Examples of CollationElementIterator

com.ibm.icu.text.CollationElementIterator

cu-project.org/userguide/Collate_ServiceArchitecture.html"> user guide. An example of using the CollationElementIterator for collation ordering comparison is the class com.ibm.icu.text.StringSearch.

To construct a CollationElementIterator object, users call the method getCollationElementIterator() on a RuleBasedCollator that defines the desired sorting order.

Example:

 String testString = "This is a test"; RuleBasedCollator rbc = new RuleBasedCollator("&a<b"); CollationElementIterator iterator = rbc.getCollationElementIterator(testString); int primaryOrder = iterator.IGNORABLE; while (primaryOrder != iterator.NULLORDER) { int order = iterator.next(); if (order != iterator.IGNORABLE && order != iterator.NULLORDER) { // order is valid, not ignorable and we have not passed the end // of the iteration, we do something primaryOrder = CollationElementIterator.primaryOrder(order); System.out.println("Next primary order 0x" + Integer.toHexString(primaryOrder)); } }

This class is not subclassable

@see Collator @see RuleBasedCollator @see StringSearch @author Syn Wee Quek @stable ICU 2.8

java.text.CollationElementIterator
The CollationElementIterator class is used as an iterator to walk through each character of an international string. Use the iterator to return the ordering priority of the positioned character. The ordering priority of a character, which we refer to as a key, defines how a character is collated in the given collation object.
For example, consider the following in Spanish:
```
 "ca" -> the first key is key('c') and second key is key('a'). "cha" -> the first key is key('ch') and second key is key('a'). 
```
And in German,
```
 "\u00e4b"-> the first key is key('a'), the second key is key('e'), and the third key is key('b'). 
```
The key of a character is an integer composed of primary order(short), secondary order(byte), and tertiary order(byte). Java strictly defines the size and signedness of its primitive data types. Therefore, the static functions primaryOrder, secondaryOrder, and tertiaryOrder return int, short, and short respectively to ensure the correctness of the key value.
Example of the iterator usage,
```
 String testString = "This is a test"; RuleBasedCollator ruleBasedCollator = (RuleBasedCollator)Collator.getInstance(); CollationElementIterator collationElementIterator = ruleBasedCollator.getCollationElementIterator(testString); int primaryOrder = CollationElementIterator.primaryOrder(collationElementIterator.next()); 
```
CollationElementIterator.next returns the collation order of the next character. A collation order consists of primary order, secondary order and tertiary order. The data type of the collation order is int. The first 16 bits of a collation order is its primary order; the next 8 bits is the secondary order and the last 8 bits is the tertiary order. @see Collator @see RuleBasedCollator @version 1.24 07/27/98 @author Helena Shih, Laura Werner, Richard Gillam

Examples of java.text.CollationElementIterator

  
   
    
  private final int[] getFirstCaseDiff(final String text, final String pattern, final Locale locale){
        
        final CollationElementIterator targIter = m_collator.getCollationElementIterator(text);
        final CollationElementIterator patIter = m_collator.getCollationElementIterator(pattern);  
        int startTarg = -1;
        int endTarg = -1;
        int startPatt = -1;
        int endPatt = -1;
        final int done = getElement(CollationElementIterator.NULLORDER);
        int patternElement = 0, targetElement = 0;
        boolean getPattern = true, getTarget = true;
        
        while (true) { 
            if (getPattern){
                 startPatt = patIter.getOffset();
                 patternElement = getElement(patIter.next());
                 endPatt = patIter.getOffset();
            }
            if ((getTarget)){               
                 startTarg  = targIter.getOffset(); 
                 targetElement   = getElement(targIter.next()); 
                 endTarg  = targIter.getOffset();

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Examples of java.text.CollationElementIterator

  }
  
  private void orderComparision()
  {
    RuleBasedCollator c = (RuleBasedCollator)Collator.getInstance(Locale.US);
    CollationElementIterator iter = c.getCollationElementIterator("Foo");


    // given by the 1.5.0 jdk
    int [][] results = 
      {
       {5767169, 88, 0, 1},
       {6356992, 97, 0, 0},
       {6356992, 97, 0, 0}
      };
    
    int element;
    int i = 0;
    while ((element = iter.next()) != CollationElementIterator.NULLORDER)
      {
        
        int primary = CollationElementIterator.primaryOrder(element);
        int secondary = CollationElementIterator.secondaryOrder(element);
        int tertiary = CollationElementIterator.tertiaryOrder(element);

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Examples of java.text.CollationElementIterator

      // better to use a collator with hard-wired collation rules of
      // known quality.
      RuleBasedCollator en_USCollator = 
        new RuleBasedCollator(JDK_1_4_EN_US_RULES);


      CollationElementIterator iterator = 
        en_USCollator.getCollationElementIterator("abcdefg");


      // -------- methods -------- 
      checkOrder(iterator, 7, PRIMARY, "initial test");


      // reset()
      harness.checkPoint("reset()");
      iterator.reset();
      checkOrder(iterator, 7, PRIMARY, "initial test after reset()");


