org.janusgraph.util.encoding

Class NumericUtils

java.lang.Object

org.janusgraph.util.encoding.NumericUtils

public final class NumericUtils
extends Object

This file is copied verbatim from Apache Lucene NumericUtils.java Only the double/float to sortable long/int conversions are retained.

Method Summary

Modifier and Type	Method and Description
static long	doubleToSortableLong(double val) Converts a double value to a sortable signed long.
static int	floatToSortableInt(float val) Converts a float value to a sortable signed int.
static long	sortableDoubleBits(long bits) Converts IEEE 754 representation of a double to sortable order (or back to the original)
static int	sortableFloatBits(int bits) Converts IEEE 754 representation of a float to sortable order (or back to the original)
static float	sortableIntToFloat(int val) Converts a sortable int back to a float.
static double	sortableLongToDouble(long val) Converts a sortable long back to a double.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

doubleToSortableLong

public static long doubleToSortableLong(double val)

Converts a double value to a sortable signed long. The value is converted by getting their IEEE 754 floating-point "double format" bit layout and then some bits are swapped, to be able to compare the result as long. By this the precision is not reduced, but the value can easily used as a long. The sort order (including Double.NaN) is defined by Double.compareTo(java.lang.Double); NaN is greater than positive infinity.

See Also:

sortableLongToDouble(long)

sortableLongToDouble

public static double sortableLongToDouble(long val)

Converts a sortable long back to a double.

See Also:

doubleToSortableLong(double)

floatToSortableInt

public static int floatToSortableInt(float val)

Converts a float value to a sortable signed int. The value is converted by getting their IEEE 754 floating-point "float format" bit layout and then some bits are swapped, to be able to compare the result as int. By this the precision is not reduced, but the value can easily used as an int. The sort order (including Float.NaN) is defined by Float.compareTo(java.lang.Float); NaN is greater than positive infinity.

See Also:

sortableIntToFloat(int)

sortableIntToFloat

public static float sortableIntToFloat(int val)

Converts a sortable int back to a float.

See Also:

floatToSortableInt(float)

sortableDoubleBits

public static long sortableDoubleBits(long bits)

Converts IEEE 754 representation of a double to sortable order (or back to the original)

sortableFloatBits

public static int sortableFloatBits(int bits)

Converts IEEE 754 representation of a float to sortable order (or back to the original)