/**
* 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;
}
}
