--- a/app/models/TPGraph.java	Wed Mar 06 16:57:13 2013 +0900
+++ b/app/models/TPGraph.java	Thu Mar 07 18:40:22 2013 +0900
@@ -100,6 +100,11 @@
 		return setLabel(claim.getVertex(), authorVertex, NodeModel.L_AUTHOR);
 	}
 	
+	public Edge setLabelPrev(ClaimModel fromClaim, ClaimModel toClaim) {
+		// fromClaim ---prev---> toClaim
+		return setLabel(fromClaim.getVertex(), toClaim.getVertex(), NodeModel.L_PREV );
+	}
+	
 	public Boolean setLabelToUsers(ClaimModel claim, String[] users, String label) {
 		for (String userName: users) {
 			Vertex userVertex = graph.getVertex(userName);
@@ -175,7 +180,7 @@
 		iter = set.iterator();
 		while (iter.hasNext()) {
 			Object childId = iter.next();
-			ArrayList<Object> array = getAllUpperVertex(childId);
+			ArrayList<Object> array = getAllUpperVertexId(childId);
 			for (Object parentId: array) {
 				/*
 				 * If there is a number of the number of parent and child in the [set],
@@ -197,7 +202,7 @@
 	/* 
 	 * Return CLAIM numbers of above [id] CLAIM.
 	 */
-	public ArrayList<Object> getAllUpperVertex(Object id) {
+	public ArrayList<Object> getAllUpperVertexId(Object id) {
 		Vertex startV = graph.getVertex(id);
 		ArrayList<Object> vertexArray = new ArrayList<Object>();
 		while (true) {
@@ -214,7 +219,7 @@
 		return vertexArray;
 	}
 	
-	public Object getOneUpperVertex(Object id) {
+	public Object getOneUpperClaimVertexId(Object id) {
 		Vertex startV = graph.getVertex(id);
 		GremlinPipeline<Vertex,Vertex> pipe = new GremlinPipeline<Vertex,Vertex>();
 		pipe.start(startV).in(NodeModel.L_QUESTION, NodeModel.L_REFUTATION, NodeModel.L_SUGGESTION);
@@ -226,6 +231,32 @@
 		}
 	}
 	
+	public Object getTopClaimVertexId(Object id) {
+		Object v = id;
+		Object upV = id;
+		while (upV != null) {
+			v = upV;
+			upV = getOneUpperClaimVertexId(v);
+		}
+		return v;
+	}
+	
+	private void copyDownClaimVertexAndSetLabel(ClaimModel cliam, String label) {
+		GremlinPipeline<Vertex, Vertex> pipe = new GremlinPipeline<Vertex, Vertex>();
+		pipe.start(claim.getVertex()).outE(label);
+		
+	}
+	
+	public ClaimModel copyConsensusTree(ClaimModel claim) {
+		ClaimModel topClaim = new ClaimModel(graph.getVertex(getTopClaimVertexId(claim.getId()))); 
+		
+		
+		ClaimModel copiedTopClaim = new ClaimModel(graph.addVertex(null));
+		
+		return copiedTopClaim;
+	}
+	
+	
 	public void shutdownGraph() {
 		if (path == null) {
 			return;