--- a/rep/Editor.java	Tue Aug 26 09:52:08 2008 +0900
+++ b/rep/Editor.java	Tue Aug 26 16:33:47 2008 +0900
@@ -1,6 +1,7 @@
 package rep;
 
 import java.nio.channels.SocketChannel;
+import java.util.LinkedList;
 import java.util.StringTokenizer;
 
 public class Editor {
@@ -11,6 +12,8 @@
 	private String port;
 	//public int getEID;
 	private String file;
+	private LinkedList<REPCommand> undoCommandList = new LinkedList<REPCommand>();
+	private LinkedList<Integer> temp = new LinkedList<Integer>();
 
 	public Editor(int editorNo, SocketChannel channel){
 		this.eid = editorNo;
@@ -82,4 +85,33 @@
 		myChannel = channel;
 	}
 
+	public void addUndoCommand(REPCommand command) {
+		if(command.cmd == REP.SMCMD_GET_UNDO_ACK){
+			command.setCMD((temp.get(0)).intValue());
+			temp.remove();
+		}
+		
+		undoCommandList.addFirst(command);
+		System.out.println(undoCommandList);
+//		if(undoCommandList.size() > 10){
+//			for(REPCommand undoCommand : undoCommandList){
+//				send(undoCommand);
+//			}
+//			undoCommandList.clear();
+//		}
+	}
+
+	public void undo() {
+		// TODO Auto-generated method stub
+		for(REPCommand undoCommand : undoCommandList){
+			send(undoCommand);
+		}
+		undoCommandList.clear();
+	}
+
+	public void setKindOfUndoCmd(int cmd) {
+		// TODO Auto-generated method stub
+		temp .add(cmd);
+	}
+
 }

--- a/rep/EditorList.java	Tue Aug 26 09:52:08 2008 +0900
+++ b/rep/EditorList.java	Tue Aug 26 16:33:47 2008 +0900
@@ -107,4 +107,24 @@
 		return numberOfEditor;
 	}
 
+
+	public Editor getEditor(SocketChannel channel) {
+		// TODO Auto-generated method stub
+		Editor editor1 = null;
+		for(Editor editor: editorList){
+			if(channel == editor.getChannel()){
+				editor1 = editor;
+			}
+		}
+		return editor1;
+	}
+
+
+	public void undoAllEditors() {
+		// TODO Auto-generated method stub
+		for(Editor editor : editorList){
+			editor.undo();
+		}
+	}
+
 }

--- a/rep/REP.java	Tue Aug 26 09:52:08 2008 +0900
+++ b/rep/REP.java	Tue Aug 26 16:33:47 2008 +0900
@@ -37,4 +37,6 @@
 	public static final int SMCMD_UPDATE_DOWN = 68;		//obsolete
 	public static final int SMCMD_CH_MASTER = 69;
 	public static final int SMCMD_CH_MASTER_ACK = 70;
+	public static final int SMCMD_GET_UNDO = 71;
+	public static final int SMCMD_GET_UNDO_ACK = 72;
 }

--- a/rep/REPActionListener.java	Tue Aug 26 09:52:08 2008 +0900
+++ b/rep/REPActionListener.java	Tue Aug 26 16:33:47 2008 +0900
@@ -1,5 +1,8 @@
 package rep;
 
 public interface REPActionListener {
+	
 	public void ActionOccured(REPActionEvent event);
+
+	public void undo();
 }

--- a/rep/REPPacketReceive.java	Tue Aug 26 09:52:08 2008 +0900
+++ b/rep/REPPacketReceive.java	Tue Aug 26 16:33:47 2008 +0900
@@ -49,7 +49,7 @@
 			e1.printStackTrace();
 		}  // limit = read length
 		if (len !=HEADER_SIZE) {
-			System.out.println("‚Ä‚·");
+			System.out.println("��");
 			// this can't happen
 		}
 		header.rewind();  // position = 0
@@ -71,7 +71,7 @@
 		}  // limit = read length
 		if (len != textsiz * 2) {
 			// this can't happen
-			System.out.println("‚ ‚Æ");
+			System.out.println("��");
 		}
 		textBuffer.rewind();
 		for(int i=0;i<textsiz;i++) {
@@ -106,7 +106,7 @@
 			e1.printStackTrace();
 		}  // limit = read length
 		if (len !=HEADER_SIZE) {
-			System.out.println("‚Ä‚·");
+			System.out.println("��");
 			// this can't happen
 		}
 		header.rewind();  // position = 0
@@ -136,7 +136,7 @@
 		}  // limit = read length
 		if (len != textsiz) {
 			// this can't happen
-			System.out.println("‚ ‚Æ");
+			System.out.println("��");
 		}
 		textBuffer.rewind();
 

