/**
* This method applies default processing to received IQ stanzas. This
* method:
* <p/>
* <ul>
* <li>calls methods to process IQ requests (type <tt>get</tt> and
* <tt>set</tt>). If no response to these request are returned, this method
* will respond to the request with an IQ stanza of type <tt>error</tt>,
* containing an error condition <tt>feature-not-implemented</tt> (this
* behavior can be disabled by setting the <tt>enforceIQResult</tt> argument
* in the constructor to <tt>false</tt>);</li>
* <li>calls methods to process IQ results (type <tt>result</tt> and
* <tt>error</tt>). No response to these stanzas are expected;</li>
* <li>returns an IQ stanza of type error, condition 'internal-server-error'
* if the processing of an IQ request (type <tt>get</tt> or <tt>set</tt>)
* resulted in an Exception being thrown.</li>
* </ul>
* <p/>
* Note that if you want to add or adjust functionality, you should
* <strong>not</strong> override this method. Instead, you probably want to
* override any of these methods: {@link #handleIQGet()},
* {@link #handleIQSet()}, {@link #handleIQResult(IQ)},
* {@link #handleIQError(IQ)} {@link #handleDiscoInfo(IQ)} and/or
* {@link #handleDiscoItems(IQ)}
*
* @param iq
* The IQ stanza that was received by this component.
*/
private sealed void processIQ(IQ iq)
{
log.Debug("(serving component '{}') Processing IQ (packetId {}): {}",
new Object[] {getName(), iq.getID(), iq.toXML() });
IQ response = null;
Type type = iq.getType();
try {
switch (type) {
case get: // intended fall-through
case set:
// cache the id, to prevent the extending implementation from
// modifying it.
String requestID = iq.getID();
response = processIQRequest(iq);
// validate the response IQ stanza.
if (response == null) {
// A request (IQ type 'get' or 'set') MUST be responded to.
// If no response was generated, create an 'error' type
// response.
if (enforceIQResult) {
response = IQ.createResultIQ(iq);
response.setError(Condition.feature_not_implemented);
}
} else {
// responses MUST be of type 'result' or 'error'. Everything
// else is invalid.
if (!response.isResponse()) {
throw new IllegalStateException("Responses to IQ "
+ "of type <tt>get</tt> or <tt>set</tt> can "
+ "only be IQ stanza's of type <tt>error</tt> "
+ "or <tt>result</tt>. The response to this "
+ "packet was incorrect: " + iq.toXML()
+ ". The response was: " + response.toXML());
}
// responses must have the same packet ID as the request
if (!requestID.equals(response.getID())) {
throw new IllegalStateException("The response to "
+ "an request IQ must have the same packet "
+ "ID. If this was done intentionally, "
+ "#send(Packet) should have been used "
+ "instead. The response to this packet "
+ "was incorrect: " + iq.toXML()
+ ". The response was: " + response.toXML());
}
log.debug("(serving component '{}') Responding to IQ (packetId {}) with: {}", new Object[] { getName(), iq.getID(), response.toXML() });
}
break;
case result:
if (servesLocalUsersOnly() && !sentByLocalEntity(iq)) {
log.info("(serving component '{}') Dropping IQ "
+ "stanza sent by a user from another domain: {}",
getName(), iq.getFrom());
log.debug("(serving component '{}') Dropping IQ "
+ "stanza sent by a user from another domain: {}",
getName(), iq.toXML());
return;
}
handleIQResult(iq);
break;
case error:
if (servesLocalUsersOnly() && !sentByLocalEntity(iq)) {
log.info("(serving component '{}') Dropping IQ "
+ "stanza sent by a user from another domain: {}",
getName(), iq.getFrom());
log.debug("(serving component '{}') Dropping IQ "
+ "stanza sent by a user from another domain: {}",
getName(), iq.toXML());
return;
}
handleIQError(iq);
break;
}
} catch (Exception ex) {
log.warn("(serving component '" + getName()
+ "') Unexpected exception while processing IQ stanza: "
+ iq.toXML(), ex);
if (iq.isRequest()) {
// if the received IQ stanza was a 'get' or 'set' request,
// return an error, as some kind of response MUST be sent back
// to those stanzas.
response = IQ.createResultIQ(iq);
response.setError(Condition.internal_server_error);
}
}
// send the response, if there's any.
if (response != null) {
send(response);
}
}