/*
* 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.block.rle;
import com.facebook.presto.block.Block;
import com.facebook.presto.block.RandomAccessBlock;
import com.facebook.presto.serde.RunLengthBlockEncoding;
import com.facebook.presto.tuple.Tuple;
import com.facebook.presto.tuple.TupleInfo;
import com.google.common.base.Objects;
import com.google.common.base.Preconditions;
import io.airlift.slice.Slice;
import io.airlift.units.DataSize;
import io.airlift.units.DataSize.Unit;
public class RunLengthEncodedBlock
implements RandomAccessBlock
{
private final Tuple value;
private final int positionCount;
public RunLengthEncodedBlock(Tuple value, int positionCount)
{
this.value = value;
this.positionCount = positionCount;
}
public Tuple getValue()
{
return value;
}
public Tuple getSingleValue()
{
return value;
}
@Override
public int getPositionCount()
{
return positionCount;
}
@Override
public DataSize getDataSize()
{
return new DataSize(value.getTupleSlice().length(), Unit.BYTE);
}
@Override
public RunLengthBlockEncoding getEncoding()
{
return new RunLengthBlockEncoding(value.getTupleInfo());
}
@Override
public Block getRegion(int positionOffset, int length)
{
Preconditions.checkPositionIndexes(positionOffset, positionOffset + length, positionCount);
return new RunLengthEncodedBlock(value, length);
}
@Override
public RandomAccessBlock toRandomAccessBlock()
{
return this;
}
@Override
public TupleInfo getTupleInfo()
{
return value.getTupleInfo();
}
@Override
public boolean getBoolean(int position)
{
checkReadablePosition(position);
return value.getBoolean();
}
@Override
public long getLong(int position)
{
return value.getLong();
}
@Override
public double getDouble(int position)
{
return value.getDouble();
}
@Override
public Slice getSlice(int position)
{
return value.getSlice();
}
@Override
public boolean isNull(int position)
{
checkReadablePosition(position);
return value.isNull();
}
@Override
public String toString()
{
return Objects.toStringHelper(this)
.add("value", value)
.add("positionCount", positionCount)
.toString();
}
@Override
public RunLengthEncodedBlockCursor cursor()
{
return new RunLengthEncodedBlockCursor(value, positionCount);
}
private void checkReadablePosition(int position)
{
Preconditions.checkState(position > 0 && position < positionCount, "position is not valid");
}
}