chrome/browser/printing/print_preview_data_service.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 CHROME_BROWSER_PRINTING_PRINT_PREVIEW_DATA_SERVICE_H_
   6 #define CHROME_BROWSER_PRINTING_PRINT_PREVIEW_DATA_SERVICE_H_
   7
   8 #include <map>
   9 #include <string>
  10
  11 #include "base/memory/ref_counted.h"
  12
  13 template<typename T> struct DefaultSingletonTraits;
  14
  15 class PrintPreviewDataStore;
  16
  17 namespace base {
  18 class RefCountedBytes;
  19 }
  20
  21 // PrintPreviewDataService manages data stores for chrome://print requests.
  22 // It owns the data store object and is responsible for freeing it.
  23 class PrintPreviewDataService {
  24  public:
  25   static PrintPreviewDataService* GetInstance();
  26
  27   // Get the data entry from PrintPreviewDataStore. |index| is zero-based or
  28   // |printing::COMPLETE_PREVIEW_DOCUMENT_INDEX| to represent complete preview
  29   // data. Use |index| to retrieve a specific preview page data. |data| is set
  30   // to NULL if the requested page is not yet available.
  31   void GetDataEntry(int32_t preview_ui_id, int index,
  32                     scoped_refptr<base::RefCountedBytes>* data);
  33
  34   // Set/Update the data entry in PrintPreviewDataStore. |index| is zero-based
  35   // or |printing::COMPLETE_PREVIEW_DOCUMENT_INDEX| to represent complete
  36   // preview data. Use |index| to set/update a specific preview page data.
  37   // NOTE: PrintPreviewDataStore owns the data. Do not refcount |data| before
  38   // calling this function. It will be refcounted in PrintPreviewDataStore.
  39   void SetDataEntry(int32_t preview_ui_id, int index,
  40                     const base::RefCountedBytes* data);
  41
  42   // Remove the corresponding PrintPreviewUI entry from the map.
  43   void RemoveEntry(int32_t preview_ui_id);
  44
  45   // Returns the available draft page count.
  46   int GetAvailableDraftPageCount(int32_t preview_ui_id);
  47
  48  private:
  49   friend struct DefaultSingletonTraits<PrintPreviewDataService>;
  50
  51   // 1:1 relationship between PrintPreviewUI and data store object.
  52   // Key: PrintPreviewUI ID.
  53   // Value: Print preview data store object.
  54   using PreviewDataStoreMap =
  55       std::map<int32_t, scoped_refptr<PrintPreviewDataStore>>;
  56
  57   PrintPreviewDataService();
  58   virtual ~PrintPreviewDataService();
  59
  60   PreviewDataStoreMap data_store_map_;
  61
  62   DISALLOW_COPY_AND_ASSIGN(PrintPreviewDataService);
  63 };
  64
  65 #endif  // CHROME_BROWSER_PRINTING_PRINT_PREVIEW_DATA_SERVICE_H_