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

    java.lang.Object
      org.apache.fop.complexscripts.fonts.GlyphSubtable

All Implemented Interfaces:
  java.lang.Comparable

Direct Known Subclasses:
  GlyphDefinitionSubtable, GlyphPositioningSubtable, GlyphSubstitutionSubtable

    public abstract class GlyphSubtable

extends java.lang.Object
implements java.lang.Comparable

The `GlyphSubtable` implements an abstract glyph subtable that encapsulates identification, type, format, and coverage information.

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

Field Summary
`static int` | `LF_IGNORE_BASE` lookup flag - ignore base glyphs
`static int` | `LF_IGNORE_LIGATURE` lookup flag - ignore ligatures
`static int` | `LF_IGNORE_MARK` lookup flag - ignore marks
`static int` | `LF_INTERNAL_USE_REVERSE_SCAN` internal flag - use reverse scan
`static int` | `LF_MARK_ATTACHMENT_TYPE` lookup flag - mark attachment type
`static int` | `LF_RESERVED` lookup flag - reserved
`static int` | `LF_RIGHT_TO_LEFT` lookup flag - right to left
`static int` | `LF_USE_MARK_FILTERING_SET` lookup flag - use mark filtering set

Constructor Summary
`protected` | `GlyphSubtable(java.lang.String lookupId, int sequence, int flags, int format, GlyphMappingTable mapping)` Instantiate this glyph subtable.

Method Summary
`int` | `compareTo(java.lang.Object o)`
`boolean` | `equals(java.lang.Object o)`
`GlyphClassMapping` | `getClasses()`
`GlyphCoverageMapping` | `getCoverage()`
`int` | `getCoverageIndex(int gid)` Map glyph id to coverage index.
`int` | `getCoverageSize()` Map glyph id to coverage index.
`abstract java.util.List` | `getEntries()`
`int` | `getFlags()`
`static int` | `getFlags(GlyphSubtable[] subtables)` Determine consistent flags for a set of subtables.
`int` | `getFormat()`
`GlyphDefinitionTable` | `getGDEF()`
`java.lang.String` | `getLookupId()`
`int` | `getSequence()`
`GlyphTable` | `getTable()`
`abstract int` | `getTableType()`
`abstract int` | `getType()`
`abstract java.lang.String` | `getTypeName()`
`int` | `hashCode()`
`abstract boolean` | `isCompatible(GlyphSubtable subtable)` Determine if a glyph subtable is compatible with this glyph subtable.
`void` | `resolveLookupReferences(java.util.Map lookupTables)` Resolve references to lookup tables, e.g., in RuleLookup, to the lookup tables themselves.
`void` | `setTable(GlyphTable table)` Establish a weak reference from this subtable to its parent table.
`abstract boolean` | `usesReverseScan()`
`static boolean` | `usesReverseScan(GlyphSubtable[] subtables)` Determine if any of the specified subtables uses reverse scanning.

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

Field Detail

### LF_RIGHT_TO_LEFT

    public static final int LF_RIGHT_TO_LEFT

  lookup flag - right to left

  See Also:
    Constant Field Values

### LF_IGNORE_BASE

    public static final int LF_IGNORE_BASE

  lookup flag - ignore base glyphs

  See Also:
    Constant Field Values

### LF_IGNORE_LIGATURE

    public static final int LF_IGNORE_LIGATURE

  lookup flag - ignore ligatures

  See Also:
    Constant Field Values

### LF_IGNORE_MARK

    public static final int LF_IGNORE_MARK

  lookup flag - ignore marks

  See Also:
    Constant Field Values

### LF_USE_MARK_FILTERING_SET

    public static final int LF_USE_MARK_FILTERING_SET

  lookup flag - use mark filtering set

  See Also:
    Constant Field Values

### LF_RESERVED

    public static final int LF_RESERVED

  lookup flag - reserved

  See Also:
    Constant Field Values

### LF_MARK_ATTACHMENT_TYPE

    public static final int LF_MARK_ATTACHMENT_TYPE

  lookup flag - mark attachment type

  See Also:
    Constant Field Values

### LF_INTERNAL_USE_REVERSE_SCAN

    public static final int LF_INTERNAL_USE_REVERSE_SCAN

  internal flag - use reverse scan

  See Also:
    Constant Field Values

Constructor Detail

### GlyphSubtable

    protected GlyphSubtable(java.lang.String lookupId,
                            int sequence,
                            int flags,
                            int format,
                            GlyphMappingTable mapping)

  Instantiate this glyph subtable.

