/*
* Licensed 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 com.facebook.presto.operator.aggregation;
import com.facebook.presto.spi.type.Type;
import com.google.common.collect.ImmutableList;
import java.util.List;
import java.util.Optional;
import static com.google.common.base.Preconditions.checkArgument;
import static java.util.Objects.requireNonNull;
public final class InternalAggregationFunction
{
private final String name;
private final List<Type> parameterTypes;
private final Type intermediateType;
private final Type finalType;
private final boolean decomposable;
private final AccumulatorFactoryBinder factory;
public InternalAggregationFunction(String name, List<Type> parameterTypes, Type intermediateType, Type finalType, boolean decomposable, AccumulatorFactoryBinder factory)
{
this.name = requireNonNull(name, "name is null");
checkArgument(!name.isEmpty(), "name is empty");
this.parameterTypes = ImmutableList.copyOf(requireNonNull(parameterTypes, "parameterTypes is null"));
this.intermediateType = requireNonNull(intermediateType, "intermediateType is null");
this.finalType = requireNonNull(finalType, "finalType is null");
this.decomposable = decomposable;
this.factory = requireNonNull(factory, "factory is null");
}
public String name()
{
return name;
}
public List<Type> getParameterTypes()
{
return parameterTypes;
}
public Type getFinalType()
{
return finalType;
}
public Type getIntermediateType()
{
return intermediateType;
}
/**
* Indicates that the aggregation can be decomposed, and run as partial aggregations followed by a final aggregation to combine the intermediate results
*/
public boolean isDecomposable()
{
return decomposable;
}
public AccumulatorFactory bind(List<Integer> inputChannels, Optional<Integer> maskChannel)
{
return factory.bind(inputChannels, maskChannel);
}
}