tschleicher
Topic posted 2009/12/10, 12:26 UTC+1

FastObjects j2 (10.0.8.184)
Hello,

the default sort order for string objects on indexes is ISO 14651. I know FastObject j2 supports also UNICODE sorting.
How can I switch the lexical order? I don't find anything in my manual or google for FOj2.

Example for default ISO 14651 sorting:

[classes\com.bla.Entry]
useIndexes = Index_For_Name
persistent = true

[indexes\Index_For_Name]
members = name
class = com.bla.Entry

Best regards

  private static final RuleBasedCollator instance = (RuleBasedCollator)RuleBasedCollator.getInstance(); // use default language, because versant string index use it, too



  static {

    instance.setStrength(Collator.PRIMARY);

  }



  private static boolean startsWith(String oneString, String twoString) {

    final ISO14651CollationIterator oneStringIterator = new ISO14651CollationIterator(instance.getCollationElementIterator(oneString));

    final ISO14651CollationIterator twoStringIterator = new ISO14651CollationIterator(instance.getCollationElementIterator(twoString));



    while (oneStringIterator.hasNext() && twoStringIterator.hasNext())

      if (oneStringIterator.next() != twoStringIterator.next())

        return false;



    return true;

  }



  private static final class ISO14651CollationIterator { // do not implement 'Iterator', cause next result 'int' not 'Integer'

    private final CollationElementIterator iterator;



    private int next;

    private boolean noNext;



    private ISO14651CollationIterator(CollationElementIterator iterator) {

      this.iterator = iterator;

    }



    private int next() {

      if (!hasNext())

        throw new NoSuchElementException();



      final int next = this.next;

      this.next = 0;

      return next;

    }



    private boolean hasNext() {

      if (noNext)

        return false;



      while (next == 0) {

        final int magicKey = iterator.next();

        if (magicKey == CollationElementIterator.NULLORDER) {

          noNext = true;

          return false;

        }

        next = CollationElementIterator.primaryOrder(magicKey);

      }

      return true;

    }

  }