com.facebook.presto.jdbc.internal.common.block.ArrayBlockEncoding 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.common.block;
import com.facebook.presto.jdbc.internal.io.airlift.slice.SliceInput;
import com.facebook.presto.jdbc.internal.io.airlift.slice.SliceOutput;
import com.facebook.presto.jdbc.internal.io.airlift.slice.Slices;
import static com.facebook.presto.jdbc.internal.common.block.ArrayBlock.createArrayBlockInternal;
import static com.facebook.presto.jdbc.internal.common.block.EncoderUtil.decodeNullBits;
import static com.facebook.presto.jdbc.internal.common.block.EncoderUtil.encodeNullsAsBits;
public class ArrayBlockEncoding
implements BlockEncoding
{
public static final String NAME = "ARRAY";
@Override
public String getName()
{
return NAME;
}
@Override
public void writeBlock(BlockEncodingSerde blockEncodingSerde, SliceOutput sliceOutput, Block block)
{
AbstractArrayBlock arrayBlock = (AbstractArrayBlock) block;
int positionCount = arrayBlock.getPositionCount();
int offsetBase = arrayBlock.getOffsetBase();
int[] offsets = arrayBlock.getOffsets();
int valuesStartOffset = offsets[offsetBase];
int valuesEndOffset = offsets[offsetBase + positionCount];
Block values = arrayBlock.getRawElementBlock().getRegion(valuesStartOffset, valuesEndOffset - valuesStartOffset);
blockEncodingSerde.writeBlock(sliceOutput, values);
sliceOutput.appendInt(positionCount);
for (int position = 0; position < positionCount + 1; position++) {
sliceOutput.writeInt(offsets[offsetBase + position] - valuesStartOffset);
}
encodeNullsAsBits(sliceOutput, block);
}
@Override
public Block readBlock(BlockEncodingSerde blockEncodingSerde, SliceInput sliceInput)
{
Block values = blockEncodingSerde.readBlock(sliceInput);
int positionCount = sliceInput.readInt();
int[] offsets = new int[positionCount + 1];
sliceInput.readBytes(Slices.wrappedIntArray(offsets));
boolean[] valueIsNull = decodeNullBits(sliceInput, positionCount).orElse(null);
return createArrayBlockInternal(0, positionCount, valueIsNull, offsets, values);
}
}
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