--- a/app/models/TPGraph.java	Thu Mar 07 20:08:15 2013 +0900
+++ b/app/models/TPGraph.java	Fri Mar 08 16:18:53 2013 +0900
@@ -54,6 +54,18 @@
 		return graph;
 	}
 	
+	public Vertex addVertex(Object vId) {
+		return graph.addVertex(vId);
+	}
+
+	public Vertex getVertex(Object vId) {
+		return graph.getVertex(vId);
+	}
+	
+	public Edge getEdge(Object eId) {
+		return graph.getEdge(eId);
+	}
+	
 	public void setClaimRootId(Object id) {
 		this.claimRootId = id;
 	}
@@ -69,13 +81,13 @@
 	public Object getUserRootId() {
 		return userRootId;
 	}
-
+	
 	public Vertex getClaimRootVertex() {
-		return graph.getVertex(claimRootId);
+		return getVertex(claimRootId);
 	}
 	
 	public Vertex getUserRootVertex() {
-		return graph.getVertex(userRootId);
+		return getVertex(userRootId);
 	}
 
 	private Edge setLabel(Vertex fromV, Vertex toV, String label) {
@@ -95,7 +107,7 @@
 	}
 	
 	public Edge setLabelToAuthor(ClaimModel claim, String author) {
-		Vertex authorVertex = graph.getVertex(author);
+		Vertex authorVertex = getVertex(author);
 		//  claim ---author---> authorVertex(userVertex)
 		return setLabel(claim.getVertex(), authorVertex, NodeModel.L_AUTHOR);
 	}
@@ -107,7 +119,7 @@
 	
 	public Boolean setLabelToUsers(ClaimModel claim, String[] users, String label) {
 		for (String userName: users) {
-			Vertex userVertex = graph.getVertex(userName);
+			Vertex userVertex = getVertex(userName);
 			if (userVertex == null) {
 				return false;
 			}
@@ -117,7 +129,7 @@
 	}
 	
 	public Boolean setLabelStatusToUser(ClaimModel claim, String userName, String label, String status) {
-		Vertex userVertex = graph.getVertex(userName);
+		Vertex userVertex = getVertex(userName);
 		if (userVertex == null) { 
 			return false;
 		}
@@ -141,7 +153,7 @@
 	}
 	
 	public Object[] searchAllUser() {
-		Vertex userRootVertex = graph.getVertex(getUserRootId());
+		Vertex userRootVertex = getVertex(getUserRootId());
 		GremlinPipeline<Vertex,Vertex> pipe = new GremlinPipeline<Vertex,Vertex>();		
 		pipe.start(userRootVertex).out(CHILD);
 		ArrayList<Object> userArray = new ArrayList<Object>();
@@ -203,7 +215,7 @@
 	 * Return CLAIM numbers of above [id] CLAIM.
 	 */
 	public ArrayList<Object> getAllUpperVertexId(Object id) {
-		Vertex startV = graph.getVertex(id);
+		Vertex startV = getVertex(id);
 		ArrayList<Object> vertexArray = new ArrayList<Object>();
 		while (true) {
 			GremlinPipeline<Vertex,Vertex> pipe = new GremlinPipeline<Vertex,Vertex>();			
@@ -220,7 +232,7 @@
 	}
 	
 	public Object getOneUpperClaimVertexId(Object id) {
-		Vertex startV = graph.getVertex(id);
+		Vertex startV = getVertex(id);
 		GremlinPipeline<Vertex,Vertex> pipe = new GremlinPipeline<Vertex,Vertex>();
 		pipe.start(startV).in(NodeModel.L_QUESTION, NodeModel.L_REFUTATION, NodeModel.L_SUGGESTION);
 		if (pipe.hasNext()) { 
@@ -261,6 +273,9 @@
 		return latestTopClaim;
 	}
 	
+	/*
+	 * TODO: update TimeStamp
+	 */
 	public ClaimModel copyConsensusTree(ClaimModel claim) {
 		ClaimModel oldTopClaim = new ClaimModel(graph.getVertex(getTopClaimVertexId(claim.getId()))); 
 		ClaimModel latestTopClaim = copyDownClaims(oldTopClaim);