/**
* Try to open the file.
*
* @param fileName the file name
* @param readOnly whether the file should only be opened in read-only mode, even if the file is
* writable
* @param encryptionKey the encryption key, or null if encryption is not used
*/
public void open(String fileName, boolean readOnly, char[] encryptionKey) {
if (file != null) {
return;
}
if (fileName != null) {
FilePath p = FilePath.get(fileName);
// if no explicit scheme was specified, NIO is used
if (p instanceof FilePathDisk && !fileName.startsWith(p.getScheme() + ":")) {
// ensure the NIO file system is registered
FilePathNio.class.getName();
fileName = "nio:" + fileName;
}
}
this.fileName = fileName;
FilePath f = FilePath.get(fileName);
FilePath parent = f.getParent();
if (parent != null && !parent.exists()) {
throw DataUtils.newIllegalArgumentException("Directory does not exist: {0}", parent);
}
if (f.exists() && !f.canWrite()) {
readOnly = true;
}
this.readOnly = readOnly;
try {
file = f.open(readOnly ? "r" : "rw");
if (encryptionKey != null) {
byte[] key = FilePathEncrypt.getPasswordBytes(encryptionKey);
encryptedFile = file;
file = new FilePathEncrypt.FileEncrypt(fileName, key, file);
}
file = FilePathCache.wrap(file);
try {
if (readOnly) {
fileLock = file.tryLock(0, Long.MAX_VALUE, true);
} else {
fileLock = file.tryLock();
}
} catch (OverlappingFileLockException e) {
throw DataUtils.newIllegalStateException(
DataUtils.ERROR_FILE_LOCKED, "The file is locked: {0}", fileName, e);
}
if (fileLock == null) {
throw DataUtils.newIllegalStateException(
DataUtils.ERROR_FILE_LOCKED, "The file is locked: {0}", fileName);
}
fileSize = file.size();
} catch (IOException e) {
throw DataUtils.newIllegalStateException(
DataUtils.ERROR_READING_FAILED, "Could not open file {0}", fileName, e);
}
}
@Override
public FileChannel open(String mode) throws IOException {
InputStream in = newInputStream();
FilePath copy = FilePath.get(getBase().toString() + ".copy");
OutputStream out = copy.newOutputStream(false);
IOUtils.copy(in, out);
FileChannel base = getBase().open(mode);
FileChannel readBase = copy.open(mode);
return new FileReorderWrites(this, base, readBase);
}
@Override
public FilePath unwrap(String fileName) {
return FilePath.get(parse(fileName)[1]);
}
/**
* Get the file name of a part file.
*
* @param id the part id
* @return the file name including the part id
*/
FilePath getBase(int id) {
return FilePath.get(getName(id));
}