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

    IndexReader reader = writer.getReader();
    writer.close();


    IndexSearcher search = newSearcher(reader);


    Collator c = Collator.getInstance(new Locale("da", "dk"));


    // Unicode order would not include "H\u00C5T" in [ "H\u00D8T", "MAND" ],
    // but Danish collation does.
    ScoreDoc[] result = search.search
      (csrq("content", "H\u00D8T", "MAND", F, F, c), null, 1000).scoreDocs;

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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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            {
                // For now, create and configure a collator instance. I can't
                // actually imagine that this'd be slower than caching them
                // a la ClassCache, so we aren't trying to outsmart ourselves
                // with a caching mechanism for now.
                Collator collator = Collator.getInstance(cx.getLocale());
                collator.setStrength(Collator.IDENTICAL);
                collator.setDecomposition(Collator.CANONICAL_DECOMPOSITION);
                return ScriptRuntime.wrapNumber(collator.compare(
                        ScriptRuntime.toString(thisObj), 
                        ScriptRuntime.toString(args, 0)));
            }
            case Id_toLocaleLowerCase:
            {

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            assertEquals(i, coll.getDecomposition());
        }
    }


    public void testCollator_GetInstance() {
        Collator coll = Collator.getInstance();
        Object obj1 = "a";
        Object obj2 = "b";
        assertEquals(-1, coll.compare(obj1, obj2));


        Collator.getInstance();
        assertFalse(coll.equals("A", "\uFF21"));
    }

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        // }
    }


    // Test CollationKey
    public void testCollationKey() {
        Collator coll = Collator.getInstance(Locale.US);
        String text = "abc";
        CollationKey key = coll.getCollationKey(text);
        key.hashCode();


        CollationKey key2 = coll.getCollationKey("abc");


        assertEquals(0, key.compareTo(key2));
    }

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        // Regression for Harmony-1066
        assertTrue(head instanceof Serializable);


        // Regression for ill-behaved collator
        Collator c = new Collator() {
            @Override
            public int compare(String o1, String o2) {
                if (o1 == null) {
                    return 0;
                }

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    * for one character strings.
    */
    public void _compareSubstring() {
        boolean result = true ;
        char[] chars = new char[2] ;
        Collator col = null ;


        log.println(" #### Testing English locale ####") ;
        oObj.loadDefaultCollator(loc, 0) ;
        col = Collator.getInstance(new java.util.Locale("en", "EN")) ;
        for (char ch = 0x0020; ch < 0x007F; ch ++) {

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    * for one character strings.
    */
    public void _compareString() {
        boolean result = true ;
        char[] chars = new char[2] ;
        Collator col = null ;
        log.println(" #### Testing English locale ####") ;
        oObj.loadDefaultCollator(
            new com.sun.star.lang.Locale("en", "EN", ""), 0) ;
        col = Collator.getInstance(new java.util.Locale("en", "EN")) ;
        for (char ch = 0x0020; ch < 0x007F; ch ++) {

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     *
     * @param name the language name
     * @return the collator
     */
    public static Collator getCollator(String name) {
        Collator result = null;
        if (name.startsWith(ICU4J)) {
            name = name.substring(ICU4J.length());
        } else if (name.startsWith(DEFAULT)) {
            name = name.substring(DEFAULT.length());
        }

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        String name = readAliasIdentifier();
        command.setString(name);
        if (equalsToken(name, CompareMode.OFF)) {
            return command;
        }
        Collator coll = CompareMode.getCollator(name);
        if (coll == null) {
            throw DbException.getInvalidValueException("collation", name);
        }
        if (readIf("STRENGTH")) {
            if (readIf("PRIMARY")) {
                command.setInt(Collator.PRIMARY);
            } else if (readIf("SECONDARY")) {
                command.setInt(Collator.SECONDARY);
            } else if (readIf("TERTIARY")) {
                command.setInt(Collator.TERTIARY);
            } else if (readIf("IDENTICAL")) {
                command.setInt(Collator.IDENTICAL);
            }
        } else {
            command.setInt(coll.getStrength());
        }
        return command;
    }

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