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/* Messages.java -- I18N related helper class

 Copyright (C) 2006, 2007 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 gnu.classpath.tools.jarsigner;

import gnu.classpath.Configuration;

import java.text.MessageFormat;

import java.util.HashMap;

import java.util.Map;

import java.util.MissingResourceException;

import java.util.ResourceBundle;

import java.util.logging.Logger;

/**

 * An initially generated Eclipse helper class to ease the use of localized

 * messages.

 * <p>

 * Enriched to handle localized message formats.

 */

class Messages

{

  private static final Logger log = Logger.getLogger(Messages.class.getName());

  private static final String BUNDLE_NAME = "gnu.classpath.tools.jarsigner.messages";

  private static final ResourceBundle RESOURCE_BUNDLE = ResourceBundle.getBundle(BUNDLE_NAME);

  private static final Map<String, MessageFormat> CACHED_FORMATS =

      new HashMap<String, MessageFormat>(5);

  private Messages()

  {

    super();

  }

  public static String getString(String key)

  {

    try

      {

        return RESOURCE_BUNDLE.getString(key);

      }

    catch (MissingResourceException e)

      {

        return constructMessage(key, null);

      }

  }

  public static String getFormattedString(String key, Object args)

  {

    MessageFormat mf = CACHED_FORMATS.get(key);

    if (mf == null)

      {

        String formatString = getString(key);

        if (formatString.startsWith("!"))

          return constructMessage(key, args);

        mf = new MessageFormat(formatString);

        CACHED_FORMATS.put(key, mf);

      }

    // if the argument is not an array, then build one consisting of the

    // sole argument before passing it to the format() method

    try

      {

        if (args instanceof Object[])

          return mf.format(args);

        return mf.format(new Object[] { args });

      }

    catch (IllegalArgumentException x)

      {

        if (Configuration.DEBUG)

          log.fine("Exception while rendering a message format keyed by ["

                   + key + "]: " + mf.toPattern());

        return constructMessage(mf.toPattern(), args);

      }

  }

  private static final String constructMessage(String m, Object args)

  {

    if (args == null)

      return '!' + m + '!';

    return '!' + m + '!' + String.valueOf(args) + '!';

  }

}