/* Dynamic Coupling Metrics implemented using AspectJ
 * Copyright (C) 2004 Laurie Hendren, McGill University
 *
 * This code is based on the ideas presented in:
 *     Y. Hassoun, R. Johnson, S. Counsell  A Dynamic Runtime Coupling Metric
 *     for Meta-Level Architectures
 *     Proc. 8th European Conference on Software Maintenance and Reengineering,
 *     Tampere, Finland, March 2004 (CSMR 2004). 
 *
 * and computes the same metric as the code available at:
 *    http://www.dcs.bbk.ac.uk/~yhassoun/downloads/Interceptor.java
 *    http://www.dcs.bbk.ac.uk/~yhassoun/downloads/ClassRelationship.java
 *
 * However, the code is completely rewritten from the original to use a
 * much lighter weight data collection mechanism,  and to include the
 * possibility of accounting for objects being freed by the GC.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

package DCM;

import java.util.ResourceBundle;
import java.util.MissingResourceException;

public aspect ClassRelationship {

  static String mainclassname;   // will be set by an aspect applied at 
                                 //   beginning of main 
  
  /* Insert at the beginning of each main method advice which captures
   * the name of the main class.   We expect there to be a .properties
   * file for this class which lists the static coupling values.  
   */
  before() : execution(static void *..main(String[]))
    { mainclassname = 
         thisJoinPoint.getStaticPart().getSignature().
         getDeclaringType().getName();
    }

  /* Get the static coupling value for a class.   If no .properties file
   * exists,  or there is no entry for this classname, then an error message 
   * is given, and a value of 0 is returned.
   */
   public static String getParameter(String key) 
     { try 
         { ResourceBundle rb = ResourceBundle.getBundle(mainclassname);
	   String value = rb.getString(key); 
	   return(value);
         }
       catch (Exception e)
         { System.err.println("*** Unable to get value:  ");
	   System.err.println("*** " + e);
	   System.err.println("*** Using value of 0 ");
	   return("0");
	 }
     }
}