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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/printing/print_preview_data_service.h"
#include "base/memory/ref_counted_memory.h"
#include "base/memory/singleton.h"
#include "base/stl_util.h"
#include "printing/print_job_constants.h"
// PrintPreviewDataStore stores data for preview workflow and preview printing
// workflow.
//
// NOTE:
// This class stores a list of PDFs. The list |index| is zero-based and can
// be |printing::COMPLETE_PREVIEW_DOCUMENT_INDEX| to represent complete preview
// document. The PDF stored at |printing::COMPLETE_PREVIEW_DOCUMENT_INDEX| is
// optimized with font subsetting, compression, etc. PDF's stored at all other
// indices are unoptimized.
//
// PrintPreviewDataStore owns the data and is responsible for freeing it when
// either:
// a) There is a new data.
// b) When PrintPreviewDataStore is destroyed.
//
class PrintPreviewDataStore : public base::RefCounted<PrintPreviewDataStore> {
public:
PrintPreviewDataStore() {}
// Get the preview page for the specified |index|.
void GetPreviewDataForIndex(int index,
scoped_refptr<base::RefCountedBytes>* data) {
if (IsInvalidIndex(index))
return;
PreviewPageDataMap::iterator it = page_data_map_.find(index);
if (it != page_data_map_.end())
*data = it->second.get();
}
// Set/Update the preview data entry for the specified |index|.
void SetPreviewDataForIndex(int index, const base::RefCountedBytes* data) {
if (IsInvalidIndex(index))
return;
page_data_map_[index] = const_cast<base::RefCountedBytes*>(data);
}
// Returns the available draft page count.
int GetAvailableDraftPageCount() {
int page_data_map_size = page_data_map_.size();
if (ContainsKey(page_data_map_, printing::COMPLETE_PREVIEW_DOCUMENT_INDEX))
page_data_map_size--;
return page_data_map_size;
}
private:
friend class base::RefCounted<PrintPreviewDataStore>;
// 1:1 relationship between page index and its associated preview data.
// Key: Page index is zero-based and can be
// |printing::COMPLETE_PREVIEW_DOCUMENT_INDEX| to represent complete preview
// document.
// Value: Preview data.
typedef std::map<int, scoped_refptr<base::RefCountedBytes> >
PreviewPageDataMap;
~PrintPreviewDataStore() {}
static bool IsInvalidIndex(int index) {
return (index != printing::COMPLETE_PREVIEW_DOCUMENT_INDEX &&
index < printing::FIRST_PAGE_INDEX);
}
PreviewPageDataMap page_data_map_;
DISALLOW_COPY_AND_ASSIGN(PrintPreviewDataStore);
};
// static
PrintPreviewDataService* PrintPreviewDataService::GetInstance() {
return Singleton<PrintPreviewDataService>::get();
}
PrintPreviewDataService::PrintPreviewDataService() {
}
PrintPreviewDataService::~PrintPreviewDataService() {
}
void PrintPreviewDataService::GetDataEntry(
int32 preview_ui_id,
int index,
scoped_refptr<base::RefCountedBytes>* data_bytes) {
*data_bytes = NULL;
PreviewDataStoreMap::const_iterator it = data_store_map_.find(preview_ui_id);
if (it != data_store_map_.end())
it->second->GetPreviewDataForIndex(index, data_bytes);
}
void PrintPreviewDataService::SetDataEntry(
int32 preview_ui_id,
int index,
const base::RefCountedBytes* data_bytes) {
if (!ContainsKey(data_store_map_, preview_ui_id))
data_store_map_[preview_ui_id] = new PrintPreviewDataStore();
data_store_map_[preview_ui_id]->SetPreviewDataForIndex(index, data_bytes);
}
void PrintPreviewDataService::RemoveEntry(int32 preview_ui_id) {
data_store_map_.erase(preview_ui_id);
}
int PrintPreviewDataService::GetAvailableDraftPageCount(int32 preview_ui_id) {
PreviewDataStoreMap::const_iterator it = data_store_map_.find(preview_ui_id);
return (it == data_store_map_.end()) ?
0 : it->second->GetAvailableDraftPageCount();
}
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