org.elasticsearch.search.aggregations.support.ValueSourceAggregatorFactory Maven / Gradle / Ivy
/*
* 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.support;
import org.elasticsearch.search.aggregations.*;
/**
*
*/
public abstract class ValueSourceAggregatorFactory extends AggregatorFactory implements ValuesSourceBased {
public static abstract class LeafOnly extends ValueSourceAggregatorFactory {
protected LeafOnly(String name, String type, ValuesSourceConfig valuesSourceConfig) {
super(name, type, valuesSourceConfig);
}
@Override
public AggregatorFactory subFactories(AggregatorFactories subFactories) {
throw new AggregationInitializationException("Aggregator [" + name + "] of type [" + type + "] cannot accept sub-aggregations");
}
}
protected ValuesSourceConfig valuesSourceConfig;
protected ValueSourceAggregatorFactory(String name, String type, ValuesSourceConfig valuesSourceConfig) {
super(name, type);
this.valuesSourceConfig = valuesSourceConfig;
}
@Override
public ValuesSourceConfig valuesSourceConfig() {
return valuesSourceConfig;
}
@Override
public Aggregator create(AggregationContext context, Aggregator parent, long expectedBucketsCount) {
if (valuesSourceConfig.unmapped()) {
return createUnmapped(context, parent);
}
VS vs = context.valuesSource(valuesSourceConfig, parent == null ? 0 : 1 + parent.depth());
return create(vs, expectedBucketsCount, context, parent);
}
@Override
public void doValidate() {
if (valuesSourceConfig == null || !valuesSourceConfig.valid()) {
valuesSourceConfig = resolveValuesSourceConfigFromAncestors(name, parent, valuesSourceConfig.valueSourceType());
}
}
protected abstract Aggregator createUnmapped(AggregationContext aggregationContext, Aggregator parent);
protected abstract Aggregator create(VS valuesSource, long expectedBucketsCount, AggregationContext aggregationContext, Aggregator parent);
private static ValuesSourceConfig resolveValuesSourceConfigFromAncestors(String aggName, AggregatorFactory parent, Class requiredValuesSourceType) {
ValuesSourceConfig config;
while (parent != null) {
if (parent instanceof ValuesSourceBased) {
config = ((ValuesSourceBased) parent).valuesSourceConfig();
if (config != null && config.valid()) {
if (requiredValuesSourceType == null || requiredValuesSourceType.isAssignableFrom(config.valueSourceType())) {
return (ValuesSourceConfig) config;
}
}
}
parent = parent.parent();
}
throw new AggregationExecutionException("could not find the appropriate value context to perform aggregation [" + aggName + "]");
}
}