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

            Locale locale = new Locale("es", "", "TRADITIONAL");
            RuleBasedCollator coll = (RuleBasedCollator) Collator
                    .getInstance(locale);
            String text = "cha";
            StringCharacterIterator source = new StringCharacterIterator(text);
            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 != text.length()) {
                iterator.next();
                offset = iterator.getOffset();
                // System.out.println(offset);
                assertEquals(e_offset[i++], offset);
            }
        }


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

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Examples of java.text.CollationElementIterator

     * @param s2 the contained string
     * @return true iff s1 contains s2
     */


    public boolean contains(String s1, String s2) {
        CollationElementIterator iter1 = collator.getCollationElementIterator(s1);
        CollationElementIterator iter2 = collator.getCollationElementIterator(s2);
        return collationContains(iter1, iter2, null, false);
    }

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Examples of java.text.CollationElementIterator

     * @param s2 the contained string
     * @return true iff s1 ends with s2
     */


    public boolean endsWith(String s1, String s2) {
        CollationElementIterator iter1 = collator.getCollationElementIterator(s1);
        CollationElementIterator iter2 = collator.getCollationElementIterator(s2);
        return collationContains(iter1, iter2, null, true);
    }

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Examples of java.text.CollationElementIterator

     * @param s2 the contained string
     * @return true iff s1 starts with s2
     */


    public boolean startsWith(String s1, String s2) {
        CollationElementIterator iter1 = collator.getCollationElementIterator(s1);
        CollationElementIterator iter2 = collator.getCollationElementIterator(s2);
        return collationStartsWith(iter1, iter2);
    }

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Examples of java.text.CollationElementIterator

     * @param s2 the contained string
     * @return the part of s1 that follows the first occurrence of s2
     */


    public String substringAfter(String s1, String s2) {
        CollationElementIterator iter1 = collator.getCollationElementIterator(s1);
        CollationElementIterator iter2 = collator.getCollationElementIterator(s2);
        int[] ia = new int[2];
        boolean ba = collationContains(iter1, iter2, ia, false);
        if (ba) {
            return s1.substring(ia[1]);
        } else {

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Examples of java.text.CollationElementIterator

     * @param s2 the contained string
     * @return the part of s1 that precedes the first occurrence of s2
     */


    public String substringBefore(String s1, String s2) {
        CollationElementIterator iter1 = collator.getCollationElementIterator(s1);
        CollationElementIterator iter2 = collator.getCollationElementIterator(s2);
        int[] ib = new int[2];
        boolean bb = collationContains(iter1, iter2, ib, false);
        if (bb) {
            return s1.substring(0, ib[0]);
        } else {

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Examples of java.text.CollationElementIterator

    public static void main(String[] args) {
        Configuration config = new Configuration();
        StringCollator collator = StandardCollationURIResolver.getInstance().resolve(args[0], args[0], config);
        FastStringBuffer sb = new FastStringBuffer(100);
        if (collator instanceof RuleBasedCollator) {
            CollationElementIterator iter = ((RuleBasedCollator)collator).getCollationElementIterator(args[1]);
            while (true) {
                int e = iter.next();
                if (e==-1) {
                    break;
                }
                sb.append(e+" ");
            }

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Examples of java.text.CollationElementIterator

    public final static boolean startsWith(Collator collator, String s1, String s2) {
        if (collator == null)
            {return s1.startsWith(s2);}
        else {
            final RuleBasedCollator rbc = (RuleBasedCollator) collator;
            final CollationElementIterator i1 = rbc.getCollationElementIterator(s1);
            final CollationElementIterator i2 = rbc.getCollationElementIterator(s2);
            return collationStartsWith(i1, i2);
        }
    }

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Examples of java.text.CollationElementIterator

    public final static boolean endsWith(Collator collator, String s1, String s2) {
        if (collator == null)
            {return s1.endsWith(s2);}
        else {
            final RuleBasedCollator rbc = (RuleBasedCollator) collator;
            final CollationElementIterator i1 = rbc.getCollationElementIterator(s1);
            final CollationElementIterator i2 = rbc.getCollationElementIterator(s2);
            return collationContains(i1, i2, null, true);
        }
    }

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Examples of java.text.CollationElementIterator

    public final static boolean contains(Collator collator, String s1, String s2) {
        if (collator == null)
            {return s1.indexOf(s2) != Constants.STRING_NOT_FOUND;}
        else {
            final RuleBasedCollator rbc = (RuleBasedCollator) collator;
            final CollationElementIterator i1 = rbc.getCollationElementIterator(s1);
            final CollationElementIterator i2 = rbc.getCollationElementIterator(s2);
            return collationContains(i1, i2, null, false);
        }
    }

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