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/* -*- Mode: C++; tab-width: 4; 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"

interface nsIFile;

[scriptable, uuid(1fb25bd5-4354-4dcd-8d97-621b7b3ed2e4)]
interface nsIFileProtocolHandler : nsIProtocolHandler
{
    /**
     * This method constructs a new file URI 
     *
     * @param aFile nsIFile
     * @return reference to a new nsIURI object
     */
    nsIURI newFileURI(in nsIFile aFile);

    /**
     * Converts the nsIFile to the corresponding URL string.  NOTE: under
     * some platforms this is a lossy conversion (e.g., Mac Carbon build).
     * If the nsIFile is a local file, then the result will be a file://
     * URL string.
     *
     * The resulting string may contain URL-escaped characters.
     * NOTE: Callers should use getURLSpecFromActualFile or
     * getURLSpecFromDirFile if possible, for performance reasons.
     */
    AUTF8String getURLSpecFromFile(in nsIFile file);

    /**
     * Converts the nsIFile to the corresponding URL string. Should
     * only be called on files which are not directories. Otherwise
     * identical to getURLSpecFromFile, but is usually more efficient.
     * WARNING: This restriction may not be enforced at runtime! 
     */
    AUTF8String getURLSpecFromActualFile(in nsIFile file);

    /**
     * Converts the nsIFile to the corresponding URL string. Should
     * only be called on files which are directories. Otherwise
     * identical to getURLSpecFromFile, but is usually more efficient.
     * WARNING: This restriction may not be enforced at runtime! 
     */
    AUTF8String getURLSpecFromDir(in nsIFile file);

    /**
     * Converts the URL string into the corresponding nsIFile if possible.
     * A local file will be created if the URL string begins with file://.
     */
    nsIFile getFileFromURLSpec(in AUTF8String url);

    /**
     * Takes a local file and tries to interpret it as an internet shortcut
     * (e.g. .url files on windows).
     * @param file The local file to read
     * @return The URI the file refers to
     *
     * @throw NS_ERROR_NOT_AVAILABLE if the OS does not support such files.
     * @throw NS_ERROR_NOT_AVAILABLE if this file is not an internet shortcut.
     */
    nsIURI readURLFile(in nsIFile file);
};