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// Copyright (C) 2013 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.
//
// A wrapper object for Storage that stores data with a checksum and a
// timestamp. The existence of checksum and timestamp fields is transparent to
// the user of the object.
#ifndef I18N_ADDRESSINPUT_VALIDATING_STORAGE_H_
#define I18N_ADDRESSINPUT_VALIDATING_STORAGE_H_
#include <libaddressinput/storage.h>
#include <libaddressinput/util/basictypes.h>
#include <libaddressinput/util/scoped_ptr.h>
#include <string>
namespace i18n {
namespace addressinput {
// Wraps Storage to add checksum and timestamp to stored data. Sample usage:
// scoped_ptr<Storage> file_storage = ...;
// ValidatingStorage storage(file_storage));
// storage.Put("key", new std::string("data"));
// const scoped_ptr<const ValidatingStorage::Callback> data_ready(
// BuildCallback(this, &MyClass::OnDataReady));
// storage.Get("key", *data_ready);
class ValidatingStorage : public Storage {
public:
// Takes ownership of |storage|.
explicit ValidatingStorage(Storage* storage);
virtual ~ValidatingStorage();
// Storage implementation.
virtual void Put(const std::string& key, std::string* data);
// Storage implementation.
// If the data is invalid, then |data_ready| will be called with (false, key,
// empty-string). If the data is valid, but stale, then |data_ready| will be
// called with (false, key, stale-data). If the data is valid and fresh, then
// |data_ready| will be called with (true, key, fresh-data).
virtual void Get(const std::string& key, const Callback& data_ready) const;
private:
// The storage being wrapped.
scoped_ptr<Storage> wrapped_storage_;
DISALLOW_COPY_AND_ASSIGN(ValidatingStorage);
};
} // namespace addressinput
} // namespace i18n
#endif // I18N_ADDRESSINPUT_VALIDATING_STORAGE_H_
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