1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef BASE_ENVIRONMENT_H_ 6 #define BASE_ENVIRONMENT_H_ 7 #pragma once 8 9 #include <string> 10 11 #include "base/base_api.h" 12 #include "build/build_config.h" 13 14 namespace base { 15 16 namespace env_vars { 17 18 #if defined(OS_POSIX) 19 extern const char kHome[]; 20 #endif 21 22 } // namespace env_vars 23 24 class BASE_API Environment { 25 public: 26 virtual ~Environment(); 27 28 // Static factory method that returns the implementation that provide the 29 // appropriate platform-specific instance. 30 static Environment* Create(); 31 32 // Gets an environment variable's value and stores it in |result|. 33 // Returns false if the key is unset. 34 virtual bool GetVar(const char* variable_name, std::string* result) = 0; 35 36 // Syntactic sugar for GetVar(variable_name, NULL); 37 virtual bool HasVar(const char* variable_name); 38 39 // Returns true on success, otherwise returns false. 40 virtual bool SetVar(const char* variable_name, 41 const std::string& new_value) = 0; 42 43 // Returns true on success, otherwise returns false. 44 virtual bool UnSetVar(const char* variable_name) = 0; 45 }; 46 47 } // namespace base 48 49 #endif // BASE_ENVIRONMENT_H_ 50