java.awt.font
Class NumericShaper

java.lang.Object
  java.awt.font.NumericShaper

All Implemented Interfaces:

Serializable

public final class NumericShaper

extends Object

implements Serializable

The NumericShaper class is used to convert Latin-1 (European) digits to other Unicode decimal digits. Users of this class will primarily be people who wish to present data using national digit shapes, but find it more convenient to represent the data internally using Latin-1 (European) digits. This does not interpret the deprecated numeric shape selector character (U+206E).

Instances of NumericShaper are typically applied as attributes to text with the NUMERIC_SHAPING attribute of the TextAttribute class. For example, this code snippet causes a TextLayout to shape European digits to Arabic in an Arabic context:

 Map map = new HashMap();
 map.put(TextAttribute.NUMERIC_SHAPING, 
     NumericShaper.getContextualShaper(NumericShaper.ARABIC));
 FontRenderContext frc = ...;
 TextLayout layout = new TextLayout(text, map, frc);
 layout.draw(g2d, x, y);
 

It is also possible to perform numeric shaping explicitly using instances of NumericShaper, as this code snippet demonstrates:

   char[] text = ...;
   // shape all EUROPEAN digits (except zero) to ARABIC digits
   NumericShaper shaper = NumericShaper.getShaper(NumericShaper.ARABIC);
   shaper.shape(text, start, count);

   // shape European digits to ARABIC digits if preceeding text is Arabic, or
   // shape European digits to TAMIL digits if preceeding text is Tamil, or
   // leave European digits alone if there is no preceeding text, or 
   // preceeding text is neither Arabic nor Tamil
   NumericShaper shaper = 
      NumericShaper.getContextualShaper(NumericShaper.ARABIC | 
                                              NumericShaper.TAMIL,
                                              NumericShaper.EUROPEAN);
   shaper.shape(text. start, count);
 

Since:

1.4

See Also:

Serialized Form

Field Summary

static int	ALL_RANGES Identifies all ranges, for full contextual shaping.
static int	ARABIC Identifies the ARABIC range and decimal base.
private static int	ARABIC_KEY
private static char[]	bases
static int	BENGALI Identifies the BENGALI range and decimal base.
private static int	BENGALI_KEY
private static char[]	contexts
private static int	CONTEXTUAL_MASK
private static int	ctCache
private static int	ctCacheLimit
static int	DEVANAGARI Identifies the DEVANAGARI range and decimal base.
private static int	DEVANAGARI_KEY
static int	EASTERN_ARABIC Identifies the ARABIC range and ARABIC_EXTENDED decimal base.
private static int	EASTERN_ARABIC_KEY
static int	ETHIOPIC Identifies the ETHIOPIC range and decimal base.
private static int	ETHIOPIC_KEY
static int	EUROPEAN Identifies the Latin-1 (European) and extended range, and Latin-1 (European) decimal base.
private static int	EUROPEAN_KEY
static int	GUJARATI Identifies the GUJARATI range and decimal base.
private static int	GUJARATI_KEY
static int	GURMUKHI Identifies the GURMUKHI range and decimal base.
private static int	GURMUKHI_KEY
static int	KANNADA Identifies the KANNADA range and decimal base.
private static int	KANNADA_KEY
private int	key index of context for contextual shaping - values range from 0 to 18
private static String[]	keyNames
static int	KHMER Identifies the KHMER range and decimal base.
private static int	KHMER_KEY
static int	LAO Identifies the LAO range and decimal base.
private static int	LAO_KEY
static int	MALAYALAM Identifies the MALAYALAM range and decimal base.
private static int	MALAYALAM_KEY
private int	mask flag indicating whether to shape contextually (high bit) and which digit ranges to shape (bits 0-18)
static int	MONGOLIAN Identifies the MONGOLIAN range and decimal base.
private static int	MONGOLIAN_KEY
static int	MYANMAR Identifies the MYANMAR range and decimal base.
private static int	MYANMAR_KEY
private static int	NUM_KEYS
static int	ORIYA Identifies the ORIYA range and decimal base.
private static int	ORIYA_KEY
private static int	stCache
private static char[]	strongTable
static int	TAMIL Identifies the TAMIL range and decimal base.
private static int	TAMIL_KEY
static int	TELUGU Identifies the TELUGU range and decimal base.
private static int	TELUGU_KEY
static int	THAI Identifies the THAI range and decimal base.
private static int	THAI_KEY
static int	TIBETAN Identifies the TIBETAN range and decimal base.
private static int	TIBETAN_KEY

