--- trunk/OOPSE-3.0/src/brains/SnapshotManager.hpp	2004/10/22 23:09:57	1639
+++ trunk/OOPSE-3.0/src/brains/SnapshotManager.hpp	2004/10/25 04:08:14	1642
@@ -47,36 +47,50 @@ namespace oopse{
      */
     class SnapshotManager {
         public:
-
+            SnapshotManager() : currentSnapshot_(NULL), previousSnapshot_(NULL) {
+            }
+            virtual ~SnapshotManager();
             virtual bool advance() = 0;
 
-            Snapshot* getSnapshot(int id);
-            
-            Snapshot* getPrevSnapshot();
+            virtual Snapshot* getSnapshot(int id) = 0;
 
-            void setCurrentSnapshot();
-            
-            Snapshot* getCurrentSnapshot();
+            /**
+             * Returns the pointer of previous snapshot
+             * @return the pointer of previous snapshot
+             */
+            Snapshot* getPrevSnapshot() {
+                return previousSnapshot_;
+            }
 
-            void setCurrentSnapshot();
+            /**
+             * Returns the pointer of current snapshot
+             * @return the pointer of current snapshot
+             */            
+            Snapshot* getCurrentSnapshot() {
+                return currentSnapshot_;
+            }
             
             int getCapacity();
 
-            void setCapacity();
+            virtual void setCapacity(int capacity);
 
-            void getNotifyStatus();
+            bool getNotifyStatus();
             
-            void setNotifyStatus();
+            void setNotifyStatus(bool status);
 
             void attach(SnapshotObserver*);
 
             void detach(SnapshotObserver*);
 
             void notify();
+
+        protected:
+            Snapshot* currentSnapshot_;
+            Snapshot* previousSnapshot_;
             
         private:
-            vector<Snapshot*> snapshots_;
             vector<SnapshotObserver*> observers_;
+
     };
 
 }