Examples of java.text.Collator

java.text.Collator
are two strings in the default locale Collator myCollator = Collator.getInstance(); if( myCollator.compare("abc", "ABC") < 0 ) System.out.println("abc is less than ABC"); else System.out.println("abc is greater than or equal to ABC");
You can set a Collator's strength property to determine the level of difference considered significant in comparisons. Four strengths are provided: PRIMARY, SECONDARY, TERTIARY, and IDENTICAL. The exact assignment of strengths to language features is locale dependant. For example, in Czech, "e" and "f" are considered primary differences, while "e" and "ě" are secondary differences, "e" and "E" are tertiary differences and "e" and "e" are identical. The following shows how both case and accents could be ignored for US English.
```
 //Get the Collator for US English and set its strength to PRIMARY Collator usCollator = Collator.getInstance(Locale.US); usCollator.setStrength(Collator.PRIMARY); if( usCollator.compare("abc", "ABC") == 0 ) { System.out.println("Strings are equivalent"); } 
```
For comparing Strings exactly once, the compare method provides the best performance. When sorting a list of Strings however, it is generally necessary to compare each String multiple times. In this case, CollationKeys provide better performance. The CollationKey class converts a String to a series of bits that can be compared bitwise against other CollationKeys. A CollationKey is created by a Collator object for a given String.
Note: CollationKeys from different Collators can not be compared. See the class description for {@link CollationKey}for an example using CollationKeys. @see RuleBasedCollator @see CollationKey @see CollationElementIterator @see Locale @version 1.46, 07/23/06 @author Helena Shih, Laura Werner, Richard Gillam

   */
  public int compare(WikiPage a, WikiPage b) {
    // Be aware of locale when ordering
    I18nManager mgr = I18nManager.getInstance();
    Locale userLocale = mgr.getCurrentThreadLocale();
    Collator collator = Collator.getInstance(userLocale);
    collator.setStrength(Collator.PRIMARY);


    // Undefinied order if page a or b is null
    int order = 0;
    if (a != null && b != null) {
      final String nameA = a.getPageName();
      final String nameB = b.getPageName();
      // Compare page names with the localized comparator
      order = collator.compare(nameA, nameB);
    }
    return order;
  }

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      detailView.contextPut("courseNodeCss", CourseNodeFactory.getInstance().getCourseNodeConfiguration(courseNode.getType()).getIconCSSClass());


      // push infos about users groups
      List<BusinessGroup> participantGroups = course.getCourseEnvironment().getCourseGroupManager().getParticipatingLearningGroupsFromAllContexts(
          assessedIdentity);
      final Collator collator = Collator.getInstance(ureq.getLocale());
      Collections.sort(participantGroups, new Comparator<BusinessGroup>() {
        public int compare(BusinessGroup a, BusinessGroup b) {
          return collator.compare(a.getName(), b.getName());
        }
      });
      detailView.contextPut("participantGroups", participantGroups);
      detailView.contextPut("noParticipantGroups", (participantGroups.size() > 0 ? Boolean.FALSE : Boolean.TRUE));

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    private void sortTable(Table t) {


        TableItem[] items = t.getItems();
        Collator collator = Collator.getInstance(Locale.getDefault());


        int index = 0;
        for (int i = 1; i < items.length; i++) {
            String value1 = items[i].getText(index);
            for (int j = 0; j < i; j++) {
                String value2 = items[j].getText(index);
                if (collator.compare(value1, value2) < 0) {
                    String[] values = { items[i].getText(0), items[i].getText(1) };
                    items[i].dispose();
                    TableItem item = new TableItem(t, SWT.NONE, j);
                    item.setText(values);
                    items = t.getItems();

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    int comparison = 0;  // Will be -1, 0 or 1 depending on whether sLo is <, = or > than sHi 
    
    // Strings are handled separately because we have to compare them in given locale.
    if (valueLo instanceof String && valueHi instanceof String) {
      Collator collator = Collator.getInstance(); // TODO: Must be locale-specific
      comparison = collator.compare((String)valueLo, (String)valueHi);
    }
    else if (valueLo instanceof Comparable && valueHi instanceof Comparable){     
      if (loExtendsHi)
        comparison = ((Comparable)valueLo).compareTo(valueHi);
      else

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    // Neither Java 1.4.2 nor 1.5.0 has Farsi Locale collation available in
    // RuleBasedCollator. However, the Arabic Locale seems to order the
    // Farsi
    // characters properly.
    Collator c = Collator.getInstance(new Locale("ar"));
    qp.setRangeCollator(c);


    // Unicode order would include U+0633 in [ U+062F - U+0698 ], but Farsi
    // orders the U+0698 character before the U+0633 character, so the
    // single

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    if (node instanceof ParametricRangeQueryNode) {
      ParametricRangeQueryNode parametricRangeNode = (ParametricRangeQueryNode) node;
      ParametricQueryNode upper = parametricRangeNode.getUpperBound();
      ParametricQueryNode lower = parametricRangeNode.getLowerBound();
      Locale locale = Locale.getDefault();
      Collator collator = null;
      DateTools.Resolution dateRes = null;
      boolean inclusive = false;


      if (getQueryConfigHandler().hasAttribute(RangeCollatorAttribute.class)) {

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        new WhitespaceAnalyzer());


    // Neither Java 1.4.2 nor 1.5.0 has Farsi Locale collation available in
    // RuleBasedCollator. However, the Arabic Locale seems to order the Farsi
    // characters properly.
    Collator c = Collator.getInstance(new Locale("ar"));
    qp.setRangeCollator(c);


    // Unicode order would include U+0633 in [ U+062F - U+0698 ], but Farsi
    // orders the U+0698 character before the U+0633 character, so the single
    // index Term below should NOT be returned by a ConstantScoreRangeQuery

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        }


    }
    public int compare( String content, String facetValue ){
        Locale    loc       = Locale.getDefault();
        Collator  collator  = Collator.getInstance( loc );
        return collator.compare( content, facetValue );
    }

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        return null;
    }


    public int compare( String content, String facetValue ){
        Locale    loc       = Locale.getDefault();
        Collator  collator  = Collator.getInstance( loc );
        return collator.compare( content, facetValue );
    }

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    QueryParser qp = new QueryParser(Version.LUCENE_CURRENT, "content", new WhitespaceAnalyzer());


    // Neither Java 1.4.2 nor 1.5.0 has Farsi Locale collation available in
    // RuleBasedCollator.  However, the Arabic Locale seems to order the Farsi
    // characters properly.
    Collator c = Collator.getInstance(new Locale("ar"));
    qp.setRangeCollator(c);


    // Unicode order would include U+0633 in [ U+062F - U+0698 ], but Farsi
    // orders the U+0698 character before the U+0633 character, so the single
    // index Term below should NOT be returned by a ConstantScoreRangeQuery

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