Examples of com.ibm.icu.text.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

        {
            int element;
            StringBuffer buf = new StringBuffer();


            // Iterate throught the elements of the collator
            CollationElementIterator iter = collator.getCollationElementIterator(str);
            
            while ((element = iter.next()) != CollationElementIterator.NULLORDER)
            {
                // Generate a hexadecimal string representaion of the Collation element
                // This can then be compared in a text sort ;-)
                String test = Integer.toString(element, 16);
                buf.append(test);

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    {
        String rule[] = {"&h<H&CH=\u0427",
                         "&CH=\u0427&h<H",
                         "&CH=\u0427"}; 
        RuleBasedCollator rbc = null;
        CollationElementIterator iter1;
        CollationElementIterator iter2;
        for (int i = 0; i < rule.length; i ++) {
            try {
                rbc = new RuleBasedCollator(rule[i]); 
            } catch (Exception e) {
                warnln(e.getMessage());
                return;
            }
            iter1 = rbc.getCollationElementIterator("CH"); 
            iter2 = rbc.getCollationElementIterator("\u0427");
            int ce1 = CollationElementIterator.IGNORABLE;
            int ce2 = CollationElementIterator.IGNORABLE;
            while (ce1 != CollationElementIterator.NULLORDER
                   && ce2 != CollationElementIterator.NULLORDER) {
                ce1 = iter1.next();
                ce2 = iter2.next();
                if (ce1 != ce2) {
                    errln("Error generating RuleBasedCollator with the rule "
                          + rule[i]);
                    errln("CH != \\u0427");
                }

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            "&a << B / \ud800\udc00m",
        };
    
        RuleBasedCollator  coll = null;
        for (int i = 0; i < testrules.length; i ++) {
            CollationElementIterator iter1 = null;
            int j = 0;
            // logln("Rule " + testrules[i] + " for testing\n");
            String rule = testrules[i];
            try {
                coll = new RuleBasedCollator(rule);
            } catch (Exception e) {
                warnln("Collator creation failed " + testrules[i]);
                return;
            }
            try {
                iter1 = coll.getCollationElementIterator(testdata[i]);
            } catch (Exception e) {
                errln("Collation iterator creation failed\n");
                return;
            }
            while (j < 2) {
                CollationElementIterator iter2;
                int ce;
                try {
                    iter2 = coll.getCollationElementIterator(String.valueOf(testdata[i].charAt(j)));
                
                }catch (Exception e) {
                    errln("Collation iterator creation failed\n");
                    return;
                }
                ce = iter2.next();
                while (ce != CollationElementIterator.NULLORDER) {
                    if (iter1.next() != ce) {
                        errln("Collation elements in contraction split does not match\n");
                        return;
                    }
                    ce = iter2.next();
                }
                j ++;
            }
            if (iter1.next() != CollationElementIterator.NULLORDER) {
                errln("Collation elements not exhausted\n");
                return;
            }
        }
        String rule = "& a < b < c < ch < d & c = ch / h";
        try {
            coll = new RuleBasedCollator(rule);
        } catch (Exception e) {
            errln("cannot create rulebased collator");
            return;
        }
        
        if (coll.compare(testdata2[0], testdata2[1]) != -1) {
            errln("Expected " + testdata2[0] + " < " + testdata2[1]);
            return;
        }
        if (coll.compare(testdata2[1], testdata2[2]) != -1) {
            errln("Expected " + testdata2[1] + " < " + testdata2[2]);
            return;
        }
        for (int i = 0; i < testrules3.length; i += 2) {
            RuleBasedCollator          coll1, coll2;
            CollationElementIterator iter1, iter2;
            char               ch = 0x0042;
            int            ce;
            rule = testrules3[i];
            try {
                coll1 = new RuleBasedCollator(rule);
            } catch (Exception e) {
                errln("Fail: cannot create rulebased collator, rule:" + rule);
                return;
            }
            rule = testrules3[i + 1];
            try {
                coll2 = new RuleBasedCollator(rule);
            } catch (Exception e) {
                errln("Collator creation failed " + testrules[i]);
                return;
            }
            try {
                iter1 = coll1.getCollationElementIterator(String.valueOf(ch));
                iter2 = coll2.getCollationElementIterator(String.valueOf(ch));
            } catch (Exception e) {
                errln("Collation iterator creation failed\n");
                return;
            }
            ce = iter1.next();
            
            while (ce != CollationElementIterator.NULLORDER) {
                if (ce != iter2.next()) {
                    errln("CEs does not match\n");
                    return;
                }
                ce = iter1.next();
            }
            if (iter2.next() != CollationElementIterator.NULLORDER) {
                errln("CEs not exhausted\n");
                return;
            }

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                            && (key2.toByteArray())[0] > 1) {
                            errln("Primary sort order should be 0");
                        }
                    }
                } catch (Exception e) {
                    CollationElementIterator iter 
                        = coll.getCollationElementIterator(tokens[i]);
                    /*int ce =*/ iter.next();
                    int ce2 = iter.next();
                    if (ce2 == CollationElementIterator.NULLORDER) {
                        errln("Token " + tokens[i] + " not expected to fail");
                    }
                    if (coll.getVariableTop() != varTopOriginal) {
                        errln("When exception is thrown variable top should "

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        }
        else {
            doTestVariant(test, col, target, source, 0);
        }


        CollationElementIterator iter = col.getCollationElementIterator(source);
        backAndForth(test, iter);
        iter.setText(target);
        backAndForth(test, iter);
    }

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        {
            int element;
            StringBuffer buf = new StringBuffer();


            // Iterate through the elements of the collator
            CollationElementIterator iter = collator.getCollationElementIterator(str);
            
            while ((element = iter.next()) != CollationElementIterator.NULLORDER)
            {
                // Generate a hexadecimal string representation of the Collation element
                // This can then be compared in a text sort ;-)
                String test = Integer.toString(element, 16);
                buf.append(test);

View Full Code Here

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