io.druid.sql.calcite.aggregation.Aggregations Maven / Gradle / Ivy
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* Licensed to Metamarkets Group Inc. (Metamarkets) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. Metamarkets 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 io.druid.sql.calcite.aggregation;
import com.google.common.base.Predicate;
import io.druid.query.aggregation.AggregatorFactory;
import io.druid.query.aggregation.FilteredAggregatorFactory;
import io.druid.query.filter.DimFilter;
public class Aggregations
{
private Aggregations()
{
// No instantiation.
}
/**
* Returns true if "factory" is an aggregator factory that either matches "predicate" (if filter is null) or is
* a filtered aggregator factory whose filter is equal to "filter" and underlying aggregator matches "predicate".
*
* @param factory factory to match
* @param filter filter, may be null
* @param clazz class of factory to match
* @param predicate predicate
*
* @return true if the aggregator matches filter + predicate
*/
public static boolean aggregatorMatches(
final AggregatorFactory factory,
final DimFilter filter,
final Class clazz,
final Predicate predicate
)
{
if (filter != null) {
return factory instanceof FilteredAggregatorFactory &&
((FilteredAggregatorFactory) factory).getFilter().equals(filter)
&& aggregatorMatches(((FilteredAggregatorFactory) factory).getAggregator(), null, clazz, predicate);
} else {
return clazz.isAssignableFrom(factory.getClass()) && predicate.apply(clazz.cast(factory));
}
}
}