io.prestosql.operator.aggregation.FloatingPointBitsConverterUtil 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 io.prestosql.operator.aggregation;
public final class FloatingPointBitsConverterUtil
{
private FloatingPointBitsConverterUtil() {}
/**
* Converts a double value to a sortable long. The value is converted by getting their IEEE 754
* floating-point bit layout. Some bits are swapped to be able to compare the result as long.
*/
public static long doubleToSortableLong(double value)
{
long bits = Double.doubleToLongBits(value);
return bits ^ (bits >> 63) & Long.MAX_VALUE;
}
/**
* Converts a sortable long to double.
*
* @see #sortableLongToDouble(long)
*/
public static double sortableLongToDouble(long value)
{
value = value ^ (value >> 63) & Long.MAX_VALUE;
return Double.longBitsToDouble(value);
}
/**
* Converts a float value to a sortable int.
*
* @see #doubleToSortableLong(double)
*/
public static int floatToSortableInt(float value)
{
int bits = Float.floatToIntBits(value);
return bits ^ (bits >> 31) & Integer.MAX_VALUE;
}
/**
* Coverts a sortable int to float.
*
* @see #sortableLongToDouble(long)
*/
public static float sortableIntToFloat(int value)
{
value = value ^ (value >> 31) & Integer.MAX_VALUE;
return Float.intBitsToFloat(value);
}
}