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Java Source Code / Java Documentation » Internationalization Localization » icu4j » com.ibm.icu.text 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.lang.Object
   com.ibm.icu.text.ComposedCharIter

ComposedCharIter
final public class ComposedCharIter (Code)
ComposedCharIter is an iterator class that returns all of the precomposed characters defined in the Unicode standard, along with their decomposed forms. This is often useful when building data tables (e.g. collation tables) which need to treat composed and decomposed characters equivalently.

For example, imagine that you have built a collation table with ordering rules for the Normalizer.DECOMP canonically decomposed forms of all characters used in a particular language. When you process input text using this table, the text must first be decomposed so that it matches the form used in the table. This can impose a performance penalty that may be unacceptable in some situations.

You can avoid this problem by ensuring that the collation table contains rules for both the decomposed and composed versions of each character. To do so, use a ComposedCharIter to iterate through all of the composed characters in Unicode. If the decomposition for that character consists solely of characters that are listed in your ruleset, you can add a new rule for the composed character that makes it equivalent to its decomposition sequence.

Note that ComposedCharIter iterates over a static table of the composed characters in Unicode. If you want to iterate over the composed characters in a particular string, use Normalizer instead.

When constructing a ComposedCharIter there is one optional feature that you can enable or disable:

  • Normalizer.IGNORE_HANGUL - Do not iterate over the Hangul characters and their corresponding Jamo decompositions. This option is off by default (i.e. Hangul processing is enabled) since the Unicode standard specifies that Hangul to Jamo is a canonical decomposition.

ComposedCharIter is currently based on version 2.1.8 of the Unicode Standard. It will be updated as later versions of Unicode are released.



Field Summary
final public static  charDONE
     Constant that indicates the iteration has completed.

Constructor Summary
public  ComposedCharIter()
     Construct a new ComposedCharIter.
public  ComposedCharIter(boolean compat, int options)
     Constructs a non-default ComposedCharIter with optional behavior.


Parameters:
  compat - false for canonical decompositions only;true for both canonical and compatibilitydecompositions.
Parameters:
  options - Optional decomposition features.


Method Summary
public  Stringdecomposition()
     Returns the Unicode decomposition of the current character. This method returns the decomposition of the precomposed character most recently returned by ComposedCharIter.next .
public  booleanhasNext()
     Determines whether there any precomposed Unicode characters not yet returned by ComposedCharIter.next .
public  charnext()
     Returns the next precomposed Unicode character. Repeated calls to next return all of the precomposed characters defined by Unicode, in ascending order.

Field Detail
DONE
final public static char DONE(Code)
Constant that indicates the iteration has completed. ComposedCharIter.next returns this value when there are no more composed characters over which to iterate.




Constructor Detail
ComposedCharIter
public ComposedCharIter()(Code)
Construct a new ComposedCharIter. The iterator will return all Unicode characters with canonical decompositions, including Korean Hangul characters.



ComposedCharIter
public ComposedCharIter(boolean compat, int options)(Code)
Constructs a non-default ComposedCharIter with optional behavior.


Parameters:
  compat - false for canonical decompositions only;true for both canonical and compatibilitydecompositions.
Parameters:
  options - Optional decomposition features. Currently, the onlysupported option is Normalizer.IGNORE_HANGUL, whichcauses this ComposedCharIter not to iterateover the Hangul characters and their correspondingJamo decompositions.





Method Detail
decomposition
public String decomposition()(Code)
Returns the Unicode decomposition of the current character. This method returns the decomposition of the precomposed character most recently returned by ComposedCharIter.next . The resulting decomposition is affected by the settings of the options passed to the constructor.



hasNext
public boolean hasNext()(Code)
Determines whether there any precomposed Unicode characters not yet returned by ComposedCharIter.next .



next
public char next()(Code)
Returns the next precomposed Unicode character. Repeated calls to next return all of the precomposed characters defined by Unicode, in ascending order. After all precomposed characters have been returned, ComposedCharIter.hasNext will return false and further calls to next will return ComposedCharIter.DONE .



Methods inherited from java.lang.Object
native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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