/**
* Adds the element contained in the PacketExtension to the child element of the IQ
* packet. IQ packets, unlike the other packet types, have a unique child element that
* holds the packet extensions. If an extension is added to an IQ packet that does
* not have a child element then an IllegalStateException will be thrown.<p>
*
* It is important that this is the first and last time the element contained in
* PacketExtension is added to another Packet. Otherwise, a runtime error will be
* thrown when trying to add the PacketExtension's element to the Packet's element.
* Future modifications to the PacketExtension will be reflected in this Packet.<p>
*
* Note: packet extensions on IQ packets are only for use in specialized situations.
* In most cases, you should only need to set the child element of the IQ.
*
* @param extension the PacketExtension whose element will be added to this Packet's element.
*/
public void addExtension(PacketExtension extension) {
XElement childElement = getChildElement();
if (childElement == null) {
throw new IllegalStateException("Cannot add packet extension when child element is null");
}
// Add the extension to the child element
childElement.Add(extension.getElement());
}
/**
* Adds the element contained in the PacketExtension to the element of this packet.
* It is important that this is the first and last time the element contained in
* PacketExtension is added to another Packet. Otherwise, a runtime error will be
* thrown when trying to add the PacketExtension's element to the Packet's element.
* Future modifications to the PacketExtension will be reflected in this Packet.
*
* @param extension the PacketExtension whose element will be added to this Packet's element.
*/
public void addExtension(PacketExtension extension) {
element.Add(extension.getElement());
}