Add missing data_unit_handler interface.

git-svn-id: http://op25.osmocom.org/svn/trunk@151 65a5c917-d112-43f1-993d-58c26a4786be

decoder/src/lib/data_unit_handler.cc

@@ -0,0 +1,19 @@
+#include "data_unit_handler.h"
+
+data_unit_handler::~data_unit_handler()
+{
+}
+
+void
+data_unit_handler::handle(data_unit_sptr du)
+{
+   if(d_next) {
+      d_next->handle(du);
+   }
+}
+
+data_unit_handler::data_unit_handler(data_unit_handler_sptr next) :
+   d_next(next)
+{
+}
+

decoder/src/lib/data_unit_handler.h

@@ -0,0 +1,71 @@
+/* -*- C++ -*- */
+
+/*
+ * Copyright 2008 Steve Glass
+ * 
+ * This file is part of OP25.
+ * 
+ * OP25 is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3, or (at your option)
+ * any later version.
+ * 
+ * OP25 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 OP25; see the file COPYING.  If not, write to the Free
+ * Software Foundation, Inc., 51 Franklin Street, Boston, MA
+ * 02110-1301, USA.
+*/
+
+#ifndef INCLUDED_DATA_UNIT_HANDLER_H
+#define INCLUDED_DATA_UNIT_HANDLER_H
+
+#include <boost/noncopyable.hpp>
+#include <boost/shared_ptr.hpp>
+#include <data_unit.h>
+
+typedef boost::shared_ptr<class data_unit_handler> data_unit_handler_sptr;
+
+/**
+ * P25 data_unit_handler interface.
+ */
+class data_unit_handler : public boost::noncopyable
+{
+
+public:
+
+   /**
+    * data_unit_handler virtual destructor.
+    */
+   virtual ~data_unit_handler();
+
+   /**
+    * Handle a received P25 frame.
+    *
+    * \param du A non-null data_unit_sptr to handle.
+    */
+   virtual void handle(data_unit_sptr du) = 0;
+
+protected:
+
+   /**
+    * data_unit_handler default constructor.
+    *
+    * \param next The next data_unit_handler in this chain.
+    */
+   data_unit_handler(data_unit_handler_sptr next);
+
+private:
+
+   /**
+    * The next data_unit_handler in this chain.
+    */
+   data_unit_handler_sptr d_next;
+
+};
+
+#endif /* INCLUDED_DATA_UNIT_HANDLER_H */