--- a/rep/RPanel.java	Tue Aug 26 09:52:08 2008 +0900
+++ b/rep/RPanel.java	Tue Aug 26 16:33:47 2008 +0900
@@ -53,6 +53,8 @@
 	private JComboBox comboSession;
 	private JButton buttonSelect;
 	private REPActionListener actionListener;
+	private JButton buttonUndo;
+	private REPActionListener undoListener;
 
 	public RPanel() {
 		button = new JButton("Connect");
@@ -70,6 +72,7 @@
 		comboEditor = new JComboBox();
 		comboSession = new JComboBox();
 		buttonSelect = new JButton("Select");
+		buttonUndo = new JButton("Undo");
 		
 		
 		button.setBounds(160, 5, 100, 20);
@@ -91,6 +94,7 @@
 		comboEditor.setBounds(450, 50, 100, 50);
 		comboSession.setBounds(450, 100, 100, 50);
 		buttonSelect.setBounds(450, 180, 100, 20);
+		buttonUndo.setBounds(450, 140, 100, 20);
 				
 
 		this.setLayout(null);
@@ -106,9 +110,11 @@
 		//this.add(comboEditor);
 		//this.add(comboSession);
 		this.add(buttonSelect);
+		this.add(buttonUndo);
 
 		button.addActionListener(this);
 		buttonSelect.addActionListener(this);
+		buttonUndo.addActionListener(this);
 	}
 	
 	public void addSessionTree(int SID){
@@ -126,6 +132,9 @@
 			*/
 			actionListener.ActionOccured(new REPActionEvent((EditorPlus) e_list.get(editor_table.getSelectedRow()),
 					(SessionPlus)s_list.get(session_table.getSelectedRow())));
+		}else if(event.getSource() == buttonUndo){
+			//System.out.println("Undo!");
+			actionListener.undo();
 		}
 	}
 
@@ -133,13 +142,17 @@
 		System.out.println(listener.toString());
 		this.listener = listener;
 	}
+	
+	public void addUndoListener(REPActionListener listener3){
+		undoListener = listener3;
+	}
 
 	public void setComboEditor(int eid, SocketChannel channel) {
 		//comboEditor.addItem("Editor:"+eid);
 		comboEditor.addItem(new EditorPlus(eid, channel));
 	}
 
-	public void REPActionListener(REPActionListener listener2) {
+	public void addREPActionListener(REPActionListener listener2) {
 		this.actionListener = listener2;
 	}
 

--- a/rep/ServerSample.java	Tue Aug 26 09:52:08 2008 +0900
+++ b/rep/ServerSample.java	Tue Aug 26 16:33:47 2008 +0900
@@ -6,88 +6,88 @@
 
 public class ServerSample
 {
-	public static void main(String[] argv)
-	throws Exception
-	{
-		// セレクタ�用�
-		Selector selector = Selector.open();
+public static void main(String[] argv)
+throws Exception
+{
+// セレクタ�用�
+Selector selector = Selector.open();
 
-		// サー�ソケット�ャン�ルを作�。5100番�ートを�付�ート�指定
-		// （�ブロックモード�設定：��）
-		ServerSocketChannel serverSocketChannel = ServerSocketChannel.open();
-		serverSocketChannel.configureBlocking(false);
-		serverSocketChannel.socket().bind(new InetSocketAddress(5100));
+// サー�ソケット�ャン�ルを作�。5100番�ートを�付�ート�指定
+// （�ブロックモード�設定：��）
+ServerSocketChannel serverSocketChannel = ServerSocketChannel.open();
+serverSocketChannel.configureBlocking(false);
+serverSocketChannel.socket().bind(new InetSocketAddress(5100));
 
-		// セレクタ�サー�ソケット�ャン�ルを登録。サー����付を監視
-		serverSocketChannel.register(selector, SelectionKey.OP_ACCEPT);
+// セレクタ�サー�ソケット�ャン�ルを登録。サー����付を監視
+serverSocketChannel.register(selector, SelectionKey.OP_ACCEPT);
 
-		// セレクタ�イベント�通知�れる���処�
-		while (true) {
+// セレクタ�イベント�通知�れる���処�
+while (true) {
 
-			// セレクタ�イベント�発生�る��ブロック
-			selector.select();
+// セレクタ�イベント�発生�る��ブロック
+selector.select();
 
-			// �得��イベント���処�を実行
-			for (SelectionKey selectionKey : selector.selectedKeys()) {
+// �得��イベント���処�を実行
+for (SelectionKey selectionKey : selector.selectedKeys()) {
 
