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## org.apache.fop.complexscripts.fonts
Class GlyphSubstitutionTable

    java.lang.Object
      org.apache.fop.complexscripts.fonts.GlyphTable
          org.apache.fop.complexscripts.fonts.GlyphSubstitutionTable

    public class GlyphSubstitutionTable

extends GlyphTable

The `GlyphSubstitutionTable` class is a glyph table that implements `GlyphSubstitution` functionality.

This work was originally authored by Glenn Adams (gadams@apache.org).

Nested Class Summary
`static class` | `GlyphSubstitutionTable.Ligature` The `Ligature` class implements a ligature lookup result in terms of a ligature glyph (code) and the N+1... components that comprise the ligature, where the Nth component was consumed in the coverage table lookup mapping to this ligature instance.
`static class` | `GlyphSubstitutionTable.LigatureSet` The `LigatureSet` class implements a set of ligatures.

Nested classes/interfaces inherited from class org.apache.fop.complexscripts.fonts.GlyphTable
`GlyphTable.ChainedClassSequenceRule, GlyphTable.ChainedCoverageSequenceRule, GlyphTable.ChainedGlyphSequenceRule, GlyphTable.ClassSequenceRule, GlyphTable.CoverageSequenceRule, GlyphTable.GlyphSequenceRule, GlyphTable.HomogeneousRuleSet, GlyphTable.LookupSpec, GlyphTable.LookupTable, GlyphTable.Rule, GlyphTable.RuleLookup, GlyphTable.RuleSet, GlyphTable.UseSpec`

Field Summary
`static int` | `GSUB_LOOKUP_TYPE_ALTERNATE` alternate substitution subtable type
`static int` | `GSUB_LOOKUP_TYPE_CHAINED_CONTEXTUAL` chained contextual substitution subtable type
`static int` | `GSUB_LOOKUP_TYPE_CONTEXTUAL` contextual substitution subtable type
`static int` | `GSUB_LOOKUP_TYPE_EXTENSION_SUBSTITUTION` extension substitution substitution subtable type
`static int` | `GSUB_LOOKUP_TYPE_LIGATURE` ligature substitution subtable type
`static int` | `GSUB_LOOKUP_TYPE_MULTIPLE` multiple substitution subtable type
`static int` | `GSUB_LOOKUP_TYPE_REVERSE_CHAINED_SINGLE` reverse chained contextual single substitution subtable type
`static int` | `GSUB_LOOKUP_TYPE_SINGLE` single substitution subtable type

Fields inherited from class org.apache.fop.complexscripts.fonts.GlyphTable
`GLYPH_TABLE_TYPE_BASELINE, GLYPH_TABLE_TYPE_DEFINITION, GLYPH_TABLE_TYPE_JUSTIFICATION, GLYPH_TABLE_TYPE_POSITIONING, GLYPH_TABLE_TYPE_SUBSTITUTION`

Constructor Summary
`GlyphSubstitutionTable(GlyphDefinitionTable gdef, java.util.Map lookups, java.util.List subtables)` Instantiate a `GlyphSubstitutionTable` object using the specified lookups and subtables.

Method Summary
`static GlyphSubtable` | `createSubtable(int type, java.lang.String id, int sequence, int flags, int format, GlyphCoverageTable coverage, java.util.List entries)` Create a substitution subtable according to the specified arguments.
`static GlyphSubtable` | `createSubtable(int type, java.lang.String id, int sequence, int flags, int format, java.util.List coverage, java.util.List entries)` Create a substitution subtable according to the specified arguments.
`static int` | `getLookupTypeFromName(java.lang.String name)` Map a lookup type name to its constant (integer) value.
`static java.lang.String` | `getLookupTypeName(int type)` Map a lookup type constant (integer) value to its name.
`GlyphSequence` | `substitute(GlyphSequence gs, java.lang.String script, java.lang.String language)` Perform substitution processing using all matching lookups.

