1 // 2 // Copyright (C) 2012 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_SHIMS_ENVIRONMENT_H_ 18 #define SHILL_SHIMS_ENVIRONMENT_H_ 19 20 #include <map> 21 #include <string> 22 23 #include <base/lazy_instance.h> 24 25 namespace shill { 26 27 namespace shims { 28 29 // Environment access utilities. 30 class Environment { 31 public: 32 virtual ~Environment(); 33 34 // This is a singleton -- use Environment::GetInstance()->Foo(). 35 static Environment* GetInstance(); 36 37 // Sets |value| to the value of environment variable |name| and returns 38 // true. Returns false if variable |name| is not set. 39 virtual bool GetVariable(const std::string& name, std::string* value); 40 41 // Parses and returns the environment as a name->value string map. 42 virtual std::map<std::string, std::string> AsMap(); 43 44 protected: 45 Environment(); 46 47 private: 48 friend struct base::DefaultLazyInstanceTraits<Environment>; 49 50 DISALLOW_COPY_AND_ASSIGN(Environment); 51 }; 52 53 } // namespace shims 54 55 } // namespace shill 56 57 #endif // SHILL_SHIMS_ENVIRONMENT_H_ 58