alien.h

   1 #ifndef _ALIEN_H_
   2 #define _ALIEN_H_
   3
   4 #include <oberon.h>
   5 #include <store.h>
   6 #include <visitor.h>
   7 #include <iostream>
   8 #include <vector>
   9 #include <string>
  10
  11 namespace odc {
  12
  13 /**
  14  * Part of an alien store
  15  */
  16 struct AlienComponent {
  17         virtual std::string toString() = 0;
  18         virtual void accept(Visitor &visitor) const = 0;
  19 };
  20
  21 /**
  22  * Totally unstructured part of an alien store
  23  */
  24 struct AlienPiece : public AlienComponent {
  25         const char * const data;
  26         const size_t len;
  27
  28         AlienPiece(const char * const data, const size_t len);
  29
  30         virtual std::string toString();
  31         virtual void accept(Visitor &visitor) const;
  32 };
  33
  34 /**
  35  * Store component of an alien store
  36  */
  37 struct AlienPart : public AlienComponent {
  38         Store * const d_store;
  39
  40         AlienPart(Store * const store);
  41
  42         virtual std::string toString();
  43         virtual void accept(Visitor &visitor) const;
  44 };
  45
  46 /**
  47  * Any type that's not registered is treated as an "Alien".
  48  * This allows us to read files even if they contain things we're not aware of.
  49  * The alien will consist of AlienComponents, some of which we may be able to read.
  50  */
  51 class Alien : public Store {
  52         const TypePath d_path;
  53         std::vector<AlienComponent*> d_comps;
  54
  55         public:
  56
  57         Alien(INTEGER id, const TypePath &path);
  58
  59         std::vector<AlienComponent*> & getComponents();
  60
  61         // cause-: INTEGER;     (** # 0, the cause that turned this store into an alien **)
  62         // file-: Files.File;   (** base file holding alien pieces **)
  63         // comps-: AlienComp    (** the constituent components of this alien store **)
  64
  65         virtual std::string toString();
  66         virtual void accept(Visitor &visitor) const;
  67 };
  68
  69 }
  70 #endif // _ALIEN_H_