decimalformatsymbols.java

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/* DecimalFormatSymbols.java -- Format symbols used by DecimalFormat
   Copyright (C) 1999, 2000, 2001, 2004 Free Software Foundation, Inc.

This file is part of GNU Classpath.

GNU Classpath is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
 
GNU Classpath is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
General Public License for more details.

You should have received a copy of the GNU General Public License
along with GNU Classpath; see the file COPYING.  If not, write to the
Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA.

Linking this library statically or dynamically with other modules is
making a combined work based on this library.  Thus, the terms and
conditions of the GNU General Public License cover the whole
combination.

As a special exception, the copyright holders of this library give you
permission to link this library with independent modules to produce an
executable, regardless of the license terms of these independent
modules, and to copy and distribute the resulting executable under
terms of your choice, provided that you also meet, for each linked
independent module, the terms and conditions of the license of that
module.  An independent module is a module which is not derived from
or based on this library.  If you modify this library, you may extend
this exception to your version of the library, but you are not
obligated to do so.  If you do not wish to do so, delete this
exception statement from your version. */


package java.text;

import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.Serializable;
import java.util.Currency;
import java.util.Locale;
import java.util.MissingResourceException;
import java.util.ResourceBundle;

/**
 * This class is a container for the symbols used by 
 * <code>DecimalFormat</code> to format numbers and currency
 * for a particular locale.  These are
 * normally handled automatically, but an application can override
 * values as desired using this class.
 *
 * @author Tom Tromey ([e-mail])
 * @author Aaron M. Renn ([e-mail])
 * @author Andrew John Hughes ([e-mail])
 * @date February 24, 1999
 * @see java.text.DecimalFormat
 */
/* Written using "Java Class Libraries", 2nd edition, plus online
 * API docs for JDK 1.2 from http://www.javasoft.com.
 * Status:  Believed complete and correct to 1.2.
 */
public final class DecimalFormatSymbols implements Cloneable, Serializable
{
  public Object clone ()
  {
    try
      {
	return super.clone ();
      }
    catch(CloneNotSupportedException e)
      {
	return null;
      }
  }

  /**
   * This method initializes a new instance of
   * <code>DecimalFormatSymbols</code> for the default locale.
   */
  public DecimalFormatSymbols ()
  {
    this (Locale.getDefault());
  }

  /**
   * Retrieves a valid string, either using the supplied resource
   * bundle or the default value.
   *
   * @param bundle the resource bundle to use to find the string.
   * @param name key for the string in the resource bundle.
   * @param def default value for the string.
   */
  private String safeGetString(ResourceBundle bundle,
                               String name, String def)
  {
    if (bundle != null)
      {
	try
	  {
	    return bundle.getString(name);
	  }
	catch (MissingResourceException x)
	  {
	  }
      }
    return def;
  }

  private char safeGetChar(ResourceBundle bundle,
                           String name, char def)
  {
    String r = null;
    if (bundle != null)
      {
	try
	  {
	    r = bundle.getString(name);
	  }
	catch (MissingResourceException x)
	  {
	  }
      }
    if (r == null || r.length() < 1)
      return def;
    return r.charAt(0);
  }

  /**
   * This method initializes a new instance of
   * <code>DecimalFormatSymbols</code> for the specified locale.
   * <strong>Note</strong>: if the locale does not have an associated
   * <code>Currency</code> instance, the currency symbol and
   * international currency symbol will be set to the strings "?"
   * and "XXX" respectively.  This generally happens with language
   * locales (those with no specified country), such as
   * <code>Locale.ENGLISH</code>.
   *
   * @param loc The local to load symbols for.
   * @throws NullPointerException if the locale is null.
   */
  public DecimalFormatSymbols (Locale loc)
  {
    ResourceBundle res;

    currency = Currency.getInstance("XXX");
    currencySymbol = "?";
    intlCurrencySymbol = "XXX";
    try
      {
	res = ResourceBundle.getBundle("gnu.java.locale.LocaleInformation",
		loc, ClassLoader.getSystemClassLoader());
      }
    catch (MissingResourceException x)
      {
	res = null;
      }
    try
      {
	Currency localeCurrency = Currency.getInstance(loc);
	if (localeCurrency != null)
	  {
	    setCurrency(localeCurrency);
	  }
      }
    catch(IllegalArgumentException exception)
      {
	/* Locale has an invalid currency */
      }
    decimalSeparator = safeGetChar (res, "decimalSeparator", '.');
    digit = safeGetChar (res, "digit", '#');
    exponential = safeGetChar (res, "exponential", 'E');
    groupingSeparator = safeGetChar (res, "groupingSeparator", ',');
    infinity = safeGetString (res, "infinity", "\u221e");
    try
      {
	monetarySeparator = safeGetChar (res, "monetarySeparator", '.');
      }
    catch (MissingResourceException x)
      {
	monetarySeparator = decimalSeparator;
      }
    minusSign = safeGetChar (res, "minusSign", '-');
    NaN = safeGetString (res, "NaN", "\ufffd");
    patternSeparator = safeGetChar (res, "patternSeparator", ';');
    percent = safeGetChar (res, "percent", '%');
    perMill = safeGetChar (res, "perMill", '\u2030');
    zeroDigit = safeGetChar (res, "zeroDigit", '0');
    locale = loc;
  }

