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

    }
  }


  public void testNext() {
    String text = "abc";
    CollationElementIterator iterator = coll
        .getCollationElementIterator(text);
    int[] orders = new int[text.length()];
    int order = iterator.next();
    int i = 0;
    while (order != CollationElementIterator.NULLORDER) {
      orders[i++] = order;
      order = iterator.next();
    }


    int offset = iterator.getOffset();
    assertEquals(text.length(), offset);
    order = iterator.previous();


    while (order != CollationElementIterator.NULLORDER) {
      assertEquals(orders[--i], order);
      order = iterator.previous();
    }


    assertEquals(0, iterator.getOffset());
  }

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Examples of java.text.CollationElementIterator

    assertEquals(0, iterator.getOffset());
  }


  public void testReset() {
    String text = "abc";
    CollationElementIterator iterator = coll
        .getCollationElementIterator(text);
    int[] orders = new int[text.length()];
    int order = iterator.next();
    int i = 0;
    while (order != CollationElementIterator.NULLORDER) {
      orders[i++] = order;
      order = iterator.next();
    }


    int offset = iterator.getOffset();
    assertEquals(text.length(), offset);


    iterator.reset();
    assertEquals(0, iterator.getOffset());
  }

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Examples of java.text.CollationElementIterator


  public void testGetMaxExpansion() {
    String text = "cha";
    RuleBasedCollator rbColl = (RuleBasedCollator) Collator
        .getInstance(new Locale("es", "", "TRADITIONAL"));
    CollationElementIterator iterator = rbColl
        .getCollationElementIterator(text);
    int order = iterator.next();
    while (order != CollationElementIterator.NULLORDER) {
      assertEquals(1, iterator.getMaxExpansion(order));
      order = iterator.next();
    }


  }

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Examples of java.text.CollationElementIterator


  public void testPrimaryOrder() {
    RuleBasedCollator rbColl = (RuleBasedCollator) Collator
        .getInstance(new Locale("de", "DE"));
    String text = "\u00e6";
    CollationElementIterator iterator = rbColl
        .getCollationElementIterator(text);
    int order = iterator.next();
    int pOrder = CollationElementIterator.primaryOrder(order);
    CollationElementIterator iterator2 = rbColl
        .getCollationElementIterator("ae");
    int order2 = iterator2.next();
    int pOrder2 = CollationElementIterator.primaryOrder(order2);
    assertEquals(pOrder, pOrder2);
  }

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Examples of java.text.CollationElementIterator


  public void testSecondaryOrder() {
    RuleBasedCollator rbColl = (RuleBasedCollator) Collator
        .getInstance(new Locale("fr", "FR"));
    String text = "a\u00e0";
    CollationElementIterator iterator = rbColl
        .getCollationElementIterator(text);
    int order = iterator.next();
    int sOrder1 = CollationElementIterator.secondaryOrder(order);


    order = iterator.next();
    int sOrder2 = CollationElementIterator.secondaryOrder(order);


    assertEquals(sOrder1, sOrder2);
  }

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Examples of java.text.CollationElementIterator


  public void testTertiaryOrder() {
    RuleBasedCollator rbColl = (RuleBasedCollator) Collator
        .getInstance(new Locale("fr", "FR"));
    String text = "abAB";
    CollationElementIterator iterator = rbColl
        .getCollationElementIterator(text);
    int order = iterator.next();
    int tOrder1 = CollationElementIterator.tertiaryOrder(order);
    order = iterator.next();
    int tOrder2 = CollationElementIterator.tertiaryOrder(order);
    assertEquals(tOrder1, tOrder2);


    order = iterator.next();
    tOrder1 = CollationElementIterator.tertiaryOrder(order);
    order = iterator.next();
    tOrder2 = CollationElementIterator.tertiaryOrder(order);
    assertEquals(tOrder1, tOrder2);
  }

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Examples of java.text.CollationElementIterator


  public void testSetOffset() {
    RuleBasedCollator rbColl = (RuleBasedCollator) Collator
        .getInstance(new Locale("es", "", "TRADITIONAL"));
    String text = "cha";
    CollationElementIterator iterator = rbColl
        .getCollationElementIterator(text);
    iterator.setOffset(1);
    assertEquals(0, iterator.getOffset());
  }

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Examples of java.text.CollationElementIterator

   */
  public void testSetTextString() {
    RuleBasedCollator rbColl = (RuleBasedCollator) Collator
        .getInstance(new Locale("es", "", "TRADITIONAL"));
    String text = "caa";
    CollationElementIterator iterator = rbColl
        .getCollationElementIterator(text);
    iterator.setOffset(1);
    assertEquals(1, iterator.getOffset());
    iterator.setText("cha");
    iterator.setOffset(1);
    assertEquals(0, iterator.getOffset());
  }

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Examples of java.text.CollationElementIterator

   */
  public void testSetTextCharacterIterator() {
    RuleBasedCollator rbColl = (RuleBasedCollator) Collator
        .getInstance(new Locale("es", "", "TRADITIONAL"));
    String text = "caa";
    CollationElementIterator iterator = rbColl
        .getCollationElementIterator(text);
    iterator.setOffset(1);
    assertEquals(1, iterator.getOffset());
    iterator.setText(new StringCharacterIterator("cha"));
    iterator.setOffset(1);
    assertEquals(0, iterator.getOffset());
  }

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Examples of java.text.CollationElementIterator

        {
            Locale locale = new Locale("es", "", "TRADITIONAL");
            RuleBasedCollator coll = (RuleBasedCollator) Collator
                    .getInstance(locale);
            String source = "cha";
            CollationElementIterator iterator = coll
                    .getCollationElementIterator(source);
            int[] e_offset = { 0, 2, 3 };
            int offset = iterator.getOffset();
            int i = 0;
            assertEquals(e_offset[i++], offset);
            while (offset != source.length()) {
                iterator.next();
                offset = iterator.getOffset();
                assertEquals(e_offset[i++], offset);
            }
        }


        {
            Locale locale = new Locale("de", "DE");
            RuleBasedCollator coll = (RuleBasedCollator) Collator
                    .getInstance(locale);
            String source = "\u00E6b";
            CollationElementIterator iterator = coll
                    .getCollationElementIterator(source);
            int[] e_offset = { 0, 1, 1, 2 };
            int offset = iterator.getOffset();
            int i = 0;
            assertEquals(e_offset[i++], offset);
            while (offset != source.length()) {
                iterator.next();
                offset = iterator.getOffset();
                assertEquals(e_offset[i++], offset);
            }
        }
        //Regression for HARMONY-1352
        try {

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