Package com.itextpdf.io.font.otf

Class ContextualTableContextualRule>

java.lang.Object

com.itextpdf.io.font.otf.ContextualTable

Direct Known Subclasses:

ChainingContextualTable, PosTableLookup7Format2, SubTableLookup5Format1, SubTableLookup5Format2, SubTableLookup5Format3

 public abstract class ContextualTableContextualRule> extends Object 
      

Field Summary

Fields

Modifier and Type	Field	Description
protected int	lookupFlag
protected OpenTypeFontTableReader	openReader

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	ContextualTable(OpenTypeFontTableReader openReader, int lookupFlag)

Method Summary

Modifier and Type	Method	Description
protected int	checkIfContextMatch(GlyphLine line, T rule)	Checks if given glyph line matches given rule.
T	getMatchingContextRule(GlyphLine line)	Gets a most preferable context rule that matches the line at current position.
protected abstract List<T>	getSetOfRulesForStartGlyph(int startId)	Gets a set of rules, which start with given glyph id.

Methods inherited from class java.lang.Object

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

Field Details

openReader

 protected OpenTypeFontTableReader openReader 
            

lookupFlag

 protected int lookupFlag 
            

Constructor Details

ContextualTable

 protected ContextualTable 
             (OpenTypeFontTableReader openReader, int lookupFlag) 
            

Method Details

getMatchingContextRule

 public T getMatchingContextRule 
             (GlyphLine line) 
            

Gets a most preferable context rule that matches the line at current position. If no matching context rule is found, it returns null.

NOTE: if matching context rule is found, the GlyphLine.start and GlyphLine.end will be changed in such way that they will point at start and end of the matching context glyph sequence inside the glyph line.

Parameters:

line - a line, which is to be checked if it matches some context.

Returns:

matching context rule or null, if none was found.

getSetOfRulesForStartGlyph

 protected abstract List<T> getSetOfRulesForStartGlyph 
             (int startId) 
            

Gets a set of rules, which start with given glyph id.

Parameters:

startId - id of the first glyph in the sequence

Returns:

a list of ContextualSubstRule instances. The list will be empty if there are no rules that start with a given glyph id

checkIfContextMatch

 protected int checkIfContextMatch 
             (GlyphLine line, T rule) 
            

Checks if given glyph line matches given rule.

Parameters:

line - glyph line to be checked

rule - rule to be compared with a given glyph line

Returns:

either index which corresponds to the last glyph of the matching context inside the glyph line if context matches, or -1 if context doesn't match