Examples of java.text.ChoiceFormat

java.text.ChoiceFormat

A ChoiceFormat allows you to attach a format to a range of numbers. It is generally used in a MessageFormat for handling plurals. The choice is specified with an ascending list of doubles, where each item specifies a half-open interval up to the next item:

 X matches j if and only if limit[j] <= X < limit[j+1]

If there is no match, then either the first or last index is used, depending on whether the number (X) is too low or too high. If the limit array is not in ascending order, the results of formatting will be incorrect. ChoiceFormat also accepts \u221E as equivalent to infinity(INF).

Note: ChoiceFormat differs from the other Format classes in that you create a ChoiceFormat object with a constructor (not with a getInstance style factory method). The factory methods aren't necessary because ChoiceFormat doesn't require any complex setup for a given locale. In fact, ChoiceFormat doesn't implement any locale specific behavior.

When creating a ChoiceFormat, you must specify an array of formats and an array of limits. The length of these arrays must be the same. For example,

limits = {1,2,3,4,5,6,7}
formats = {"Sun","Mon","Tue","Wed","Thur","Fri","Sat"}
limits = {0, 1, ChoiceFormat.nextDouble(1)}
formats = {"no files", "one file", "many files"}
(nextDouble can be used to get the next higher double, to make the half-open interval.)

Here is a simple example that shows formatting and parsing:

 double[] limits = {1,2,3,4,5,6,7}; String[] dayOfWeekNames = {"Sun","Mon","Tue","Wed","Thur","Fri","Sat"}; ChoiceFormat form = new ChoiceFormat(limits, dayOfWeekNames); ParsePosition status = new ParsePosition(0); for (double i = 0.0; i <= 8.0; ++i) { status.setIndex(0); System.out.println(i + " -> " + form.format(i) + " -> " + form.parse(form.format(i),status)); }

Here is a more complex example, with a pattern format:

 double[] filelimits = {0,1,2}; String[] filepart = {"are no files","is one file","are {2} files"}; ChoiceFormat fileform = new ChoiceFormat(filelimits, filepart); Format[] testFormats = {fileform, null, NumberFormat.getInstance()}; MessageFormat pattform = new MessageFormat("There {0} on {1}"); pattform.setFormats(testFormats); Object[] testArgs = {null, "ADisk", null}; for (int i = 0; i < 4; ++i) { testArgs[0] = new Integer(i); testArgs[2] = testArgs[0]; System.out.println(pattform.format(testArgs)); }

Specifying a pattern for ChoiceFormat objects is fairly straightforward. For example:

 ChoiceFormat fmt = new ChoiceFormat( "-1#is negative| 0#is zero or fraction | 1#is one |1.0<is 1+ |2#is two |2<is more than 2."); System.out.println("Formatter Pattern : " + fmt.toPattern()); System.out.println("Format with -INF : " + fmt.format(Double.NEGATIVE_INFINITY)); System.out.println("Format with -1.0 : " + fmt.format(-1.0)); System.out.println("Format with 0 : " + fmt.format(0)); System.out.println("Format with 0.9 : " + fmt.format(0.9)); System.out.println("Format with 1.0 : " + fmt.format(1)); System.out.println("Format with 1.5 : " + fmt.format(1.5)); System.out.println("Format with 2 : " + fmt.format(2)); System.out.println("Format with 2.1 : " + fmt.format(2.1)); System.out.println("Format with NaN : " + fmt.format(Double.NaN)); System.out.println("Format with +INF : " + fmt.format(Double.POSITIVE_INFINITY));

And the output result would be like the following:

  Format with -INF : is negative Format with -1.0 : is negative Format with 0 : is zero or fraction Format with 0.9 : is zero or fraction Format with 1.0 : is one Format with 1.5 : is 1+ Format with 2 : is two Format with 2.1 : is more than 2. Format with NaN : is negative Format with +INF : is more than 2.

