/*
* 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.type;
import com.facebook.presto.spi.ConnectorSession;
import com.facebook.presto.spi.block.Block;
import com.facebook.presto.spi.block.BlockBuilder;
import com.facebook.presto.spi.type.AbstractFixedWidthType;
import com.facebook.presto.spi.type.TypeSignature;
import static com.google.common.base.Preconditions.checkArgument;
public final class UnknownType
extends AbstractFixedWidthType
{
public static final UnknownType UNKNOWN = new UnknownType();
public static final String NAME = "unknown";
private UnknownType()
{
super(new TypeSignature(NAME), void.class, 0);
}
@Override
public boolean isComparable()
{
return true;
}
@Override
public boolean isOrderable()
{
return true;
}
@Override
public long hash(Block block, int position)
{
// Check that the position is valid
checkArgument(block.isNull(position), "Expected NULL value for UnknownType");
return 0;
}
@Override
public boolean equalTo(Block leftBlock, int leftPosition, Block rightBlock, int rightPosition)
{
// Check that the position is valid
checkArgument(leftBlock.isNull(leftPosition), "Expected NULL value for UnknownType");
checkArgument(rightBlock.isNull(rightPosition), "Expected NULL value for UnknownType");
return true;
}
@Override
public int compareTo(Block leftBlock, int leftPosition, Block rightBlock, int rightPosition)
{
// Check that the position is valid
checkArgument(leftBlock.isNull(leftPosition), "Expected NULL value for UnknownType");
checkArgument(rightBlock.isNull(rightPosition), "Expected NULL value for UnknownType");
return 0;
}
@Override
public Object getObjectValue(ConnectorSession session, Block block, int position)
{
// call is null in case position is out of bounds
checkArgument(block.isNull(position), "Expected NULL value for UnknownType");
return null;
}
@Override
public void appendTo(Block block, int position, BlockBuilder blockBuilder)
{
blockBuilder.appendNull();
}
}