public Directory getLastDirectory(String path, Directory currentDir, User currentUser)
throws FileUnknownException, PathIsTooBigException, AccessDeniedException {
if (path.equals("/")) {
getSlash().checkAccessEx(currentUser);
return getSlash();
}
if (path.equals(".")) return currentDir;
else if (path.equals("..")) {
currentDir.getFather().checkAccessEx(currentUser);
return currentDir.getFather();
}
Directory beforeLast = absolutePath(path, currentUser, currentDir);
String[] tokens = path.split(PATH_DELIM);
String name = tokens.length == 0 ? path : tokens[tokens.length - 1];
beforeLast.checkAccessEx(currentUser);
beforeLast.changeDirectory(name, currentUser);
return (Directory) beforeLast.getFileByName(name);
}
Directory absolutePath(String path, User currentUser, Directory currentDirectory)
throws FileUnknownException, PathIsTooBigException {
String resultantPath;
if (path.equals(PATH_DELIM)) {
return getFsRoot();
} else if (path.startsWith(PATH_DELIM)) {
resultantPath = path;
} else {
resultantPath =
currentDirectory.getPath().equals(PATH_DELIM)
? currentDirectory.getPath() + path
: currentDirectory.getPath() + PATH_DELIM + path;
}
if ((resultantPath.length() > MAX_PATH_SIZE)) {
throw new PathIsTooBigException(path);
}
Directory directory = getSlash();
String[] fileLocation = resultantPath.split(PATH_DELIM);
for (int i = 1; i < (fileLocation.length - 1); i++)
directory = changeDirectory(fileLocation[i], directory, getRoot());
directory.checkAccessEx(currentUser);
return directory;
}
private Directory changeDirectory(
String directoryName, Directory currentDirectory, User currentUser)
throws FileUnknownException, AccessDeniedException {
currentDirectory.checkAccessEx(currentUser);
return currentDirectory.changeDirectory(directoryName, currentUser);
}