/**
* Parse a properties sub-packet. If any errors occur while de-serializing Java object properties,
* an exception will be printed and not thrown since a thrown exception will shut down the entire
* connection. ClassCastExceptions will occur when both the sender and receiver of the packet
* don't have identical versions of the same class.
*
* @param parser the XML parser, positioned at the start of a properties sub-packet.
* @return a map of the properties.
* @throws Exception if an error occurs while parsing the properties.
*/
public static Map<String, Object> parseProperties(XmlPullParser parser) throws Exception {
Map<String, Object> properties = new HashMap<String, Object>();
while (true) {
int eventType = parser.next();
if (eventType == XmlPullParser.START_TAG && parser.getName().equals("property")) {
// Parse a property
boolean done = false;
String name = null;
String type = null;
String valueText = null;
Object value = null;
while (!done) {
eventType = parser.next();
if (eventType == XmlPullParser.START_TAG) {
String elementName = parser.getName();
if (elementName.equals("name")) {
name = parser.nextText();
} else if (elementName.equals("value")) {
type = parser.getAttributeValue("", "type");
valueText = parser.nextText();
}
} else if (eventType == XmlPullParser.END_TAG) {
if (parser.getName().equals("property")) {
if ("integer".equals(type)) {
value = Integer.valueOf(valueText);
} else if ("long".equals(type)) {
value = Long.valueOf(valueText);
} else if ("float".equals(type)) {
value = Float.valueOf(valueText);
} else if ("double".equals(type)) {
value = Double.valueOf(valueText);
} else if ("boolean".equals(type)) {
value = Boolean.valueOf(valueText);
} else if ("string".equals(type)) {
value = valueText;
} else if ("java-object".equals(type)) {
try {
byte[] bytes = StringUtils.decodeBase64(valueText);
ObjectInputStream in = new ObjectInputStream(new ByteArrayInputStream(bytes));
value = in.readObject();
} catch (Exception e) {
LOGGER.log(Level.SEVERE, "", e);
}
}
if (name != null && value != null) {
properties.put(name, value);
}
done = true;
}
}
}
} else if (eventType == XmlPullParser.END_TAG) {
if (parser.getName().equals("properties")) {
break;
}
}
}
return properties;
}
/**
* Decodes a String into an object of the specified type. If the object type is not supported,
* null will be returned.
*
* @param type the type of the property.
* @param value the encode String value to decode.
* @return the String value decoded into the specified type.
* @throws Exception If decoding failed due to an error.
*/
private static Object decode(Class type, String value) throws Exception {
if (type.getName().equals("java.lang.String")) {
return value;
}
if (type.getName().equals("boolean")) {
return Boolean.valueOf(value);
}
if (type.getName().equals("int")) {
return Integer.valueOf(value);
}
if (type.getName().equals("long")) {
return Long.valueOf(value);
}
if (type.getName().equals("float")) {
return Float.valueOf(value);
}
if (type.getName().equals("double")) {
return Double.valueOf(value);
}
if (type.getName().equals("java.lang.Class")) {
return Class.forName(value);
}
return null;
}