print data object as json

src/main/java/de/hottis/smarthomelib/ADataObject.java

@@ -41,13 +41,40 @@ public abstract class ADataObject implements Serializable {
 	
 	public String toString() {
 		StringBuffer sb = new StringBuffer();
-		sb.append("<");
+                sb.append("{\"name\":\"");
+                sb.append(name);
+                sb.append("\", \"ts\":\"");
+                sb.append(timestamp);
+                sb.append("Z\", \"values\":{");
+                boolean first = true;
+                for (Map.Entry<String, Object> entry : values.entrySet()) {
+                    if (! first) {
+                        sb.append(", ");
+                    } else {
+                        first = false;
+                    }
+                    sb.append("\"");
+                    sb.append(entry.getKey());
+                    sb.append("\":");
+                    Object value = entry.getValue();
+                    if (! (value instanceof Double)) {
+                        sb.append("\"");
+                    }
+                    sb.append(value);
+                    if (! (value instanceof Double)) {
+                        sb.append("\"");
+                    }
+                }
+                sb.append("}}");
+/*
+                sb.append("<");
 		sb.append(name);
 		sb.append(", ");
 		sb.append(timestamp);
 		sb.append(", ");
 		sb.append(values.toString());
 		sb.append(">");
+*/                
         return sb.toString();
 	}
 }