Line data    Source code

       1             : /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
       2             : /*
       3             :  * Version: MPL 1.1 / GPLv3+ / LGPLv3+
       4             :  *
       5             :  * The contents of this file are subject to the Mozilla Public License Version
       6             :  * 1.1 (the "License"); you may not use this file except in compliance with
       7             :  * the License. You may obtain a copy of the License at
       8             :  * http://www.mozilla.org/MPL/
       9             :  *
      10             :  * Software distributed under the License is distributed on an "AS IS" basis,
      11             :  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
      12             :  * for the specific language governing rights and limitations under the
      13             :  * License.
      14             :  *
      15             :  * The Initial Developer of the Original Code is
      16             :  *       [ Surendran Mahendran <surenspost@gmail.com>]
      17             :  *
      18             :  * Alternatively, the contents of this file may be used under the terms of
      19             :  * either the GNU General Public License Version 3 or later (the "GPLv3+"), or
      20             :  * the GNU Lesser General Public License Version 3 or later (the "LGPLv3+"),
      21             :  * in which case the provisions of the GPLv3+ or the LGPLv3+ are applicable
      22             :  * instead of those above.
      23             :  */
      24             : 
      25             : #include "sal/config.h"
      26             : 
      27             : #include "svtools/filechangedchecker.hxx"
      28             : 
      29           0 : FileChangedChecker::FileChangedChecker(const rtl::OUString& rFilename, const ::boost::function0<void>& rCallback) :
      30             :     mTimer(),
      31             :     mFileName(rFilename),
      32             :     mLastModTime(),
      33           0 :     mpCallback(rCallback)
      34             : {
      35             :     // Get the curren last file modified Status
      36           0 :     getCurrentModTime(mLastModTime);
      37             : 
      38             :     // associate the callback function for the timer
      39           0 :     mTimer.SetTimeoutHdl(LINK(this, FileChangedChecker, TimerHandler));
      40             : 
      41             :     //start the timer
      42           0 :     resetTimer();
      43           0 : }
      44             : 
      45           0 : void FileChangedChecker::resetTimer()
      46             : {
      47             :     //Start the timer if its not active
      48           0 :     if(!mTimer.IsActive())
      49           0 :         mTimer.Start();
      50             : 
      51             :     // Set a timeout of 3 seconds
      52           0 :     mTimer.SetTimeout(3000);
      53           0 : }
      54             : 
      55           0 : bool FileChangedChecker::getCurrentModTime(TimeValue& o_rValue) const
      56             : {
      57             :     // Need a Directory item to fetch file status
      58           0 :     osl::DirectoryItem aItem;
      59           0 :     osl::DirectoryItem::get(mFileName, aItem);
      60             : 
      61             :     // Retrieve the status - we are only interested in last File
      62             :     // Modified time
      63           0 :     osl::FileStatus aStatus( osl_FileStatus_Mask_ModifyTime );
      64           0 :     if( osl::FileBase::E_None != aItem.getFileStatus(aStatus) )
      65           0 :         return false;
      66             : 
      67           0 :     o_rValue = aStatus.getModifyTime();
      68           0 :     return true;
      69             : }
      70             : 
      71           0 : bool FileChangedChecker::hasFileChanged()
      72             : {
      73             :     // Get the current file Status
      74           0 :     TimeValue newTime={0,0};
      75           0 :     if( !getCurrentModTime(newTime) )
      76           0 :         return true; // well. hard to answer correctly here ...
      77             : 
      78             :     // Check if the seconds time stamp has any difference
      79             :     // If so, then our file has changed meanwhile
      80           0 :     if( newTime.Seconds != mLastModTime.Seconds ||
      81             :         newTime.Nanosec != mLastModTime.Nanosec )
      82             :     {
      83             :         // Since the file has changed, set the new status as the file status and
      84             :         // return True
      85           0 :         mLastModTime = newTime ;
      86             : 
      87           0 :         return true;
      88             :     }
      89             :     else
      90           0 :         return false;
      91             : }
      92             : 
      93           0 : IMPL_LINK_NOARG(FileChangedChecker, TimerHandler)
      94             : {
      95             :     // If the file has changed, then update the graphic in the doc
      96             :     OSL_TRACE("Timeout Called");
      97           0 :     if(hasFileChanged())
      98             :     {
      99             :         OSL_TRACE("File modified");
     100           0 :         mpCallback();
     101             :     }
     102             : 
     103             :     // Reset the timer in any case
     104           0 :     resetTimer();
     105           0 :     return 0;
     106             : }
     107             : 
     108             : /* vim:set shiftwidth=4 softtabstop=4 expandtab: */