Methods inherited from class org.apache.fop.complexscripts.fonts.GlyphTable
`addSubtable, assembleLookups, findLookupTables, freezeSubtables, getGlyphDefinitions, getLookups, getLookupTable, getLookupTables, getTableTypeFromName, matchLookups, matchLookupSpecs, resolveLookupReferences, toString`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

Field Detail

### GSUB_LOOKUP_TYPE_SINGLE

    public static final int GSUB_LOOKUP_TYPE_SINGLE

  single substitution subtable type

  See Also:
    Constant Field Values

### GSUB_LOOKUP_TYPE_MULTIPLE

    public static final int GSUB_LOOKUP_TYPE_MULTIPLE

  multiple substitution subtable type

  See Also:
    Constant Field Values

### GSUB_LOOKUP_TYPE_ALTERNATE

    public static final int GSUB_LOOKUP_TYPE_ALTERNATE

  alternate substitution subtable type

  See Also:
    Constant Field Values

### GSUB_LOOKUP_TYPE_LIGATURE

    public static final int GSUB_LOOKUP_TYPE_LIGATURE

  ligature substitution subtable type

  See Also:
    Constant Field Values

### GSUB_LOOKUP_TYPE_CONTEXTUAL

    public static final int GSUB_LOOKUP_TYPE_CONTEXTUAL

  contextual substitution subtable type

  See Also:
    Constant Field Values

### GSUB_LOOKUP_TYPE_CHAINED_CONTEXTUAL

    public static final int GSUB_LOOKUP_TYPE_CHAINED_CONTEXTUAL

  chained contextual substitution subtable type

  See Also:
    Constant Field Values

### GSUB_LOOKUP_TYPE_EXTENSION_SUBSTITUTION

    public static final int GSUB_LOOKUP_TYPE_EXTENSION_SUBSTITUTION

  extension substitution substitution subtable type

  See Also:
    Constant Field Values

### GSUB_LOOKUP_TYPE_REVERSE_CHAINED_SINGLE

    public static final int GSUB_LOOKUP_TYPE_REVERSE_CHAINED_SINGLE

  reverse chained contextual single substitution subtable type

  See Also:
    Constant Field Values

Constructor Detail

### GlyphSubstitutionTable

    public GlyphSubstitutionTable(GlyphDefinitionTable gdef,
                                  java.util.Map lookups,
                                  java.util.List subtables)

  Instantiate a `GlyphSubstitutionTable` object using the specified lookups and subtables.

  Parameters:
    `gdef` - glyph definition table that applies
    `lookups` - a map of lookup specifications to subtable identifier strings
    `subtables` - a list of identified subtables

Method Detail

### substitute

    public GlyphSequence substitute(GlyphSequence gs,
                                    java.lang.String script,
                                    java.lang.String language)

  Perform substitution processing using all matching lookups.

  Parameters:
    `gs` - an input glyph sequence
    `script` - a script identifier
    `language` - a language identifier
  Returns:
    the substituted (output) glyph sequence

### getLookupTypeFromName

    public static int getLookupTypeFromName(java.lang.String name)

  Map a lookup type name to its constant (integer) value.

  Parameters:
    `name` - lookup type name
  Returns:
    lookup type

### getLookupTypeName

    public static java.lang.String getLookupTypeName(int type)

  Map a lookup type constant (integer) value to its name.

  Parameters:
    `type` - lookup type
  Returns:
    lookup type name

### createSubtable

    public static GlyphSubtable createSubtable(int type,
                                               java.lang.String id,
                                               int sequence,
                                               int flags,
                                               int format,
                                               GlyphCoverageTable coverage,
                                               java.util.List entries)

  Create a substitution subtable according to the specified arguments.

  Parameters:
    `type` - subtable type
    `id` - subtable identifier
    `sequence` - subtable sequence
    `flags` - subtable flags
    `format` - subtable format
    `coverage` - subtable coverage table
    `entries` - subtable entries
  Returns:
    a glyph subtable instance

### createSubtable

    public static GlyphSubtable createSubtable(int type,
                                               java.lang.String id,
                                               int sequence,
                                               int flags,
                                               int format,
                                               java.util.List coverage,
                                               java.util.List entries)

  Create a substitution subtable according to the specified arguments.

  Parameters:
    `type` - subtable type
    `id` - subtable identifier
    `sequence` - subtable sequence
    `flags` - subtable flags
    `format` - subtable format
    `coverage` - list of coverage table entries
    `entries` - subtable entries
  Returns:
    a glyph subtable instance

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