/**
* @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.");
}
}
/**
* @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 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!");
}
}
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.
}