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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsISupports.idl"
+
+/**
+ * Scriptable access to the current process environment.
+ *
+ */
+[scriptable, uuid(101d5941-d820-4e85-a266-9a3469940807)]
+interface nsIEnvironment : nsISupports
+{
+ /**
+ * Set the value of an environment variable.
+ *
+ * @param aName the variable name to set.
+ * @param aValue the value to set.
+ */
+ void set(in AString aName, in AString aValue);
+
+ /**
+ * Get the value of an environment variable.
+ *
+ * @param aName the variable name to retrieve.
+ * @return returns the value of the env variable. An empty string
+ * will be returned when the env variable does not exist or
+ * when the value itself is an empty string - please use
+ * |exists()| to probe whether the env variable exists
+ * or not.
+ */
+ AString get(in AString aName);
+
+ /**
+ * Check the existence of an environment variable.
+ * This method checks whether an environment variable is present in
+ * the environment or not.
+ *
+ * - For Unix/Linux platforms we follow the Unix definition:
+ * An environment variable exists when |getenv()| returns a non-NULL value.
+ * An environment variable does not exist when |getenv()| returns NULL.
+ * - For non-Unix/Linux platforms we have to fall back to a
+ * "portable" definition (which is incorrect for Unix/Linux!!!!)
+ * which simply checks whether the string returned by |Get()| is empty
+ * or not.
+ *
+ * @param aName the variable name to probe.
+ * @return if the variable has been set, the value returned is
+ * PR_TRUE. If the variable was not defined in the
+ * environment PR_FALSE will be returned.
+ */
+ boolean exists(in AString aName);
+};