TypeMismatchPoemException.java

/*
 * $Source$
 * $Revision$
 *
 * Copyright (C) 2000 William Chesters
 *
 * 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:
 *
 *     William Chesters <williamc@paneris.org>
 *     http://paneris.org/~williamc
 *     Obrechtstraat 114, 2517VX Den Haag, The Netherlands
 */

package org.melati.poem;

/**
 * Thrown when the type of an object isn't the one expected.
 *
 * @author WilliamC AT paneris.org
 * 
 */
public class TypeMismatchPoemException extends AppBugPoemException {


  /** The value we are trying to assign. */
  public Object value;
  /** The type of the destination.*/
  public PoemType<?> type;

  /** Constructor. */
  public TypeMismatchPoemException(Object value, PoemType<?> type) {
    this.value = value;
    this.type = type;
  }

  /**
   * @return The detail message
   * @see java.lang.Throwable#getMessage()
   */
  public String getMessage() {
    String s;
    try {
      s = String.valueOf(value);
      if (s.length() >= 100) s = "<long>";
    } catch (Exception e) {
      s = "<error>";
    }
    return
      "An unexpected type mismatch happened\n" +
      "Expected: " + type + "\n" +
      "Got: " + (value == null ? "null" : value.getClass().getName()) + "\n" +
      "Value: " + s;
  }
}