1//
2// Copyright (C) 2014 The Android Open Source Project
3//
4// Licensed under the Apache License, Version 2.0 (the "License");
5// you may not use this file except in compliance with the License.
6// You may obtain a copy of the License at
7//
8//      http://www.apache.org/licenses/LICENSE-2.0
9//
10// Unless required by applicable law or agreed to in writing, software
11// distributed under the License is distributed on an "AS IS" BASIS,
12// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13// See the License for the specific language governing permissions and
14// limitations under the License.
15//
16
17#ifndef SHILL_PROPERTY_OBSERVER_INTERFACE_H_
18#define SHILL_PROPERTY_OBSERVER_INTERFACE_H_
19
20#include <base/macros.h>
21
22namespace shill {
23
24// An abstract interface for objects that retain a saved copy of
25// a property accessor and can report whether that value has changed.
26class PropertyObserverInterface {
27 public:
28  PropertyObserverInterface() {}
29  virtual ~PropertyObserverInterface() {}
30
31  // Update the saved value used for comparison.
32  virtual void Update() = 0;
33
34 private:
35  DISALLOW_COPY_AND_ASSIGN(PropertyObserverInterface);
36};
37
38}  // namespace shill
39
40#endif  // SHILL_PROPERTY_OBSERVER_INTERFACE_H_
41