protected String checkPointName(File name) {
String path = name.getPath();
int pos = path.lastIndexOf(File.separatorChar);
String start = path.substring(0, pos + 1);
String finish = path.substring(pos + 1);
return start + "checkPoint-" + finish;
}
@Override
public void begin() {
if (inTransaction) throw new JenaException("nested transactions not supported");
else {
checkPointFile = new File(checkPointName(fileGraph.name));
checkPointFile.deleteOnExit();
fileGraph.saveContents(checkPointFile);
inTransaction = true;
}
}
@Override
public void commit() {
fileGraph.saveContents(fileGraph.name);
checkPointFile.delete();
inTransaction = false;
}