com.itextpdf.io.font.otf

Class ContextualTable<T extends ContextualRule>

java.lang.Object

com.itextpdf.io.font.otf.ContextualTable<T>

Direct Known Subclasses:

ChainingContextualTable, PosTableLookup7Format2, SubTableLookup5Format1, SubTableLookup5Format2, SubTableLookup5Format3

public abstract class ContextualTable<T extends ContextualRule>
extends Object

Field Summary

Fields

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

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method and 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 Detail

openReader

protected OpenTypeFontTableReader openReader

lookupFlag

protected int lookupFlag

Constructor Detail

ContextualTable

protected ContextualTable(OpenTypeFontTableReader openReader,
                          int lookupFlag)

Method Detail

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