      // ------- check empty string --------
      iterator = en_USCollator.getCollationElementIterator("");
      harness.check (iterator.next(), CollationElementIterator.NULLORDER, 
         "next()");


      // ------- detailed checks of collation orders -------
      for (int i = 0; i < TEST_STRINGS.length; i++) {
  iterator = en_USCollator.getCollationElementIterator(TEST_STRINGS[i]);

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Examples of java.text.CollationElementIterator

  public void test(TestHarness harness)
  {
    try 
      {
  RuleBasedCollator collator = new RuleBasedCollator("<a,A<AB,ab<ABC,abc");
  CollationElementIterator iter;
  
  iter = collator.getCollationElementIterator("abaaABC");
  iter.setOffset(1);
  harness.check(iter.getOffset(), 0);


  iter.setOffset(0);
  iter.next();
  harness.check(iter.getOffset(), 2); 
  iter.next();
  harness.check(iter.getOffset(), 3); 
  iter.next();
  harness.check(iter.getOffset(), 4); 
  iter.next();
  harness.check(iter.getOffset(), 7); 
      }
    catch (ParseException e)
      {
  harness.fail("Unexpected parse error exception");
  harness.debug(e);

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Examples of java.text.CollationElementIterator

    }


    Boolean result;


    // get the collation integer representing "_"
    CollationElementIterator cei =
                  collator.getCollationElementIterator("_");
    anyCharInts[0] = cei.next();
    {
      int nextInt;


      // There may be multiple ints representing this character
      while ((nextInt = cei.next()) != CollationElementIterator.NULLORDER)
      {
        int[] temp = new int[anyCharInts.length + 1];
        for (int index = 0; index < anyCharInts.length; index++)
        {
          temp[index] = anyCharInts[index];
        }
        temp[anyCharInts.length] = nextInt;
        anyCharInts = temp;
      }
    }
    // get the collation integer representing "%"
    cei = collator.getCollationElementIterator("%");
    anyStringInts[0] = cei.next();
    {
      int nextInt;


      // There may be multiple ints representing this character
      while ((nextInt = cei.next()) != CollationElementIterator.NULLORDER)
      {
        int[] temp = new int[anyStringInts.length + 1];
        for (int index = 0; index < anyStringInts.length; index++)
        {
          temp[index] = anyStringInts[index];

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Examples of java.text.CollationElementIterator

    }


    intArray = new int[getLength()];


    RuleBasedCollator rbc = getLocaleFinder().getCollator();
    CollationElementIterator cei = rbc.getCollationElementIterator(getString());
    int nextInt;
    while ((nextInt = cei.next()) != CollationElementIterator.NULLORDER)
    {
      /* Believe it or not, a String might have more
       * collation elements than characters.
       * So, we handle that case by increasing the int array
       * by 5 and copying array elements.

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Examples of java.text.CollationElementIterator

    }


    Boolean result;


    // get the collation integer representing "_"
    CollationElementIterator cei =
                  collator.getCollationElementIterator("_");
    anyCharInts[0] = cei.next();
    {
      int nextInt;


      // There may be multiple ints representing this character
      while ((nextInt = cei.next()) != CollationElementIterator.NULLORDER)
      {
        int[] temp = new int[anyCharInts.length + 1];
        for (int index = 0; index < anyCharInts.length; index++)
        {
          temp[index] = anyCharInts[index];
        }
        temp[anyCharInts.length] = nextInt;
        anyCharInts = temp;
      }
    }
    // get the collation integer representing "%"
    cei = collator.getCollationElementIterator("%");
    anyStringInts[0] = cei.next();
    {
      int nextInt;


      // There may be multiple ints representing this character
      while ((nextInt = cei.next()) != CollationElementIterator.NULLORDER)
      {
        int[] temp = new int[anyStringInts.length + 1];
        for (int index = 0; index < anyStringInts.length; index++)
        {
          temp[index] = anyStringInts[index];

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Examples of java.text.CollationElementIterator

     * @param s2 the contained string
     * @return true iff s1 contains s2
     */


    public boolean contains(String s1, String s2) {
        CollationElementIterator iter1 = collator.getCollationElementIterator(s1);
        CollationElementIterator iter2 = collator.getCollationElementIterator(s2);
        return collationContains(iter1, iter2, null, false);
    }

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Examples of java.text.CollationElementIterator

     * @param s2 the contained string
     * @return true iff s1 ends with s2
     */


    public boolean endsWith(String s1, String s2) {
        CollationElementIterator iter1 = collator.getCollationElementIterator(s1);
        CollationElementIterator iter2 = collator.getCollationElementIterator(s2);
        return collationContains(iter1, iter2, null, true);
    }

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Examples of java.text.CollationElementIterator

     * @param s2 the contained string
     * @return true iff s1 starts with s2
     */


    public boolean startsWith(String s1, String s2) {
        CollationElementIterator iter1 = collator.getCollationElementIterator(s1);
        CollationElementIterator iter2 = collator.getCollationElementIterator(s2);
        return collationStartsWith(iter1, iter2);
    }

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