@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);
}
private FileChannel getFileChannel() throws IOException {
int id = (int) (filePointer / maxLength);
while (id >= list.length) {
int i = list.length;
FileChannel[] newList = new FileChannel[i + 1];
System.arraycopy(list, 0, newList, 0, i);
FilePath f = file.getBase(i);
newList[i] = f.open(mode);
list = newList;
}
return list[id];
}
/**
* Create a new temporary file.
*
* @param suffix the suffix
* @param deleteOnExit if the file should be deleted when the virtual machine exists
* @param inTempDir if the file should be stored in the temporary directory
* @return the name of the created file
*/
public FilePath createTempFile(String suffix, boolean deleteOnExit, boolean inTempDir)
throws IOException {
while (true) {
FilePath p = getPath(name + getNextTempFileNamePart(false) + suffix);
if (p.exists() || !p.createFile()) {
// in theory, the random number could collide
getNextTempFileNamePart(true);
continue;
}
p.open("rw").close();
return p;
}
}
/**
* 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);
}
}
public FileChannel open(String mode) throws IOException {
ArrayList<FileChannel> list = New.arrayList();
list.add(getBase().open(mode));
for (int i = 1; ; i++) {
FilePath f = getBase(i);
if (f.exists()) {
list.add(f.open(mode));
} else {
break;
}
}
FileChannel[] array = new FileChannel[list.size()];
list.toArray(array);
long maxLength = array[0].size();
long length = maxLength;
if (array.length == 1) {
long defaultMaxLength = getDefaultMaxLength();
if (maxLength < defaultMaxLength) {
maxLength = defaultMaxLength;
}
} else {
if (maxLength == 0) {
closeAndThrow(0, array, array[0], maxLength);
}
for (int i = 1; i < array.length - 1; i++) {
FileChannel c = array[i];
long l = c.size();
length += l;
if (l != maxLength) {
closeAndThrow(i, array, c, maxLength);
}
}
FileChannel c = array[array.length - 1];
long l = c.size();
length += l;
if (l > maxLength) {
closeAndThrow(array.length - 1, array, c, maxLength);
}
}
return new FileSplit(this, mode, array, length, maxLength);
}