com.ibm.wala.util.intset

Class FixedSizeBitVector

java.lang.Object

com.ibm.wala.util.intset.FixedSizeBitVector

All Implemented Interfaces:

Serializable, Cloneable

public final class FixedSizeBitVector
extends Object
implements Cloneable, Serializable

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
static long	serialVersionUID

Constructor Summary

Constructors

Constructor and Description
FixedSizeBitVector(FixedSizeBitVector s) Creates a copy of a Bit String
FixedSizeBitVector(int nbits) Creates an empty string with the specified size.

Method Summary

Modifier and Type	Method and Description
void	and(FixedSizeBitVector set) Logically ANDs this bit set with the specified set of bits.
static FixedSizeBitVector	and(FixedSizeBitVector b1, FixedSizeBitVector b2) Return a new bit string as the AND of two others.
void	clear(int bit) Clears a bit.
void	clearAll() Clears all bits.
Object	clone() Clones the FixedSizeBitVector.
void	copyBits(FixedSizeBitVector set) Copies the values of the bits in the specified set into this set.
boolean	equals(Object obj) Compares this object against the specified object.
boolean	get(int bit) Gets a bit.
int	hashCode() Gets the hashcode.
boolean	intersectionEmpty(FixedSizeBitVector other) Check if the intersection of the two sets is empty
boolean	isZero()
int	length() Calculates and returns the set's size in bits.
void	not() Logically NOT this bit string
static FixedSizeBitVector	not(FixedSizeBitVector s) Return the NOT of a bit string
void	or(FixedSizeBitVector set) Logically ORs this bit set with the specified set of bits.
static FixedSizeBitVector	or(FixedSizeBitVector b1, FixedSizeBitVector b2) Return a new FixedSizeBitVector as the OR of two others
int	populationCount() How many bits are set?
void	set(int bit) Sets a bit.
void	setAll() Sets all bits.
String	toString() Converts the FixedSizeBitVector to a String.
void	xor(FixedSizeBitVector set) Logically XORs this bit set with the specified set of bits.

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

serialVersionUID

public static final long serialVersionUID

See Also:

Constant Field Values

Constructor Detail

FixedSizeBitVector

public FixedSizeBitVector(int nbits)

Creates an empty string with the specified size.

Parameters:

nbits - the size of the string

FixedSizeBitVector

public FixedSizeBitVector(FixedSizeBitVector s)

Creates a copy of a Bit String

Parameters:

s - the string to copy

Throws:

IllegalArgumentException - if s is null

Method Detail

setAll

public void setAll()

Sets all bits.

set

public void set(int bit)

Sets a bit.

Parameters:

bit - the bit to be set

clearAll

public void clearAll()

Clears all bits.

clear

public void clear(int bit)

Clears a bit.

Parameters:

bit - the bit to be cleared

get

public boolean get(int bit)

Gets a bit.

Parameters:

bit - the bit to be gotten

not

public void not()

Logically NOT this bit string

not

public static FixedSizeBitVector not(FixedSizeBitVector s)

Return the NOT of a bit string

and

public void and(FixedSizeBitVector set)

Logically ANDs this bit set with the specified set of bits.

Parameters:

set - the bit set to be ANDed with

and

public static FixedSizeBitVector and(FixedSizeBitVector b1,
                                     FixedSizeBitVector b2)

Return a new bit string as the AND of two others.

or

public void or(FixedSizeBitVector set)
        throws IllegalArgumentException

Logically ORs this bit set with the specified set of bits.

Parameters:

set - the bit set to be ORed with

Throws:

IllegalArgumentException - if set == null

or

public static FixedSizeBitVector or(FixedSizeBitVector b1,
                                    FixedSizeBitVector b2)
                             throws IllegalArgumentException

Return a new FixedSizeBitVector as the OR of two others

Throws:

IllegalArgumentException - if b2 == null

xor

public void xor(FixedSizeBitVector set)

Logically XORs this bit set with the specified set of bits.

Parameters:

set - the bit set to be XORed with

Throws:

IllegalArgumentException - if set is null

intersectionEmpty

public boolean intersectionEmpty(FixedSizeBitVector other)

Check if the intersection of the two sets is empty

Parameters:

other - the set to check intersection with

copyBits

public void copyBits(FixedSizeBitVector set)

Copies the values of the bits in the specified set into this set.

Parameters:

set - the bit set to copy the bits from

Throws:

IllegalArgumentException - if set is null

hashCode

public int hashCode()

Gets the hashcode.

Overrides:

hashCode in class Object

populationCount

public int populationCount()

How many bits are set?

length

public int length()

Calculates and returns the set's size in bits. The maximum element in the set is the size - 1st element.

equals

public boolean equals(Object obj)

Compares this object against the specified object.

Overrides:

equals in class Object

Parameters:

obj - the object to compare with

Returns:

true if the objects are the same; false otherwise.

isZero

public boolean isZero()

clone

public Object clone()

Clones the FixedSizeBitVector.

Overrides:

clone in class Object

toString

public String toString()

Converts the FixedSizeBitVector to a String.

Overrides:

toString in class Object