com.hazelcast.client.impl.protocol.util
Class BitUtil

java.lang.Object
  com.hazelcast.client.impl.protocol.util.BitUtil

public final class BitUtil
extends Object

Miscellaneous useful functions for dealing with low level bits and bytes.

Field Summary

static short	BYTE_MASK byte mask
static int	CACHE_LINE_LENGTH Length of the data blocks used by the CPU cache sub-system in bytes.
static int	INT_MASK Int mask
static long	LONG_MASK Long mask
static int	SIZE_OF_BOOLEAN Size of a boolean in bytes
static int	SIZE_OF_BYTE Size of a byte in bytes
static int	SIZE_OF_CHAR Size of a char in bytes
static int	SIZE_OF_DOUBLE Size of a double in bytes
static int	SIZE_OF_FLOAT Size of a a float in bytes
static int	SIZE_OF_INT Size of an int in bytes
static int	SIZE_OF_LONG Size of a long in bytes
static int	SIZE_OF_SHORT Size of a short in bytes
static Charset	UTF8_CHARSET UTF-8 charset

Method Summary

static int	align(int value, int alignment) Align a value to the next multiple up of an alignment number.
static int	findNextPositivePowerOfTwo(int value) Fast method of finding the next power of 2 greater than or equal to the supplied value.
static boolean	isEven(int value) Checks to see if a value is an even number.
static boolean	isPowerOfTwo(int value) Checks to see if a value is a positive power of two.
static int	next(int current, int max) Cycles the indices of an array one at a time in a forward fashion.
static int	previous(int current, int max) Cycles the indices of an array one at a time in a backwards fashion.

Methods inherited from class java.lang.Object

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

Field Detail

SIZE_OF_BYTE

public static final int SIZE_OF_BYTE

Size of a byte in bytes

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Constant Field Values

SIZE_OF_BOOLEAN

public static final int SIZE_OF_BOOLEAN

Size of a boolean in bytes

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Constant Field Values

SIZE_OF_CHAR

public static final int SIZE_OF_CHAR

Size of a char in bytes

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Constant Field Values

SIZE_OF_SHORT

public static final int SIZE_OF_SHORT

Size of a short in bytes

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Constant Field Values

SIZE_OF_INT

public static final int SIZE_OF_INT

Size of an int in bytes

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Constant Field Values

SIZE_OF_FLOAT

public static final int SIZE_OF_FLOAT

Size of a a float in bytes

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Constant Field Values

SIZE_OF_LONG

public static final int SIZE_OF_LONG

Size of a long in bytes

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Constant Field Values

SIZE_OF_DOUBLE

public static final int SIZE_OF_DOUBLE

Size of a double in bytes

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Constant Field Values

CACHE_LINE_LENGTH

public static final int CACHE_LINE_LENGTH

Length of the data blocks used by the CPU cache sub-system in bytes.

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Constant Field Values

LONG_MASK

public static final long LONG_MASK

Long mask

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Constant Field Values

INT_MASK

public static final int INT_MASK

Int mask

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Constant Field Values

BYTE_MASK

public static final short BYTE_MASK

byte mask

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Constant Field Values

UTF8_CHARSET

public static final Charset UTF8_CHARSET

UTF-8 charset

Method Detail

findNextPositivePowerOfTwo

public static int findNextPositivePowerOfTwo(int value)

Fast method of finding the next power of 2 greater than or equal to the supplied value.

If the value is <= 0 then 1 will be returned.

This method is not suitable for Integer.MIN_VALUE or numbers greater than 2^30.

Parameters:

value - The value from which to search for the next power of 2.

Returns:

The next power of 2 or the value itself if it is a power of 2.

align

public static int align(int value,
                        int alignment)

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

This method executes without branching.

Parameters:

value - The value to be aligned to the next multiple up of the alignment number.

alignment - The alignment number to be used.

Returns:

the value aligned to the next multiple up of the alignment number.

isEven

public static boolean isEven(int value)

Checks to see if a value is an even number.

Parameters:

value - The value to check.

Returns:

true if the value is an even number, false otherwise.

isPowerOfTwo

public static boolean isPowerOfTwo(int value)

Checks to see if a value is a positive power of two.

Parameters:

value - The value to check.

Returns:

true if the number is a positive power of two, false otherwise.

next

public static int next(int current,
                       int max)

Cycles the indices of an array one at a time in a forward fashion.

Parameters:

current - The index array value to be incremented.

max - The maximum value for the index cycle.

Returns:

The next value, or zero if max is reached.

previous

public static int previous(int current,
                           int max)

Cycles the indices of an array one at a time in a backwards fashion.

Parameters:

current - The index array value to be decremented.

max - The maximum value for the index cycle.

Returns:

The next value, or max - 1 if current is zero.