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

        fireTableRowsUpdated(0, getRowCount() - 1);
      }
    }


    public Comparator<CatalogPieceOfFurniture> getFurnitureComparator(final String propertyKey) {
      final Collator collator = Collator.getInstance();
      Comparator<CatalogPieceOfFurniture> furnitureComparator = null;
      if (FurnitureLibrary.FURNITURE_ID_PROPERTY.equals(propertyKey)) {
        furnitureComparator = new Comparator<CatalogPieceOfFurniture>() {
            public int compare(CatalogPieceOfFurniture piece1, CatalogPieceOfFurniture piece2) {
              if (piece1.getId() == null) {
                return -1;
              } else if (piece2.getId() == null) {
                return 1; 
              } else {
                return collator.compare(piece1.getId(), piece2.getId());
              }
            }
          };
      } else if (FurnitureLibrary.FURNITURE_NAME_PROPERTY.equals(propertyKey)) {
         furnitureComparator = new Comparator<CatalogPieceOfFurniture>() {
             public int compare(CatalogPieceOfFurniture piece1, CatalogPieceOfFurniture piece2) {
               String piece1Name = (String)furnitureLibrary.getPieceOfFurnitureLocalizedData(
                   piece1, controller.getFurnitureLangauge(), propertyKey, piece1.getName());
               String piece2Name = (String)furnitureLibrary.getPieceOfFurnitureLocalizedData(
                   piece2, controller.getFurnitureLangauge(), propertyKey, piece2.getName());
               return collator.compare(piece1Name, piece2Name);
             }
           };
      } else if (FurnitureLibrary.FURNITURE_DESCRIPTION_PROPERTY.equals(propertyKey)) {
        furnitureComparator = new Comparator<CatalogPieceOfFurniture>() {
            public int compare(CatalogPieceOfFurniture piece1, CatalogPieceOfFurniture piece2) {
              String piece1Description = (String)furnitureLibrary.getPieceOfFurnitureLocalizedData(
                  piece1, controller.getFurnitureLangauge(), propertyKey, piece1.getDescription());
              if (piece1Description == null) {
                return -1;
              } else {
                String piece2Description = (String)furnitureLibrary.getPieceOfFurnitureLocalizedData(
                    piece2, controller.getFurnitureLangauge(), propertyKey, piece2.getDescription());
                if (piece2Description == null) {
                  return 1; 
                } else {
                  return collator.compare(piece1Description, piece2Description);
                }
              }
            }
          };
      } else if (FurnitureLibrary.FURNITURE_CREATOR_PROPERTY.equals(propertyKey)) {
        furnitureComparator = new Comparator<CatalogPieceOfFurniture>() {
            public int compare(CatalogPieceOfFurniture piece1, CatalogPieceOfFurniture piece2) {
              return collator.compare(piece1.getCreator(), piece2.getCreator());
            }
          };
      } else if (FurnitureLibrary.FURNITURE_CATEGORY_PROPERTY.equals(propertyKey)) {
        furnitureComparator = new Comparator<CatalogPieceOfFurniture>() {
            public int compare(CatalogPieceOfFurniture piece1, CatalogPieceOfFurniture piece2) {
              String piece1Category = (String)furnitureLibrary.getPieceOfFurnitureLocalizedData(
                  piece1, controller.getFurnitureLangauge(), propertyKey, piece1.getCategory().getName());
              String piece2Category = (String)furnitureLibrary.getPieceOfFurnitureLocalizedData(
                  piece2, controller.getFurnitureLangauge(), propertyKey, piece2.getCategory().getName());
              return collator.compare(piece1Category, piece2Category);
            }
          };
      } else if (FurnitureLibrary.FURNITURE_PRICE_PROPERTY.equals(propertyKey)) {
        furnitureComparator = new Comparator<CatalogPieceOfFurniture>() {
            public int compare(CatalogPieceOfFurniture piece1, CatalogPieceOfFurniture piece2) {

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      if (ourSortValue instanceof String && otherSortValue instanceof String) {
        // Collator.getInstance cache's Collator object, so this is relatively
        // fast.  However, storing it as static somewhere might give a small
        // performance boost.  If such an approach is take, ensure that the static
        // variable is updated the user chooses an different language.
        Collator collator = Collator.getInstance(Locale.getDefault());
        return collator.compare(ourSortValue, otherSortValue);
      }
      try {
        return ourSortValue.compareTo(otherSortValue);
      } catch (ClassCastException e) {
        // It's possible that a row was created, but not refreshed yet.