Constructor Summary

private

NumericShaper(int key, int mask) Private constructor.

Method Summary

boolean	equals(Object o) Returns true if the specified object is an instance of NumericShaper and shapes identically to this one.
private static int	getContextKey(char c)
static NumericShaper	getContextualShaper(int ranges) Returns a contextual shaper for the provided unicode range(s).
static NumericShaper	getContextualShaper(int ranges, int defaultContext) Returns a contextual shaper for the provided unicode range(s).
private static int	getHighBit(int value) Returns the index of the high bit in value (assuming le, actually power of 2 >= value). value must be positive.
private static int	getKeyFromMask(int mask)
int	getRanges() Returns an int that ORs together the values for all the ranges that will be shaped.
static NumericShaper	getShaper(int singleRange) Returns a shaper for the provided unicode range.
int	hashCode() Returns a hash code for this shaper.
boolean	isContextual() Returns a boolean indicating whether or not this shaper shapes contextually.
private static boolean	isStrongDirectional(char c)
private static int	search(char value, char[] array, int start, int length) fast binary search over subrange of array.
void	shape(char[] text, int start, int count) Converts the digits in the text that occur between start and start + count.
void	shape(char[] text, int start, int count, int context) Converts the digits in the text that occur between start and start + count, using the provided context.
private void	shapeContextually(char[] text, int start, int count, int ctxKey) Perform contextual shaping.
private void	shapeNonContextually(char[] text, int start, int count) Perform non-contextual shaping.
String	toString() Returns a String that describes this shaper.

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

key

private int key

index of context for contextual shaping - values range from 0 to 18

mask

private int mask

flag indicating whether to shape contextually (high bit) and which digit ranges to shape (bits 0-18)

EUROPEAN

public static final int EUROPEAN

Identifies the Latin-1 (European) and extended range, and Latin-1 (European) decimal base.

See Also:

Constant Field Values

ARABIC

public static final int ARABIC

Identifies the ARABIC range and decimal base.

See Also:

Constant Field Values

EASTERN_ARABIC

public static final int EASTERN_ARABIC

Identifies the ARABIC range and ARABIC_EXTENDED decimal base.

See Also:

Constant Field Values

DEVANAGARI

public static final int DEVANAGARI

Identifies the DEVANAGARI range and decimal base.

See Also:

Constant Field Values

BENGALI

public static final int BENGALI

Identifies the BENGALI range and decimal base.

See Also:

Constant Field Values

GURMUKHI

public static final int GURMUKHI

Identifies the GURMUKHI range and decimal base.

See Also:

Constant Field Values

GUJARATI

public static final int GUJARATI

Identifies the GUJARATI range and decimal base.

See Also:

Constant Field Values

ORIYA

public static final int ORIYA

Identifies the ORIYA range and decimal base.

See Also:

Constant Field Values

TAMIL

public static final int TAMIL

Identifies the TAMIL range and decimal base. Tamil does not have a decimal digit 0 so Latin-1 (European) 0 is used.

See Also:

Constant Field Values

TELUGU

public static final int TELUGU

Identifies the TELUGU range and decimal base.

See Also:

Constant Field Values

KANNADA

public static final int KANNADA

Identifies the KANNADA range and decimal base.

