ndn.cxx: Initial work to introduce full NDN application API to ndnSIM

Refs #1005 (http://redmine.named-data.net/)
diff --git a/examples/custom-apps/ndn-api-app.cc b/examples/custom-apps/ndn-api-app.cc
new file mode 100644
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--- /dev/null
+++ b/examples/custom-apps/ndn-api-app.cc
@@ -0,0 +1,70 @@
+/* -*-  Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil; -*- */
+/*
+ * Copyright (c) 2013 University of California, Los Angeles
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation;
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ * Author: Alexander Afanasyev <alexander.afanasyev@ucla.edu>
+ */
+
+#include "ndn-api-app.h"
+
+NS_LOG_COMPONENT_DEFINE ("ndn.ApiApp");
+
+namespace ns3 {
+namespace ndn {
+
+// Necessary if you are planning to use ndn::AppHelper
+NS_OBJECT_ENSURE_REGISTERED (ApiApp);
+
+TypeId
+ApiApp::GetTypeId ()
+{
+  static TypeId tid = TypeId ("ns3::ndn::ApiApp")
+    .SetParent<Application> ()
+    .AddConstructor<ApiApp> ()
+    ;
+
+  return tid;
+}
+
+ApiApp::ApiApp ()
+{
+  m_handler = CreateObject<Handler> ();
+}
+
+void
+ApiApp::RequestData ()
+{
+  m_handler->sendInterest ("/test/prefix", boost::bind (&ApiApp::OnData
+}
+
+void
+ApiApp::StartApplication ()
+{
+  m_handler->SetNode (GetNode ());
+  m_handler->StartApplication ();
+  
+  Simulator::Schedule (Seconds (1), &::ns3::ndn::ApiApp::RequestData, this);
+}
+
+void
+ApiApp::StopApplication ()
+{
+  m_handler->StopApplication ();
+}
+
+} // namespace ndn
+} // namespace ns3
+