-				// サー���付処�: 
-				// イベント��付�能��る場����付�る��対象��れ�
-				// セレクタ��得��ソケット�ャン�ルを登録
-				if (selectionKey.isAcceptable()) {
+// サー���付処�: 
+// イベント��付�能��る場����付�る��対象��れ�
+// セレクタ��得��ソケット�ャン�ルを登録
+if (selectionKey.isAcceptable()) {
 
-					// サー�ソケット�ャン�ル�らソケット�ャン�ルを�得
-					// ソケット�ャン�ルを経由��クライアント�通信��る
-					SocketChannel socketChannel = serverSocketChannel.accept();
+// サー�ソケット�ャン�ル�らソケット�ャン�ルを�得
+// ソケット�ャン�ルを経由��クライアント�通信��る
+SocketChannel socketChannel = serverSocketChannel.accept();
 
-					// 接続先����も���処��飛�����る。対象�
-					// null�場��処�を抜�る
-					if (null == socketChannel) continue;
+// 接続先����も���処��飛�����る。対象�
+// null�場��処�を抜�る
+if (null == socketChannel) continue;
 
-					// ソケット�ャン�ルを�ブロックモード�設定（��）��
-					// セレクタ�読�込�を対象���登録
-					socketChannel.configureBlocking(false);
-					socketChannel.register(selector, SelectionKey.OP_READ);
-					socketChannel = null;
-				}
+// ソケット�ャン�ルを�ブロックモード�設定（��）��
+// セレクタ�読�込�を対象���登録
+socketChannel.configureBlocking(false);
+socketChannel.register(selector, SelectionKey.OP_READ);
+socketChannel = null;
+}
 
-				// クライアント��通信処�
-				// 読込��能��る場��内容物を読��ん�標準出力�表示。
-				// メッセージをクライアント��信���コ�クションを切断。
-				// セレクタ�ら登録を解除
-				else if (selectionKey.isReadable()) {
+// クライアント��通信処�
+// 読込��能��る場��内容物を読��ん�標準出力�表示。
+// メッセージをクライアント��信���コ�クションを切断。
+// セレクタ�ら登録を解除
+else if (selectionKey.isReadable()) {
 
-					// 登録�れ��るソケット�ャン�ルを�得
-					SocketChannel socketChannel = 
-						(SocketChannel)selectionKey.channel();
+// 登録�れ��るソケット�ャン�ルを�得
+SocketChannel socketChannel = 
+(SocketChannel)selectionKey.channel();
 
-					Charset charset = Charset.forName("US-ASCII");
-					ByteBuffer byteBuffer = ByteBuffer.allocate(8192);
+Charset charset = Charset.forName("US-ASCII");
+ByteBuffer byteBuffer = ByteBuffer.allocate(8192);
 
-					// クライアント�らメッセージ��信
-					switch (socketChannel.read(byteBuffer)) {
-					case -1:
-						// クライアント��接続を切断����場���サー�も
-						// 接続を切断。セレクタ�ら登録を削除
-						socketChannel.close();
-						break;
-					case 0:
-						// 読�込む��メッセージ�届�������処�を飛��
-						continue;
-					default:
-						// クライアント�らメッセージを�得��標準出力�
-						byteBuffer.flip();
-					System.out.print("EEE: " + charset.decode(byteBuffer));
+// クライアント�らメッセージ��信
+switch (socketChannel.read(byteBuffer)) {
+case -1:
+// クライアント��接続を切断����場���サー�も
+// 接続を切断。セレクタ�ら登録を削除
+socketChannel.close();
+break;
+case 0:
+// 読�込む��メッセージ�届�������処�を飛��
+continue;
+default:
+// クライアント�らメッセージを�得��標準出力�
+byteBuffer.flip();
+System.out.print("EEE: " + charset.decode(byteBuffer));
 
-					// クライアント�メッセージを�信
-					socketChannel.write(charset.encode("Good bye!\r\n"));
+// クライアント�メッセージを�信
+socketChannel.write(charset.encode("Good bye!\r\n"));
 
-					// クライアント��接続を切断。セレクタ�ら登録を削除
-					//socketChannel.close();
-					break;
-					}
-				}
-				System.out.println(selectionKey.toString());
-			}
-		}
-	}
+// クライアント��接続を切断。セレクタ�ら登録を削除
+//socketChannel.close();
+break;
+}
+}
+System.out.println(selectionKey.toString());
+}
+}
+}
 }
\ No newline at end of file

--- a/rep/SessionList.java	Tue Aug 26 09:52:08 2008 +0900
+++ b/rep/SessionList.java	Tue Aug 26 16:33:47 2008 +0900
@@ -16,6 +16,7 @@
 	private boolean channelequals = false;
 	private LinkedList<Session> tmpSessionList = new LinkedList<Session>();
 	private String maxHost;
+	private LinkedList<Integer> temp = new LinkedList<Integer>();
 	