See Also:

Constant Field Values

MALAYALAM

public static final int MALAYALAM

Identifies the MALAYALAM range and decimal base.

See Also:

Constant Field Values

THAI

public static final int THAI

Identifies the THAI range and decimal base.

See Also:

Constant Field Values

LAO

public static final int LAO

Identifies the LAO range and decimal base.

See Also:

Constant Field Values

TIBETAN

public static final int TIBETAN

Identifies the TIBETAN range and decimal base.

See Also:

Constant Field Values

MYANMAR

public static final int MYANMAR

Identifies the MYANMAR range and decimal base.

See Also:

Constant Field Values

ETHIOPIC

public static final int ETHIOPIC

Identifies the ETHIOPIC range and decimal base.

See Also:

Constant Field Values

KHMER

public static final int KHMER

Identifies the KHMER range and decimal base.

See Also:

Constant Field Values

MONGOLIAN

public static final int MONGOLIAN

Identifies the MONGOLIAN range and decimal base.

See Also:

Constant Field Values

ALL_RANGES

public static final int ALL_RANGES

Identifies all ranges, for full contextual shaping.

See Also:

Constant Field Values

EUROPEAN_KEY

private static final int EUROPEAN_KEY

See Also:

Constant Field Values

ARABIC_KEY

private static final int ARABIC_KEY

See Also:

Constant Field Values

EASTERN_ARABIC_KEY

private static final int EASTERN_ARABIC_KEY

See Also:

Constant Field Values

DEVANAGARI_KEY

private static final int DEVANAGARI_KEY

See Also:

Constant Field Values

BENGALI_KEY

private static final int BENGALI_KEY

See Also:

Constant Field Values

GURMUKHI_KEY

private static final int GURMUKHI_KEY

See Also:

Constant Field Values

GUJARATI_KEY

private static final int GUJARATI_KEY

See Also:

Constant Field Values

ORIYA_KEY

private static final int ORIYA_KEY

See Also:

Constant Field Values

TAMIL_KEY

private static final int TAMIL_KEY

See Also:

Constant Field Values

TELUGU_KEY

private static final int TELUGU_KEY

See Also:

Constant Field Values

KANNADA_KEY

private static final int KANNADA_KEY

See Also:

Constant Field Values

MALAYALAM_KEY

private static final int MALAYALAM_KEY

See Also:

Constant Field Values

THAI_KEY

private static final int THAI_KEY

See Also:

Constant Field Values

LAO_KEY

private static final int LAO_KEY

See Also:

Constant Field Values

TIBETAN_KEY

private static final int TIBETAN_KEY

See Also:

Constant Field Values

MYANMAR_KEY

private static final int MYANMAR_KEY

See Also:

Constant Field Values

ETHIOPIC_KEY

private static final int ETHIOPIC_KEY

See Also:

Constant Field Values

KHMER_KEY

private static final int KHMER_KEY

See Also:

Constant Field Values

MONGOLIAN_KEY

private static final int MONGOLIAN_KEY

See Also:

Constant Field Values

NUM_KEYS

private static final int NUM_KEYS

See Also:

Constant Field Values

keyNames

private static final String[] keyNames

CONTEXTUAL_MASK

private static final int CONTEXTUAL_MASK

See Also:

Constant Field Values

bases

private static final char[] bases

contexts

private static final char[] contexts

ctCache

private static int ctCache

ctCacheLimit

private static int ctCacheLimit

strongTable

private static char[] strongTable

stCache

private static int stCache

Constructor Detail

NumericShaper

private NumericShaper(int key,
                      int mask)

Private constructor.

Method Detail

getContextKey

private static int getContextKey(char c)

isStrongDirectional

private static boolean isStrongDirectional(char c)

getKeyFromMask

private static int getKeyFromMask(int mask)

getShaper

public static NumericShaper getShaper(int singleRange)

Returns a shaper for the provided unicode range. All Latin-1 (EUROPEAN) digits are converted to the corresponding decimal unicode digits.

