/*
* 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.state;
import com.facebook.presto.array.ObjectBigArray;
import com.facebook.presto.spi.block.BlockBuilder;
import com.facebook.presto.spi.function.AccumulatorStateFactory;
import static java.util.Objects.requireNonNull;
public class ArrayAggregationStateFactory
implements AccumulatorStateFactory<ArrayAggregationState>
{
@Override
public ArrayAggregationState createSingleState()
{
return new SingleArrayAggregationState();
}
@Override
public Class<? extends ArrayAggregationState> getSingleStateClass()
{
return SingleArrayAggregationState.class;
}
@Override
public ArrayAggregationState createGroupedState()
{
return new GroupedArrayAggregationState();
}
@Override
public Class<? extends ArrayAggregationState> getGroupedStateClass()
{
return GroupedArrayAggregationState.class;
}
public static class GroupedArrayAggregationState
extends AbstractGroupedAccumulatorState
implements ArrayAggregationState
{
private final ObjectBigArray<BlockBuilder> blockBuilders = new ObjectBigArray<BlockBuilder>();
private long size;
@Override
public void ensureCapacity(long size)
{
blockBuilders.ensureCapacity(size);
}
@Override
public long getEstimatedSize()
{
return size + blockBuilders.sizeOf();
}
@Override
public void addMemoryUsage(long memory)
{
size += memory;
}
@Override
public BlockBuilder getBlockBuilder()
{
return blockBuilders.get(getGroupId());
}
@Override
public void setBlockBuilder(BlockBuilder value)
{
requireNonNull(value, "value is null");
BlockBuilder previous = getBlockBuilder();
if (previous != null) {
size -= previous.getRetainedSizeInBytes();
}
blockBuilders.set(getGroupId(), value);
size += value.getRetainedSizeInBytes();
}
}
public static class SingleArrayAggregationState
implements ArrayAggregationState
{
private BlockBuilder blockBuilder;
@Override
public long getEstimatedSize()
{
if (blockBuilder == null) {
return 0L;
}
else {
return blockBuilder.getRetainedSizeInBytes();
}
}
@Override
public BlockBuilder getBlockBuilder()
{
return blockBuilder;
}
@Override
public void setBlockBuilder(BlockBuilder value)
{
requireNonNull(value, "value is null");
blockBuilder = value;
}
@Override
public void addMemoryUsage(long memory)
{
// no op
}
}
}