/*
 * 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.noisyaggregation;

import com.facebook.presto.common.block.Block;
import com.facebook.presto.common.block.BlockBuilder;
import com.facebook.presto.common.type.Type;
import com.facebook.presto.spi.function.AccumulatorStateSerializer;
import io.airlift.slice.SliceInput;
import io.airlift.slice.SliceOutput;
import io.airlift.slice.Slices;

import static com.facebook.presto.common.type.VarbinaryType.VARBINARY;

public class NoisyCountStateSerializer
        implements AccumulatorStateSerializer<NoisyCountState>
{
    @Override
    public Type getSerializedType()
    {
        return VARBINARY;
    }

    @Override
    public void serialize(NoisyCountState state, BlockBuilder out)
    {
        SliceOutput output = Slices.allocate(NoisyCountState.calculateSerializationCapacity())
                .getOutput();
        NoisyCountState.writeToSerializer(state, output);

        VARBINARY.writeSlice(out, output.slice());
    }

    @Override
    public void deserialize(Block block, int index, NoisyCountState state)
    {
        SliceInput input = VARBINARY.getSlice(block, index).getInput();
        NoisyCountState.readFromSerializer(state, input);
    }
}