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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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        }
        final RuleBasedCollator collator;
        if(arglen == 3) {
            Item thirdItem = argv.getItem(2);
            String collation = thirdItem.stringValue();
            Collator coll = CollationUtils.resolve(collation, dynEnv.getStaticContext());
            if(!(coll instanceof RuleBasedCollator)) {
                // If the specified collation does not support collation units an error
                // may be raised [err:FOCH0004].
                throw new DynamicError("err:FOCH0004", "Collator for the collation `" + collation
                        + "` is expected to be rule based collator, but was " + coll);

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        Item param1 = argv.getItem(0); // convention to be SingleCollection
        Item param2 = argv.getItem(1);
        if(param1.isEmpty() && param2.isEmpty()) {
            return BooleanValue.TRUE;
        }
        final Collator collator;
        final int arglen = argv.size();
        if(arglen == 3) {
            Item third = argv.getItem(2);
            final String collation = third.stringValue();
            collator = CollationUtils.resolve(collation, dynEnv.getStaticContext());

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            }
            return min;
        } else if(TypeUtil.subtypeOf(firstType, StringType.STRING)) {
            AtomicValue min = (AtomicValue) firstItem;
            final int arglen = argv.size();
            final Collator collator;
            if(arglen == 2) {
                Item sec = argv.getItem(1);
                Type secType = sec.getType();
                if(!TypeUtil.subtypeOf(secType, StringType.STRING)) {
                    throw new DynamicError("err:FORG0006", "second argument is expected to be xs:string, but was "
                            + secType);
                }
                String uri = sec.stringValue();
                collator = CollationUtils.resolve(uri, dynEnv.getStaticContext());
            } else {
                collator = Collator.getInstance(); // compare in default locale
            }
            while(argItor.hasNext()) {
                Item it = argItor.next();
                Type cmpType = it.getType();
                if(!TypeUtil.subtypeOf(cmpType, StringType.STRING)) {
                    throw new DynamicError("err:FORG0006", "imcomparable xs:string and " + cmpType);
                }
                if(collator.compare(it, firstItem) < 0) {
                    min = (AtomicValue) it;
                }
            }
            return min;
        } else {

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            }
            return max;
        } else if(TypeUtil.subtypeOf(firstType, StringType.STRING)) {
            AtomicValue max = (AtomicValue) firstItem;
            final int arglen = argv.size();
            final Collator collator;
            if(arglen == 2) {
                Item sec = argv.getItem(1);
                Type secType = sec.getType();
                if(!TypeUtil.subtypeOf(secType, StringType.STRING)) {
                    throw new DynamicError("err:FORG0006", "second argument is expected to be xs:string, but was "
                            + secType);
                }
                String uri = sec.stringValue();
                collator = CollationUtils.resolve(uri, dynEnv.getStaticContext());
            } else {
                collator = Collator.getInstance(); // compare in default locale
            }
            while(argItor.hasNext()) {
                Item it = argItor.next();
                Type cmpType = it.getType();
                if(!TypeUtil.subtypeOf(cmpType, StringType.STRING)) {
                    throw new DynamicError("err:FORG0006", "imcomparable xs:string and " + cmpType);
                }
                if(collator.compare(it, firstItem) > 0) {
                    max = (AtomicValue) it;
                }
            }
            return max;
        } else {

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        final int arglen = argv.size();
        assert (arglen == 2 || arglen == 3);
        if(arglen == 3) {
            Item thirdItem = argv.getItem(2);
            String collation = thirdItem.stringValue();
            Collator collator = CollationUtils.resolve(collation, dynEnv.getStaticContext());
            cmp = collator.compare(comparand1, comparand2);
        } else {
            cmp = comparand1.compareTo(comparand2);
        }
        return cmp == 0 ? XInteger.valueOf(0) : (cmp > 0 ? XInteger.valueOf(1)
                : XInteger.valueOf(-1));

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                }
            }
                        
            if(sortAlpha) {
                final TreeMap<CollationKey, YMarkTag> sort = new TreeMap<CollationKey, YMarkTag>();
          final Collator collator = Collator.getInstance(); 
          collator.setStrength(Collator.SECONDARY); 
                tit = tags.iterator();
              while(tit.hasNext() && count < top) {
                t = tit.next();
                sort.put(collator.getCollationKey(t.name()), t);
                count++;
              }
              tit = sort.values().iterator();
            } else {
              tit = tags.iterator();

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  }
  
  public void assertTreeIsSorted(JTree tree) {
    TreeModel model = tree.getModel();
    Object    root  = model.getRoot();
    Collator  comparator = Collator.getInstance();
    // For each category 
    for (int i = 0, n = model.getChildCount(root); i < n; i++) {
      Object rootChild = model.getChild(root, i);
      if (i < n - 1) {
        Object nextChild = model.getChild(root, i + 1);
        // Check alphatical order of categories nodes in tree 
        assertTrue("Categories not sorted", comparator.compare(
            getNodeText(tree, rootChild), 
            getNodeText(tree, nextChild)) <= 0);
      }
      // For each piece of furniture of a category
      for (int j = 0, m = model.getChildCount(rootChild) - 1; 
           j < m; j++) {
        Object child = model.getChild(rootChild, j);
        if (j < m - 1) {
          Object nextChild = model.getChild(rootChild, j + 1);
          // Check alphatical order of furniture nodes in tree 
          assertTrue("Furniture not sorted", comparator.compare(
              getNodeText(tree, child), 
              getNodeText(tree, nextChild)) <= 0);
        }
        assertTrue("Piece not a leaf", model.isLeaf(child));
      }

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