/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*************************************************************************
 *
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * Copyright 2000, 2010 Oracle and/or its affiliates.
 *
 * OpenOffice.org - a multi-platform office productivity suite
 *
 * This file is part of OpenOffice.org.
 *
 * OpenOffice.org is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License version 3
 * only, as published by the Free Software Foundation.
 *
 * OpenOffice.org is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License version 3 for more details
 * (a copy is included in the LICENSE file that accompanied this code).
 *
 * You should have received a copy of the GNU Lesser General Public License
 * version 3 along with OpenOffice.org.  If not, see
 * <http://www.openoffice.org/license.html>
 * for a copy of the LGPLv3 License.
 *
 ************************************************************************/

/* Information:
 * This class implements a mechanism to lock a users installation directory,
 * which is necessesary because instances of staroffice could be running on
 * different hosts while using the same directory thus causing data
 * inconsistency.
 * When an existing lock is detected, the user will be asked whether he wants
 * to continue anyway, thus removing the lock and replacing it with a new one
 *
 * ideas:
 * - store information about user and host and time in the lockfile and display
 * these when asking whether to remove the lockfile.
 * - periodically check the lockfile and warn the user when it gets replaced
 *
 */

#include "sal/types.h"
#include "rtl/ustring.hxx"

class ByteString;

#define LOCKFILE_SUFFIX   rtl::OUString( RTL_CONSTASCII_USTRINGPARAM( "/.lock" ) )
#define LOCKFILE_GROUP    ByteString( "Lockdata" )
#define LOCKFILE_USERKEY  ByteString( "User" )
#define LOCKFILE_HOSTKEY  ByteString( "Host" )
#define LOCKFILE_STAMPKEY ByteString( "Stamp" )
#define LOCKFILE_TIMEKEY  ByteString( "Time" )
#define LOCKFILE_IPCKEY   ByteString( "IPCServer" )

namespace desktop {

    class Lockfile;
    bool Lockfile_execWarning( Lockfile * that );

    class Lockfile
    {
    public:

        // contructs a new lockfile onject
        Lockfile( bool bIPCserver = true );

        // separating GUI code:
        typedef bool (* fpExecWarning)( Lockfile * that );

        // checks the lockfile, asks user when lockfile is
        // found (iff gui) and returns false when we may not continue
        sal_Bool check( fpExecWarning execWarning );

        // removes the lockfile. should only be called in exceptional situations
        void clean(void);

        // removes the lockfile
        ~Lockfile(void);

    private:
        bool m_bIPCserver;
        // full qualified name (file://-url) of the lockfile
        rtl::OUString m_aLockname;
        // flag whether the d'tor should delete the lock
        sal_Bool m_bRemove;
        sal_Bool m_bIsLocked;
        // ID
        rtl::OUString m_aId;
        rtl::OUString m_aDate;
        // access to data in file
        void syncToFile(void) const;
        sal_Bool isStale(void) const;
        friend bool Lockfile_execWarning( Lockfile * that );

    };

}

/* vim:set shiftwidth=4 softtabstop=4 expandtab: */