messageformat.java

gcc的组建

    return formatInternal(arguments, appendBuf, fp, null);
  }

  private StringBuffer formatInternal (Object arguments[],
                                       StringBuffer appendBuf,
				       FieldPosition fp,
				       FormatCharacterIterator output_iterator)
  {
    appendBuf.append(leader);
    if (output_iterator != null)
      output_iterator.append(leader);

    for (int i = 0; i < elements.length; ++i)
      {
	Object thisArg = null;
	boolean unavailable = false;
	if (arguments == null || elements[i].argNumber >= arguments.length)
	  unavailable = true;
	else
	  thisArg = arguments[elements[i].argNumber];

	AttributedCharacterIterator iterator = null;

	Format formatter = null;

	if (fp != null && i == fp.getField() && fp.getFieldAttribute() == Field.ARGUMENT)
	  fp.setBeginIndex(appendBuf.length());

	if (unavailable)
	  appendBuf.append("{" + elements[i].argNumber + "}");
	else
	  {
	    if (elements[i].setFormat != null)
	      formatter = elements[i].setFormat;
	    else if (elements[i].format != null)
	      {
	        if (elements[i].formatClass != null
		    && ! elements[i].formatClass.isInstance(thisArg))
	          throw new IllegalArgumentException("Wrong format class");
	    
	        formatter = elements[i].format;
	      }
	    else if (thisArg instanceof Number)
	      formatter = NumberFormat.getInstance(locale);
	    else if (thisArg instanceof Date)
	      formatter = DateFormat.getTimeInstance(DateFormat.DEFAULT, locale);
	    else
	      appendBuf.append(thisArg);
	  }

	if (fp != null && fp.getField() == i && fp.getFieldAttribute() == Field.ARGUMENT)
	  fp.setEndIndex(appendBuf.length());

	if (formatter != null)
	  {
	    // Special-case ChoiceFormat.
	    if (formatter instanceof ChoiceFormat)
	      {
		StringBuffer buf = new StringBuffer ();
		formatter.format(thisArg, buf, fp);
		MessageFormat mf = new MessageFormat ();
		mf.setLocale(locale);
		mf.applyPattern(buf.toString());
		mf.format(arguments, appendBuf, fp);
	      }
	    else
	      {
		if (output_iterator != null)
		  iterator = formatter.formatToCharacterIterator(thisArg);
		else
		  formatter.format(thisArg, appendBuf, fp);
	      }

	    elements[i].format = formatter;
	  }

	if (output_iterator != null)
	  {
	    HashMap hash_argument = new HashMap();
	    int position = output_iterator.getEndIndex();
	    
	    hash_argument.put (MessageFormat.Field.ARGUMENT,
			       new Integer(elements[i].argNumber));

	    
	    if (iterator != null)
	      {
		output_iterator.append(iterator);
		output_iterator.addAttributes(hash_argument, position, 
					      output_iterator.getEndIndex());
	      }	
	    else
	      output_iterator.append(thisArg.toString(), hash_argument);
	    
	    output_iterator.append(elements[i].trailer);
	  }
	
	appendBuf.append(elements[i].trailer);
      }
    
    return appendBuf;
  }

  /**
   * Returns the pattern with the formatted objects.  The first argument
   * must be a array of Objects.
   * This is equivalent to format((Object[]) objectArray, appendBuf, fpos)
   *
   * @param objectArray The object array to be formatted.
   * @param appendBuf The StringBuffer where the text is appened.
   * @param fpos A FieldPosition object (it is ignored).
   */
  public final StringBuffer format (Object objectArray, StringBuffer appendBuf,
				    FieldPosition fpos)
  {
    return format ((Object[])objectArray, appendBuf, fpos);
  }

  /**
   * Returns an array with the Formats for
   * the arguments.
   */
  public Format[] getFormats ()
  {
    Format[] f = new Format[elements.length];
    for (int i = elements.length - 1; i >= 0; --i)
      f[i] = elements[i].setFormat;
    return f;
  }

  /**
   * Returns the locale.
   */
  public Locale getLocale ()
  {
    return locale;
  }

  /**
   * Overrides Format.hashCode()
   */
  public int hashCode ()
  {
    // FIXME: not a very good hash.
    return pattern.hashCode() + locale.hashCode();
  }

  private MessageFormat ()
  {
  }

  /**
   * Creates a new MessageFormat object with
   * the specified pattern
   *
   * @param pattern The Pattern
   */
  public MessageFormat(String pattern)
  {
    this(pattern, Locale.getDefault());
  }

  /**
   * Creates a new MessageFormat object with
   * the specified pattern
   *
   * @param pattern The Pattern
   * @param locale The Locale to use
   *
   * @since 1.4
   */
  public MessageFormat(String pattern, Locale locale)
  {
    this.locale = locale;
    applyPattern (pattern);
  }

  /**
   * Parse a string <code>sourceStr</code> against the pattern specified
   * to the MessageFormat constructor.
   *
   * @param sourceStr the string to be parsed.
   * @param pos the current parse position (and eventually the error position).
   * @return the array of parsed objects sorted according to their argument number
   * in the pattern.
   */ 
  public Object[] parse (String sourceStr, ParsePosition pos)
  {
    // Check initial text.
    int index = pos.getIndex();
    if (! sourceStr.startsWith(leader, index))
      {
	pos.setErrorIndex(index);
	return null;
      }
    index += leader.length();

    Vector results = new Vector (elements.length, 1);
    // Now check each format.
    for (int i = 0; i < elements.length; ++i)
      {
	Format formatter = null;
	if (elements[i].setFormat != null)
	  formatter = elements[i].setFormat;
	else if (elements[i].format != null)
	  formatter = elements[i].format;

