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 26 namespace android { 27 namespace installd { 28 29 // Helper class to read system properties into and manage as a string->string map. 30 class SystemProperties { 31 public: Load(const std::string & strFile)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. GetProperty(const std::string & key)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 SetProperty(const std::string & key,const std::string & value)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