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+/*
+    cw_binaural~: a binaural synthesis external for pure data
+    by David Doukhan - david.doukhan@gmail.com - http://www.limsi.fr/Individu/doukhan
+    and Anne Sedes - sedes.anne@gmail.com
+    Copyright (C) 2009-2011  David Doukhan and Anne Sedes
+
+    For more details, see CW_binaural~, a binaural synthesis external for Pure Data
+    David Doukhan and Anne Sedes, PDCON09
+
+
+    This program 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 of the License, or
+    (at your option) any later version.
+
+    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, see <http://www.gnu.org/licenses/>.
+*/
+
+
+#ifndef FLYWEIGHT_IR_FACTORY_HPP_
+# define FLYWEIGHT_IR_FACTORY_HPP_
+
+# include <map>
+# include "ir_key.hpp"
+
+# include "hrtfcont.hpp"
+# include "itdcont.hpp"
+
+
+// This class is a mixed flyweight and factory approach
+// aimed to obtain the requested impulse response
+class FlyweightIrFactory
+{
+public:
+  // there should be only one flyweightfactory
+  // so we use a singleton design pattern
+  static FlyweightIrFactory*	instance();
+
+  // get a hrtf set container corresponding
+  // to a given set of parameters
+  HrtfCont*			hrtf_set_get(const ir_key& k);
+  // get a set of itd corresponding to a given set of parameters
+  ItdCont*			itd_set_get(ir_key k);
+private:
+  // check if a given key is consistent
+  bool				is_hrtf_set_key_consistent(const ir_key& k);
+
+  // tells if a number is a power of 2
+  bool				ispowerof2(size_t n);
+
+  // All Hrtf sets will be stored in a hash map
+  // indexed by the requested preprocessing options
+  // on the hrtf set
+  map<ir_key, HrtfCont*, ir_key_isless>	_hrtf_db; 
+  
+  // a separate map is used for ITD computations
+  // on a longer term, it will allow to compute itd using
+  // different methods
+  map<ir_key, ItdCont*, ir_key_isless>		_itd_db;
+
+  FlyweightIrFactory() {}
+  static FlyweightIrFactory*	_instance;
+};
+
+#endif