Preview tab data source. (Sample CL)

chrome/browser/printing/print_preview_data_service.cc

+// Copyright (c) 2011 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/singleton.h"
+#include "chrome/browser/ui/webui/print_preview_ui.h"
+
+// static
+PrintPreviewDataService* PrintPreviewDataService::GetInstance() {
+  return Singleton<PrintPreviewDataService>::get();
+}
+
+PrintPreviewDataService::PrintPreviewDataService() {
+}
+
+PrintPreviewDataService::~PrintPreviewDataService() {
+}
+
+void PrintPreviewDataService::GetDataEntry(
+    PrintPreviewUI* preview_ui, scoped_refptr<RefCountedBytes>* data_bytes) {
+  printf("Get Data Entry: %p \n", preview_ui);
+  PreviewDataSourceMap::iterator it = data_src_map_.find(preview_ui);
+  if (it != data_src_map_.end())
+    *data_bytes = it->second.get();
+}
+
+void PrintPreviewDataService::SetDataEntry(
+    PrintPreviewUI* preview_ui, const RefCountedBytes* data_bytes) {
+  printf("S Data Entry: %p \n", preview_ui);
+  RemoveEntry(preview_ui);
+  data_src_map_[preview_ui] = const_cast<RefCountedBytes*>(data_bytes);
+}
+
+void PrintPreviewDataService::RemoveEntry(
+    PrintPreviewUI* preview_ui) {
+  printf("R Data Entry: %p \n", preview_ui);
+  PreviewDataSourceMap::iterator it = data_src_map_.find(preview_ui);
+  if (it != data_src_map_.end())
+    data_src_map_.erase(it);
+}