--- a/rep/xml/SessionXMLDecoder.java	Mon Nov 10 22:18:14 2008 +0900
+++ b/rep/xml/SessionXMLDecoder.java	Mon Nov 10 22:19:34 2008 +0900
@@ -9,6 +9,8 @@
 
 import org.w3c.dom.Document;
 import org.w3c.dom.Element;
+import org.w3c.dom.NamedNodeMap;
+import org.w3c.dom.Node;
 import org.w3c.dom.NodeList;
 import org.xml.sax.InputSource;
 import org.xml.sax.SAXException;
@@ -22,15 +24,13 @@
 	DocumentBuilderFactory factory;
 	DocumentBuilder builder;
 
-	public SessionXMLDecoder(String string) throws SAXException, IOException {
-		decode(string);
-	}
 
 	public SessionXMLDecoder() {
 		factory = DocumentBuilderFactory.newInstance();
 		try {
-			factory.newDocumentBuilder();
+			builder = factory.newDocumentBuilder();
 		} catch (ParserConfigurationException e) {
+			assert false;
 		}
 	}
 
@@ -65,9 +65,9 @@
 		SessionList sessionlist = new SessionList();
 		NodeList nodelistSession = element.getElementsByTagName("Session");
 		for(int i = 0; i < nodelistSession.getLength(); i++){
-			Element elementSession = (Element) nodelistSession.item(i);
-			int sid = Integer.parseInt(elementSession.getAttribute("sid"));
-			NodeList nodelistEditor = elementSession.getElementsByTagName("Editor");
+			Node elementSession = nodelistSession.item(i);
+			int sid = getIntValue(elementSession,"sid");
+			NodeList nodelistEditor = ((Element)elementSession).getElementsByTagName("Editor");
 			
 			Session session = null;
 			for(int j = 0; j < nodelistEditor.getLength(); j++){
@@ -76,7 +76,8 @@
 				Element elementEditor = (Element) nodelistEditor.item(j);
 				NodeList nodelistEditorHost = elementEditor.getElementsByTagName("host");
 				Element elementHost = (Element) nodelistEditorHost.item(0); 
-				String host = elementHost.getFirstChild().getNodeValue();
+				Node hostValue = elementHost.getFirstChild();
+				String host = hostValue==null?"":hostValue.getNodeValue();
 				
 				if(elementEditor.getChildNodes().getLength() > 2){
 					NodeList nodelistEditorFile = elementEditor.getElementsByTagName("file");
@@ -100,5 +101,18 @@
 		}
 		return sessionlist;
 	}
+
+	private int getIntValue(Node elementSession, String attrName) {
+		NamedNodeMap attr = elementSession.getAttributes();
+		Node sidNode = attr.getNamedItem(attrName);
+		int sid = Integer.parseInt(sidNode.getNodeValue());
+		return sid;
+	}
+//	
+//	private String getString(Node elementSession, String attrName) {
+//		NamedNodeMap attr = elementSession.getAttributes();
+//		Node sidNode = attr.getNamedItem(attrName);
+//		return sidNode.getNodeValue();
+//	}
 	
 }