  Parameters:
    `lookupId` - lookup identifier, having form of "lu%d" where %d is index of lookup in lookup list
    `sequence` - subtable sequence (within lookup), starting with zero
    `flags` - subtable flags
    `format` - subtable format
    `mapping` - subtable mapping table

Method Detail

### getLookupId

    public java.lang.String getLookupId()

  Returns:
    this subtable's lookup identifer

### getTableType

    public abstract int getTableType()

  Returns:
    this subtable's table type

### getType

    public abstract int getType()

  Returns:
    this subtable's type

### getTypeName

    public abstract java.lang.String getTypeName()

  Returns:
    this subtable's type name

### isCompatible

    public abstract boolean isCompatible(GlyphSubtable subtable)

  Determine if a glyph subtable is compatible with this glyph subtable. Two glyph subtables are compatible if the both may appear in a single lookup table.

  Parameters:
    `subtable` - a glyph subtable to determine compatibility
  Returns:
    true if specified subtable is compatible with this glyph subtable, where by compatible is meant that they share the same lookup type

### usesReverseScan

    public abstract boolean usesReverseScan()

  Returns:
    true if subtable uses reverse scanning of glyph sequence, meaning from the last glyph in a glyph sequence to the first glyph

### getSequence

    public int getSequence()

  Returns:
    this subtable's sequence (index) within lookup

### getFlags

    public int getFlags()

  Returns:
    this subtable's flags

### getFormat

    public int getFormat()

  Returns:
    this subtable's format

### getGDEF

    public GlyphDefinitionTable getGDEF()

  Returns:
    this subtable's governing glyph definition table or null if none available

### getCoverage

    public GlyphCoverageMapping getCoverage()

  Returns:
    this subtable's coverage mapping or null if mapping is not a coverage mapping

### getClasses

    public GlyphClassMapping getClasses()

  Returns:
    this subtable's class mapping or null if mapping is not a class mapping

### getEntries

    public abstract java.util.List getEntries()

  Returns:
    this subtable's lookup entries

### getTable

    public GlyphTable getTable()

  Returns:
    this subtable's parent table (or null if undefined)

### setTable

    public void setTable(GlyphTable table)
                  throws java.lang.IllegalStateException

  Establish a weak reference from this subtable to its parent table. If table parameter is specified as `null`, then clear and remove weak reference.

  Parameters:
    `table` - the table or null
  Throws:
    `java.lang.IllegalStateException` - if table is already set to non-null

### resolveLookupReferences

    public void resolveLookupReferences(java.util.Map lookupTables)

  Resolve references to lookup tables, e.g., in RuleLookup, to the lookup tables themselves.

  Parameters:
    `lookupTables` - map from lookup table identifers, e.g. "lu4", to lookup tables

### getCoverageIndex

    public int getCoverageIndex(int gid)

  Map glyph id to coverage index.

  Parameters:
    `gid` - glyph id
  Returns:
    the corresponding coverage index of the specified glyph id

### getCoverageSize

    public int getCoverageSize()

  Map glyph id to coverage index.

  Returns:
    the corresponding coverage index of the specified glyph id

### hashCode

    public int hashCode()

  Overrides:
    `hashCode` in class `java.lang.Object`

### equals

    public boolean equals(java.lang.Object o)

  Overrides:
    `equals` in class `java.lang.Object`
  Returns:
    true if the lookup identifier and the sequence number of the specified subtable is the same as the lookup identifier and sequence number of this subtable

### compareTo

    public int compareTo(java.lang.Object o)

  Specified by:
    `compareTo` in interface `java.lang.Comparable`
  Returns:
    the result of comparing the lookup identifier and the sequence number of the specified subtable with the lookup identifier and sequence number of this subtable

### usesReverseScan

    public static boolean usesReverseScan(GlyphSubtable[] subtables)

  Determine if any of the specified subtables uses reverse scanning.

  Parameters:
    `subtables` - array of glyph subtables
  Returns:
    true if any of the specified subtables uses reverse scanning.

### getFlags

    public static int getFlags(GlyphSubtable[] subtables)
                        throws java.lang.IllegalStateException

  Determine consistent flags for a set of subtables.

  Parameters:
    `subtables` - array of glyph subtables
  Returns:
    consistent flags
  Throws:
    `java.lang.IllegalStateException` - if inconsistent flags

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