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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 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);

Bit mask- and enum-based Unicode ranges

This class supports two different programming interfaces to represent Unicode ranges for script-specific digits: bit mask-based ones, such as NumericShaper.ARABIC, and enum-based ones, such as NumericShaper.Range.ARABIC. Multiple ranges can be specified by ORing bit mask-based constants, such as:

NumericShaper.ARABIC | NumericShaper.TAMIL

or creating a Set with the NumericShaper.Range constants, such as:

EnumSet.of(NumericShaper.Scirpt.ARABIC, NumericShaper.Range.TAMIL)

The enum-based ranges are a super set of the bit mask-based ones.

If the two interfaces are mixed (including serialization), Unicode range values are mapped to their counterparts where such mapping is possible, such as NumericShaper.Range.ARABIC from/to NumericShaper.ARABIC. If any unmappable range values are specified, such as NumericShaper.Range.BALINESE, those ranges are ignored.

Decimal Digits Precedence

A Unicode range may have more than one set of decimal digits. If multiple decimal digits sets are specified for the same Unicode range, one of the sets will take precedence as follows.

Unicode Range	`NumericShaper` Constants	Precedence
Arabic	`NumericShaper.ARABIC` `NumericShaper.EASTERN_ARABIC`	`NumericShaper.EASTERN_ARABIC`
Arabic	`NumericShaper.Range.ARABIC` `NumericShaper.Range.EASTERN_ARABIC`	`NumericShaper.Range.EASTERN_ARABIC`
Tai Tham	`NumericShaper.Range.TAI_THAM_HORA` `NumericShaper.Range.TAI_THAM_THAM`	`NumericShaper.Range.TAI_THAM_THAM`

Since:: 1.4

Nested Classes

Nested Classes
Modifier and Type	Class and Description
`static class`	`NumericShaper.Range` A `NumericShaper.Range` represents a Unicode range of a script having its own decimal digits.

Fields

EUROPEAN

public static final int EUROPEAN

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

ARABIC

public static final int ARABIC

Identifies the ARABIC range and decimal base.

EASTERN_ARABIC

public static final int EASTERN_ARABIC

Identifies the ARABIC range and ARABIC_EXTENDED decimal base.

DEVANAGARI

public static final int DEVANAGARI

Identifies the DEVANAGARI range and decimal base.

BENGALI

public static final int BENGALI

Identifies the BENGALI range and decimal base.

GURMUKHI

public static final int GURMUKHI

Identifies the GURMUKHI range and decimal base.

GUJARATI

public static final int GUJARATI

Identifies the GUJARATI range and decimal base.

ORIYA

public static final int ORIYA

Identifies the ORIYA range and decimal base.

TAMIL

public static final int TAMIL

Identifies the TAMIL range and decimal base.

TELUGU

public static final int TELUGU

Identifies the TELUGU range and decimal base.

KANNADA

public static final int KANNADA

Identifies the KANNADA range and decimal base.

MALAYALAM

public static final int MALAYALAM

Identifies the MALAYALAM range and decimal base.

THAI

public static final int THAI

Identifies the THAI range and decimal base.

LAO

public static final int LAO

Identifies the LAO range and decimal base.

TIBETAN

public static final int TIBETAN

Identifies the TIBETAN range and decimal base.

MYANMAR

public static final int MYANMAR

Identifies the MYANMAR range and decimal base.

ETHIOPIC

public static final int ETHIOPIC

Identifies the ETHIOPIC range and decimal base.

KHMER

public static final int KHMER

Identifies the KHMER range and decimal base.

MONGOLIAN

public static final int MONGOLIAN

Identifies the MONGOLIAN range and decimal base.

ALL_RANGES

public static final int ALL_RANGES

Identifies all ranges, for full contextual shaping.

This constant specifies all of the bit mask-based ranges. Use EmunSet.allOf(NumericShaper.Range.class) to specify all of the enum-based ranges.

Methods

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

getShaper

public static NumericShaper getShaper(NumericShaper.Range singleRange)

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

Parameters:: singleRange - the Unicode range given by a NumericShaper.Range constant.
Returns:: a non-contextual NumericShaper.
Throws:: NullPointerException - if singleRange is null
Since:: 1.7

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(Set<NumericShaper.Range> ranges)

Returns a contextual shaper for the provided Unicode range(s). The 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.

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 contextual shaper for the specified ranges
Throws:: NullPointerException - if ranges is null.
Since:: 1.7

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.

getContextualShaper

public static NumericShaper getContextualShaper(Set<NumericShaper.Range> ranges,
                                                NumericShaper.Range defaultContext)

Returns a contextual shaper for the provided Unicode range(s). The 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. The shaper uses defaultContext as the starting context.

Parameters:: ranges - the specified Unicode ranges; defaultContext - the starting context, such as NumericShaper.Range.EUROPEAN
Returns:: a contextual shaper for the specified Unicode ranges.
Throws:: NullPointerException - if ranges or defaultContext is null
Since:: 1.7

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.

shape

public void shape(char[] text,
                  int start,
                  int count,
                  NumericShaper.Range 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 - a char array; start - the index into text to start converting; count - the number of chars in text to convert; context - the context to which to convert the characters, such as NumericShaper.Range.EUROPEAN
Throws:: IndexOutOfBoundsException - if start or start + count is out of bounds; NullPointerException - if text or context is null
Since:: 1.7

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) &#123; ...

Note that this method supports only the bit mask-based ranges. Call getRangeSet() for the enum-based ranges.

Returns:: the values for all the ranges to be shaped.

getRangeSet

public Set<NumericShaper.Range> getRangeSet()

Returns a Set representing all the Unicode ranges in this NumericShaper that will be shaped.

Returns:: all the Unicode ranges to be shaped.
Since:: 1.7

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, regardless of the range representations, the bit mask or the enum. For example, the following code produces "true".

NumericShaper ns1 = NumericShaper.getShaper(NumericShaper.ARABIC);
NumericShaper ns2 = NumericShaper.getShaper(NumericShaper.Range.ARABIC);
System.out.println(ns1.equals(ns2));

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.

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