--- a/src/treecms/proto/merge/MergedTreeBuilder.java	Sun Oct 24 13:49:29 2010 +0900
+++ b/src/treecms/proto/merge/MergedTreeBuilder.java	Sun Oct 24 15:45:13 2010 +0900
@@ -5,6 +5,8 @@
 
 public class MergedTreeBuilder implements TreeBuilder
 {
+	private Node m_root;
+	
 	private TreeBuilder m_target1;
 	private TreeBuilder m_target2;
 	
@@ -14,11 +16,18 @@
 		m_target2 = _target2;
 	}
 	
+	public Node merge(Node _root1,Node _root2)
+	{
+		Node root = null;
+		
+		return root;
+	}
+	
 	@Override
 	public Node getContents()
 	{
 		// TODO Auto-generated method stub
-		return null;
+		return m_root;
 	}
 
 	@Override

--- a/src/treecms/proto/simple/SimpleTreeBuilder.java	Sun Oct 24 13:49:29 2010 +0900
+++ b/src/treecms/proto/simple/SimpleTreeBuilder.java	Sun Oct 24 15:45:13 2010 +0900
@@ -2,6 +2,8 @@
 
 import java.util.UUID;
 import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.atomic.AtomicLong;
+
 import treecms.proto.api.Node;
 import treecms.proto.api.TreeBuilder;
 
@@ -9,11 +11,14 @@
 {
 	private Node m_root;
 	
+	private AtomicLong m_ids;
 	private ConcurrentHashMap<Thread,NodeUUID> m_idMap;
 	
 	public SimpleTreeBuilder()
 	{
 		m_idMap = new ConcurrentHashMap<Thread,NodeUUID>();
+		m_ids = new AtomicLong();
+		
 		m_root = new SimpleNode(generateUUID());
 	}
 	
@@ -29,6 +34,18 @@
 	
 	public String generateUUID()
 	{
+		return generateUUID_AtomicLong();
+		//return generateUUID_ThreadLocal();
+	}
+	
+	public String generateUUID_AtomicLong()
+	{
+		//blocking?
+		return Long.toString(m_ids.getAndIncrement());
+	}
+	
+	public String generateUUID_ThreadLocal()
+	{
 		NodeUUID uuid;
 		uuid = m_idMap.get(Thread.currentThread());
 		if(uuid == null){

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/treecms/proto/util/NodeUUIDComparator.java	Sun Oct 24 15:45:13 2010 +0900
@@ -0,0 +1,9 @@
+package treecms.proto.util;
+
+public class NodeUUIDComparator
+{
+	public static String compare(String _target1,String _target2)
+	{
+		return Long.toString(Math.min(Long.parseLong(_target1),Long.parseLong(_target2)));
+	}
+}