Examples of java.text.Format

java.text.Format
Format is an abstract base class for formatting locale-sensitive information such as dates, messages, and numbers.
Format defines the programming interface for formatting locale-sensitive objects into Strings (the format method) and for parsing Strings back into objects (the parseObject method).
Generally, a format's parseObject method must be able to parse any string formatted by its format method. However, there may be exceptional cases where this is not possible. For example, a format method might create two adjacent integer numbers with no separator in between, and in this case the parseObject could not tell which digits belong to which number.
Subclassing

The Java Platform provides three specialized subclasses of Format-- DateFormat, MessageFormat, and NumberFormat--for formatting dates, messages, and numbers, respectively.
Concrete subclasses must implement three methods:
1. format(Object obj, StringBuffer toAppendTo, FieldPosition pos)
2. formatToCharacterIterator(Object obj)
3. parseObject(String source, ParsePosition pos)
These general methods allow polymorphic parsing and formatting of objects and are used, for example, by MessageFormat. Subclasses often also provide additional format methods for specific input types as well as parse methods for specific result types. Any parse method that does not take a ParsePosition argument should throw ParseException when no text in the required format is at the beginning of the input text.
Most subclasses will also implement the following factory methods:
1. getInstance for getting a useful format object appropriate for the current locale
2. getInstance(Locale) for getting a useful format object appropriate for the specified locale
In addition, some subclasses may also implement other getXxxxInstance methods for more specialized control. For example, the NumberFormat class provides getPercentInstance and getCurrencyInstance methods for getting specialized number formatters.
Subclasses of Format that allow programmers to create objects for locales (with getInstance(Locale) for example) must also implement the following class method:
```
 public static Locale[] getAvailableLocales() 
```
And finally subclasses may define a set of constants to identify the various fields in the formatted output. These constants are used to create a FieldPosition object which identifies what information is contained in the field and its position in the formatted result. These constants should be named item_FIELD where item identifies the field. For examples of these constants, see ERA_FIELD and its friends in {@link DateFormat}.
Synchronization

Formats are generally 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 java.text.ParsePosition @see java.text.FieldPosition @see java.text.NumberFormat @see java.text.DateFormat @see java.text.MessageFormat @version 1.37, 12/03/05 @author Mark Davis

  }


  public String getCurrentDateAsString(FacesContext context,
      UICalendar calendar, Date date) throws IOException {


    Format formatter = new SimpleDateFormat("MM/yyyy");
    return formatter.format(date);
  }

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  }


  public String getCurrentDateAsString(FacesContext context,
      UICalendar calendar, Date date) throws IOException {


    Format formatter = new SimpleDateFormat("MM/yyyy");
    return formatter.format(date);
  }

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     * Check only using specified lenient future dates setting
     */
    private void checkShortParse(String msg, Calendar now, Calendar input, boolean lenient) throws ParseException {
        FTPTimestampParserImpl parser = new FTPTimestampParserImpl();
        parser.setLenientFutureDates(lenient);
        Format shortFormat = parser.getRecentDateFormat(); // It's expecting this format
        Format longFormat = new SimpleDateFormat("yyyy-MM-dd hh:mm");


        final String shortDate = shortFormat.format(input.getTime());
        Calendar output=parser.parseTimestamp(shortDate, now);
        int outyear = output.get(Calendar.YEAR);
        int outdom = output.get(Calendar.DAY_OF_MONTH);
        int outmon = output.get(Calendar.MONTH);
        int inyear = input.get(Calendar.YEAR);
        int indom = input.get(Calendar.DAY_OF_MONTH);
        int inmon = input.get(Calendar.MONTH);
        if (indom != outdom || inmon != outmon || inyear != outyear){
            fail("Test: '"+msg+"' Server="+longFormat.format(now.getTime())
                    +". Failed to parse "+shortDate
                    +". Actual "+longFormat.format(output.getTime())
                    +". Expected "+longFormat.format(input.getTime()));
        }
    }

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      error.setVariable("locale", locale);
    }


    error.setVariable("exception", cause);


    Format format = cause.getFormat();
    if (format instanceof SimpleDateFormat)
    {
      error.setVariable("format", ((SimpleDateFormat)format).toLocalizedPattern());
    }

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   */
  public static String convertToDecimalNotation(String numberAsString) {
    // Check for a scientific notation delimiter.
    if (numberAsString.indexOf("E") != -1
        || numberAsString.indexOf("e") != -1) {
      Format format = new DecimalFormat(UNROUNDED_DECIMAL_PATTERN);


      try {
        return format.format(new Double(numberAsString));
      } catch (NumberFormatException numberFormatException) {
        return NOT_A_NUMBER_PREFIX + " (" + numberAsString + ")";
      }
    }
    return numberAsString;

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        else {
            throw new IllegalStateException("The formatter is not an instance of DefaultFormatter.");
        }


        if (formatter instanceof InternationalFormatter) {
            Format f = ((InternationalFormatter) formatter).getFormat();
            if (f instanceof DateFormat) {
                _format = ((DateFormat) f);
            }
        }

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   * @param element
   * @return The formatted value.
   */
  public Object getValue(final ExpressionRuntime runtime, final ReportElement element)
  {
    final Format f = getFormatter();
    if (f == null)
    {
      return getNullValue();
    }


    final DataSource ds = getDataSource();
    if (ds == null)
    {
      return getNullValue();
    }


    final Object o = ds.getValue(runtime, element);
    if (o == null)
    {
      return getNullValue();
    }


    if (cachedResult != null && (cachedFormat != f) &&
        ObjectUtilities.equal(cachedValue, o))
    {
      return cachedResult;
    }


    try
    {
      cachedResult = f.format(o);
    }
    catch (IllegalArgumentException e)
    {
      cachedResult = getNullValue();
    }

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   * @param element
   * @return The formatted value.
   */
  public Object getValue(final ExpressionRuntime runtime, final ReportElement element)
  {
    final Format f = getFormatter();
    if (f == null)
    {
      return getNullValue();
    }


    final DataSource ds = getDataSource();
    if (ds == null)
    {
      return getNullValue();
    }


    final Object o = ds.getValue(runtime, element);
    if (o == null)
    {
      return getNullValue();
    }


    if (isValidOutput(o))
    {
      return o;
    }


    try
    {
      return f.parseObject(String.valueOf(o));
    }
    catch (ParseException e)
    {
      return null;
    }

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    if (locale != null)
    {
      error.setVariable("locale", locale);
    }
    error.setVariable("exception", e);
    Format format = e.getFormat();
    if (format instanceof SimpleDateFormat)
    {
      error.setVariable("format", ((SimpleDateFormat)format).toLocalizedPattern());
    }

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    if (locale != null)
    {
      error.setVariable("locale", locale);
    }
    error.setVariable("exception", e);
    Format format = e.getFormat();
    if (format instanceof SimpleDateFormat)
    {
      error.setVariable("format", ((SimpleDateFormat)format).toLocalizedPattern());
    }

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Examples of java.text.Format

Subclassing

Synchronization

Related Classes of java.text.Format