  /**
   * This method this this object for equality against the specified object.
   * This will be true if and only if the following criteria are met with
   * regard to the specified object:
   * <p>
   * <ul>
   * <li>It is not <code>null</code>.</li>
   * <li>It is an instance of <code>DecimalFormatSymbols</code>.</li>
   * <li>All of its symbols are identical to the symbols in this object.</li>
   * </ul>
   *
   * @return <code>true</code> if the specified object is equal to this
   * object, <code>false</code> otherwise.
   */
  public boolean equals (Object obj)
  {
    if (! (obj instanceof DecimalFormatSymbols))
      return false;
    DecimalFormatSymbols dfs = (DecimalFormatSymbols) obj;
    return (currencySymbol.equals(dfs.currencySymbol)
	    && decimalSeparator == dfs.decimalSeparator
	    && digit == dfs.digit
	    && exponential == dfs.exponential
	    && groupingSeparator == dfs.groupingSeparator
	    && infinity.equals(dfs.infinity)
	    && intlCurrencySymbol.equals(dfs.intlCurrencySymbol)
	    && minusSign == dfs.minusSign
	    && monetarySeparator == dfs.monetarySeparator
	    && NaN.equals(dfs.NaN)
	    && patternSeparator == dfs.patternSeparator
	    && percent == dfs.percent
	    && perMill == dfs.perMill
	    && zeroDigit == dfs.zeroDigit);
  }

  /**
   * Returns the currency corresponding to the currency symbol stored
   * in this instance of <code>DecimalFormatSymbols</code>.
   *
   * @return An instance of <code>Currency</code> which matches
   *         the currency used, or null if there is no corresponding
   *         instance.
   */
  public Currency getCurrency ()
  {
    return currency;
  }

  /**
   * This method returns the currency symbol in local format.  For example,
   * "$" for Canadian dollars.
   *
   * @return The currency symbol in local format.
   */
  public String getCurrencySymbol ()
  {
    return currencySymbol;
  }

  /**
   * This method returns the character used as the decimal point.
   *
   * @return The character used as the decimal point.
   */
  public char getDecimalSeparator ()
  {
    return decimalSeparator;
  }

  /**
   * This method returns the character used to represent a digit in a
   * format pattern string.
   *
   * @return The character used to represent a digit in a format
   * pattern string. 
   */
  public char getDigit ()
  {
    return digit;
  }

  /**
   * This method returns the character used to represent the exponential
   * format.  This is a GNU Classpath extension.
   *
   * @return the character used to represent an exponential in a format
   *         pattern string.
   */
  char getExponential ()
  {
    return exponential;
  }

  /**
   * This method sets the character used to separate groups of digits.  For
   * example, the United States uses a comma (,) to separate thousands in
   * a number.
   *
   * @return The character used to separate groups of digits.
   */
  public char getGroupingSeparator ()
  {
    return groupingSeparator;
  }

  /**
   * This method returns the character used to represent infinity.
   *
   * @return The character used to represent infinity.
   */
  public String getInfinity ()
  {
    return infinity;
  }

  /**
   * This method returns the ISO 4217 currency code for
   * the currency used.
   *
   * @return the ISO 4217 currency code.
   */
  public String getInternationalCurrencySymbol ()
  {
    return intlCurrencySymbol;
  }

  /**
   * This method returns the character used to represent the minus sign.
   *
   * @return The character used to represent the minus sign.
   */
  public char getMinusSign ()
  {
    return minusSign;
  }

  /**
   * This method returns the character used to represent the decimal
   * point for currency values.
   *
   * @return The decimal point character used in currency values.
   */
  public char getMonetaryDecimalSeparator ()
  {
    return monetarySeparator;
  }

  /**
   * This method returns the string used to represent the NaN (not a number)
   * value.