diff --git a/src/main/java/net/onrc/onos/ofcontroller/core/internal/SwitchStorageImpl.java b/src/main/java/net/onrc/onos/ofcontroller/core/internal/SwitchStorageImpl.java
index ea7fdf0..ec0c993 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/core/internal/SwitchStorageImpl.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/core/internal/SwitchStorageImpl.java
@@ -1,7 +1,5 @@
 package net.onrc.onos.ofcontroller.core.internal;
 
-import java.util.Collection;
-
 import net.onrc.onos.ofcontroller.core.ISwitchStorage;
 import net.onrc.onos.ofcontroller.core.INetMapTopologyObjects.IPortObject;
 import net.onrc.onos.ofcontroller.core.INetMapTopologyObjects.ISwitchObject;
@@ -14,16 +12,99 @@
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+/**
+ * This is the class for storing the information of switches into CassandraDB
+ */
 public class SwitchStorageImpl implements ISwitchStorage {
 	protected GraphDBOperation op;
 	protected static Logger log = LoggerFactory.getLogger(SwitchStorageImpl.class);
-
+	
+	/***
+	 * Initialize function. Before you use this class, please call this method
+	 * @param conf configuration file for Cassandra DB
+	 */
 	@Override
-	public void update(String dpid, SwitchState state, DM_OPERATION op) {
-		// TODO Auto-generated method stub
-		log.info("SwitchStorage:update dpid:{} state: {} ", dpid, state);
-        switch(op) {
+	public void init(String conf) {
+		GraphDBConnection conn = GraphDBConnection.getInstance(conf);
+		op = new GraphDBOperation(conn);
+	}
 
+	/***
+	 * Finalize/close function. After you use this class, please call this method.
+	 * It will close the DB connection.
+	 */
+	public void finalize() {
+		close();
+	}
+	
+	/***
+	 * Finalize/close function. After you use this class, please call this method.
+	 * It will close the DB connection. This is for Java gabage collection.
+	 */
+	@Override
+	public void close() {
+		op.close();		
+	}
+	
+	private void setStatus(String dpid, SwitchState state) {
+		ISwitchObject sw = op.searchSwitch(dpid);
+		
+		try {
+			if (sw != null) {
+				sw.setState(state.toString());
+				op.commit();
+				log.info("SwitchStorage:setStatus dpid:{} state: {} done", dpid, state);
+			}
+		} catch(Exception e) {
+			e.printStackTrace();
+			op.rollback();
+			log.info("SwitchStorage:setStatus dpid:{} state: {} failed: switch not found", dpid, state);	
+		}
+	}
+
+	/***
+	 * This function is for adding the switch into the DB.
+	 * @param dpid The switch dpid you want to add into the DB.
+	 */
+	@Override
+	public void addSwitch(String dpid) {
+		
+		log.info("SwitchStorage:addSwitch(): dpid {} ", dpid);
+		try {
+			ISwitchObject sw = op.searchSwitch(dpid);
+			if (sw != null) {
+				//If existing the switch. set The SW state ACTIVE. 
+				log.info("SwitchStorage:addSwitch dpid:{} already exists", dpid);
+				sw.setState(SwitchState.ACTIVE.toString());
+				op.commit();
+			} else {
+				sw = op.newSwitch(dpid);
+
+				if (sw != null) {
+					sw.setState(SwitchState.ACTIVE.toString());
+					op.commit();
+					log.info("SwitchStorage:addSwitch dpid:{} added", dpid);
+				} else {
+					log.error("switchStorage:addSwitch dpid:{} failed -> newSwitch failed", dpid);
+				}
+			}
+		} catch (Exception e) {
+			e.printStackTrace();
+			op.rollback();
+			log.info("SwitchStorage:addSwitch dpid:{} failed", dpid);
+		}
+	}
+	
+	/***
+	 * This function is for updating the switch into the DB.
+	 * @param dpid The switch dpid you want to update from the DB
+	 * @param state The state of the switch like ACTIVE, INACTIVE
+	 * @param dmope	The DM_OPERATION of the switch
+	 */
+	@Override
+	public void update(String dpid, SwitchState state, DM_OPERATION dmope) {
+		log.info("SwitchStorage:update dpid:{} state: {} ", dpid, state);
+        switch(dmope) {
         	case UPDATE:
         	case INSERT:
         	case CREATE:
@@ -39,29 +120,41 @@
         }
 	}
 
-	private void setStatus(String dpid, SwitchState state) {
-		ISwitchObject sw = op.searchSwitch(dpid);
-		if (sw != null) {
-			sw.setState(state.toString());
-			op.commit();
-			log.info("SwitchStorage:setStatus dpid:{} state: {} done", dpid, state);
-		} 	else {
-			op.rollback();
-			log.info("SwitchStorage:setStatus dpid:{} state: {} failed: switch not found", dpid, state);
+	/***
+	 * This function is for deleting the switch into the DB.
+	 * @param dpid The switch dpid you want to delete from the DB.
+	 */
+	@Override
+	public void deleteSwitch(String dpid) {
+		try {
+			ISwitchObject sw = op.searchSwitch(dpid);
+            if (sw  != null) {
+            	op.removeSwitch(sw);
+            	op.commit();
+            	log.info("SwitchStorage:DeleteSwitch dpid:{} done", dpid);
+            }
+		} catch (Exception e) {
+			e.printStackTrace();
+			op.rollback();			
+			log.error("SwitchStorage:deleteSwitch {} failed", dpid);
 		}
+
 	}
 