 	//private TranslaterImp1 translater;
 	
@@ -51,9 +52,9 @@
 
 	public void addEditor(SocketChannel channel, int sid, REPCommand repCmd) {
 		int editorID = repCmd.eid;
-//		if(session3.get(sid) == null) System.out.println("‚Ê‚é‚Û�I");
+//		if(session3.get(sid) == null) System.out.println("�る��");
 //		session3.get(sid).addEditor(editorID, channel);
-		sessionLinkedList.get(sid-1).addEditor(editorID, channel);		//–{“–‚Íforƒ‹�[ƒv‚ÅŒŸ�õ‚µ‚È‚¢‚Æ‚¢‚¯‚È‚¢‚æ�B
+		sessionLinkedList.get(sid-1).addEditor(editorID, channel);		//本当�forループ�検索��������よ。
 	}
 
 //	public int getSessionID(SocketChannel channel) {
@@ -67,7 +68,7 @@
 	
 	public void sendCmd(SocketChannel channel2, REPCommand repCmd) {
 //		LinkedList <Editor> editorList = session3.get(repCmd.sid).getEditorList();
-		LinkedList <Editor> editorList = sessionLinkedList.get(repCmd.sid).getEditorList();	//‚±‚±‚àforƒ‹�[ƒv‚ÅŒŸ�õ‚µ‚È‚¢‚Æ‚¢‚¯‚È‚¢‚æ�B
+		LinkedList <Editor> editorList = sessionLinkedList.get(repCmd.sid).getEditorList();	//��もforループ�検索��������よ。
 		for(Editor editor : editorList){
 			SocketChannel channel = editor.getChannel();
 			if(channel.equals(channel2)) {
@@ -81,7 +82,7 @@
 	
 	public void sendCmd(SocketChannel channel, REPCommand repCmd, boolean ring){
 //		LinkedList <Editor> editorList = session3.get(repCmd.sid).getEditorList();
-		LinkedList <Editor> editorList = sessionLinkedList.get(repCmd.sid).getEditorList();	//‚±‚±‚àforƒ‹�[ƒv‚ÅŒŸ�õ‚µ‚È‚¢‚Æ‚¢‚¯‚È‚¢‚æ�B
+		LinkedList <Editor> editorList = sessionLinkedList.get(repCmd.sid).getEditorList();	//��もforループ�検索��������よ。
 		REPPacketSend repsend = null;
 		for(Editor editor : editorList){
 			SocketChannel channel2 = editor.getChannel();
@@ -122,7 +123,7 @@
 		Editor editor3;
 //		LinkedList <Editor> editorList = session3.get(repCmd.sid).getEditorList();
 //		this.getSession(sid);
-		LinkedList <Editor> editorList = sessionLinkedList.get(repCmd.sid-1).getEditorList();	//‚±‚±‚àforƒ‹�[ƒv‚ÅŒŸ�õ‚µ‚È‚¢‚Æ‚¢‚¯‚È‚¢‚æ�B
+		LinkedList <Editor> editorList = sessionLinkedList.get(repCmd.sid-1).getEditorList();	//��もforループ�検索��������よ。
 		for(Editor editor : editorList){
 			SocketChannel channel2 = editor.getChannel();
 			if(channel.equals(channel2)){
@@ -139,12 +140,35 @@
 			editor3 = editorList.get(editorList.indexOf(editor2)+1);
 		}
 		if(editor3 != null){
+			//temp.add(repCmd.cmd);
+			REPCommand getUndoCommand = new REPCommand();
+			getUndoCommand.setCMD(REP.SMCMD_GET_UNDO);
+			getUndoCommand.lineno = repCmd.lineno;
+			editor3.send(getUndoCommand);
+			editor3.setKindOfUndoCmd(reverseCmd(repCmd.cmd));
 			editor3.send(repCmd);
 			//REPPacketSend send = new REPPacketSend(editor3.getChannel());
 			//send.send(repCmd);
 		}
 	}
 
+	private int reverseCmd(int cmd) {
+		// TODO Auto-generated method stub
+		int kindOfCmd = 0;
+		switch(cmd){
+		case REP.REPCMD_INSERT:
+			kindOfCmd = REP.REPCMD_DELETE;
+			break;
+		case REP.REPCMD_DELETE:
+			kindOfCmd = REP.REPCMD_INSERT;
+			break;
+		case REP.REPCMD_REPLACE:
+			kindOfCmd = REP.REPCMD_REPLACE;
+			break;
+		}
+		return kindOfCmd;
+	}
+
 	public void addEditor(SocketChannel editorChannel, int sid, int eid) {
 //		session3.get(sid).addEditor(eid, editorChannel);
 		sessionLinkedList.get(sid-1).addEditor(eid, editorChannel);
@@ -162,7 +186,7 @@
 	}
 
