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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_PRINTING_PRINT_PREVIEW_DATA_SERVICE_H_
#define CHROME_BROWSER_PRINTING_PRINT_PREVIEW_DATA_SERVICE_H_
#include <stdint.h>
#include <map>
#include <memory>
#include "base/memory/ref_counted.h"
class PrintPreviewDataStore;
namespace base {
template <typename T>
struct DefaultSingletonTraits;
class RefCountedMemory;
}
// PrintPreviewDataService manages data stores for chrome://print requests.
// It owns the data store object and is responsible for freeing it.
class PrintPreviewDataService {
public:
static PrintPreviewDataService* GetInstance();
PrintPreviewDataService(const PrintPreviewDataService&) = delete;
PrintPreviewDataService& operator=(const PrintPreviewDataService&) = delete;
// Get the data entry from PrintPreviewDataStore. `index` is zero-based or
// `printing::COMPLETE_PREVIEW_DOCUMENT_INDEX` to represent complete preview
// data. Use `index` to retrieve a specific preview page data. `data` is set
// to NULL if the requested page is not yet available.
void GetDataEntry(int32_t preview_ui_id,
int index,
scoped_refptr<base::RefCountedMemory>* data) const;
// Set/Update the data entry in PrintPreviewDataStore. `index` is zero-based
// or `printing::COMPLETE_PREVIEW_DOCUMENT_INDEX` to represent complete
// preview data. Use `index` to set/update a specific preview page data.
// NOTE: PrintPreviewDataStore owns the data. Do not refcount `data` before
// calling this function. It will be refcounted in PrintPreviewDataStore.
void SetDataEntry(int32_t preview_ui_id,
int index,
scoped_refptr<base::RefCountedMemory> data);
// Remove the corresponding PrintPreviewUI entry from the map.
void RemoveEntry(int32_t preview_ui_id);
private:
friend struct base::DefaultSingletonTraits<PrintPreviewDataService>;
// 1:1 relationship between PrintPreviewUI and data store object.
// Key: PrintPreviewUI ID.
// Value: Print preview data store object.
using PreviewDataStoreMap =
std::map<int32_t, std::unique_ptr<PrintPreviewDataStore>>;
PrintPreviewDataService();
~PrintPreviewDataService();
PreviewDataStoreMap data_store_map_;
};
#endif // CHROME_BROWSER_PRINTING_PRINT_PREVIEW_DATA_SERVICE_H_
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