/**
   * @brief Load auctions from a save file, with a pretty splash screen and everything, if
   *     necessary.
   *     <p>I'd like to abstract this, and make it work with arbitrary streams, so that we could
   *     send an XML file of auctions over a network to sync between JBidwatcher instances.
   */
  public void loadAuctions() {
    XMLElement xmlFile = new XMLElement(true);
    String loadFile = JConfig.queryConfiguration("savefile", "auctions.xml");
    String oldLoad = loadFile;

    loadFile = JConfig.getCanonicalFile(loadFile, "jbidwatcher", true);
    if (!loadFile.equals(oldLoad)) {
      JConfig.setConfiguration("savefile", loadFile);
    }

    File toLoad = new File(loadFile);
    if (toLoad.exists() && toLoad.length() != 0) {
      try {
        loadXMLFromFile(loadFile, xmlFile);
      } catch (IOException ioe) {
        JConfig.log()
            .handleException("A serious problem occurred trying to load from auctions.xml.", ioe);
        MQFactory.getConcrete("Swing")
            .enqueue(
                "ERROR Failure to load your saved auctions.  Some or all items may be missing.");
      } catch (XMLParseException xme) {
        JConfig.log().handleException("Trying to load from auctions.xml.", xme);
        MQFactory.getConcrete("Swing")
            .enqueue(
                "ERROR Failure to load your saved auctions.  Some or all items may be missing.");
      }
    } else {
      //  This is a common thing, and we don't want to frighten new
      //  users, who are most likely to see it.
      JConfig.log()
          .logDebug(
              "JBW: Failed to load saved auctions, the auctions file is probably not there yet.");
      JConfig.log().logDebug("JBW: This is not an error, unless you're constantly getting it.");
    }
  }
  private static void preserveFiles(String filename) {
    File oldFile = new File(filename);
    File saveFile = new File(filename + ".temp");
    SimpleDateFormat sdf = new SimpleDateFormat("ddMMMyy_HHmm");
    String nowStr = sdf.format(new Date());
    String retainFilename = makeBackupFilename(filename, nowStr);
    File retainFile = new File(retainFilename);
    if (retainFile.exists()) retainFile.delete();

    String oldestSave = JConfig.queryConfiguration("save.file.4", "");
    if (oldestSave.length() != 0) {
      File oldest = new File(oldestSave);
      if (oldest.exists()) {
        backupByDate(filename, oldest);
      }
    }

    for (int i = 4; i > 0; i--) {
      JConfig.setConfiguration(
          "save.file." + i, JConfig.queryConfiguration("save.file." + (i - 1), ""));
    }

    File keepFile = new File(retainFilename);
    if (!oldFile.renameTo(keepFile)) {
      JConfig.log()
          .logDebug(
              "Renaming the old file ("
                  + oldFile
                  + ") to the retain file ("
                  + keepFile
                  + ") failed!");
    }
    JConfig.setConfiguration("save.file.0", retainFilename);

    File standard = new File(filename);
    if (!saveFile.renameTo(standard)) {
      JConfig.log()
          .logDebug(
              "Renaming the new file ("
                  + saveFile
                  + ") to the standard filename ("
                  + standard
                  + ") failed!");
    }
  }
  /**
   * @brief Save auctions out to the savefile, in XML format.
   *     <p>Similar to the loadAuctions code, this would be nice if it were abstracted to write to
   *     any outputstream, allowing us to write to a remote node to update it with our auctions and
   *     snipes.
   * @return - true if it successfully saved, false if an error occurred.
   */
  public boolean saveAuctions() {
    XMLElement auctionsData = AuctionServerManager.getInstance().toXML();
    String oldSave = JConfig.queryConfiguration("savefile", "auctions.xml");
    String saveFilename =
        JConfig.getCanonicalFile(
            JConfig.queryConfiguration("savefile", "auctions.xml"), "jbidwatcher", false);
    String newSave = saveFilename;

    //  If there's no data to save, then pretend we did it.
    if (auctionsData == null) return true;

    ensureDirectories(saveFilename);

    boolean swapFiles = needSwapSaves(saveFilename);

    if (!saveFilename.equals(oldSave)) {
      JConfig.setConfiguration("savefile", saveFilename);
    }

    //  If we already have a save file, preserve its name, and write
    //  the new one to '.temp'.
    if (swapFiles) {
      newSave = saveFilename + ".temp";
      File newSaveFile = new File(newSave);
      if (newSaveFile.exists()) newSaveFile.delete();
    }

    StringBuffer buf = buildSaveBuffer(auctionsData, null);
    boolean saveDone = true;

    //  Dump the save file out!
    try {
      PrintStream ps = new PrintStream(new FileOutputStream(newSave));
      ps.println(buf);
      ps.close();
    } catch (IOException e) {
      JConfig.log().handleException("Failed to save auctions.", e);
      saveDone = false;
    }

    //  If the save was complete, and we have to swap old/new files,
    //  then [remove prior '.old' file if necessary], save current XML
    //  as '.old', and move most recent save file to be just a normal
    //  save file.
    if (saveDone && swapFiles) {
      preserveFiles(saveFilename);
    }

    return saveDone;
  }
 private static void backupByDate(String filename, File oldest) {
   SimpleDateFormat justDateFmt = new SimpleDateFormat("ddMMMyy");
   String justDate = justDateFmt.format(new Date());
   String oldBackup = makeBackupFilename(filename, justDate);
   File oldDateBackup = new File(oldBackup);
   if (oldDateBackup.exists()) {
     oldDateBackup.delete();
     File newDateBackup = new File(oldBackup);
     oldest.renameTo(newDateBackup);
   } else {
     oldest.renameTo(oldDateBackup);
     String oldestByDate = JConfig.queryConfiguration("save.bydate.4", "");
     for (int i = 4; i > 0; i--) {
       JConfig.setConfiguration(
           "save.bydate." + i, JConfig.queryConfiguration("save.bydate." + (i - 1), ""));
     }
     JConfig.setConfiguration("save.bydate.0", oldBackup);
     File deleteMe = new File(oldestByDate);
     deleteMe.delete();
   }
 }
 private static boolean needSwapSaves(String saveName) {
   File oldFile = new File(saveName);
   return oldFile.exists();
 }
 private static void ensureDirectories(String saveFilename) {
   //  Thanks to Gabor Liptak for this recommendation...
   File saveParent = new File(saveFilename);
   saveParent = saveParent.getParentFile();
   if (!saveParent.exists()) saveParent.mkdirs(); //  This can fail, but we don't mind.
 }