 //	public String getXML() {
-///* SessionList‚ðXML‚É�‘‚«�o‚·�B‚Æ‚«‚ÌŒ`Ž®
+///* SessionListをXML�書�出�。���形�
 // * 	<Session>
 // * 		<editor>
 // * 			<sid/>

--- a/rep/SessionManager.java	Tue Aug 26 09:52:08 2008 +0900
+++ b/rep/SessionManager.java	Tue Aug 26 16:33:47 2008 +0900
@@ -26,8 +26,8 @@
 //o-------header section (network order)-------------o
 /*int cmd;	// command
 int sid;	// session ID : uniqu to editing file
-int eid;	// editor ID : owner editor ID = 1�BSession ‚ɑ΂µ‚ă†ƒj�[ƒN
-int seqno;	// Sequence number : sequence number ‚̓GƒfƒBƒ^‚²‚Æ‚ÉŠÇ—�
+int eid;	// editor ID : owner editor ID = 1。Session �対��ユニーク
+int seqno;	// Sequence number : sequence number �エディタ���管�
 int lineno;	// line number
 int textsize;   // textsize : bytesize
 byte[] text;*/
@@ -42,7 +42,7 @@
 	private SessionManagerList smList;
 	private String myHost;
 	private boolean isMaster = true;
-	private EditorList  allEditorList;
+	private EditorList  ownEditorList;
 	private String maxHost;
 	//private boolean addressIsGlobal;
 	//private SocketChannel sessionchannel;
@@ -63,7 +63,7 @@
 	public void sessionManagerNet(int port) throws InterruptedException, IOException {
 	
 		ServerSocketChannel ssc = ServerSocketChannel.open();
-		ssc.configureBlocking(false);	//reuse address •K�{
+		ssc.configureBlocking(false);	//reuse address å¿…é ˆ
 		
 		ssc.socket().setReuseAddress(true);
 		
@@ -73,20 +73,20 @@
 		
 		sessionlist = new SessionList();
 		smList = new SessionManagerList();
-		allEditorList = new EditorList();
+		ownEditorList = new EditorList();
 		
 		while(true){
 			selector.select();
 			for(SelectionKey key : selector.selectedKeys()){
 				if(key.isAcceptable()){
-					/*** serverChannel‚Íenable‚É‚È‚Á‚½SelectionKey‚Ìchannel ***/
+					/*** serverChannel�enable����SelectionKey�channel ***/
 					ServerSocketChannel serverChannel = (ServerSocketChannel)key.channel();
-					/*** EditorChannel ‚ð—p‚¢‚È‚¢‹L�q ***/
-					SocketChannel channel = serverChannel.accept();	//key‚©‚çchannel‚ðŽæ‚Á‚Ä�Aaccept 
+					/*** EditorChannel を用���記述 ***/
+					SocketChannel channel = serverChannel.accept();	//key�らchannelを����accept 
 					registerChannel (selector, channel, SelectionKey.OP_READ);
 					channel = null;
 					
-					/*** EditorChannel ‚ð—p‚¢‚½‹L�q ****/
+					/*** EditorChannel を用��記述 ****/
 					//EditorChannel echannel = (EditorChannel) ssc.accept();
 					//echannel.setIO();
 					//registerChannel(selector, echannel, SelectionKey.OP_READ);
@@ -101,15 +101,15 @@
 					
 				}else if(key.isReadable()){
 					
-					/*** EditorChannel ‚ð—p‚¢‚È‚¢‹L�q ***/
+					/*** EditorChannel を用���記述 ***/
 					SocketChannel channel = (SocketChannel)key.channel();
-					REPPacketReceive receive = new REPPacketReceive(channel); //getPacket(), putPacket() ‚É‚·‚é�B
+					REPPacketReceive receive = new REPPacketReceive(channel); //getPacket(), putPacket() ��る。
 					receive.setkey(key);
 					REPCommand receivedCommand = receive.unpackUConv();
 					//REPCommand receivedCommand = receive.unpack();
 					manager(channel, receivedCommand);
 					
