TypeDefinitionMismatchException.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 during {@link Column} unification if there is a contradiction
 * between two of the possible {@link DefinitionSource}s.
 *
 * @author WilliamC AT paneris.org
 */
public class TypeDefinitionMismatchException extends SeriousPoemException {
  private static final long serialVersionUID = 1L;

  /**
   * Column in which problem occurred.
   */
  public Column<?> column;
  /**
   * Type we are trying to assign.
   */
  public PoemType<?> newType;
  /**
   * Where the new type came from.
   */
  public DefinitionSource newTypeSource;

  /**
   * Constructor.
   */
  public TypeDefinitionMismatchException(Column<?> column,
                                         PoemType<?> newType,
                                         DefinitionSource newTypeSource) {
    this.column = column;
    this.newType = newType;
    this.newTypeSource = newTypeSource;
  }

  /**
   * @return The detail message
   * @see java.lang.Throwable#getMessage()
   */
  public String getMessage() {
    return
        "Column " + column + " has its type " +
            "(" + column.getType().getClass() + ") [" + column.getType() +
            "] overridden incompatibly in " + newTypeSource +
            ": (" + newType.getClass() + ") [" + newType + "]";
  }
}