1/*
2 * Copyright (C) 2015 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 OTAPREOPT_SYSTEM_PROPERTIES_H_
18#define OTAPREOPT_SYSTEM_PROPERTIES_H_
19
20#include <fstream>
21#include <string>
22#include <unordered_map>
23
24#include <file_parsing.h>
25
26namespace android {
27namespace installd {
28
29// Helper class to read system properties into and manage as a string->string map.
30class SystemProperties {
31 public:
32    bool Load(const std::string& strFile) {
33        return ParseFile(strFile, [&](const std::string& line) {
34            size_t equals_pos = line.find('=');
35            if (equals_pos == std::string::npos || equals_pos == 0) {
36                // Did not find equals sign, or it's the first character - isn't a valid line.
37                return true;
38            }
39
40            std::string key = line.substr(0, equals_pos);
41            std::string value = line.substr(equals_pos + 1,
42                                            line.length() - equals_pos + 1);
43
44            properties_.insert(std::make_pair(key, value));
45
46            return true;
47        });
48    }
49
50    // Look up the key in the map. Returns null if the key isn't mapped.
51    const std::string* GetProperty(const std::string& key) const {
52        auto it = properties_.find(key);
53        if (it != properties_.end()) {
54            return &it->second;
55        }
56        return nullptr;
57    }
58
59    void SetProperty(const std::string& key, const std::string& value) {
60        properties_.insert(std::make_pair(key, value));
61    }
62
63 private:
64    // The actual map.
65    std::unordered_map<std::string, std::string> properties_;
66};
67
68}  // namespace installd
69}  // namespace android
70
71#endif  // OTAPREOPT_SYSTEM_PROPERTIES_H_
72