	Object value = null;
	if (formatter instanceof ChoiceFormat)
	  {
	    // We must special-case a ChoiceFormat because it might
	    // have recursive formatting.
	    ChoiceFormat cf = (ChoiceFormat) formatter;
	    String[] formats = (String[]) cf.getFormats();
	    double[] limits = (double[]) cf.getLimits();
	    MessageFormat subfmt = new MessageFormat ();
	    subfmt.setLocale(locale);
	    ParsePosition subpos = new ParsePosition (index);

	    int j;
	    for (j = 0; value == null && j < limits.length; ++j)
	      {
		subfmt.applyPattern(formats[j]);
		subpos.setIndex(index);
		value = subfmt.parse(sourceStr, subpos);
	      }
	    if (value != null)
	      {
		index = subpos.getIndex();
		value = new Double (limits[j]);
	      }
	  }
	else if (formatter != null)
	  {
	    pos.setIndex(index);
	    value = formatter.parseObject(sourceStr, pos);
	    if (value != null)
	      index = pos.getIndex();
	  }
	else
	  {
	    // We have a String format.  This can lose in a number
	    // of ways, but we give it a shot.
	    int next_index;
	    if (elements[i].trailer.length() > 0)
	      next_index = sourceStr.indexOf(elements[i].trailer, index);
	    else
	      next_index = sourceStr.length();
	    if (next_index == -1)
	      {
		pos.setErrorIndex(index);
		return null;
	      }
	    value = sourceStr.substring(index, next_index);
	    index = next_index;
	  }

	if (value == null
	    || ! sourceStr.startsWith(elements[i].trailer, index))
	  {
	    pos.setErrorIndex(index);
	    return null;
	  }

	if (elements[i].argNumber >= results.size())
	  results.setSize(elements[i].argNumber + 1);
	results.setElementAt(value, elements[i].argNumber);

	index += elements[i].trailer.length();
      }

    Object[] r = new Object[results.size()];
    results.copyInto(r);
    return r;
  }

  public Object[] parse (String sourceStr) throws ParseException
  {
    ParsePosition pp = new ParsePosition (0);
    Object[] r = parse (sourceStr, pp);
    if (r == null)
      throw new ParseException ("couldn't parse string", pp.getErrorIndex());
    return r;
  }

  public Object parseObject (String sourceStr, ParsePosition pos)
  {
    return parse (sourceStr, pos);
  }

  /**
   * Sets the format for the argument at an specified
   * index.
   *
   * @param variableNum The index.
   * @param newFormat The Format object.
   */
  public void setFormat (int variableNum, Format newFormat)
  {
    elements[variableNum].setFormat = newFormat;
  }

  /**
   * Sets the formats for the arguments.
   *
   * @param newFormats An array of Format objects.
   */
  public void setFormats (Format[] newFormats)
  {
    if (newFormats.length < elements.length)
      throw new IllegalArgumentException("Not enough format objects");

    int len = Math.min(newFormats.length, elements.length);
    for (int i = 0; i < len; ++i)
      elements[i].setFormat = newFormats[i];
  }

  /**
   * Sets the locale.
   *
   * @param loc A Locale
   */
  public void setLocale (Locale loc)
  {
    locale = loc;
    if (elements != null)
      {
	for (int i = 0; i < elements.length; ++i)
	  elements[i].setLocale(loc);
      }
  }

  /**
   * Returns the pattern.
   */
  public String toPattern ()
  {
    return pattern;
  }

  /**
   * Return the formatters used sorted by argument index. It uses the
   * internal table to fill in this array: if a format has been
   * set using <code>setFormat</code> or <code>setFormatByArgumentIndex</code>
   * then it returns it at the right index. If not it uses the detected
   * formatters during a <code>format</code> call. If nothing is known
   * about that argument index it just puts null at that position.
   * To get useful informations you may have to call <code>format</code>
   * at least once.
   *
   * @return an array of formatters sorted by argument index.
   */
  public Format[] getFormatsByArgumentIndex()
  {
    int argNumMax = 0;
    // First, find the greatest argument number.
    for (int i=0;i<elements.length;i++)
      if (elements[i].argNumber > argNumMax)
	argNumMax = elements[i].argNumber;

    Format[] formats = new Format[argNumMax];
    for (int i=0;i<elements.length;i++)
      {
	if (elements[i].setFormat != null)
	  formats[elements[i].argNumber] = elements[i].setFormat;
	else if (elements[i].format != null)
	  formats[elements[i].argNumber] = elements[i].format;
      }
    return formats;
  }

  /**
   * Set the format to used using the argument index number.
   *
   * @param argumentIndex the argument index.
   * @param newFormat the format to use for this argument.
   */
  public void setFormatByArgumentIndex(int argumentIndex,
				       Format newFormat)
  {
    for (int i=0;i<elements.length;i++)
      {
	if (elements[i].argNumber == argumentIndex)
	  elements[i].setFormat = newFormat;
      }
  }

  /**
   * Set the format for argument using a specified array of formatters
   * which is sorted according to the argument index. If the number of
   * elements in the array is fewer than the number of arguments only
   * the arguments specified by the array are touched.
   *
   * @param newFormats array containing the new formats to set.
   *
   * @throws NullPointerException if newFormats is null
   */
  public void setFormatsByArgumentIndex(Format[] newFormats)
  {
    for (int i=0;i<newFormats.length;i++)
      {
	// Nothing better than that can exist here.
	setFormatByArgumentIndex(i, newFormats[i]);
      }
  }

  // The pattern string.
  private String pattern;
  // The locale.
  private Locale locale;
  // Variables.
  private MessageFormatElement[] elements;
  // Leader text.
  private String leader;
}