com.facebook.presto.jdbc.internal.spi.function.AccumulatorStateSerializer Maven / Gradle / Ivy
/*
* 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.jdbc.internal.spi.function;
import com.facebook.presto.jdbc.internal.common.block.Block;
import com.facebook.presto.jdbc.internal.common.block.BlockBuilder;
import com.facebook.presto.jdbc.internal.common.type.Type;
public interface AccumulatorStateSerializer
{
Type getSerializedType();
void serialize(T state, BlockBuilder out);
/**
* Deserialize {@code index}-th position in {@code block} into {@code state}.
*
* This method may be invoked with a reused dirty {@code state}. Therefore,
* implementations must not make assumptions about the initial value of
* {@code state}.
*
* Null positions in {@code block} are skipped and ignored. In other words,
* {@code block.isNull(index)} is guaranteed to return false.
*/
void deserialize(Block block, int index, T state);
}
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