/*
 * 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.hive.functions.aggregation;

import com.facebook.presto.spi.function.AccumulatorStateFactory;
import org.apache.hadoop.hive.ql.udf.generic.GenericUDAFEvaluator.AggregationBuffer;

import java.util.function.Supplier;

public class HiveAccumulatorStateFactory
        implements AccumulatorStateFactory<HiveAccumulatorState>
{
    private final Supplier<AggregationBuffer> bufferSupplier;

    public HiveAccumulatorStateFactory(Supplier<AggregationBuffer> bufferSupplier)
    {
        this.bufferSupplier = bufferSupplier;
    }

    @Override
    public HiveAccumulatorState createSingleState()
    {
        return new SingleHiveAccumulatorState(bufferSupplier);
    }

    @Override
    public Class<? extends HiveAccumulatorState> getSingleStateClass()
    {
        return SingleHiveAccumulatorState.class;
    }

    @Override
    public HiveAccumulatorState createGroupedState()
    {
        return new GroupedHiveAccumulatorState(bufferSupplier);
    }

    @Override
    public Class<? extends HiveAccumulatorState> getGroupedStateClass()
    {
        return GroupedHiveAccumulatorState.class;
    }
}
