Package net.sf.saxon.regex.charclass

## Class EmptyCharacterClass

- java.lang.Object
- - net.sf.saxon.regex.charclass.EmptyCharacterClass

- All Implemented Interfaces:
    `java.util.function.IntPredicate`, `CharacterClass`

      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

    All Methods Static Methods Instance Methods Concrete Methods
    Modifier and Type | Method | 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` | `test​(int value)` |

    - ### Methods inherited from class java.lang.Object

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

    - ### Methods inherited from interface java.util.function.IntPredicate

      `and, negate, or`

- - ### Method Detail

    - #### getInstance

          public static EmptyCharacterClass getInstance()

    - #### getComplement

          public static CharacterClass getComplement()

    - #### test

          public boolean test​(int value)

      Specified by:
        `test` in interface `java.util.function.IntPredicate`

    - #### 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`