1 files changed, 48 insertions, 0 deletions
diff --git a/cpp/include/libaddressinput/null_storage.h b/cpp/include/libaddressinput/null_storage.h
new file mode 100644
index 0000000..66d9ab5
--- /dev/null
+++ b/cpp/include/libaddressinput/null_storage.h
@@ -0,0 +1,48 @@
+// Copyright (C) 2014 Google Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// It is not always desirable to cache libaddressinput data. Sometimes it might
+// give better performance characteristics to not cache. This implementation of
+// the Storage interface therefore doesn't actually store anything.
+
+#ifndef I18N_ADDRESSINPUT_NULL_STORAGE_H_
+#define I18N_ADDRESSINPUT_NULL_STORAGE_H_
+
+#include <libaddressinput/storage.h>
+#include <libaddressinput/util/basictypes.h>
+
+#include <string>
+
+namespace i18n {
+namespace addressinput {
+
+class NullStorage : public Storage {
+ public:
+  NullStorage();
+  virtual ~NullStorage();
+
+  // No-op.
+  virtual void Put(const std::string& key, std::string* data);
+
+  // Always calls the |data_ready| callback function signalling failure.
+  virtual void Get(const std::string& key, const Callback& data_ready) const;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(NullStorage);
+};
+
+}  // namespace addressinput
+}  // namespace i18n
+
+#endif  // I18N_ADDRESSINPUT_NULL_STORAGE_H_