Start of serious reorganization

The whole forwarding logic is (will be) moved to the Forwarding Strategy
class.
diff --git a/model/content-store/ccnx-content-store-policies.h b/model/content-store/ccnx-content-store-policies.h
new file mode 100644
index 0000000..cb8ee10
--- /dev/null
+++ b/model/content-store/ccnx-content-store-policies.h
@@ -0,0 +1,142 @@
+/* -*-  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>
+ *         Ilya Moiseenko <iliamo@cs.ucla.edu>
+ */
+
+#ifndef CCNX_CONTENT_STORE_POLICIES_H
+#define	CCNX_CONTENT_STORE_POLICIES_H
+
+// #include "ns3/ccnx.h"
+
+#include "ccnx-content-store-impl.h"
+
+#include "../../utils/trie.h"
+#include "../../utils/trie-with-policy.h"
+
+#include "../../utils/lru-policy.h"
+#include "../../utils/random-policy.h"
+#include "../../utils/fifo-policy.h"
+
+namespace  ns3
+{
+
+/**
+ * \ingroup ccnx
+ * \brief Content Store with LRU replacement policy
+ */
+class CcnxContentStoreLru :
+    public CcnxContentStoreImpl<
+       ndnSIM::trie_with_policy<CcnxNameComponents,
+                                ndnSIM::smart_pointer_payload_traits<CcnxContentStoreEntry>,
+                                ndnSIM::lru_policy_traits >
+      >
+{
+public:
+  /**
+   * \brief Interface ID
+   *
+   * \return interface ID
+   */
+  static TypeId GetTypeId ();
+
+  /**
+   * Default constructor
+   */
+  CcnxContentStoreLru ();
+  virtual ~CcnxContentStoreLru ();
+
+private:
+  void
+  SetMaxSize (uint32_t maxSize);
+
+  uint32_t
+  GetMaxSize () const;
+};
+
+
+/**
+ * \ingroup ccnx
+ * \brief Content Store with RANDOM replacement policy
+ */
+class CcnxContentStoreRandom :
+    public CcnxContentStoreImpl<
+      ndnSIM::trie_with_policy<CcnxNameComponents,
+                       ndnSIM::smart_pointer_payload_traits<CcnxContentStoreEntry>,
+                       ndnSIM::random_policy_traits >
+      >
+{
+public:
+  /**
+   * \brief Interface ID
+   *
+   * \return interface ID
+   */
+  static TypeId GetTypeId ();
+
+  /**
+   * Default constructor
+   */
+  CcnxContentStoreRandom ();
+  virtual ~CcnxContentStoreRandom ();
+
+private:
+  void
+  SetMaxSize (uint32_t maxSize);
+
+  uint32_t
+  GetMaxSize () const;
+};
+
+/**
+ * \ingroup ccnx
+ * \brief Content Store with FIFO replacement policy
+ */
+class CcnxContentStoreFifo :
+    public CcnxContentStoreImpl<
+      ndnSIM::trie_with_policy<CcnxNameComponents,
+                       ndnSIM::smart_pointer_payload_traits<CcnxContentStoreEntry>,
+                       ndnSIM::fifo_policy_traits >
+      >
+{
+public:
+  /**
+   * \brief Interface ID
+   *
+   * \return interface ID
+   */
+  static TypeId GetTypeId ();
+
+  /**
+   * Default constructor
+   */
+  CcnxContentStoreFifo ();
+  virtual ~CcnxContentStoreFifo ();
+
+private:
+  void
+  SetMaxSize (uint32_t maxSize);
+
+  uint32_t
+  GetMaxSize () const;
+};
+
+
+} //namespace ns3
+
+#endif // CCNX_CONTENT_STORE_POLICIES_H