+	/***
+	 * This function is for adding the switch port into the DB.
+	 * @param dpid The switch dpid that has the port.
+	 * @param port The port you want to add the switch.
+	 */
 	@Override
 	public void addPort(String dpid, OFPhysicalPort port) {
-		// TODO Auto-generated method stub
 		
-        boolean portDown = ((OFPortConfig.OFPPC_PORT_DOWN.getValue() & port.getConfig()) > 0) ||
-        		((OFPortState.OFPPS_LINK_DOWN.getValue() & port.getState()) > 0);
-       if (portDown) {
-             deletePort(dpid, port.getPortNumber());
-             return;
+       if(((OFPortConfig.OFPPC_PORT_DOWN.getValue() & port.getConfig()) > 0) ||
+        					((OFPortState.OFPPS_LINK_DOWN.getValue() & port.getState()) > 0)) {
+    	     deletePort(dpid, port.getPortNumber());
+             return;  
        }
-             
+
 		try {
 			ISwitchObject sw = op.searchSwitch(dpid);
 
@@ -82,95 +175,20 @@
         		log.error("SwitchStorage:addPort dpid:{} port:{} : failed switch does not exist", dpid, port.getPortNumber());
             }
 		} catch (Exception e) {
-             // TODO: handle exceptions
 			e.printStackTrace();
 			op.rollback();
 			log.error("SwitchStorage:addPort dpid:{} port:{} failed", dpid, port.getPortNumber());
 		}	
 
 	}
-
-	@Override
-	public Collection<OFPhysicalPort> getPorts(long dpid) {
-		// TODO Auto-generated method stub
-		return null;
-	}
-
-	@Override
-	public OFPhysicalPort getPort(String dpid, short portnum) {
-		// TODO Auto-generated method stub
-		return null;
-	}
-
-	@Override
-	public OFPhysicalPort getPort(String dpid, String portName) {
-		// TODO Auto-generated method stub
-		return null;
-	}
-
-	@Override
-	public void addSwitch(String dpid) {
-		
-		log.info("SwitchStorage:addSwitch(): dpid {} ", dpid);
-		
-		try {
-			ISwitchObject sw = op.searchSwitch(dpid);
-			if (sw != null) {
-				/*
-				 *  Do nothing or throw exception?
-				 */
-
-				log.info("SwitchStorage:addSwitch dpid:{} already exists", dpid);
-				sw.setState(SwitchState.ACTIVE.toString());
-				op.commit();
-			} else {
-				sw = op.newSwitch(dpid);
-
-				if (sw != null) {
-					sw.setState(SwitchState.ACTIVE.toString());
-					op.commit();
-					log.info("SwitchStorage:addSwitch dpid:{} added", dpid);
-				} else {
-					log.error("switchStorage:addSwitch dpid:{} failed -> newSwitch failed", dpid);
-				}
-			}
-		} catch (Exception e) {
-			/*
-			 * retry?
-			 */
-			e.printStackTrace();
-			op.rollback();
-			log.info("SwitchStorage:addSwitch dpid:{} failed", dpid);
-		}
-
-
-	}
-
-	@Override
-	public void deleteSwitch(String dpid) {
-		// TODO Setting inactive but we need to eventually remove data
-
-		try {
-
-			ISwitchObject sw = op.searchSwitch(dpid);
-            if (sw  != null) {
-            	op.removeSwitch(sw);
- 
-            	op.commit();
-            	log.info("SwitchStorage:DeleteSwitch dpid:{} done", dpid);
-            }
-		} catch (Exception e) {
-             // TODO: handle exceptions
-			e.printStackTrace();
-			op.rollback();			
-			log.error("SwitchStorage:deleteSwitch {} failed", dpid);
-		}
-
-	}
-
+	
+	/***
+	 * This function is for deleting the switch port from the DB.
+	 * @param dpid The switch dpid that has the port.
+	 * @param port The port you want to delete the switch.
+	 */
 	@Override
 	public void deletePort(String dpid, short port) {
-		// TODO Auto-generated method stub
 		try {
 			ISwitchObject sw = op.searchSwitch(dpid);
 
@@ -184,37 +202,9 @@
             	}
             }
 		} catch (Exception e) {
-             // TODO: handle exceptions
 			e.printStackTrace();
 			op.rollback();
 			log.info("SwitchStorage:deletePort dpid:{} port:{} failed", dpid, port);
 		}	
 	}
-
-	@Override
-	public void deletePort(String dpid, String portName) {
-		// TODO Auto-generated method stub
-
-	}
-
-
-
-	@Override
-	public void init(String conf) {
-		GraphDBConnection conn = GraphDBConnection.getInstance(conf);
-		op = new GraphDBOperation(conn);
-	}
-
-
-
-	public void finalize() {
-		close();
-	}
-	
-	@Override
-	public void close() {
-		op.close();		
-	}
-
-	
 }