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.
5 #ifndef BASE_ENVIRONMENT_H_
6 #define BASE_ENVIRONMENT_H_
12 #include "base/base_export.h"
13 #include "base/strings/string16.h"
14 #include "base/strings/string_piece.h"
15 #include "build/build_config.h"
21 #if defined(OS_POSIX) || defined(OS_FUCHSIA)
22 BASE_EXPORT extern const char kHome[];
25 } // namespace env_vars
27 class BASE_EXPORT Environment {
29 virtual ~Environment();
31 // Returns the appropriate platform-specific instance.
32 static std::unique_ptr<Environment> Create();
34 // Gets an environment variable's value and stores it in |result|.
35 // Returns false if the key is unset.
36 virtual bool GetVar(StringPiece variable_name, std::string* result) = 0;
38 // Syntactic sugar for GetVar(variable_name, nullptr);
39 virtual bool HasVar(StringPiece variable_name);
41 // Returns true on success, otherwise returns false. This method should not
42 // be called in a multi-threaded process.
43 virtual bool SetVar(StringPiece variable_name,
44 const std::string& new_value) = 0;
46 // Returns true on success, otherwise returns false. This method should not
47 // be called in a multi-threaded process.
48 virtual bool UnSetVar(StringPiece variable_name) = 0;
52 using NativeEnvironmentString = std::wstring;
53 #elif defined(OS_POSIX) || defined(OS_FUCHSIA)
54 using NativeEnvironmentString = std::string;
56 using EnvironmentMap =
57 std::map<NativeEnvironmentString, NativeEnvironmentString>;
61 #endif // BASE_ENVIRONMENT_H_