated metadata with this {@link AggregationBuilder}. */
public abstract Map getMetaData();
/** 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);
/** Return the configured set of subaggregations **/
public Collection getSubAggregations() {
return factoriesBuilder.getAggregatorFactories();
}
/** Return the configured set of pipeline aggregations **/
public Collection getPipelineAggregations() {
return factoriesBuilder.getPipelineAggregatorFactories();
}
/**
* 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 AggregatorFactories#parseAggregators(XContentParser)}.
*
* @param subFactories
* The sub-factories
* @return this factory (fluent interface)
*/
@Override
public abstract AggregationBuilder subAggregations(AggregatorFactories.Builder subFactories);
/**
* Create a shallow copy of this builder and replacing {@link #factoriesBuilder} and metaData
.
* Used by {@link #rewrite(QueryRewriteContext)}.
*/
protected abstract AggregationBuilder shallowCopy(AggregatorFactories.Builder factoriesBuilder, Map metaData);
public final AggregationBuilder rewrite(QueryRewriteContext context) throws IOException {
AggregationBuilder rewritten = doRewrite(context);
AggregatorFactories.Builder rewrittenSubAggs = factoriesBuilder.rewrite(context);
if (rewritten != this) {
return rewritten.setMetaData(getMetaData()).subAggregations(rewrittenSubAggs);
} else if (rewrittenSubAggs != factoriesBuilder) {
return shallowCopy(rewrittenSubAggs, getMetaData());
} else {
return this;
}
}
/**
* Rewrites this aggregation builder into its primitive form. By default
* this method return the builder itself. If the builder did not change the
* identity reference must be returned otherwise the builder will be
* rewritten infinitely.
*/
protected AggregationBuilder doRewrite(QueryRewriteContext queryShardContext) throws IOException {
return this;
}
/**
* Rewrites the given aggregation into its primitive form. Aggregations that for instance fetch resources from remote hosts or
* can simplify / optimize itself should do their heavy lifting during {@link #rewrite(QueryRewriteContext)}. This method
* rewrites the aggregation until it doesn't change anymore.
* @throws IOException if an {@link IOException} occurs
*/
static AggregationBuilder rewriteAggregation(AggregationBuilder original, QueryRewriteContext context) throws IOException {
AggregationBuilder builder = original;
for (AggregationBuilder rewrittenBuilder = builder.rewrite(context); rewrittenBuilder != builder;
rewrittenBuilder = builder.rewrite(context)) {
builder = rewrittenBuilder;
}
return builder;
}
/** 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");
}
@Override
public String toString() {
return Strings.toString(this);
}
}