CharacterClass

All Superinterfaces:

java.util.function.IntPredicate, IntPredicateProxy

All Known Implementing Classes:

Categories.Category, EmptyCharacterClass, IntSetCharacterClass, InverseCharacterClass, PredicateCharacterClass, SingletonCharacterClass
```
public interface CharacterClass
extends IntPredicateProxy
```
A character class represents a set of characters for regex matching purposes. It extends IntPredicate, so there is a mechanism for testing whether a particular codepoint is a member of the class. In addition it provides a method for testing whether two classes are disjoint, which is used when optimizing regular expressions.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`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`	`test(int value)`	Test whether a particular codepoint is a member of the character class

Methods inherited from interface java.util.function.IntPredicate
and, negate, or

Methods inherited from interface net.sf.saxon.z.IntPredicateProxy
union

- Method Detail
  - test
```
boolean test(int value)
```
    Test whether a particular codepoint is a member of the character class
    
    Specified by:
    
    test in interface java.util.function.IntPredicate
    
    Specified by:
    
    test in interface IntPredicateProxy
    
    Parameters:
    
    value - the codepoint to be tested
    
    Returns:
    
    true if it matches
  - isDisjoint
```
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). If in doubt, return false.
    
    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
```
IntSet getIntSet()
```
    Get the set of matching characters if available. If not available, return null