1 /*
2  * Copyright (C) 2017 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 #pragma once
18 
19 #include "src/statsd_config.pb.h"
20 
21 #include <string>
22 
23 namespace android {
24 namespace os {
25 namespace statsd {
26 
27 using std::hash;
28 using std::string;
29 
30 /**
31  * Uniquely identifies a configuration.
32  */
33 class ConfigKey {
34 public:
35     ConfigKey();
36     ConfigKey(const ConfigKey& that);
37     ConfigKey(int uid, int64_t id);
38     ~ConfigKey();
39 
GetUid()40     inline int GetUid() const {
41         return mUid;
42     }
GetId()43     inline int64_t GetId() const {
44         return mId;
45     }
46 
47     inline bool operator<(const ConfigKey& that) const {
48         if (mUid < that.mUid) {
49             return true;
50         }
51         if (mUid > that.mUid) {
52             return false;
53         }
54         return mId < that.mId;
55     };
56 
57     inline bool operator==(const ConfigKey& that) const {
58         return mUid == that.mUid && mId == that.mId;
59     };
60 
61     string ToString() const;
62 
63 private:
64     int64_t mId;
65     int mUid;
66 };
67 
68 int64_t StrToInt64(const string& str);
69 
70 }  // namespace statsd
71 }  // namespace os
72 }  // namespace android
73 
74 /**
75  * A hash function for ConfigKey so it can be used for unordered_map/set.
76  */
77 template <>
78 struct std::hash<android::os::statsd::ConfigKey> {
79     std::size_t operator()(const android::os::statsd::ConfigKey& key) const {
80         return (7 * key.GetUid()) ^ ((hash<long long>()(key.GetId())));
81     }
82 };
83