org.apache.jena.atlas.lib

Class BitsInt

java.lang.Object

org.apache.jena.atlas.lib.BitsInt

public final class BitsInt
extends Object

Utilities for manipulating a bit pattern which held in a 32 bit int

Method Summary

Methods

Modifier and Type	Method and Description
static int	access(int bits, int start, int finish) Get the bits from start (inclusive) to finish (exclusive), leaving them aligned in the int.
static int	clear(int bits, int start, int finish)
static boolean	isSet(int bits, int bitIndex) Test whether a bit is set
static int	mask(int start, int finish) Create a mask that has ones between bit positions start (inc) and finish (exc)
static int	maskZero(int start, int finish) Create a mask that has zeros between bit positions start (inc) and finish (exc) and ones elsewhere
static int	pack(int bits, int value, int start, int finish) Place the value into the bit pattern between start and finish; leaves other bits aint.
static int	set(int bits, int bitIndex) Set the bits specificied.
static int	set(int bits, int start, int finish) Set the bits from start (inc) to finish (exc) to one
static boolean	test(int bits, boolean isSet, int bitIndex) Test whether a bit is the same as isSet
static boolean	test(int bits, int value, int start, int finish) Test whether a range has a specific value or not
static int	unpack(int bits, int start, int finish) Extract the value packed into bits start (inclusive) and finish (exclusive), the value is returned the low part of the returned int.
static int	unpack(String str, int startChar, int finishChar) Get bits from a hex string.

Methods inherited from class java.lang.Object

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

Method Detail

unpack

public static final int unpack(int bits,
         int start,
         int finish)

Extract the value packed into bits start (inclusive) and finish (exclusive), the value is returned the low part of the returned int. The low bit is bit zero.

pack

public static final int pack(int bits,
       int value,
       int start,
       int finish)

Place the value into the bit pattern between start and finish; leaves other bits aint.

unpack

public static final int unpack(String str,
         int startChar,
         int finishChar)

Get bits from a hex string.

Parameters:

str -

startChar - Index of first character (counted from the left, string style).

finishChar - Index after the last character (counted from the left, string style).

Returns:

int

set

public static final int set(int bits,
      int bitIndex)

Set the bits specificied.

Parameters:

bits - Pattern

bitIndex -

Returns:

Modified pattern

set

public static final int set(int bits,
      int start,
      int finish)

Set the bits from start (inc) to finish (exc) to one

Parameters:

bits - Pattern

start - start (inclusive)

finish - finish (exclusive)

Returns:

Modified pattern

test

public static final boolean test(int bits,
           boolean isSet,
           int bitIndex)

Test whether a bit is the same as isSet

Parameters:

bits - Pattern

isSet - Test whether is set or not.

bitIndex - Bit index

Returns:

Boolean

isSet

public static final boolean isSet(int bits,
            int bitIndex)

Test whether a bit is set

Parameters:

bits - Pattern

bitIndex - Bit index

Returns:

Boolean

test

public static final boolean test(int bits,
           int value,
           int start,
           int finish)

Test whether a range has a specific value or not

Parameters:

bits - Pattern

value - Value to test for

start - start (inclusive)

finish - finish (exclusive)

Returns:

Boolean

access

public static final int access(int bits,
         int start,
         int finish)

Get the bits from start (inclusive) to finish (exclusive), leaving them aligned in the int. See also unpack, returns the value found at that place.

clear

public static final int clear(int bits,
        int start,
        int finish)

mask

public static final int mask(int start,
       int finish)

Create a mask that has ones between bit positions start (inc) and finish (exc)

maskZero

public static final int maskZero(int start,
           int finish)

Create a mask that has zeros between bit positions start (inc) and finish (exc) and ones elsewhere