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

webrtc/libjingle/xmpp/moduleimpl.cc

+/*
+ *  Copyright 2004 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.
+ */
+
+#include "webrtc/libjingle/xmpp/moduleimpl.h"
+#include "webrtc/base/common.h"
+
+namespace buzz {
+
+XmppModuleImpl::XmppModuleImpl() :
+  engine_(NULL),
+  stanza_handler_(this) {
+}
+
+XmppModuleImpl::~XmppModuleImpl()
+{
+  if (engine_ != NULL) {
+    engine_->RemoveStanzaHandler(&stanza_handler_);
+    engine_ = NULL;
+  }
+}
+
+XmppReturnStatus
+XmppModuleImpl::RegisterEngine(XmppEngine* engine)
+{
+  if (NULL == engine || NULL != engine_)
+    return XMPP_RETURN_BADARGUMENT;
+
+  engine->AddStanzaHandler(&stanza_handler_);
+  engine_ = engine;
+
+  return XMPP_RETURN_OK;
+}
+
+XmppEngine*
+XmppModuleImpl::engine() {
+  ASSERT(NULL != engine_);
+  return engine_;
+}
+
+}
+