[Payment Request] Region data loader

ios/chrome/browser/ui/payments/region_data_loader.mm

+// Copyright 2017 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.
+
+#import "ios/chrome/browser/ui/payments/region_data_loader.h"
+
+#include "base/strings/sys_string_conversions.h"
+#include "components/autofill/core/browser/region_data_loader.h"
+#include "ui/base/models/combobox_model.h"
+
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
+namespace {
+const int64_t kTimeoutInMilliseconds = 5000;
+}  // namespace
+
+RegionDataLoader::RegionDataLoader(id<RegionDataLoaderConsumer> consumer)
+    : consumer_(consumer) {
+  region_model_.AddObserver(this);
+}
+
+RegionDataLoader::~RegionDataLoader() {
+  region_model_.RemoveObserver(this);
+}
+
+void RegionDataLoader::LoadRegionData(
+    const std::string& country_code,
+    autofill::RegionDataLoader* autofill_region_data_loader) {
+  region_model_.LoadRegionData(country_code, autofill_region_data_loader,
+                               kTimeoutInMilliseconds);
+}
+
+void RegionDataLoader::OnComboboxModelChanged(ui::ComboboxModel* model) {
+  autofill::RegionComboboxModel* region_model =
+      static_cast<autofill::RegionComboboxModel*>(model);
+  if (region_model->IsPendingRegionDataLoad())
+    return;
+
+  NSMutableArray<NSString*>* regions = [[NSMutableArray alloc] init];
+  if (!region_model->failed_to_load_data()) {
+    for (int i = 0; i < region_model->GetItemCount(); ++i) {
+      if (!region_model->IsItemSeparatorAt(i))
+        [regions
+            addObject:base::SysUTF16ToNSString(region_model->GetItemAt(i))];
+    }
+  }
+  [consumer_ regionDataLoaderDidSucceedWithRegions:regions];
+}