Repo created

TMessagesProj/jni/voip/webrtc/base/environment.h

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+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef BASE_ENVIRONMENT_H_
+#define BASE_ENVIRONMENT_H_
+
+#include <map>
+#include <memory>
+#include <string>
+
+#include "base/base_export.h"
+#include "base/strings/string16.h"
+#include "base/strings/string_piece.h"
+#include "build/build_config.h"
+
+namespace base {
+
+namespace env_vars {
+
+#if defined(OS_POSIX) || defined(OS_FUCHSIA)
+BASE_EXPORT extern const char kHome[];
+#endif
+
+}  // namespace env_vars
+
+class BASE_EXPORT Environment {
+ public:
+  virtual ~Environment();
+
+  // Returns the appropriate platform-specific instance.
+  static std::unique_ptr<Environment> Create();
+
+  // Gets an environment variable's value and stores it in |result|.
+  // Returns false if the key is unset.
+  virtual bool GetVar(StringPiece variable_name, std::string* result) = 0;
+
+  // Syntactic sugar for GetVar(variable_name, nullptr);
+  virtual bool HasVar(StringPiece variable_name);
+
+  // Returns true on success, otherwise returns false. This method should not
+  // be called in a multi-threaded process.
+  virtual bool SetVar(StringPiece variable_name,
+                      const std::string& new_value) = 0;
+
+  // Returns true on success, otherwise returns false. This method should not
+  // be called in a multi-threaded process.
+  virtual bool UnSetVar(StringPiece variable_name) = 0;
+};
+
+#if defined(OS_WIN)
+using NativeEnvironmentString = std::wstring;
+#elif defined(OS_POSIX) || defined(OS_FUCHSIA)
+using NativeEnvironmentString = std::string;
+#endif
+using EnvironmentMap =
+    std::map<NativeEnvironmentString, NativeEnvironmentString>;
+
+}  // namespace base
+
+#endif  // BASE_ENVIRONMENT_H_