/**
* Open/creates file, returning FileChannel to access the file
*
* @param pathForWindows The path of the file to open/create
* @param pathToCheck The path used for permission checks (if security manager)
*/
static FileChannel newFileChannel(
String pathForWindows,
String pathToCheck,
Set<? extends OpenOption> options,
long pSecurityDescriptor)
throws WindowsException {
Flags flags = Flags.toFlags(options);
// default is reading; append => writing
if (!flags.read && !flags.write) {
if (flags.append) {
flags.write = true;
} else {
flags.read = true;
}
}
// validation
if (flags.read && flags.append) throw new IllegalArgumentException("READ + APPEND not allowed");
if (flags.append && flags.truncateExisting)
throw new IllegalArgumentException("APPEND + TRUNCATE_EXISTING not allowed");
FileDescriptor fdObj = open(pathForWindows, pathToCheck, flags, pSecurityDescriptor);
return FileChannelImpl.open(fdObj, pathForWindows, flags.read, flags.write, flags.append, null);
}
/**
* Open/creates file, returning AsynchronousFileChannel to access the file
*
* @param pathForWindows The path of the file to open/create
* @param pathToCheck The path used for permission checks (if security manager)
* @param pool The thread pool that the channel is associated with
*/
static AsynchronousFileChannel newAsynchronousFileChannel(
String pathForWindows,
String pathToCheck,
Set<? extends OpenOption> options,
long pSecurityDescriptor,
ThreadPool pool)
throws IOException {
Flags flags = Flags.toFlags(options);
// Overlapped I/O required
flags.overlapped = true;
// default is reading
if (!flags.read && !flags.write) {
flags.read = true;
}
// validation
if (flags.append) throw new UnsupportedOperationException("APPEND not allowed");
// open file for overlapped I/O
FileDescriptor fdObj;
try {
fdObj = open(pathForWindows, pathToCheck, flags, pSecurityDescriptor);
} catch (WindowsException x) {
x.rethrowAsIOException(pathForWindows);
return null;
}
// create the AsynchronousFileChannel
try {
return WindowsAsynchronousFileChannelImpl.open(fdObj, flags.read, flags.write, pool);
} catch (IOException x) {
// IOException is thrown if the file handle cannot be associated
// with the completion port. All we can do is close the file.
long handle = fdAccess.getHandle(fdObj);
CloseHandle(handle);
throw x;
}
}
static Flags toFlags(Set<? extends OpenOption> options) {
Flags flags = new Flags();
for (OpenOption option : options) {
if (option instanceof StandardOpenOption) {
switch ((StandardOpenOption) option) {
case READ:
flags.read = true;
break;
case WRITE:
flags.write = true;
break;
case APPEND:
flags.append = true;
break;
case TRUNCATE_EXISTING:
flags.truncateExisting = true;
break;
case CREATE:
flags.create = true;
break;
case CREATE_NEW:
flags.createNew = true;
break;
case DELETE_ON_CLOSE:
flags.deleteOnClose = true;
break;
case SPARSE:
flags.sparse = true;
break;
case SYNC:
flags.sync = true;
break;
case DSYNC:
flags.dsync = true;
break;
default:
throw new UnsupportedOperationException();
}
continue;
}
if (option instanceof ExtendedOpenOption) {
switch ((ExtendedOpenOption) option) {
case NOSHARE_READ:
flags.shareRead = false;
break;
case NOSHARE_WRITE:
flags.shareWrite = false;
break;
case NOSHARE_DELETE:
flags.shareDelete = false;
break;
default:
throw new UnsupportedOperationException();
}
continue;
}
if (option == LinkOption.NOFOLLOW_LINKS) {
flags.noFollowLinks = true;
continue;
}
if (option == OPEN_REPARSE_POINT) {
flags.openReparsePoint = true;
continue;
}
if (option == null) throw new NullPointerException();
throw new UnsupportedOperationException();
}
return flags;
}