Revert of Remove webrtc/libjingle/{xmllite,xmpp}

webrtc/libjingle/xmpp/receivetask.h

+/*
+ *  Copyright 2011 The WebRTC Project Authors. All rights reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef WEBRTC_LIBJINGLE_XMPP_RECEIVETASK_H_
+#define WEBRTC_LIBJINGLE_XMPP_RECEIVETASK_H_
+
+#include "webrtc/libjingle/xmpp/xmpptask.h"
+
+namespace buzz {
+
+// A base class for receiving stanzas.  Override WantsStanza to
+// indicate that a stanza should be received and ReceiveStanza to
+// process it.  Once started, ReceiveStanza will be called for all
+// stanzas that return true when passed to WantsStanza. This saves
+// you from having to remember how to setup the queueing and the task
+// states, etc.
+class ReceiveTask : public XmppTask {
+ public:
+  explicit ReceiveTask(XmppTaskParentInterface* parent) :
+      XmppTask(parent, XmppEngine::HL_TYPE) {}
+  virtual int ProcessStart();
+
+ protected:
+  virtual bool HandleStanza(const XmlElement* stanza);
+
+  // Return true if the stanza should be received.
+  virtual bool WantsStanza(const XmlElement* stanza) = 0;
+  // Process the received stanza.
+  virtual void ReceiveStanza(const XmlElement* stanza) = 0;
+};
+
+}  // namespace buzz
+
+#endif  // WEBRTC_LIBJINGLE_XMPP_RECEIVETASK_H_