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

webrtc/libjingle/xmpp/discoitemsquerytask.cc

Index: webrtc/libjingle/xmpp/discoitemsquerytask.cc
diff --git a/webrtc/libjingle/xmpp/discoitemsquerytask.cc b/webrtc/libjingle/xmpp/discoitemsquerytask.cc
new file mode 100644
index 0000000000000000000000000000000000000000..10f6e1d74522bce49ab5ab16325bf15a33cf4db2
--- /dev/null
+++ b/webrtc/libjingle/xmpp/discoitemsquerytask.cc
@@ -0,0 +1,61 @@
+/*
+ *  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/constants.h"
+#include "webrtc/libjingle/xmpp/discoitemsquerytask.h"
+#include "webrtc/libjingle/xmpp/xmpptask.h"
+
+namespace buzz {
+
+DiscoItemsQueryTask::DiscoItemsQueryTask(XmppTaskParentInterface* parent,
+                                         const Jid& to,
+                                         const std::string& node)
+    : IqTask(parent, STR_GET, to, MakeRequest(node)) {
+}
+
+XmlElement* DiscoItemsQueryTask::MakeRequest(const std::string& node) {
+  XmlElement* element = new XmlElement(QN_DISCO_ITEMS_QUERY, true);
+  if (!node.empty()) {
+    element->AddAttr(QN_NODE, node);
+  }
+  return element;
+}
+
+void DiscoItemsQueryTask::HandleResult(const XmlElement* stanza) {
+  const XmlElement* query = stanza->FirstNamed(QN_DISCO_ITEMS_QUERY);
+  if (query) {
+    std::vector<DiscoItem> items;
+    for (const buzz::XmlChild* child = query->FirstChild(); child;
+         child = child->NextChild()) {
+      DiscoItem item;
+      const buzz::XmlElement* child_element = child->AsElement();
+      if (ParseItem(child_element, &item)) {
+        items.push_back(item);
+      }
+    }
+    SignalResult(items);
+  } else {
+    SignalError(this, NULL);
+  }
+}
+
+bool DiscoItemsQueryTask::ParseItem(const XmlElement* element,
+                                    DiscoItem* item) {
+  if (element->HasAttr(QN_JID)) {
+    return false;
+  }
+
+  item->jid = element->Attr(QN_JID);
+  item->name = element->Attr(QN_NAME);
+  item->node = element->Attr(QN_NODE);
+  return true;
+}
+
+}  // namespace buzz