-					/*** EditorChannel ‚ð—p‚¢‚½‹L�q ****/
+					/*** EditorChannel を用��記述 ****/
 					//EditorChannel echannel = (EditorChannel) key.channel();
 					//REPCommand command = echannel.getPacket();
 					//manager(echannel, command);
@@ -144,7 +144,7 @@
 		case REP.SMCMD_JOIN:
 			editor = new Editor(channel);
 			editor.setHost(myHost);
-			int tempeid = allEditorList.addEditor(editor);
+			int tempeid = ownEditorList.addEditor(editor);
 			gui.setComboEditor(tempeid, channel);
 			
 			break;
@@ -158,7 +158,7 @@
 		case REP.SMCMD_PUT:
 			editor = new Editor(channel);
 			editor.setHost(myHost);
-			allEditorList.addEditor(editor);
+			ownEditorList.addEditor(editor);
 			editor.setEID(1);
 			//String string2 = setUTF16(receivedCommand.string);
 			editor.setName(receivedCommand.string);
@@ -198,7 +198,7 @@
 //			break;
 			
 		case REP.SMCMD_SELECT:
-//			sessionlist.addEditor(channel, repCmd.sid, repCmd);	//sessionlist‚֒ljÁ
+//			sessionlist.addEditor(channel, repCmd.sid, repCmd);	//sessionlist�追加
 			editor = new Editor(channel);
 			
 			session = sessionlist.getSession(receivedCommand.sid);
@@ -223,7 +223,7 @@
 		case REP.SMCMD_SELECT_ACK:
 			
 			String hostport = receivedCommand.string;
-			Editor editor2 = allEditorList.getEditor(hostport);
+			Editor editor2 = ownEditorList.getEditor(hostport);
 			if(editor2 != null) {
 				REPCommand command2 = new REPCommand();
 				command2.setCMD(REP.SMCMD_JOIN_ACK);
@@ -245,20 +245,20 @@
 			
 		case REP.SMCMD_SM_JOIN:
 			
-			//SessionManager‚̃ŠƒXƒg‚֒ljÁ
+			//SessionManager�リスト�追加
 			smList.add(channel);
 			
-			//XML‚©‚çSessionListƒIƒuƒWƒFƒNƒg‚ð�¶�¬‚·‚é�B
+			//XML�らSessionListオブジェクトを生��る。
 			SessionXMLDecoder decoder = new SessionXMLDecoder();
 			SessionList receivedSessionList = decoder.decode(receivedCommand.string);
 			
-			//SessionList‚֒ljÁ‚µ•ÏŠ·ƒe�[ƒuƒ‹‚ð�¶�¬‚·‚é�B
+			//SessionList�追加�変�テーブルを生��る。
 			sessionlist.update(channel, receivedSessionList);
 			
-			//myHost ‚ð�Ý’è�B
+			//myHost を設定。
 			if(myHost == null) setMyHostName(getLocalHostName(channel));
 			
-			//maxHost ‚ð�Ý’è�B
+			//maxHost を設定。
 			if(setMaxHost(channel, receivedSessionList.getMaxHost())){
 				sendCommand = new REPCommand();
 				sendCommand.setCMD(REP.SMCMD_CH_MASTER);
@@ -266,21 +266,21 @@
 				smList.sendExcept(channel, sendCommand);
 			}
 			
-			//SessionList‚©‚çXML‚ð�¶�¬�B
-			//join‚µ‚Ä‚«‚½SessionManager‚ɑ΂µ‚ÄACK‚ð‘—�M�B
+			//SessionList�らXMLを生�。
+			//join����SessionManager�対��ACKを�信。
 			SessionXMLEncoder sessionlistEncoder = new SessionXMLEncoder(sessionlist);
 			sendCommand = new REPCommand();
 			sendCommand.setCMD(REP.SMCMD_SM_JOIN_ACK);
 			sendCommand.setString(sessionlistEncoder.sessionListToXML());
 			send.send(sendCommand);
 			
-			//‚»‚Ì‘¼‚Ì SessionManager ‚ɑ΂µ‚Ä SMCMD_UPDATE‚ð ‘—�M�B
+			//��他� SessionManager �対�� SMCMD_UPDATEを �信。
 			sendCommand = new REPCommand();
 			sendCommand.setCMD(REP.SMCMD_UPDATE);
 			sendCommand.setString(receivedCommand.string);
 			smList.sendExcept(channel, sendCommand);
 			
-			//‚»‚Ì‘¼‚ÌSessionManager‚ɑ΂µ‚ÄSMCMD_SM_JOIN‚ð‘—�M�B
+			//��他�SessionManager�対��SMCMD_SM_JOINを�信。
 			//sendCommand = new REPCommand();
 			//sendCommand.setCMD(REP.SMCMD_SM_JOIN);
 			//sendCommand.setString(receivedCommand.string);
@@ -294,11 +294,11 @@
 			
 		case REP.SMCMD_SM_JOIN_ACK:
 			
-			//XML‚©‚çSessionListƒIƒuƒWƒFƒNƒg‚ð�¶�¬�B
+			//XML�らSessionListオブジェクトを生�。
 			SessionXMLDecoder decoder2 = new SessionXMLDecoder();
 			SessionList receivedSessionList2 = decoder2.decode(receivedCommand.string);
 			
