com.itextpdf.io.font.otf

Class ContextualSubTable

java.lang.Object

com.itextpdf.io.font.otf.ContextualSubTable

All Implemented Interfaces:

Serializable

Direct Known Subclasses:

SubTableLookup5Format1, SubTableLookup5Format2, SubTableLookup5Format3, SubTableLookup6

public abstract class ContextualSubTable
extends Object
implements Serializable

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
protected int	lookupFlag
protected OpenTypeFontTableReader	openReader

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	ContextualSubTable(OpenTypeFontTableReader openReader, int lookupFlag)

Method Summary

Modifier and Type	Method and Description
protected int	checkIfContextMatch(GlyphLine line, ContextualSubstRule rule) Checks if given glyph line at the given position matches given rule.
ContextualSubstRule	getMatchingContextRule(GlyphLine line) Gets a most preferable context rule that matches the line at current position.
protected abstract List<ContextualSubstRule>	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 Detail

openReader

protected OpenTypeFontTableReader openReader

lookupFlag

protected int lookupFlag

Constructor Detail

ContextualSubTable

protected ContextualSubTable(OpenTypeFontTableReader openReader,
                             int lookupFlag)

Method Detail

getMatchingContextRule

public ContextualSubstRule 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<ContextualSubstRule> getSetOfRulesForStartGlyph(int startId)

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

Parameters:

startId - id of the first glyph in the sequence.

checkIfContextMatch

protected int checkIfContextMatch(GlyphLine line,
                                  ContextualSubstRule rule)

Checks if given glyph line at the given position matches given rule.

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.