net.sf.saxon.regex.charclass

Class EmptyCharacterClass

java.lang.Object

net.sf.saxon.regex.charclass.EmptyCharacterClass

All Implemented Interfaces:

CharacterClass, IntPredicate

public class EmptyCharacterClass
extends java.lang.Object
implements CharacterClass

A character class represents a set of characters for regex matching purposes. The empty character class matches no characters

Method Summary

Modifier and Type	Method and Description
static CharacterClass	getComplement()
static EmptyCharacterClass	getInstance()
IntSet	getIntSet() Get the set of matching characters if available.
boolean	isDisjoint(CharacterClass other) Ask whether this character class is known to be disjoint with another character class (that is, the two classes have no characters in common).
boolean	matches(int value) Ask whether a given value matches this predicate

Methods inherited from class java.lang.Object

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

Method Detail

getInstance

public static EmptyCharacterClass getInstance()

getComplement

public static CharacterClass getComplement()

matches

public boolean matches(int value)

Description copied from interface: IntPredicate

Ask whether a given value matches this predicate

Specified by:

matches in interface IntPredicate

Parameters:

value - the value to be tested

Returns:

true if the value matches; false if it does not

isDisjoint

public boolean isDisjoint(CharacterClass other)

Description copied from interface: CharacterClass

Ask whether this character class is known to be disjoint with another character class (that is, the two classes have no characters in common). If in doubt, return false.

Specified by:

isDisjoint in interface CharacterClass

Parameters:

other - the other character class

Returns:

true if the character classes are known to be disjoint; false if there may be characters in common between the two classes

getIntSet

public IntSet getIntSet()

Description copied from interface: CharacterClass

Get the set of matching characters if available. If not available, return null

Specified by:

getIntSet in interface CharacterClass