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/* -*- Mode: C++; tab-width: 2; 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 "nsIProtocolHandler.idl"

/**
 * Protocol handler interface for the resource:// protocol
 */
[scriptable, uuid(067ca872-e947-4bd6-8946-a479cb6ba5dd)]
interface nsIResProtocolHandler : nsIProtocolHandler
{
    /**
     * Sets the substitution for the root key:
     *   resource://root/path ==> baseURI.resolve(path)
     *
     * A null baseURI removes the specified substitution.
     *
     * A root key should always be lowercase; however, this may not be
     * enforced.
     */
    void setSubstitution(in ACString root, in nsIURI baseURI);

    /**
     * Gets the substitution for the root key.
     *
     * @throws NS_ERROR_NOT_AVAILABLE if none exists.
     */
    nsIURI getSubstitution(in ACString root);

    /**
     * Returns TRUE if the substitution exists and FALSE otherwise.
     */
    boolean hasSubstitution(in ACString root);

    /**
     * Utility function to resolve a resource URI.  A resolved URI is not 
     * guaranteed to reference a resource that exists (ie. opening a channel to
     * the resolved URI may fail).
     *
     * @throws NS_ERROR_NOT_AVAILABLE if resURI.host() is an unknown root key.
     */
    AUTF8String resolveURI(in nsIURI resURI);
};