/*

  * $Source: /usr/cvsroot/melati/melati/src/main/java/org/melati/template/velocity/PropagateEvaluationExceptionHandler.java,v $

  * $Revision: 1.1 $

  *

  * Copyright (C) 2008 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.template.velocity;

 import java.lang.reflect.Method;

 import org.apache.velocity.app.event.InvalidReferenceEventHandler;

 import org.apache.velocity.context.Context;

 import org.apache.velocity.util.introspection.Info;

 import org.melati.template.TemplateEngineException;

 /**

  * @author timp

  * @since 1 Apr 2008

  * 

  */

 public class PropagateEvaluationExceptionHandler implements

     InvalidReferenceEventHandler {

   /**

    * Constructor.

    */

   public PropagateEvaluationExceptionHandler() {

   }

   public Object invalidGetMethod(Context context, String reference,

       Object object, String property, Info info) {

     return null;

   }

   public Object invalidMethod(Context context, String reference, Object object,

       String method, Info info) {

     if(object != null) { 

       Method[] methods = object.getClass().getMethods();

       for (int i = 0; i < methods.length; i++)

         if (methods[i].getName().equals(method)) 

           return null;

     }

     String message = "Invalid method ";

     message += (method == null) ? "(null)" : method;

     message += " called ";

     message += (reference == null) ? "(null reference)" : reference;

     message += (object == null) ? " (null object)" : " on object " + object;

     message += " at " + info;

     throw new TemplateEngineException(message);

   }

   public boolean invalidSetMethod(Context context, String leftreference,

       String rightreference, Info info) {

     return true;    

     /*

     throw new TemplateEngineException("Invalid set method " + 

         (rightreference == null ? "null" : rightreference)  

         + " called setting " + leftreference + " at " + info);

     */

   }

 }