/*
* 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.spi.type;
import com.facebook.presto.spi.block.BlockBuilder;
import com.facebook.presto.spi.block.BlockBuilderStatus;
import com.facebook.presto.spi.block.VariableWidthBlockBuilder;
public abstract class AbstractVariableWidthType
extends AbstractType
implements VariableWidthType
{
private static final int EXPECTED_BYTES_PER_ENTRY = 32;
protected AbstractVariableWidthType(TypeSignature signature, Class<?> javaType)
{
super(signature, javaType);
}
@Override
public BlockBuilder createBlockBuilder(BlockBuilderStatus blockBuilderStatus, int expectedEntries, int expectedBytesPerEntry)
{
return new VariableWidthBlockBuilder(
blockBuilderStatus,
expectedBytesPerEntry == 0 ? expectedEntries : Math.min(expectedEntries, blockBuilderStatus.getMaxBlockSizeInBytes() / expectedBytesPerEntry),
expectedBytesPerEntry);
}
@Override
public BlockBuilder createBlockBuilder(BlockBuilderStatus blockBuilderStatus, int expectedEntries)
{
return createBlockBuilder(blockBuilderStatus, expectedEntries, EXPECTED_BYTES_PER_ENTRY);
}
}