[Bprocessor-commit] model/src/net/sourceforge/bprocessor/model Observer.java,NONE,1.1 Project.java,1.12,1.13 Entity.java,1.1,1.2

[Michael L. <he...@us...>]

Update of /cvsroot/bprocessor/model/src/net/sourceforge/bprocessor/model
In directory sc8-pr-cvs1.sourceforge.net:/tmp/cvs-serv2428/src/net/sourceforge/bprocessor/model

Modified Files:
	Project.java Entity.java 
Added Files:
	Observer.java 
Log Message:
An observer mechanism has been implmented. Very simple change-propagation.

--- NEW FILE: Observer.java ---
//---------------------------------------------------------------------------------
// $Id: Observer.java,v 1.1 2006/01/03 13:03:32 henryml Exp $
//
// Copyright (c) 2005      The BProcessor Team (http://bprocessor.sourceforge.net) 
// Released under the Lesser GNU Public License v2.1
//---------------------------------------------------------------------------------

package net.sourceforge.bprocessor.model;

/**
 * The Observer interface is for observing changes to entities
 * in the project. When an entity is changed, the update message
 * is send to all observers with the entity supplied as
 * argument.
 */
public interface Observer {
  /**
   * Update
   * @param entity Changed entity
   */
  public void update(Entity entity);
}

Index: Entity.java
===================================================================
RCS file: /cvsroot/bprocessor/model/src/net/sourceforge/bprocessor/model/Entity.java,v
retrieving revision 1.1
retrieving revision 1.2
diff -C2 -d -r1.1 -r1.2
*** Entity.java	19 Dec 2005 19:37:54 -0000	1.1
--- Entity.java	3 Jan 2006 13:03:32 -0000	1.2
***************
*** 43,46 ****
--- 43,53 ----
      return "Entity";
    }
+   
+   /**
+    * Tell observers that this entity has changed
+    */
+   public void changed() {
+     Project.getInstance().changed(this);
+   }
  
  }

Index: Project.java
===================================================================
RCS file: /cvsroot/bprocessor/model/src/net/sourceforge/bprocessor/model/Project.java,v
retrieving revision 1.12
retrieving revision 1.13
diff -C2 -d -r1.12 -r1.13
*** Project.java	22 Dec 2005 10:35:01 -0000	1.12
--- Project.java	3 Jan 2006 13:03:32 -0000	1.13
***************
*** 10,13 ****
--- 10,15 ----
  import java.util.HashSet;
  import java.util.Iterator;
+ import java.util.LinkedList;
+ import java.util.List;
  import java.util.Set;
  
***************
*** 30,33 ****
--- 32,38 ----
    private static Project instance;
    
+   /** The observers */
+   private List observers;
+   
    /**
     * Get the instance
***************
*** 40,43 ****
--- 45,85 ----
      return instance;
    }
+   
+   /**
+    * Constructor for Project
+    */
+   public Project() {
+     super();
+     observers = new LinkedList();
+   }
+   
+   /**
+    * Add observer
+    * @param observer The observer
+    */
+   public void addObserver(Observer observer) {
+     observers.add(observer);
+   }
+   
+   /**
+    * Remove observer
+    * @param observer The observer
+    */
+   public void removeObserver(Observer observer) {
+     observers.remove(observer);
+   }
+  
+   /**
+    * Tell observers to update because an entity has changed
+    * @param entity The changed entity
+    */
+   public void changed(Entity entity) {
+     Iterator iter = observers.iterator();
+     while (iter.hasNext()) {
+       Observer current = (Observer) iter.next();
+       current.update(entity);
+     }
+   }
+   
   /**
    * Clear all objects