Parameters:

singleRange - the specified Unicode range

Returns:

a non-contextual numeric shaper

Throws:

IllegalArgumentException - if the range is not a single range

getContextualShaper

public static NumericShaper getContextualShaper(int ranges)

Returns a contextual shaper for the provided unicode range(s). Latin-1 (EUROPEAN) digits are converted to the decimal digits corresponding to the range of the preceeding text, if the range is one of the provided ranges. Multiple ranges are represented by or-ing the values together, such as, NumericShaper.ARABIC | NumericShaper.THAI. The shaper assumes EUROPEAN as the starting context, that is, if EUROPEAN digits are encountered before any strong directional text in the string, the context is presumed to be EUROPEAN, and so the digits will not shape.

Parameters:

ranges - the specified Unicode ranges

Returns:

a shaper for the specified ranges

getContextualShaper

public static NumericShaper getContextualShaper(int ranges,
                                                int defaultContext)

Returns a contextual shaper for the provided unicode range(s). Latin-1 (EUROPEAN) digits will be converted to the decimal digits corresponding to the range of the preceeding text, if the range is one of the provided ranges. Multiple ranges are represented by or-ing the values together, for example, NumericShaper.ARABIC | NumericShaper.THAI. The shaper uses defaultContext as the starting context.

Parameters:

ranges - the specified Unicode ranges

defaultContext - the starting context, such as NumericShaper.EUROPEAN

Returns:

a shaper for the specified Unicode ranges.

shape

public void shape(char[] text,
                  int start,
                  int count)

Converts the digits in the text that occur between start and start + count.

Parameters:

text - an array of characters to convert

start - the index into text to start converting

count - the number of characters in text to convert

shape

public void shape(char[] text,
                  int start,
                  int count,
                  int context)

Converts the digits in the text that occur between start and start + count, using the provided context. Context is ignored if the shaper is not a contextual shaper.

Parameters:

text - an array of characters

start - the index into text to start converting

count - the number of characters in text to convert

context - the context to which to convert the characters, such as NumericShaper.EUROPEAN

isContextual

public boolean isContextual()

Returns a boolean indicating whether or not this shaper shapes contextually.

Returns:

true if this shaper is contextual; false otherwise.

getRanges

public int getRanges()

Returns an int that ORs together the values for all the ranges that will be shaped.

For example, to check if a shaper shapes to Arabic, you would use the following:

if ((shaper.getRanges() & shaper.ARABIC) != 0) { ...

Returns:

the values for all the ranges to be shaped.

shapeNonContextually

private void shapeNonContextually(char[] text,
                                  int start,
                                  int count)

Perform non-contextual shaping.

shapeContextually

private void shapeContextually(char[] text,
                               int start,
                               int count,
                               int ctxKey)

Perform contextual shaping. Synchronized to protect caches used in getContextKey and isStrongDirectional.

hashCode

public int hashCode()

Returns a hash code for this shaper.

Overrides:

hashCode in class Object

Returns:

this shaper's hash code.

See Also:

Object.hashCode()

equals

public boolean equals(Object o)

Returns true if the specified object is an instance of NumericShaper and shapes identically to this one.

Overrides:

equals in class Object

Parameters:

o - the specified object to compare to this NumericShaper

Returns:

true if o is an instance of NumericShaper and shapes in the same way; false otherwise.

See Also:

Object.equals(java.lang.Object)

toString

public String toString()

Returns a String that describes this shaper. This method is used for debugging purposes only.

Overrides:

toString in class Object

Returns:

a String describing this shaper.

getHighBit

private static int getHighBit(int value)

Returns the index of the high bit in value (assuming le, actually power of 2 >= value). value must be positive.

search

private static int search(char value,
                          char[] array,
                          int start,
                          int length)

fast binary search over subrange of array.