com.itextpdf.io.font.otf

Class ContextualSubstRule

java.lang.Object

com.itextpdf.io.font.otf.ContextualSubstRule

All Implemented Interfaces:

Serializable

Direct Known Subclasses:

SubTableLookup5Format1.SubstRuleFormat1, SubTableLookup5Format2.SubstRuleFormat2, SubTableLookup5Format3.SubstRuleFormat3, SubTableLookup6Format1.SubstRuleFormat1, SubTableLookup6Format2.SubstRuleFormat2, SubTableLookup6Format3.SubstRuleFormat3

public abstract class ContextualSubstRule
extends Object
implements Serializable

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
ContextualSubstRule()

Method Summary

Modifier and Type	Method and Description
int	getBacktrackContextLength()
abstract int	getContextLength()
int	getLookaheadContextLength()
abstract SubstLookupRecord[]	getSubstLookupRecords()
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 Detail

ContextualSubstRule

public ContextualSubstRule()

Method Detail

getContextLength

public abstract int getContextLength()

Returns:

length of the context glyph sequence defined by this rule.

getSubstLookupRecords

public abstract SubstLookupRecord[] getSubstLookupRecords()

Returns:

an array of SubstLookupRecord. Each record specifies a position in the context glyph sequence and a LookupListIndex to the substitution lookup that is applied at that position.

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:

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

getLookaheadContextLength

public int getLookaheadContextLength()

Returns:

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

getBacktrackContextLength

public int getBacktrackContextLength()

Returns:

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

isGlyphMatchesLookahead

public boolean isGlyphMatchesLookahead(int glyphId,
                                       int atIdx)

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

Parameters:

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

isGlyphMatchesBacktrack

public boolean isGlyphMatchesBacktrack(int glyphId,
                                       int atIdx)

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

Parameters:

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