gecko-dev/xpcom/io/nsIFastLoadService.idl

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: NPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Netscape Public License
 * Version 1.1 (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License at
 * http://www.mozilla.org/NPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Mozilla FastLoad code.
 *
 * The Initial Developer of the Original Code is 
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 2001
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Brendan Eich <brendan@mozilla.org> (original author)
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or 
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the NPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the NPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

#include "nsISupports.idl"
#include "nsrootidl.idl"

interface nsIFastLoadReadControl;
interface nsIFile;
interface nsIInputStream;
interface nsIOutputStream;
interface nsIObjectInputStream;
interface nsIObjectOutputStream;

[scriptable, uuid(715577db-d9c5-464a-a32e-0a40c29b22d4)]
interface nsIFastLoadFileIO : nsISupports
{
    readonly attribute nsIInputStream  inputStream;
    readonly attribute nsIOutputStream outputStream;
};

[scriptable, uuid(759e475e-0c23-4dbf-b1b8-78c9369e3072)]
interface nsIFastLoadService : nsISupports
{
    nsIFile newFastLoadFile(in string aBaseName);

    nsIObjectInputStream  newInputStream(in nsIInputStream aSrcStream);
    nsIObjectOutputStream newOutputStream(in nsIOutputStream aDestStream);

    // Flag values for the direction attribute and the aDirectionFlags
    // parameter to startMuxedDocument.
    const PRInt32 NS_FASTLOAD_READ = 1;
    const PRInt32 NS_FASTLOAD_WRITE = 2;

    attribute nsIObjectInputStream  inputStream;
    attribute nsIObjectOutputStream outputStream;
    attribute nsIFastLoadFileIO     fileIO;
    readonly attribute PRInt32      direction;

    /**
     * These methods associate a URI object with its spec, for faster select
     * using the object pointer as a key, rather than the spec string.  The
     * selectMuxedDocument method returns the previously selected URI object,
     * in case a caller needs to reselect the previous after muxing data for
     * a given URI synchronously.  For the non-blocking or "asynchronous" i/o
     * case, the caller must select the source URI from the FastLoad multiplex
     * before writing a new burst of data parsed from the slow-loaded source.
     *
     * Clients of inputStream and outputStream should try to demultiplex data
     * from the input stream only if fastLoadService->StartMuxedDocument(uri,
     * urispec, NS_FASTLOAD_READ) succeeds.  If StartMuxedDocument fails with
     * NS_ERROR_NOT_AVAILABLE, callers should slow-load the documents, muxing
     * their data to the current output stream.
     */
    void        startMuxedDocument(in nsISupports aURI,
                                   in string aURISpec,
                                   in PRInt32 aDirectionFlags);
    nsISupports selectMuxedDocument(in nsISupports aURI);
    void        endMuxedDocument(in nsISupports aURI);

    void        addDependency(in nsIFile aFile);

    PRUint32    computeChecksum(in nsIFile aFile,
                                in nsIFastLoadReadControl aControl);
    void        cacheChecksum(in nsIFile aFile,
                              in nsIObjectOutputStream aStream);

    [noscript] void getFastLoadReferent(inout nsISupports aPtr);

    [noscript] void readFastLoadPtr(in nsIObjectInputStream aInputStream,
                                    inout nsISupports aPtr);

    [noscript] void writeFastLoadPtr(in nsIObjectOutputStream aOutputStream,
                                     in nsISupports aPtr);

    /**
     * Return true if aURISpec identifies a muxed document in the FastLoad
     * file, false otherwise.
     */
    boolean     hasMuxedDocument(in string aURISpec);
};

%{C++
#define NS_FASTLOADSERVICE_CLASSNAME "Mozilla FastLoad Service"

#define NS_FASTLOADSERVICE_CID \
    {0xc943093c,0xac94,0x4bee,{0x84,0x0b,0x8b,0x5a,0x6e,0x31,0x4f,0xa7}}

#define NS_FASTLOADSERVICE_CONTRACTID \
    "@mozilla.org/fast-load-service;1"

#ifndef nsCOMPtr_h___
# include "nsCOMPtr.h"
#endif
#ifndef __gen_nsIFile_h__
# include "nsIFile.h"
#endif
#ifndef nsIServiceManager_h___
# include "nsIServiceManager.h"
#endif

inline const nsGetServiceByCID
do_GetFastLoadService(nsresult *aResultCode = 0)
{
    static NS_DEFINE_CID(kFastLoadServiceCID, NS_FASTLOADSERVICE_CID);
    return nsGetServiceByCID(kFastLoadServiceCID, nsnull, aResultCode);
}

inline nsresult
NS_AddFastLoadDependency(nsIFile* aFile)
{
    nsCOMPtr<nsIFastLoadService> fastLoadService(do_GetFastLoadService());
    if (fastLoadService) {
        nsresult rv = fastLoadService->AddDependency(aFile);
        if (NS_FAILED(rv) && rv != NS_ERROR_NOT_AVAILABLE)
            return rv;
    }
    return NS_OK;
}

%}