Another set of refactoring
diff --git a/helper/ccnb-parser/visitors/interest-visitor.h b/helper/ccnb-parser/visitors/interest-visitor.h
new file mode 100644
index 0000000..f78d07f
--- /dev/null
+++ b/helper/ccnb-parser/visitors/interest-visitor.h
@@ -0,0 +1,52 @@
+/* -*- Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil -*- */
+/*
+ * Copyright (c) 2011 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>
+ */
+
+#ifndef _CCNB_PARSER_INTEREST_VISITOR_H_
+#define _CCNB_PARSER_INTEREST_VISITOR_H_
+
+#include "void-depth-first-visitor.h"
+
+namespace ns3 {
+namespace ndn {
+namespace CcnbParser {
+
+/**
+ * \ingroup ccnx-ccnb
+ * \brief Visitor that fills fields in CcnxInterestHeader
+ *
+ * Usage example:
+ * \code
+ * Ptr<CcnxInterestHeader> header = Create<CcnxInterestHeader> ();
+ * Ptr<CcnbParser::Block> root = CcnbParser::Block::ParseBlock (i);
+ * InterestVisitor visitor;
+ * root->accept (visitor, *header);
+ * \endcode
+ */
+class InterestVisitor : public VoidDepthFirstVisitor
+{
+public:
+ virtual void visit (Dtag &n, boost::any param/*should be CcnxInterestHeader* */);
+};
+
+} // namespace CcnbParser
+} // namespace ndn
+} // namespace ns3
+
+#endif // _CCNB_PARSER_INTEREST_VISITOR_H_