org.apache.xerces.impl.dtd.models
Class CMStateSet

java.lang.Object
  org.apache.xerces.impl.dtd.models.CMStateSet

public class CMStateSet
extends java.lang.Object

This class is a very simple bitset class. The DFA content model code needs to support a bit set, but the java BitSet class is way, way overkill. Our bitset never needs to be expanded after creation, hash itself, etc... Since the vast majority of content models will never require more than 64 bits, and since allocation of anything in Java is expensive, this class provides a hybrid implementation that uses two ints for instances that use 64 bits or fewer. It has a byte array reference member which will only be used if more than 64 bits are required. Note that the code that uses this class will never perform operations on sets of different sizes, so that check does not have to be made here.

Version:

$Id: CMStateSet.java 446752 2006-09-15 21:55:19Z mrglavas $

Constructor Summary

CMStateSet(int bitCount)

Method Summary

boolean	equals(java.lang.Object o)
boolean	getBit(int bitToGet)
int	hashCode()
void	intersection(CMStateSet setToAnd)
boolean	isEmpty()
void	setBit(int bitToSet)
void	setTo(CMStateSet srcSet)
java.lang.String	toString()
void	union(CMStateSet setToOr)
void	zeroBits()

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

CMStateSet

public CMStateSet(int bitCount)

Method Detail

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

intersection

public final void intersection(CMStateSet setToAnd)

getBit

public final boolean getBit(int bitToGet)

isEmpty

public final boolean isEmpty()

union

public final void union(CMStateSet setToOr)

setBit

public final void setBit(int bitToSet)

setTo

public final void setTo(CMStateSet srcSet)

zeroBits

public final void zeroBits()

equals

public boolean equals(java.lang.Object o)

Overrides:

equals in class java.lang.Object

hashCode

public int hashCode()

Overrides:

hashCode in class java.lang.Object