org.jctools.util

Class Pow2

java.lang.Object

org.jctools.util.Pow2

public final class Pow2
extends Object

Power of 2 utility functions.

Field Summary

Fields

Modifier and Type	Field and Description
static int	MAX_POW2

Constructor Summary

Constructors

Constructor and Description
Pow2()

Method Summary

Modifier and Type	Method and Description
static long	align(long value, int alignment) Align a value to the next multiple up of alignment.
static boolean	isPowerOfTwo(int value)
static int	roundToPowerOfTwo(int value)

Methods inherited from class java.lang.Object

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

Field Detail

MAX_POW2

public static final int MAX_POW2

See Also:

Constant Field Values

Constructor Detail

Pow2

public Pow2()

Method Detail

roundToPowerOfTwo

public static int roundToPowerOfTwo(int value)

Parameters:

value - from which next positive power of two will be found.

Returns:

the next positive power of 2, this value if it is a power of 2. Negative values are mapped to 1.

Throws:

IllegalArgumentException - is value is more than MAX_POW2 or less than 0

isPowerOfTwo

public static boolean isPowerOfTwo(int value)

Parameters:

value - to be tested to see if it is a power of two.

Returns:

true if the value is a power of 2 otherwise false.

align

public static long align(long value,
                         int alignment)

Align a value to the next multiple up of alignment. If the value equals an alignment multiple then it is returned unchanged.

Parameters:

value - to be aligned up.

alignment - to be used, must be a power of 2.

Returns:

the value aligned to the next boundary.