Class BidiClassifier
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:
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Field Summary
FieldsModifier and TypeFieldDescriptionprotected Object
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 -
Method Summary
Modifier and TypeMethodDescriptionint
classify
(int c) Gets customized Bidi class for the code pointc
.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.
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Field Details
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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.
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Constructor Details
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BidiClassifier
- Parameters:
context
- Context for this classifier instance. May be null.
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Method Details
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setContext
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.
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getContext
Returns the current classifier context. -
classify
public int classify(int c) Gets customized Bidi class for the code pointc
.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.
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