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