/*
* 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.spi.type;
import com.facebook.presto.spi.ConnectorSession;
import com.facebook.presto.spi.PrestoException;
import com.facebook.presto.spi.block.Block;
import com.facebook.presto.spi.block.BlockBuilder;
import static com.facebook.presto.spi.StandardErrorCode.GENERIC_INTERNAL_ERROR;
import static com.facebook.presto.spi.type.TypeSignature.parseTypeSignature;
import static java.lang.Float.intBitsToFloat;
import static java.lang.Math.toIntExact;
import static java.lang.String.format;
public final class RealType
extends AbstractIntType
{
public static final RealType REAL = new RealType();
private RealType()
{
super(parseTypeSignature(StandardTypes.REAL));
}
@Override
public Object getObjectValue(ConnectorSession session, Block block, int position)
{
if (block.isNull(position)) {
return null;
}
return intBitsToFloat(block.getInt(position, 0));
}
@Override
public boolean equalTo(Block leftBlock, int leftPosition, Block rightBlock, int rightPosition)
{
float leftValue = intBitsToFloat(leftBlock.getInt(leftPosition, 0));
float rightValue = intBitsToFloat(rightBlock.getInt(rightPosition, 0));
// direct equality is correct here
// noinspection FloatingPointEquality
return leftValue == rightValue;
}
@Override
public int compareTo(Block leftBlock, int leftPosition, Block rightBlock, int rightPosition)
{
// WARNING: the correctness of InCodeGenerator is dependent on the implementation of this
// function being the equivalence of internal long representation.
float leftValue = intBitsToFloat(leftBlock.getInt(leftPosition, 0));
float rightValue = intBitsToFloat(rightBlock.getInt(rightPosition, 0));
return Float.compare(leftValue, rightValue);
}
@Override
public void writeLong(BlockBuilder blockBuilder, long value)
{
try {
toIntExact(value);
}
catch (ArithmeticException e) {
throw new PrestoException(GENERIC_INTERNAL_ERROR, format("Value (%sb) is not a valid single-precision float", Long.toBinaryString(value).replace(' ', '0')));
}
blockBuilder.writeInt((int) value).closeEntry();
}
@Override
public boolean equals(Object other)
{
return other == REAL;
}
@Override
public int hashCode()
{
return getClass().hashCode();
}
}