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

     * Returns a shared instance of {@link AngleFormat}. The return type is
     * {@link Format} in order to avoid class loading before necessary.
     */
    private static synchronized Format getAngleFormat() {
        if (format!=null) {
            final Format angleFormat = (Format) format.get();
            if (angleFormat!=null) {
                return angleFormat;
            }
        }
        final Format newFormat = new AngleFormat("D\u00b0MM.m'", Locale.US);
        format = new SoftReference<Format>(newFormat);
        return newFormat;
    }

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        //Irrespective of the scope ,if the dateformat has provided ,
        // should return the Date according to the provided format


        if (SynapseConstants.SYSTEM_DATE.equals(key)) {
            if (dateformat != null) {
                Format formatter = new SimpleDateFormat(dateformat.toString());
                return formatter.format(new java.util.Date());
            } else {
                Format formatter = new SimpleDateFormat();
                return formatter.format(new java.util.Date());
            }
        }


        //return the current system time as a string , don't care scope
        if (SynapseConstants.SYSTEM_TIME.equals(key)) {

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  private String toText(Object value, Object object) {
    if (value == null)
      return EMPTY_STRING;
    if (defaultValue != null && hideZeroValues && defaultValue.equals(value))
      return EMPTY_STRING;
    Format f = getFormat(object);
    if (f != null) {
      return f.format(value);
    } else {
      if (isHyperlink())
        return ((Hyperlink)value).toString();
      return FieldConverter.toString(value, getDisplayType(), null); // Convert
                                      // to

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    // log.warn("Tried to set text of read only field" + getId());
      return;
    }
    Object value = preprocessText(object, textValue, context);
    if (value == textValue) {
      Format f = getFormat(object);
      if (f != null) {
        try {
          value = f.parseObject(textValue);
        } catch (ParseException e) {
          f = getSecondaryFormat(object); // allow money to parse as number too
          boolean secondOK = false;
          if (f != null) {
            try {
              value = f.parseObject(textValue);
              secondOK = true;
            } catch (ParseException e1) {
            }
          }
          if (!secondOK)

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      return;
    }
    Object object = node.getImpl();
    Object value = preprocessText(object, textValue, context);
    if (value == textValue) {
      Format f = getFormat(object);
      if (f != null) {
        try {
          value = f.parseObject(textValue);
        } catch (ParseException e) {
          throw new FieldParseException(e);
        }
      } else {
        value = FieldConverter.convert(textValue, hasExternalType() ? externalType : internalType, context); // converts

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    /**
     * Ensures that the parse/format separation is correctly maintained. 
     */
    public void testCompositeFormat() {


        Format parser = new Format() {
            public StringBuffer format(Object obj, StringBuffer toAppendTo, FieldPosition pos) {
                throw new UnsupportedOperationException("Not implemented");
            }


            public Object parseObject(String source, ParsePosition pos) {
                return null;    // do nothing
            }
        };


        Format formatter = new Format() {
            public StringBuffer format(Object obj, StringBuffer toAppendTo, FieldPosition pos) {
                return null;    // do nothing
            }


            public Object parseObject(String source, ParsePosition pos) {

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        assertEquals( "Parser get method incorrectly implemented", parser, composite.getParser() );
        assertEquals( "Formatter get method incorrectly implemented", formatter, composite.getFormatter() );
    }


    public void testUsage() throws Exception {
        Format f1 = new SimpleDateFormat("MMddyyyy", Locale.ENGLISH);
        Format f2 = new SimpleDateFormat("MMMM d, yyyy", Locale.ENGLISH);
        CompositeFormat c = new CompositeFormat(f1, f2);
        String testString = "January 3, 2005";
        assertEquals(testString, c.format(c.parseObject("01032005")));
        assertEquals(testString, c.reformat("01032005"));
    }

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   * @return
   */
  private String append(Object... params){
    NumberFormat numberFormat = NumberFormat.getInstance(Locale.FRENCH);
    numberFormat.setMaximumFractionDigits(1);
    Format formatter = new SimpleDateFormat(Constants.DATE_FORMAT);
    String srcParam = "";
    for(Object param : params){
      if(param != null){
        if(param instanceof String){
          srcParam += param;
        }
        if(param instanceof Double){
          srcParam += numberFormat.format(param);
        }
        if(param instanceof Float){
          srcParam += numberFormat.format(param);
        }
        if(param instanceof Date){
          srcParam += formatter.format(param);
        }
      } else{
        srcParam += "null";
      }
      srcParam += Constants.SEPRATE;

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   */
  private String append(Object... params){
    numberFormat = NumberFormat.getInstance(Locale.FRENCH);
    numberFormat.setMaximumFractionDigits(1);  
    dateFormat = DateFormat.getDateInstance(DateFormat.DEFAULT);
    Format formatter = new SimpleDateFormat(Constants.DATE_FORMAT);
    String srcParam = "";
    for(Object param : params){
      if(param != null){
        if(param instanceof String){
          srcParam += param;
        }
        if(param instanceof Double){
          srcParam += numberFormat.format(param);
        }
        if(param instanceof Float){
          srcParam += numberFormat.format(param);
        }
        if(param instanceof Date){
          srcParam += formatter.format(param);
        }
      } else{
        srcParam += "null";
      }
      srcParam += Constants.SEPRATE;

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        formats = new HashMap<String,Format>();


        // init built-in formats


        Format zipFormat = ZipPlusFourFormat.instance;
        addFormat("00000\\-0000", zipFormat);
        addFormat("00000-0000", zipFormat);


        Format phoneFormat = PhoneFormat.instance;
        // allow for format string variations
        addFormat("[<=9999999]###\\-####;\\(###\\)\\ ###\\-####", phoneFormat);
        addFormat("[<=9999999]###-####;(###) ###-####", phoneFormat);
        addFormat("###\\-####;\\(###\\)\\ ###\\-####", phoneFormat);
        addFormat("###-####;(###) ###-####", phoneFormat);


        Format ssnFormat = SSNFormat.instance;
        addFormat("000\\-00\\-0000", ssnFormat);
        addFormat("000-00-0000", ssnFormat);
    }

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Examples of java.text.Format

Subclassing

Synchronization

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