DurableIterator.h

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00038 
00039 
00040 #ifndef __OASYS_DURABLE_STORE_INTERNAL_HEADER__
00041 #error DurableIterator.h must only be included from within DurableStore.h
00042 #endif
00043 
00044 
00049 class DurableIterator {
00050 public:
00051     // virtual destructor
00052     virtual ~DurableIterator() {}
00053 
00076     virtual int next() = 0;
00077 
00081     virtual int get_key(SerializableObject* key) = 0;
00082 };
00083 
00084 //----------------------------------------------------------------------------
00091 template<typename _filter>
00092 class DurableFilterIterator : public DurableIterator {
00093 public:
00094     DurableFilterIterator(DurableIterator* itr)
00095         : itr_(itr) {}
00096 
00097     // virtual from DurableIterator
00098     int next() 
00099     {
00100         for (;;) 
00101         {
00102             int ret = itr_->next();
00103             if (ret != DS_OK) {
00104                 return ret;
00105             }
00106             
00107             if (_filter::accept(itr_)) {
00108                 return DS_OK;
00109             }
00110         }
00111     }
00112 
00113     int get_key(SerializableObject* key) 
00114     {
00115         return itr_->get_key(key);
00116     }
00117     
00118 private:
00119     DurableIterator* itr_;
00120 };

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