InvalidArgumentsException.java

/*
 * $Source$
 * $Revision$
 *
 * Copyright (C) 2005 Tim Pizey
 *
 * Part of Melati (http://melati.org), a framework for the rapid
 * development of clean, maintainable web applications.
 *
 * Melati is free software; Permission is granted to copy, distribute
 * and/or modify this software under the terms either:
 *
 * a) the GNU General Public License as published by the Free Software
 *    Foundation; either version 2 of the License, or (at your option)
 *    any later version,
 *
 *    or
 *
 * b) any version of the Melati Software License, as published
 *    at http://melati.org
 *
 * You should have received a copy of the GNU General Public License and
 * the Melati Software License along with this program;
 * if not, write to the Free Software Foundation, Inc.,
 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA to obtain the
 * GNU General Public License and visit http://melati.org to obtain the
 * Melati Software License.
 *
 * Feel free to contact the Developers of Melati (http://melati.org),
 * if you would like to work out a different arrangement than the options
 * outlined here.  It is our intention to allow Melati to be used by as
 * wide an audience as possible.
 *
 * This program 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.
 *
 * Contact details for copyright holder:
 *
 *     Tim Pizey <timp At paneris.org>
 *     http://paneris.org/~timp
 */

package org.melati.app;

import org.melati.util.MelatiRuntimeException;

/**
 * Thrown when an application was called with unexpected arguments.
 */
public class InvalidArgumentsException extends MelatiRuntimeException {
  private static final long serialVersionUID = 1L;
  
  String[] args = null;

  /**
   * Constructor.
   * 
   * @param args the argument array
   * @param problem the exception to be reported
   */
  public InvalidArgumentsException(String[] args, Exception problem) {
    super(problem);
    this.args = args;
  }

  /**
   * Constructor.
   * 
   * @param args the arguments passed in
   */
  public InvalidArgumentsException(String[] args) {
    this(args, null);
  }

  /**
   * @return the message.
   */
  public String getMessage() {
    return args == null ?
        "No arguments given" : 
        "Arguments `" + join(args, " ") + "' have wrong form" +
            (subException == null ? "" : ":\n" + subException.toString());
  }
  
  private String join(String[] array, String sep){
    StringBuffer sb = new StringBuffer();
    boolean hadOne = false;
    for (int i = 0; i < array.length; i++) {
      if (hadOne) sb.append(sep);
      hadOne = true;
      sb.append(array[i]);
    }
    return sb.toString();
  }
}