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 void testFarsi() throws Exception {
    // 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 collator = Collator.getInstance(new Locale("ar"));
    Query query = new TermRangeQuery("content", "\u062F", "\u0698", true, true, collator);
    // 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 TermRangeQuery with a Farsi
    // Collator (or an Arabic one for the case when Farsi is not supported).

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    assertEquals("The index Term should be included.", 1, hits.length);
    searcher.close();
  }
  
  public void testDanish() throws Exception {
    Collator collator = Collator.getInstance(new Locale("da", "dk"));
    // Danish collation orders the words below in the given order (example taken
    // from TestSort.testInternationalSort() ).
    String[] words = { "H\u00D8T", "H\u00C5T", "MAND" };
    Query query = new TermRangeQuery("content", "H\u00D8T", "MAND", false, false, collator);

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    // Copied from beforeClass, but scaled down to few docs:
    // since otherwise this test can run for a very long
    // time (1-2 hours or more; see Lucene-Solr-4.x-Linux Build #2204):
    final Locale locale = LuceneTestCase.randomLocale(random());
    Collator collator = Collator.getInstance(locale);
    collator.setStrength(Collator.IDENTICAL);
    collator.setDecomposition(Collator.NO_DECOMPOSITION);


    int numDocs = 20 * RANDOM_MULTIPLIER;
    Directory dir = newDirectory();
    RandomIndexWriter iw = new RandomIndexWriter(random(), dir);
    for (int i = 0; i < numDocs; i++) {

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  }




  Comparator comparatorStringLocale(final String fieldName,
      Locale locale) {
    final Collator collator = Collator.getInstance(locale);
    return new ShardComparator(fieldName) {
      @Override
      public final int compare(final Object o1, final Object o2) {
        ShardDoc sd1 = (ShardDoc) o1;
        ShardDoc sd2 = (ShardDoc) o2;
        Comparable v1 = (Comparable)sortVal(sd1);
        Comparable v2 = (Comparable)sortVal(sd2);
        if (v1==v2)
          return 0;
        if (v1==null)
          return 1;
        if(v2==null)
          return -1;
        return -collator.compare(v1,v2);
      }
    };
  }

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    private String patternText;


    @Override
    protected Comparator<Object> getItemsComparator() {
        if (fComparator == null) {
            final Collator collator = Collator.getInstance();
            if (collator instanceof RuleBasedCollator) {
                final RuleBasedCollator rbc = (RuleBasedCollator) collator;
                final String rules = rbc.getRules();
                final String newRules = rules.replaceFirst("<\'.\'<", "<").replaceFirst(
                        "<\'_\'<", "<\'.\'<\'_\'<");

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  public class JSONObjectComparable extends JSONObject implements Comparator<JSONObject>{
     
    public int compare(JSONObject o1, JSONObject o2) {
      try{
        Collator collator = Collator.getInstance();
        String thisName = o1.getString("name");
        String compareName = o2.getString("name");
        if(!thisName.equals(compareName)){
          int retval = collator.compare(thisName, compareName);
          return retval;
        }else{
          String thisAuthorEmail = o1.getString("authorEmail");
          String compareAuthorEmail = o2.getString("authorEmail");
          int retval = collator.compare(thisAuthorEmail, compareAuthorEmail);
          return retval;
        }
      } catch (JSONException e) {
      }
    return 0;

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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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  public void testFarsi() throws Exception {
    // 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 collator = Collator.getInstance(new Locale("ar"));
    Query query = new TermRangeQuery("content", "\u062F", "\u0698", true, true, collator);
    // 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 TermRangeQuery with a Farsi
    // Collator (or an Arabic one for the case when Farsi is not supported).

View Full Code Here

    assertEquals("The index Term should be included.", 1, hits.length);
    searcher.close();
  }
  
  public void testDanish() throws Exception {
    Collator collator = Collator.getInstance(new Locale("da", "dk"));
    // Danish collation orders the words below in the given order (example taken
    // from TestSort.testInternationalSort() ).
    String[] words = { "H\u00D8T", "H\u00C5T", "MAND" };
    Query query = new TermRangeQuery("content", "H\u00D8T", "MAND", false, false, collator);

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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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