ppapi/shared_impl/ppb_file_ref_shared.h

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef PPAPI_SHARED_IMPL_PPB_FILE_REF_SHARED_H_
   6 #define PPAPI_SHARED_IMPL_PPB_FILE_REF_SHARED_H_
   7
   8 #include <string>
   9
  10 #include "base/compiler_specific.h"
  11 #include "ppapi/shared_impl/resource.h"
  12 #include "ppapi/thunk/ppb_file_ref_api.h"
  13
  14 namespace ppapi {
  15
  16 class StringVar;
  17
  18 // FileRefs are created in a number of places and they include a number of
  19 // return values. This struct encapsulates everything in one place.
  20 struct PPB_FileRef_CreateInfo {
  21   PPB_FileRef_CreateInfo() : file_system_type(PP_FILESYSTEMTYPE_EXTERNAL) {}
  22
  23   ppapi::HostResource resource;
  24   int file_system_type;  // One of PP_FileSystemType values.
  25   std::string path;
  26   std::string name;
  27
  28   // Since FileRef needs to hold a FileSystem reference, we need to pass the
  29   // resource in this CreateInfo.  Note that this is a plugin resource as
  30   // FileSystem is already in new design.
  31   PP_Resource file_system_plugin_resource;
  32 };
  33
  34 // This class provides the shared implementation of a FileRef. The functions
  35 // that actually "do stuff" like Touch and MakeDirectory are implemented
  36 // differently for the proxied and non-proxied derived classes.
  37 class PPAPI_SHARED_EXPORT PPB_FileRef_Shared
  38     : public Resource,
  39       public thunk::PPB_FileRef_API {
  40  public:
  41   PPB_FileRef_Shared(ResourceObjectType type,
  42                      const PPB_FileRef_CreateInfo& info);
  43   virtual ~PPB_FileRef_Shared();
  44
  45   // Resource overrides.
  46   virtual thunk::PPB_FileRef_API* AsPPB_FileRef_API() OVERRIDE;
  47
  48   // PPB_FileRef_API implementation (partial).
  49   virtual PP_FileSystemType GetFileSystemType() const OVERRIDE;
  50   virtual PP_Var GetName() const OVERRIDE;
  51   virtual PP_Var GetPath() const OVERRIDE;
  52   virtual const PPB_FileRef_CreateInfo& GetCreateInfo() const OVERRIDE;
  53   virtual PP_Var GetAbsolutePath() = 0;
  54
  55  private:
  56   PPB_FileRef_CreateInfo create_info_;
  57
  58   // Lazily initialized vars created from the create_info_. This is so we can
  59   // return the identical string object every time they're requested.
  60   mutable scoped_refptr<StringVar> name_var_;
  61   mutable scoped_refptr<StringVar> path_var_;
  62
  63   DISALLOW_IMPLICIT_CONSTRUCTORS(PPB_FileRef_Shared);
  64 };
  65
  66 }  // namespace ppapi
  67
  68 #endif  // PPAPI_SHARED_IMPL_PPB_FILE_REF_SHARED_H_