Examples of RuleBasedCollator

com.ibm.icu.text.RuleBasedCollator
nicode.org/unicode/reports/tr10/">Unicode Collation Algorithm (UCA) and conforms to ISO 14651.

Users are strongly encouraged to read the users guide for more information about the collation service before using this class.

Create a RuleBasedCollator from a locale by calling the getInstance(Locale) factory method in the base class Collator. Collator.getInstance(Locale) creates a RuleBasedCollator object based on the collation rules defined by the argument locale. If a customized collation ordering ar attributes is required, use the RuleBasedCollator(String) constructor with the appropriate rules. The customized RuleBasedCollator will base its ordering on UCA, while re-adjusting the attributes and orders of the characters in the specified rule accordingly.

RuleBasedCollator provides correct collation orders for most locales supported in ICU. If specific data for a locale is not available, the orders eventually falls back to the UCA collation order .

For information about the collation rule syntax and details about customization, please refer to the Collation customization section of the user's guide.

Note that there are some differences between the Collation rule syntax used in Java and ICU4J:
- According to the JDK documentation:
  Modifier '!' : Turns on Thai/Lao vowel-consonant swapping. If this rule is in force when a Thai vowel of the range \U0E40-\U0E44 precedes a Thai consonant of the range \U0E01-\U0E2E OR a Lao vowel of the range \U0EC0-\U0EC4 precedes a Lao consonant of the range \U0E81-\U0EAE then the vowel is placed after the consonant for collation purposes.
  
  If a rule is without the modifier '!', the Thai/Lao vowel-consonant swapping is not turned on.
  
  ICU4J's RuleBasedCollator does not support turning off the Thai/Lao vowel-consonant swapping, since the UCA clearly states that it has to be supported to ensure a correct sorting order. If a '!' is encountered, it is ignored.
- As mentioned in the documentation of the base class Collator, compatibility decomposition mode is not supported.
Examples

Creating Customized RuleBasedCollators:
```
 String simple = "& a < b < c < d"; RuleBasedCollator simpleCollator = new RuleBasedCollator(simple); String norwegian = "& a , A < b , B < c , C < d , D < e , E " + "< f , F < g , G < h , H < i , I < j , " + "J < k , K < l , L < m , M < n , N < " + "o , O < p , P < q , Q < r , R < s , S < " + "t , T < u , U < v , V < w , W < x , X " + "< y , Y < z , Z < \u00E5 = a\u030A " + ", \u00C5 = A\u030A ; aa , AA < \u00E6 " + ", \u00C6 < \u00F8 , \u00D8"; RuleBasedCollator norwegianCollator = new RuleBasedCollator(norwegian); 
```
Concatenating rules to combine Collators:
```
 // Create an en_US Collator object RuleBasedCollator en_USCollator = (RuleBasedCollator) Collator.getInstance(new Locale("en", "US", "")); // Create a da_DK Collator object RuleBasedCollator da_DKCollator = (RuleBasedCollator) Collator.getInstance(new Locale("da", "DK", "")); // Combine the two // First, get the collation rules from en_USCollator String en_USRules = en_USCollator.getRules(); // Second, get the collation rules from da_DKCollator String da_DKRules = da_DKCollator.getRules(); RuleBasedCollator newCollator = new RuleBasedCollator(en_USRules + da_DKRules); // newCollator has the combined rules 
```
Making changes to an existing RuleBasedCollator to create a new Collator object, by appending changes to the existing rule:
```
 // Create a new Collator object with additional rules String addRules = "& C < ch, cH, Ch, CH"; RuleBasedCollator myCollator = new RuleBasedCollator(en_USCollator.getRules() + addRules); // myCollator contains the new rules 
```
How to change the order of non-spacing accents:
```
 // old rule with main accents String oldRules = "= \u0301 ; \u0300 ; \u0302 ; \u0308 " + "; \u0327 ; \u0303 ; \u0304 ; \u0305 " + "; \u0306 ; \u0307 ; \u0309 ; \u030A " + "; \u030B ; \u030C ; \u030D ; \u030E " + "; \u030F ; \u0310 ; \u0311 ; \u0312 " + "< a , A ; ae, AE ; \u00e6 , \u00c6 " + "< b , B < c, C < e, E & C < d , D"; // change the order of accent characters String addOn = "& \u0300 ; \u0308 ; \u0302"; RuleBasedCollator myCollator = new RuleBasedCollator(oldRules + addOn); 
```
Putting in a new primary ordering before the default setting, e.g. sort English characters before or after Japanese characters in the Japanese Collator:
```
 // get en_US Collator rules RuleBasedCollator en_USCollator = (RuleBasedCollator)Collator.getInstance(Locale.US); // add a few Japanese characters to sort before English characters // suppose the last character before the first base letter 'a' in // the English collation rule is \u2212 String jaString = "& \u2212 < \u3041, \u3042 < \u3043, " + "\u3044"; RuleBasedCollator myJapaneseCollator = new RuleBasedCollator(en_USCollator.getRules() + jaString); 
```
This class is not subclassable
@author Syn Wee Quek @stable ICU 2.8
java.text.RuleBasedCollator
rule String oldRules = "=\u0301;\u0300;\u0302;\u0308" // main accents + ";\u0327;\u0303;\u0304;\u0305" // main accents + ";\u0306;\u0307;\u0309;\u030A" // main accents + ";\u030B;\u030C;\u030D;\u030E" // main accents + ";\u030F;\u0310;\u0311;\u0312" // main accents + "< a , A ; ae, AE ; \u00e6 , \u00c6" + "< b , B < c, C < e, E & C < d, D"; // change the order of accent characters String addOn = "& \u0300 ; \u0308 ; \u0302"; RuleBasedCollator myCollator = new RuleBasedCollator(oldRules + addOn); @see Collator @see CollationElementIterator @version 1.25 07/24/98 @author Helena Shih, Laura Werner, Richard Gillam

