/*
* 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.dictionary;
import com.facebook.presto.block.Block;
import com.facebook.presto.block.RandomAccessBlock;
import com.facebook.presto.serde.BlockEncoding;
import com.facebook.presto.serde.DictionaryBlockEncoding;
import com.facebook.presto.tuple.TupleInfo;
import io.airlift.units.DataSize;
import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;
public class DictionaryEncodedBlock
implements Block
{
private final Dictionary dictionary;
private final Block idBlock;
public DictionaryEncodedBlock(Dictionary dictionary, Block idBlock)
{
checkNotNull(dictionary, "dictionary is null");
checkNotNull(idBlock, "block is null");
checkArgument(idBlock.getTupleInfo().equals(TupleInfo.SINGLE_LONG), "block must contain tuples with a single long value");
this.dictionary = dictionary;
this.idBlock = idBlock;
}
@Override
public TupleInfo getTupleInfo()
{
return dictionary.getTupleInfo();
}
public Dictionary getDictionary()
{
return dictionary;
}
public Block getIdBlock()
{
return idBlock;
}
@Override
public int getPositionCount()
{
return idBlock.getPositionCount();
}
@Override
public DataSize getDataSize()
{
// todo include dictionary size
return idBlock.getDataSize();
}
@Override
public BlockEncoding getEncoding()
{
return new DictionaryBlockEncoding(dictionary, idBlock.getEncoding());
}
@Override
public Block getRegion(int positionOffset, int length)
{
return new DictionaryEncodedBlock(dictionary, idBlock.getRegion(positionOffset, length));
}
@Override
public RandomAccessBlock toRandomAccessBlock()
{
// todo add a RandomAccessDictionaryEncodedBlock that contains a RandomAccessBlock for the ids
throw new UnsupportedOperationException();
}
@Override
public DictionaryEncodedBlockCursor cursor()
{
return new DictionaryEncodedBlockCursor(dictionary, idBlock.cursor());
}
}