-			//maxHost‚ðŒˆ’è�B
+			//maxHostを決定。
 			if(setMaxHost(channel, receivedSessionList2.getMaxHost())){
 				sendCommand = new REPCommand();
 				sendCommand.setCMD(REP.SMCMD_CH_MASTER);
@@ -317,7 +317,7 @@
 			SessionXMLDecoder decoder3 = new SessionXMLDecoder();
 			SessionList receivedSessionList3 = decoder3.decode(receivedCommand.string);
 			
-			//SessionList‚֒ljÁ‚µ•ÏŠ·ƒe�[ƒuƒ‹‚ð�¶�¬‚·‚é�B
+			//SessionList�追加�変�テーブルを生��る。
 			sessionlist.update(channel, receivedSessionList3);
 			
 			smList.sendExcept(channel, receivedCommand);
@@ -326,7 +326,7 @@
 				gui.setComboSession(session3.getSID(), session3.getName());
 			}
 			
-			//Session‚Ìowner‚ÌEditor
+			//Session�owner�Editor
 			//editor = new Editor(channel);
 			//editor.setName(receivedCommand.string);
 			
@@ -368,7 +368,7 @@
 //			break;
 			
 		case REP.SMCMD_CH_MASTER:
-			//maxHost ‚ð�Ý’è�B
+			//maxHost を設定。
 			if(setMaxHost(channel, receivedCommand.string)){
 				sendCommand = new REPCommand();
 				sendCommand.setCMD(REP.SMCMD_CH_MASTER);
@@ -377,13 +377,44 @@
 			}
 			break;
 			
+		case REP.SMCMD_GET_UNDO_ACK:
+			editor = ownEditorList.getEditor(channel);
+			editor.addUndoCommand(receivedCommand);
+			break;
+			
 		default:
 			//sessionlist.sendCmd(channel, repCmd);
+			editor = ownEditorList.getEditor(channel);
+			if(receivedCommand.seq < 0){
+				//editor = ownEditorList.getEditor(channel);
+				if(editor != null) {
+					editor.addUndoCommand(receivedCommand);
+				}
+				break;
+			}
+			//editor.setKindOfUndoCmd(reverseCmd(receivedCommand.cmd));
 			sessionlist.sendToNextEditor(channel, receivedCommand);
 			break;
 		}
 	}
 
+	private int reverseCmd(int cmd) {
+		// TODO Auto-generated method stub
+		int kindOfCmd = 0;
+		switch(cmd){
+		case REP.REPCMD_INSERT:
+			kindOfCmd = REP.REPCMD_DELETE;
+			break;
+		case REP.REPCMD_DELETE:
+			kindOfCmd = REP.REPCMD_INSERT;
+			break;
+		case REP.REPCMD_REPLACE:
+			kindOfCmd = REP.REPCMD_REPLACE;
+			break;
+		}
+		return kindOfCmd;
+	}
+
 	private String setUTF16(String string) {
     	//CharBuffer cb = CharBuffer.wrap(string);
    		Charset charset = Charset.forName("UTF-16");
@@ -409,8 +440,8 @@
 			sessionlist.setMaxHost(maxHost);
 		}
 		if(host.compareTo(maxHost) > 0){
-			//host > MaxHost ‚È‚ç maxHost = host
-			//master‚ð�Ý’è‚·‚é�B
+			//host > MaxHost �ら maxHost = host
+			//masterを設定�る。
 			maxHost = host;
 			sessionlist.setMaxHost(maxHost);
 			setMaster(false, channel);
@@ -426,7 +457,7 @@
 			maxHost = myHost;
 			sessionlist.setMaxHost(maxHost);
 		}
-		allEditorList.setHost(myHost);
+		ownEditorList.setHost(myHost);
 	}
 
 	private void setMaster(boolean b, SocketChannel channel) {
@@ -482,23 +513,23 @@
 	
 	private void sm_join(SocketChannel channel){
 		
-		//SM_JOINƒRƒ}ƒ“ƒh‚ð�¶�¬�B
+		//SM_JOINコマンドを生�。
 		REPCommand command = new REPCommand();
 		command.setCMD(REP.SMCMD_SM_JOIN);
 		
-		//hostname‚ðƒZƒbƒg�B
+		//hostnameをセット。
 		setMyHostName(getLocalHostName(channel));
 		
-		//XML‚ð�¶�¬�B‘—�MƒRƒ}ƒ“ƒh‚ɃZƒbƒg�B
+		//XMLを生�。�信コマンド�セット。
 		SessionXMLEncoder encoder = new SessionXMLEncoder(sessionlist);
 		String string = encoder.sessionListToXML();
 		command.setString(string);
 		