Examples of java.text.RuleBasedCollator


    while (lastNonspaceChar > 0 && 
         rawData[lastNonspaceChar - 1] == '\u0020')
      lastNonspaceChar--;      // count off the trailing spaces.


    RuleBasedCollator rbc = getLocaleFinder().getCollator();    
    cKey = rbc.getCollationKey(new String(rawData, 0, lastNonspaceChar));


    return cKey;
  }

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Examples of java.text.RuleBasedCollator

      }
    }


    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.

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Examples of java.text.RuleBasedCollator

public class RuleBasedCollatorTest extends TestCase {


  public void test_getCollationKeyLjava_lang_String() {
    // Regression test for HARMONY-28
    String source = null;
    RuleBasedCollator rbc = null;
    try {
      String Simple = "< a< b< c< d";
      rbc = new RuleBasedCollator(Simple);
    } catch (ParseException e) {
      fail("Assert 0: Unexpected format exception " + e);
    }
    CollationKey ck = rbc.getCollationKey(source);
    assertNull("Assert 1: getCollationKey (null) does not return null", ck);
  }

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Examples of java.text.RuleBasedCollator

  }
    
    public void testHashCode() throws ParseException {
        {
            String rule = "< a < b < c < d";
            RuleBasedCollator coll = new RuleBasedCollator(rule);
            assertEquals(rule.hashCode(), coll.hashCode());
        }


        {
            String rule = "< a < b < c < d < e";
            RuleBasedCollator coll = new RuleBasedCollator(rule);
            assertEquals(rule.hashCode(), coll.hashCode());
        }


    }

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Examples of java.text.RuleBasedCollator

        }


    }


    public void testClone() throws ParseException {
        RuleBasedCollator coll = (RuleBasedCollator) Collator
                .getInstance(Locale.US);
        RuleBasedCollator clone = (RuleBasedCollator) coll.clone();
        assertNotSame(coll, clone);
        assertEquals(coll.getRules(), clone.getRules());
        assertEquals(coll.getDecomposition(), clone.getDecomposition());
        assertEquals(coll.getStrength(), clone.getStrength());
    }

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Examples of java.text.RuleBasedCollator

    /*
     * Class under test for boolean equals(java.lang.Object)
     */
    public void testEqualsObject() throws ParseException {
        String rule = "< a < b < c < d < e";
        RuleBasedCollator coll = new RuleBasedCollator(rule);


        assertEquals(Collator.TERTIARY, coll.getStrength());
        assertEquals(Collator.NO_DECOMPOSITION, coll.getDecomposition());
        RuleBasedCollator other = new RuleBasedCollator(rule);
        assertTrue(coll.equals(other));


        coll.setStrength(Collator.PRIMARY);
        assertFalse(coll.equals(other));

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Examples of java.text.RuleBasedCollator

    /*
     * Class under test for int compare(java.lang.String, java.lang.String)
     */
    public void testCompareStringString() throws ParseException {
        String rule = "< c < b < a";
        RuleBasedCollator coll = new RuleBasedCollator(rule);
        assertEquals(-1, coll.compare("c", "a"));
    }

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Examples of java.text.RuleBasedCollator

        RuleBasedCollator coll = new RuleBasedCollator(rule);
        assertEquals(-1, coll.compare("c", "a"));
    }


    public void testGetCollationKey() {
        RuleBasedCollator coll = (RuleBasedCollator) Collator
                .getInstance(Locale.GERMAN);
        String source = "abc";
        CollationKey key1 = coll.getCollationKey(source);
        assertEquals(source, key1.getSourceString());
        String source2 = "abb";
        CollationKey key2 = coll.getCollationKey(source2);
        assertEquals(source2, key2.getSourceString());
        assertTrue(key1.compareTo(key2) > 0);
        assertTrue(coll.compare(source, source2) > 0);


    }

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Examples of java.text.RuleBasedCollator


    }


    public void testGetRules() throws ParseException {
        String rule = "< a = b < c";
        RuleBasedCollator coll = new RuleBasedCollator(rule);
        assertEquals(rule, coll.getRules());
    }

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Examples of java.text.RuleBasedCollator

     * getCollationElementIterator(java.lang.String)
     */
    public void testGetCollationElementIteratorString() throws Exception {
        {
            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 {
            new RuleBasedCollator("< a< b< c< d").getCollationElementIterator((String)null);
            fail("NullPointerException expected");
        } catch (NullPointerException e) {
            //expected
        }
    }

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