Synchronization

Choice formats are not synchronized. It is recommended to create separate format instances for each thread. If multiple threads access a format concurrently, it must be synchronized externally. @see DecimalFormat @see MessageFormat @version 1.22 09/21/98 @author Mark Davis

                break;
            }
            break;
        case TYPE_CHOICE:
            try {
                newFormat = new ChoiceFormat(segments[3].toString());
            } catch (Exception e) {
                maxOffset = oldMaxOffset;
                throw new IllegalArgumentException("Choice Pattern incorrect");
            }
            break;

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  }


  String loc(String res, int param) {
    try {
      return MessageFormat.format(
          new ChoiceFormat(resourceBundle.getString(res)).format(param),
          new Object[] {new Integer(param)});
    } catch (Exception e) {
      return res + ": " + param;
    }
  }

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                            if (!doFormat) {
                                // If the currency is handled by a ChoiceFormat, then
                                // we're not going to use the expanded
                                // patterns. Instantiate the ChoiceFormat and return.
                                if (currencyChoice == null) {
                                    currencyChoice = new ChoiceFormat(s);
                                }
                                // We could almost return null or "" here, since the
                                // expanded affixes are almost not used at all in this
                                // situation. However, one method -- toPattern() -- still
                                // does use the expanded affixes, in order to set up a

View Full Code Here

            boolean[] isChoiceFormat = new boolean[1];
            currname = currency.getName(locale, Currency.SYMBOL_NAME, isChoiceFormat);
            // If this is a ChoiceFormat currency, then format an
            // arbitrary value; pick something != 1; more common.
            currencySymbol = isChoiceFormat[0]
                ? new ChoiceFormat(currname).format(2.0)
                : currname;
        } else {
            intlCurrencySymbol = "XXX";
            currencySymbol = "\u00A4"; // 'OX' currency symbol
        }

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                                    Currency.SYMBOL_NAME,
                                    isChoiceFormat);
            // If this is a ChoiceFormat currency, then format an
            // arbitrary value; pick something != 1; more common.
            currencySymbol = isChoiceFormat[0]
                ? new ChoiceFormat(currname).format(2.0)
                : currname;
        } else {
            intlCurrencySymbol = "XXX";
            currencySymbol = "\u00A4"; // 'OX' currency symbol
        }

View Full Code Here

                        // when zero-length is used to mean something.
                        continue;
                    } else if (name.charAt(0) == '=') {
                        name = name.substring(1);
                        if (name.length() > 0 && name.charAt(0) != '=') {
                            ChoiceFormat choice = new ChoiceFormat(name);
                            // Number n =
                            choice.parse(text, pos);
                            int len = pos.getIndex() - start;
                            if (len > max) {
                                iso = item.getKey();
                                max = len;
                            }

View Full Code Here

                break;
            }
            break;
        case TYPE_CHOICE:
            try {
                newFormat = new ChoiceFormat(segments[3].toString());
            } catch (Exception e) {
                maxOffset = oldMaxOffset;
                throw new IllegalArgumentException(
                                         "Choice Pattern incorrect");
            }

View Full Code Here

  }


  String loc(String res, int param) {
    try {
      return MessageFormat.format(
          new ChoiceFormat(resourceBundle.getString(res)).format(param),
          new Object[] {new Integer(param)});
    } catch (Exception e) {
      return res + ": " + param;
    }
  }

View Full Code Here

        Currency currH = Currency.getInstance("HUF");
        NumberFormat format = NumberFormat.getInstance(new Locale("hu", "HU"));
        assertSame("Returned incorrect currency", currH, format.getCurrency());


        // a subclass that doesn't support currency formatting
        ChoiceFormat cformat = new ChoiceFormat(
                "0#Less than one|1#one|1<Between one and two|2<Greater than two");
        try {
            ((NumberFormat) cformat).getCurrency();
            fail("Expected UnsupportedOperationException");
        } catch (UnsupportedOperationException e) {

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        NumberFormat format = NumberFormat.getInstance(new Locale("hu", "HU"));
        format.setCurrency(currA);
        assertSame("Returned incorrect currency", currA, format.getCurrency());


        // a subclass that doesn't support currency formatting
        ChoiceFormat cformat = new ChoiceFormat(
                "0#Less than one|1#one|1<Between one and two|2<Greater than two");
        try {
            ((NumberFormat) cformat).setCurrency(currA);
            fail("Expected UnsupportedOperationException");
        } catch (UnsupportedOperationException e) {

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