Java™ Platform
Standard Ed. 6

java.awt.font
Class NumericShaper

java.lang.Object
  extended by 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 preceding text is Arabic, or
   // shape European digits to TAMIL digits if preceding text is Tamil, or
   // leave European digits alone if there is no preceding text, or 
   // preceding 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.
static int BENGALI
          Identifies the BENGALI range and decimal base.
static int DEVANAGARI
          Identifies the DEVANAGARI range and decimal base.
static int EASTERN_ARABIC
          Identifies the ARABIC range and ARABIC_EXTENDED decimal base.
static int ETHIOPIC
          Identifies the ETHIOPIC range and decimal base.
static int EUROPEAN
          Identifies the Latin-1 (European) and extended range, and Latin-1 (European) decimal base.
static int GUJARATI
          Identifies the GUJARATI range and decimal base.
static int GURMUKHI
          Identifies the GURMUKHI range and decimal base.
static int KANNADA
          Identifies the KANNADA range and decimal base.
static int KHMER
          Identifies the KHMER range and decimal base.
static int LAO
          Identifies the LAO range and decimal base.
static int MALAYALAM
          Identifies the MALAYALAM range and decimal base.
static int MONGOLIAN
          Identifies the MONGOLIAN range and decimal base.
static int MYANMAR
          Identifies the MYANMAR range and decimal base.
static int ORIYA
          Identifies the ORIYA range and decimal base.
static int TAMIL
          Identifies the TAMIL range and decimal base.
static int TELUGU
          Identifies the TELUGU range and decimal base.
static int THAI
          Identifies the THAI range and decimal base.
static int TIBETAN
          Identifies the TIBETAN range and decimal base.
 
Method Summary
 boolean equals(Object o)
          Returns true if the specified object is an instance of NumericShaper and shapes identically to this one.
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).
 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.
 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.
 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

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
Method Detail

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 preceding 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 preceding 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.
Throws:
IllegalArgumentException - if the specified defaultContext is not a single valid range.

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
Throws:
IndexOutOfBoundsException - if start or start + count is out of bounds
NullPointerException - if text is null

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
Throws:
IndexOutOfBoundsException - if start or start + count is out of bounds
NullPointerException - if text is null
IllegalArgumentException - if this is a contextual shaper and the specified context is not a single valid range.

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.

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.

Java™ Platform
Standard Ed. 6

Submit a bug or feature
For further API reference and developer documentation, see Java SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

Copyright © 1993, 2011, Oracle and/or its affiliates. All rights reserved.

Scripting on this page tracks web page traffic, but does not change the content in any way.