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

     * @param s2 the contained string
     * @return the part of s1 that follows the first occurrence of s2
     */


    public String substringAfter(String s1, String s2) {
        CollationElementIterator iter1 = collator.getCollationElementIterator(s1);
        CollationElementIterator iter2 = collator.getCollationElementIterator(s2);
        int[] ia = new int[2];
        boolean ba = collationContains(iter1, iter2, ia, false);
        if (ba) {
            return s1.substring(ia[1]);
        } else {

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Examples of java.text.CollationElementIterator

     * @param s2 the contained string
     * @return the part of s1 that precedes the first occurrence of s2
     */


    public String substringBefore(String s1, String s2) {
        CollationElementIterator iter1 = collator.getCollationElementIterator(s1);
        CollationElementIterator iter2 = collator.getCollationElementIterator(s2);
        int[] ib = new int[2];
        boolean bb = collationContains(iter1, iter2, ib, false);
        if (bb) {
            return s1.substring(0, ib[0]);
        } else {

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Examples of java.text.CollationElementIterator

        RuleBasedCollator collator = new RuleBasedCollator(rules);


        for (int i=0; i<args.length; i++) {
            System.err.println(args[i]);
            FastStringBuffer sb = new FastStringBuffer(FastStringBuffer.MEDIUM);
            CollationElementIterator iter = collator.getCollationElementIterator(args[i]);
            while (true) {
                int e = iter.next();
                if (e==-1) {
                    break;
                }
                sb.append(e+" ");
            }

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Examples of java.text.CollationElementIterator

                dynamicError("The collation for " + getDisplayName(context.getController().getNamePool()) +
                        " must be a RuleBaseCollator", context);
                return null;
            }
            RuleBasedCollator rbc = (RuleBasedCollator)collator;
            CollationElementIterator iter0 = rbc.getCollationElementIterator(s0);
            CollationElementIterator iter1 = rbc.getCollationElementIterator(s1);


            switch (operation) {
                case STARTSWITH:
                    return BooleanValue.get( collationStartsWith(iter0, iter1) );
                case CONTAINS:

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Examples of java.text.CollationElementIterator

    boolean hasSingleCollationElement() throws StandardException {
        if (stringData.isNull()) {
            return false;
        }


        CollationElementIterator cei =
            collatorForCharacterDatatypes.getCollationElementIterator(
                stringData.getString());


        // First call next() to see that there is at least one element, and
        // then call next() to see that there is no more than one element.
        return cei.next() != CollationElementIterator.NULLORDER &&
                cei.next() == CollationElementIterator.NULLORDER;
    }

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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

    }
        


    collationElementsForString = new int[stringData.getLength()];


    CollationElementIterator cei = 
            collatorForCharacterDatatypes.getCollationElementIterator(
                stringData.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 hasSingleCollationElement() throws StandardException {
        if (stringData.isNull()) {
            return false;
        }


        CollationElementIterator cei =
            collatorForCharacterDatatypes.getCollationElementIterator(
                stringData.getString());


        // First call next() to see that there is at least one element, and
        // then call next() to see that there is no more than one element.
        return cei.next() != CollationElementIterator.NULLORDER &&
                cei.next() == CollationElementIterator.NULLORDER;
    }

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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

    coll = (RuleBasedCollator) Collator.getInstance(Locale.US);
  }


  public void testGetOffset() {
    String text = "abc";
    CollationElementIterator iterator = coll
        .getCollationElementIterator(text);
    int[] offsets = { 0, 1, 2, 3 };
    int offset = iterator.getOffset();
    int i = 0;
    assertEquals(offsets[i++], offset);
    while (offset != text.length()) {
      iterator.next();
      offset = iterator.getOffset();
      assertEquals(offsets[i++], offset);
    }
  }

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