-		//SM_JOINƒRƒ}ƒ“ƒh‚ð‘—�M�B
+		//SM_JOINコマンドを�信。
 		REPPacketSend send = new REPPacketSend(channel);
 		send.send(command);
 		
-		//SessionManager‚ÌList‚ɒljÁ�B
+		//SessionManager�List�追加。
 		smList.add(channel);
 	}
 
@@ -526,7 +557,7 @@
 
 	public void ActionOccured(REPActionEvent event) {
 		
-		/*** Œ³‚Ì ***/
+		/*** 元� ***/
 //		SocketChannel editorChannel = event.getEditorChannel();
 //		int sid = event.getSID();
 //		Editor editor = new Editor(editorChannel);
@@ -542,7 +573,7 @@
 //		command.setString(editor.getHost() + ":" + editor.getPort());
 //		owner.send(command);
 		
-		/*** �‘‚«’¼‚µ ***/
+		/*** 書�直� ***/
 		SocketChannel channel = event.getEditorChannel();
 		int sid = event.getSID();
 		Session session = sessionlist.getSession(sid);
@@ -579,4 +610,10 @@
 		
 		//sessionlist.sendSelect(sid);
 	}
+
+	public void undo() {
+		// TODO Auto-generated method stub
+		ownEditorList.undoAllEditors();
+		System.out.println("Undo!");
+	}
 }

--- a/rep/SessionManagerGUI.java	Tue Aug 26 09:52:08 2008 +0900
+++ b/rep/SessionManagerGUI.java	Tue Aug 26 16:33:47 2008 +0900
@@ -58,7 +58,7 @@
 
 	public void addREPActionListener(REPActionListener listener) {
 		// TODO Auto-generated method stub
-		rp.REPActionListener(listener);
+		rp.addREPActionListener(listener);
 	}
 
 	public void setComboSession(int sessionID, String string) {
@@ -66,4 +66,5 @@
 		rp.setComboSession(sessionID, string);
 		rp.setTableSession(sessionID, string);
 	}
+
 }
\ No newline at end of file

--- a/rep/xml/SessionXMLEncoder.java	Tue Aug 26 09:52:08 2008 +0900
+++ b/rep/xml/SessionXMLEncoder.java	Tue Aug 26 16:33:47 2008 +0900
@@ -38,7 +38,7 @@
 	}
 
 	public String sessionListToXML() {
-		/* SessionList‚ðXML‚É�‘‚«�o‚·�B‚Æ‚«‚ÌŒ`Ž®
+		/* SessionListをXML�書�出�。���形�
 		 * 	<Session>
 		 * 		<editor>
 		 * 			<sid> 1 </sid>

--- a/test/TestUTF8.java	Tue Aug 26 09:52:08 2008 +0900
+++ b/test/TestUTF8.java	Tue Aug 26 16:33:47 2008 +0900
@@ -100,7 +100,7 @@
 	}
 	
 	public static void main(String[] args) throws IOException{
-		String text = "‚ ‚¢‚¤‚¦‚¨�A‚©‚«‚­‚¯‚±�A‚³‚µ‚·‚¹‚»";
+		String text = "�����������������";
 		REP rep;
 		REPCommand utf8buf = new REPCommand(1, 2, 3, 4, 5, 0, text);
 		REPCommand buf = new REPCommand(1, 2, 3, 4, 5, 0, text);

--- a/test/XMLTest.java	Tue Aug 26 09:52:08 2008 +0900
+++ b/test/XMLTest.java	Tue Aug 26 16:33:47 2008 +0900
@@ -29,16 +29,16 @@
 		sessionlist.setMaxHost("naha.ie.u-ryukyu.ac.jp");
 		sessionlist.addSession(session);
 		
-		/*** SessionList ‚©‚ç XML ‚Ö ***/
+		/*** SessionList �ら XML � ***/
 		//SessionXMLEncoder encoder = new SessionXMLEncoder(sessionlist.getList());
 		SessionXMLEncoder encoder = new SessionXMLEncoder(sessionlist);
 		System.out.println(encoder.sessionListToXML());
 		
-		/*** XML ‚©‚ç SessionList ‚Ö ***/
+		/*** XML �ら SessionList � ***/
 		SessionXMLDecoder decoder = new SessionXMLDecoder();
 		SessionList sessionlist2 = decoder.decode(encoder.sessionListToXML());
 		
-		/*** SessionList ‚©‚ç XML ‚Ö ***/
+		/*** SessionList �ら XML � ***/
 		//SessionXMLEncoder encoder2 = new SessionXMLEncoder(sessionlist2.getList());
 		SessionXMLEncoder encoder2 = new SessionXMLEncoder(sessionlist2);
 		System.out.println(encoder2.sessionListToXML());