Examples of BackupOutputStream

com.mucommander.io.backup.BackupOutputStream
Saves file in as crash-safe a manner as possible.
In order to prevent system or muCommander failures to corrupt configuration files, the BackupOutputStream implements the following algorithm:
- Write its content to a backup file instead of the requested file
- When close is called, copy the content of the backup file over the original file
This way, if a crash was to happen while configuration files are being saved, either of the following will happen:
- The backup file is not properly saved, but the original configuration is left untouched. We have lost some information (modifications since last save) but not all.
- The original file is not properly saved, but the backup file is correct. This is easy to check, as the backup and original file should always have the same size. If they don't, then the backup file should be used rather than the original one.
Files that have been saved by this class should be read with {@link BackupInputStream}in order to make sure that an uncorrupt version of them is loaded.

The BackupOutputStream monitors all of its own I/O operations. If an error occurs, then the backup operation will not be performed when {@link #close()} is called. It's possible to force the backup operation byusing the {@link #close(boolean)} method.
@see BackupInputStream @author Nicolas Rinaudo

Examples of com.mucommander.io.backup.BackupOutputStream

  private static final Logger LOGGER = LoggerFactory.getLogger(ActionKeymapWriter.class);
  
  ActionKeymapWriter() {}
  
  public void create() throws IOException {
    BackupOutputStream bos = new BackupOutputStream(getActionsFile());


    try {
      new Writer(bos).writeKeyMap(null);
    } catch (Exception e) {
      LOGGER.debug("Caught exception", e);
    } finally {
      bos.close();
    }
  }

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Examples of com.mucommander.io.backup.BackupOutputStream

      keyStrokes[1] = ActionKeymap.getAlternateAccelerator(actionId);


      combinedMapping.put(actionId, keyStrokes);
    }
    
    BackupOutputStream bos = new BackupOutputStream(getActionsFile());


    try {
      new Writer(bos).writeKeyMap(combinedMapping);
      wereActionsModified = false;
    } catch (Exception e) {
      LOGGER.debug("Caught exception", e);
    } finally {
      bos.close();
    }
  }

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Examples of com.mucommander.io.backup.BackupOutputStream

        // Write bookmarks file only if changes were made to the bookmarks since last write, or if write is forced.
        if(!(forceWrite || saveNeeded))
            return;
        out = null;
        try {
            buildBookmarks(getBookmarkWriter(out = new BackupOutputStream(getBookmarksFile())));
            saveNeeded = false;
        }
        finally {
            if(out != null) {
                try {out.close();}

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Examples of com.mucommander.io.backup.BackupOutputStream

    /**
     * Writes the shell history to hard drive.
     * @throws IOException if an I/O error occurs.
     */
    public static void writeHistory() throws IOException {
        BackupOutputStream out;


        out = null;
        try {ShellHistoryWriter.write(out = new BackupOutputStream(getHistoryFile()));}
        finally {
            if(out != null) {
                try {out.close();}
                catch(Exception e) {}
            }
        }
    }

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Examples of com.mucommander.io.backup.BackupOutputStream

    /**
     * Returns an output stream on the configuration file.
     * @return an output stream on the configuration file.
     */
    public synchronized Writer getWriter() throws IOException {
        return new OutputStreamWriter(new BackupOutputStream(getConfigurationFile()), Charset.forName("utf-8"));
    }

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Examples of com.mucommander.io.backup.BackupOutputStream

  private ToolBarWriter() {}
  
  void write() throws IOException {
    String[] actionIds = ToolBarAttributes.getActions();
    
    BackupOutputStream bos = new BackupOutputStream(getDescriptionFile());
    try {
      new Writer(bos).write(actionIds);
      wasToolBarModified = false;
    } catch (Exception e) {
      LOGGER.debug("Caught exception", e);
    } finally {
      bos.close();
    }
  }

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Examples of com.mucommander.io.backup.BackupOutputStream

  void write() throws IOException {
    String[] commandBarActionIds = CommandBarAttributes.getActions();
    String[] commandBarAlterativeActionIds = CommandBarAttributes.getAlternateActions();
    KeyStroke commandBarModifier = CommandBarAttributes.getModifier();


    BackupOutputStream bos = new BackupOutputStream(getDescriptionFile());


    try {
      new Writer(bos).write(commandBarActionIds, commandBarAlterativeActionIds, commandBarModifier);
      wasCommandBarModified = false;
    } catch (Exception e) {
      LOGGER.debug("Caught exception", e);
    } finally {
      bos.close();
    }
  }

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Examples of com.mucommander.io.backup.BackupOutputStream

     * @see                     #setAssociationFile(String)
     */
    public static void writeAssociations() throws CommandException, IOException {
        // Do not save the associations if they were not modified.
        if(wereAssociationsModified) {
            BackupOutputStream out;    // Where to write the associations.


            LOGGER.debug("Writing associations to file: " + getAssociationFile());


            // Writes the associations.
            out = null;
            try {
                buildAssociations(new AssociationWriter(out = new BackupOutputStream(getAssociationFile())));
                wereAssociationsModified = false;
            }
            finally {
                if(out != null) {
                    try {out.close();}
                    catch(Exception e) {
                        // Ignores this.
                    }
                }
            }

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Examples of com.mucommander.io.backup.BackupOutputStream

     * @see                     #setCommandFile(String)
     */
    public static void writeCommands() throws IOException, CommandException {
        // Only saves the command if they were modified since the last time they were written.
        if(wereCommandsModified) {
            BackupOutputStream out;    // Where to write the associations.


            LOGGER.debug("Writing custom commands to file: " + getCommandFile());


            // Writes the commands.
            out = null;
            try {
                buildCommands(new CommandWriter(out = new BackupOutputStream(getCommandFile())));
                wereCommandsModified = false;
            }
            finally {
                if(out != null) {
                    try {out.close();}
                    catch(Exception e) {
                        // Ignores this.
                    }
                }
            }

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Examples of com.mucommander.io.backup.BackupOutputStream

     * @param  name        name of the custom theme on which to open an output stream.
     * @return             an output stream on the specified custom theme.
     * @throws IOException if an I/O related error occurs.
     */
    private static BackupOutputStream getCustomThemeOutputStream(String name) throws IOException {
        return new BackupOutputStream(getCustomThemesFolder().getChild(name + ".xml"));
    }

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