Package com.itextpdf.io.font.otf

Class ContextualRule

java.lang.Object

com.itextpdf.io.font.otf.ContextualRule

Direct Known Subclasses:

ContextualPositionRule, ContextualSubstRule

 public abstract class ContextualRule extends Object 
      

Constructor Summary

Constructors

Constructor	Description
ContextualRule()

Method Summary

Modifier and Type	Method	Description
int	getBacktrackContextLength()	Gets the length of the backtrack context glyph sequence defined by this rule
abstract int	getContextLength()	Gets the length of the context glyph sequence defined by this rule
int	getLookaheadContextLength()	Gets the length of the lookahead context glyph sequence defined by this rule
boolean	isGlyphMatchesBacktrack(int glyphId, int atIdx)	Checks if glyph line element matches element from backtrack sequence of the rule.
abstract boolean	isGlyphMatchesInput(int glyphId, int atIdx)	Checks if glyph line element matches element from input sequence of the rule.
boolean	isGlyphMatchesLookahead(int glyphId, int atIdx)	Checks if glyph line element matches element from lookahead sequence of the rule.

Methods inherited from class java.lang.Object

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

Constructor Details

ContextualRule

 public ContextualRule() 
            

Method Details

getContextLength

 public abstract int getContextLength() 
            

Gets the length of the context glyph sequence defined by this rule

Returns:

length of the context

isGlyphMatchesInput

 public abstract boolean isGlyphMatchesInput 
             (int glyphId, int atIdx) 
            

Checks if glyph line element matches element from input sequence of the rule.

NOTE: rules do not contain the first element of the input sequence, the first element is defined by rule position in substitution table. Therefore atIdx shall not be 0.

Parameters:

glyphId - glyph code id

atIdx - index in the rule sequence. Shall be: 0 < atIdx < getContextLength()

Returns:

true if glyph matches element

getLookaheadContextLength

 public int getLookaheadContextLength() 
            

Gets the length of the lookahead context glyph sequence defined by this rule

Returns:

length of the lookahead context

getBacktrackContextLength

 public int getBacktrackContextLength() 
            

Gets the length of the backtrack context glyph sequence defined by this rule

Returns:

length of the backtrack context

isGlyphMatchesLookahead

 public boolean isGlyphMatchesLookahead 
             (int glyphId, int atIdx) 
            

Checks if glyph line element matches element from lookahead sequence of the rule.

Parameters:

glyphId - glyph code id

atIdx - index in rule sequence. Shall be: 0 <= atIdx < getLookaheadContextLength()

Returns:

true if glyph matches element from lookahead sequence

isGlyphMatchesBacktrack

 public boolean isGlyphMatchesBacktrack 
             (int glyphId, int atIdx) 
            

Checks if glyph line element matches element from backtrack sequence of the rule.

Parameters:

glyphId - glyph code id

atIdx - index in rule sequence. Shall be: 0 <= atIdx < getBacktrackContextLength()

Returns:

true if glyph matches element from backtrack sequence