com.facebook.presto.jdbc.internal.common.block.LongArrayBlockEncoding 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.EncoderUtil.decodeNullBits;
import static com.facebook.presto.jdbc.internal.common.block.EncoderUtil.encodeNullsAsBits;
public class LongArrayBlockEncoding
implements BlockEncoding
{
public static final String NAME = "LONG_ARRAY";
@Override
public String getName()
{
return NAME;
}
@Override
public void writeBlock(BlockEncodingSerde blockEncodingSerde, SliceOutput sliceOutput, Block block)
{
int positionCount = block.getPositionCount();
sliceOutput.appendInt(positionCount);
encodeNullsAsBits(sliceOutput, block);
boolean mayHaveNull = block.mayHaveNull();
for (int position = 0; position < positionCount; position++) {
if (!mayHaveNull || !block.isNull(position)) {
sliceOutput.writeLong(block.getLong(position));
}
}
}
@Override
public Block readBlock(BlockEncodingSerde blockEncodingSerde, SliceInput sliceInput)
{
int positionCount = sliceInput.readInt();
boolean[] valueIsNull = decodeNullBits(sliceInput, positionCount).orElse(null);
long[] values = new long[positionCount];
if (valueIsNull == null) {
// No nulls present, read values array directly from input
sliceInput.readBytes(Slices.wrappedLongArray(values));
}
else {
for (int position = 0; position < values.length; position++) {
if (!valueIsNull[position]) {
values[position] = sliceInput.readLong();
}
}
}
return new LongArrayBlock(0, positionCount, valueIsNull, values);
}
}
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