ConfigKey.h revision 20e9e6231a1aba79b4e5ae47f3ccfb066920e60f 
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 "frameworks/base/cmds/statsd/src/statsd_config.pb.h"
20
21#include <string>
22
23namespace android {
24namespace os {
25namespace statsd {
26
27using std::hash;
28using std::string;
29
30/**
31 * Uniquely identifies a configuration.
32 */
33class ConfigKey {
34public:
35    ConfigKey();
36    explicit ConfigKey(const ConfigKey& that);
37    ConfigKey(int uid, const int64_t& id);
38    ~ConfigKey();
39
40    inline int GetUid() const {
41        return mUid;
42    }
43    inline const 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
63private:
64    int64_t mId;
65    int mUid;
66};
67
68int64_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 * Unfortunately this has to go in std namespace because C++ is fun!
77 */
78namespace std {
79
80using android::os::statsd::ConfigKey;
81
82template <>
83struct hash<ConfigKey> {
84    std::size_t operator()(const ConfigKey& key) const {
85        return (7 * key.GetUid()) ^ ((hash<long long>()(key.GetId())));
86    }
87};
88
89}  // namespace std
90