org.apache.xerces.impl.dtd.models

Class CMStateSet

public class CMStateSet extends 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.

INTERNAL:

Usage of this class is not supported. It may be altered or removed at any time.

Version: $Id: CMStateSet.java,v 1.5 2004/10/04 22:00:42 mrglavas Exp $

Constructor Summary
CMStateSet(int bitCount)
Method Summary
booleanequals(Object o)
booleangetBit(int bitToGet)
inthashCode()
voidintersection(CMStateSet setToAnd)
booleanisEmpty()
voidsetBit(int bitToSet)
voidsetTo(CMStateSet srcSet)
StringtoString()
voidunion(CMStateSet setToOr)
voidzeroBits()

Constructor Detail

CMStateSet

public CMStateSet(int bitCount)

Method Detail

equals

public boolean equals(Object o)

getBit

public final boolean getBit(int bitToGet)

hashCode

public int hashCode()

intersection

public final void intersection(CMStateSet setToAnd)

isEmpty

public final boolean isEmpty()

setBit

public final void setBit(int bitToSet)

setTo

public final void setTo(CMStateSet srcSet)

toString

public String toString()

union

public final void union(CMStateSet setToOr)

zeroBits

public final void zeroBits()
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