source/directorycollection.h

   1 #ifndef MSP_DATAFILE_DIRECTORYCOLLECTION_H_
   2 #define MSP_DATAFILE_DIRECTORYCOLLECTION_H_
   3
   4 #include <msp/fs/path.h>
   5 #include "collection.h"
   6
   7 namespace Msp {
   8 namespace DataFile {
   9
  10 /**
  11 A Collection that can automatically load items from files in a directory.
  12 */
  13 class DirectoryCollection: public Collection
  14 {
  15 private:
  16         std::list<FS::Path> dirs;
  17
  18 public:
  19         DirectoryCollection();
  20
  21 protected:
  22         void set_directory(const FS::Path &);
  23         void add_directory(const FS::Path &);
  24
  25         /** Examines the names of files in the designated directories and adds any
  26         applicable ones as future objects. */
  27         void load_names();
  28
  29         template<typename T>
  30         CollectionItemType<T> &add_type()
  31         {
  32                 return Collection::add_type<T>().creator(&DirectoryCollection::create<T>);
  33         }
  34
  35 private:
  36         template<typename T>
  37         T *create(const std::string &name)
  38         {
  39                 FS::Path file;
  40                 if(lookup_file(name, file))
  41                 {
  42                         RefPtr<T> item = new T;
  43                         ItemLoader<T> ldr(*item, *this);
  44                         IO::BufferedFile in(file.str());
  45                         Parser parser(in, file.str());
  46                         ldr.load(parser);
  47                         return item.release();
  48                 }
  49                 else
  50                         return 0;
  51         }
  52
  53 protected:
  54         bool lookup_file(const std::string &, FS::Path &) const;
  55 };
  56
  57 } // namespace DataFile
  58 } // namespace Msp
  59
  60 #endif