Merge 153342 - Print preview: Use an ID instead of memory pointer string in WebUI.

chrome/browser/printing/print_preview_data_service.cc

 // 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 (index != printing::COMPLETE_PREVIEW_DOCUMENT_INDEX &&
-        index < printing::FIRST_PAGE_INDEX) {
+    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 (index != printing::COMPLETE_PREVIEW_DOCUMENT_INDEX &&
-        index < printing::FIRST_PAGE_INDEX) {
+    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 (page_data_map_.find(printing::COMPLETE_PREVIEW_DOCUMENT_INDEX) !=
-        page_data_map_.end()) {
+    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(
-    const std::string& preview_ui_addr_str,
+    int32 preview_ui_id,
     int index,
     scoped_refptr<base::RefCountedBytes>* data_bytes) {
   *data_bytes = NULL;
-  PreviewDataStoreMap::iterator it = data_store_map_.find(preview_ui_addr_str);
+  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(
-    const std::string& preview_ui_addr_str,
+    int32 preview_ui_id,
     int index,
     const base::RefCountedBytes* data_bytes) {
-  PreviewDataStoreMap::iterator it = data_store_map_.find(preview_ui_addr_str);
-  if (it == data_store_map_.end())
-    data_store_map_[preview_ui_addr_str] = new PrintPreviewDataStore();
+  if (!ContainsKey(data_store_map_, preview_ui_id))
+    data_store_map_[preview_ui_id] = new PrintPreviewDataStore();
 
-  data_store_map_[preview_ui_addr_str]->SetPreviewDataForIndex(index,
-                                                               data_bytes);
+  data_store_map_[preview_ui_id]->SetPreviewDataForIndex(index, data_bytes);
 }
 
-void PrintPreviewDataService::RemoveEntry(
-    const std::string& preview_ui_addr_str) {
-  PreviewDataStoreMap::iterator it = data_store_map_.find(preview_ui_addr_str);
-  if (it != data_store_map_.end())
-    data_store_map_.erase(it);
+void PrintPreviewDataService::RemoveEntry(int32 preview_ui_id) {
+  data_store_map_.erase(preview_ui_id);
 }
 
-int PrintPreviewDataService::GetAvailableDraftPageCount(
-    const std::string& preview_ui_addr_str) {
-  if (data_store_map_.find(preview_ui_addr_str) != data_store_map_.end())
-    return data_store_map_[preview_ui_addr_str]->GetAvailableDraftPageCount();
-  return 0;
+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();
 }