Class BidiClassifier

java.lang.Object
org.graalvm.shadowed.com.ibm.icu.text.BidiClassifier
public class BidiClassifier extends Object
Overrides default Bidi class values with custom ones.

The override mechanism requires to define a subclass of BidiClassifier which overrides the classifier method to assign customized Bidi classes.

This may be useful for assigning Bidi classes to PUA characters, or for special application needs. For instance, an application may want to handle all spaces like L or R characters (according to the base direction) when creating the visual ordering of logical lines which are part of a report organized in columns: there should not be interaction between adjacent cells.

To start using this customized classifier with a Bidi object, it must be specified by calling the Bidi.setCustomClassifier method; after that, the method classify of the custom BidiClassifier will be called by the UBA implementation any time the class of a character is to be determined.

See Also:

  • Field Summary

    Fields
    Modifier and Type
    Field
    Description
    protected Object
    context
    This object can be used for any purpose by the caller to pass information to the BidiClassifier methods, and by the BidiClassifier methods themselves.
    For instance, this object can be used to save a reference to a previous custom BidiClassifier while setting a new one, so as to allow chaining between them.

  • Constructor Summary

    Constructors
    Constructor
    Description
    BidiClassifier(Object context)
     

  • Method Summary

    Modifier and Type
    Method
    Description
    int
    classify(int c)
    Gets customized Bidi class for the code point c.
    Object
    getContext()
    Returns the current classifier context.
    void
    setContext(Object context)
    Sets classifier context, which can be used either by a caller or callee for various purposes.

    Methods inherited from class Object

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

  • Field Details

    • context

      protected Object context
      This object can be used for any purpose by the caller to pass information to the BidiClassifier methods, and by the BidiClassifier methods themselves.
      For instance, this object can be used to save a reference to a previous custom BidiClassifier while setting a new one, so as to allow chaining between them.

  • Constructor Details

    • BidiClassifier

      public BidiClassifier(Object context)
      Parameters:
      context - Context for this classifier instance. May be null.

  • Method Details

    • setContext

      public void setContext(Object context)
      Sets classifier context, which can be used either by a caller or callee for various purposes.
      Parameters:
      context - Context for this classifier instance. May be null.

    • getContext

      public Object getContext()
      Returns the current classifier context.

    • classify

      public int classify(int c)
      Gets customized Bidi class for the code point c.

      Default implementation, to be overridden.

      Parameters:
      c - Code point to be classified.
      Returns:
      An integer representing directional property / Bidi class for the given code point c, or UCharacter.getIntPropertyMaxValue(UProperty.BIDI_CLASS)+1 to signify that there is no need to override the standard Bidi class for the given code point.