source: source/ariba/utility/misc/KeyMapping.hpp@ 3057

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#ifndef KEY_MAPPING_H__

#define KEY_MAPPING_H__



#include <map>



using std::map;

using std::pair;



namespace ariba {

namespace utility {



/**

* Template class for the administration

* of a mapping to an index key with networks

*/

template<class T>

class KeyMapping {

private:

        typedef map<T,unsigned long> KeyMap; //< maps an item to an id, e.g. a node pair to a linkid

        typedef map<unsigned long, KeyMap> NetworkKeyMap; //< maps the network to the KeyMap, which map is responsible for this network?



        typedef typename KeyMap::iterator KeyMapIterator;

        typedef typename NetworkKeyMap::iterator NetworkKeyMapIterator;



        NetworkKeyMap networkKeyMap;



        inline unsigned long nextid(){

                return rand()+time(0);

        }



public:

        inline KeyMapping(){

                srand( time(NULL) );

        }



        inline ~KeyMapping(){

        }



        inline bool exists(unsigned long network, T item){



                NetworkKeyMapIterator i = networkKeyMap.find( network );

                if( i == networkKeyMap.end()) return false;



                KeyMapIterator k = i->second.find( item );

                return ( k != i->second.end() );

        }



        inline unsigned long get(unsigned long network, T item){

                assert( exists(network, item) );



                NetworkKeyMapIterator i = networkKeyMap.find( network );

                KeyMapIterator k = i->second.find( item );



                return k->second;

        }



        inline unsigned long insert(unsigned long network, T item){



                KeyMap* keyMap = NULL;



                // if we have no link map yet for this network,

                // insert one and get the reference back to work with



                NetworkKeyMapIterator i = networkKeyMap.find( network );



                if( i == networkKeyMap.end() ){

                        pair<NetworkKeyMapIterator, bool> ret =

                                networkKeyMap.insert( make_pair(network,KeyMap()) );



                        keyMap = &(ret.first->second);

                } else {



                        keyMap = &(i->second);

                }



                unsigned long key = nextid();

                keyMap->insert( make_pair( item, key) );



                assert( get(network,item) == key );

                return key;

        }



        inline void remove(unsigned long network, T item){

                NetworkKeyMapIterator i = networkKeyMap.find( network );

                if( i == networkKeyMap.end() ) return;



                i->second.erase( item );

        }



}; // class KeyMapping



}} // namespave spovnet, common



#endif // KEY_MAPPING_H__