--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/treecms/proto/id/DecrementalNodeID.java	Fri Jan 21 03:03:54 2011 +0900
@@ -0,0 +1,47 @@
+package treecms.proto.id;
+
+import treecms.proto.api.NodeID;
+
+public abstract class DecrementalNodeID implements NodeID
+{
+	@Override
+	public abstract NodeID create();
+
+	@Override
+	public abstract NodeID getTip();
+	
+	@Override
+	public abstract NodeID update();
+
+	@Override
+	public abstract String getUUID();
+
+	@Override
+	public abstract String getVersion();
+
+	@Override
+	public boolean isFamily(NodeID id)
+	{
+		return id.getUUID().equals(getUUID());
+	}
+
+	@Override
+	public boolean isOrderThen(NodeID _id)
+	{
+		if(Long.parseLong(_id.getVersion()) >= Long.parseLong(getVersion())){
+			return true;
+		}
+		return false;
+	}
+
+	@Override
+	public boolean equals(NodeID _id)
+	{
+		if(isFamily(_id)){
+			if(Long.parseLong(getVersion()) == Long.parseLong(_id.getVersion())){
+				return true;
+			}
+		}
+		return false;
+	}
+}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/treecms/proto/simple/SimpleDecNodeID.java	Fri Jan 21 03:03:54 2011 +0900
@@ -0,0 +1,67 @@
+package treecms.proto.simple;
+
+import java.util.UUID;
+import java.util.concurrent.atomic.AtomicLong;
+
+import treecms.proto.api.NodeID;
+import treecms.proto.id.DecrementalNodeID;
+
+public class SimpleDecNodeID extends DecrementalNodeID
+{
+	private String m_uuid;
+	private AtomicLong m_tip;
+	private long m_version;
+	
+	public SimpleDecNodeID()
+	{
+		m_uuid = UUID.randomUUID().toString();
+		m_tip = new AtomicLong();
+		m_tip.set(10000);
+		
+		m_version = m_tip.getAndDecrement();
+	}
+	
+	private SimpleDecNodeID(String _uuid,AtomicLong _tip,boolean _doUpdate)
+	{
+		m_uuid = _uuid;
+		m_tip = _tip;
+		
+		if(_doUpdate){
+			m_version = m_tip.getAndDecrement();
+			return;
+		}
+		
+		m_version = m_tip.get();
+	}
+	
+	@Override
+	public NodeID create()
+	{
+		return new SimpleDecNodeID();
+	}
+
+	@Override
+	public NodeID getTip()
+	{
+		return new SimpleDecNodeID(m_uuid,m_tip,false);
+	}
+
+	@Override
+	public String getUUID()
+	{
+		return m_uuid;
+	}
+
+	@Override
+	public String getVersion()
+	{
+		return Long.toString(m_version);
+	}
+
+	@Override
+	public NodeID update()
+	{
+		return new SimpleDecNodeID(m_uuid,m_tip,false);
+	}
+	
+}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/treecms/proto/simple/test/SimpleDecNodeIDTest.java	Fri Jan 21 03:03:54 2011 +0900
@@ -0,0 +1,19 @@
+package treecms.proto.simple.test;
+
+import org.junit.runner.JUnitCore;
+
+import treecms.proto.simple.SimpleDecNodeID;
+import treecms.proto.test.NodeIDTest;
+
+public class SimpleDecNodeIDTest extends NodeIDTest
+{
+	public static void main(String _args[])
+	{
+		JUnitCore.main(SimpleDecNodeIDTest.class.getName());
+	}
+
+	public SimpleDecNodeIDTest()
+	{
+		super(new SimpleDecNodeID());
+	}
+}