/*
* 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.metadata.FunctionFactory;
import com.facebook.presto.metadata.FunctionListBuilder;
import com.facebook.presto.metadata.ParametricFunction;
import com.facebook.presto.spi.type.TypeManager;
import com.google.common.collect.ImmutableList;
import java.util.List;
import static com.google.common.base.Preconditions.checkNotNull;
public class GenericAggregationFunctionFactory
implements FunctionFactory
{
private final List<ParametricFunction> aggregations;
public static GenericAggregationFunctionFactory fromAggregationDefinition(Class<?> clazz, TypeManager typeManager)
{
FunctionListBuilder builder = new FunctionListBuilder(typeManager);
for (InternalAggregationFunction aggregation : new AggregationCompiler(typeManager).generateAggregationFunctions(clazz)) {
builder.aggregate(aggregation);
}
return new GenericAggregationFunctionFactory(builder.getFunctions());
}
private GenericAggregationFunctionFactory(List<ParametricFunction> aggregations)
{
this.aggregations = ImmutableList.copyOf(checkNotNull(aggregations, "aggregations is null"));
}
@Override
public List<ParametricFunction> listFunctions()
{
return aggregations;
}
}