com.facebook.presto.jdbc.internal.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.jdbc.internal.spi.block;
import com.facebook.presto.jdbc.internal.spi.type.TypeManager;
import com.facebook.presto.jdbc.internal.airlift.slice.SliceInput;
import com.facebook.presto.jdbc.internal.airlift.slice.SliceOutput;
import static java.util.Objects.requireNonNull;
public class SingleRowBlockEncoding
implements BlockEncoding
{
public static final BlockEncodingFactory FACTORY = new SingleRowBlockEncodingFactory();
private static final String NAME = "ROW_ELEMENT";
private final BlockEncoding[] fieldBlockEncodings;
public SingleRowBlockEncoding(BlockEncoding[] fieldBlockEncodings)
{
this.fieldBlockEncodings = requireNonNull(fieldBlockEncodings, "fieldBlockEncodings is null");
}
@Override
public String getName()
{
return NAME;
}
@Override
public void writeBlock(SliceOutput sliceOutput, Block block)
{
SingleRowBlock singleRowBlock = (SingleRowBlock) block;
int fieldOffset = singleRowBlock.getOffset() / fieldBlockEncodings.length;
for (int i = 0; i < fieldBlockEncodings.length; i++) {
fieldBlockEncodings[i].writeBlock(sliceOutput, singleRowBlock.getFieldBlock(i).getRegion(fieldOffset, 1));
}
}
@Override
public Block readBlock(SliceInput sliceInput)
{
Block[] fieldBlocks = new Block[fieldBlockEncodings.length];
for (int i = 0; i < fieldBlocks.length; i++) {
fieldBlocks[i] = fieldBlockEncodings[i].readBlock(sliceInput);
}
return new SingleRowBlock(0, fieldBlocks);
}
@Override
public BlockEncodingFactory getFactory()
{
return FACTORY;
}
public static class SingleRowBlockEncodingFactory
implements BlockEncodingFactory
{
@Override
public String getName()
{
return NAME;
}
@Override
public SingleRowBlockEncoding readEncoding(TypeManager typeManager, BlockEncodingSerde serde, SliceInput input)
{
int numFields = input.readInt();
BlockEncoding[] fieldBlockEncodings = new BlockEncoding[numFields];
for (int i = 0; i < numFields; i++) {
fieldBlockEncodings[i] = serde.readBlockEncoding(input);
}
return new SingleRowBlockEncoding(fieldBlockEncodings);
}
@Override
public void writeEncoding(BlockEncodingSerde serde, SliceOutput output, SingleRowBlockEncoding blockEncoding)
{
output.appendInt(blockEncoding.fieldBlockEncodings.length);
for (BlockEncoding fieldBlockEncoding : blockEncoding.fieldBlockEncodings) {
serde.writeBlockEncoding(output, fieldBlockEncoding);
}
}
}
}