com.facebook.presto.spi.block.SingleRowBlockEncoding 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.spi.block;
import io.airlift.slice.SliceInput;
import io.airlift.slice.SliceOutput;
public class SingleRowBlockEncoding
implements BlockEncoding
{
public static final String NAME = "ROW_ELEMENT";
@Override
public String getName()
{
return NAME;
}
@Override
public void writeBlock(BlockEncodingSerde blockEncodingSerde, SliceOutput sliceOutput, Block block)
{
SingleRowBlock singleRowBlock = (SingleRowBlock) block;
int numFields = singleRowBlock.getNumFields();
int rowIndex = singleRowBlock.getRowIndex();
sliceOutput.appendInt(numFields);
for (int i = 0; i < numFields; i++) {
blockEncodingSerde.writeBlock(sliceOutput, singleRowBlock.getRawFieldBlock(i).getRegion(rowIndex, 1));
}
}
@Override
public Block readBlock(BlockEncodingSerde blockEncodingSerde, SliceInput sliceInput)
{
int numFields = sliceInput.readInt();
Block[] fieldBlocks = new Block[numFields];
for (int i = 0; i < fieldBlocks.length; i++) {
fieldBlocks[i] = blockEncodingSerde.readBlock(sliceInput);
}
return new SingleRowBlock(0, fieldBlocks);
}
}