Protyping UIDL object

svn changeset:1606/svn branch:trunk

src/com/itmill/toolkit/terminal/gwt/client/Paintable.java

@@ -0,0 +1,8 @@
+package com.itmill.toolkit.terminal.gwt.client;
+
+import com.google.gwt.xml.client.Node;
+
+public interface Paintable {
+
+	public void updateFromUidl(UIDL uidl);
+}

src/com/itmill/toolkit/terminal/gwt/client/UIDL.java

@@ -0,0 +1,78 @@
+package com.itmill.toolkit.terminal.gwt.client;
+
+import java.util.Iterator;
+import java.util.Set;
+
+import com.google.gwt.json.client.JSONArray;
+import com.google.gwt.json.client.JSONObject;
+import com.google.gwt.json.client.JSONString;
+
+public class UIDL {
+
+	JSONObject json;
+	
+	public UIDL(JSONObject json) {
+		this.json = json;
+	}
+	
+	public int getId() {
+		String id = getAttribute("id");
+		if (id==null) return -1;
+		return Integer.parseInt(id);
+	}
+	
+	public String getTag() {
+		Set keys = json.keySet();
+		if (keys.size() != 1) 
+			throw new IllegalStateException("Expected JSON Object to contain exactly one key, now contains "+ json.keySet());
+		return "" + keys.iterator().next();
+	}
+	
+	public String getAttribute(String name) {
+		JSONObject attrs = (JSONObject) json.get("attr");
+		if (attrs == null) return null;
+		return ""+ attrs.get(name);
+	}
+	
+	public Iterator getChildIterator() {
+		
+		return new Iterator() {
+			
+			JSONArray children = (JSONArray) ((JSONObject)json.get(getTag())).get("children");
+			int index=0;
+		
+			public void remove() {
+				throw new UnsupportedOperationException();
+			}
+		
+			public Object next() {
+				
+				if (children != null)
+					return new UIDL((JSONObject)children.get(index++));
+				return null;
+			}
+		
+			public boolean hasNext() {
+				return children != null && children.size() > index;
+			}
+		
+		};
+	}
+	
+	public String toString() {
+		String s = "<"+getTag()+ " ";
+		
+		s +="id="+getId();
+		s += ">\n";
+
+		Iterator i = getChildIterator();
+		while (i.hasNext()) {
+			UIDL c = (UIDL) i.next();
+			s += c.toString();
+		}
+
+		s += "</"+getTag()+">\n";
+		
+		return s;
+	}
+}