WORK AROUND
Name: tn108358 Date: 05/15/2001
well when the error occurs you can click on cancel or continue. eventually the
filechooser pops up and works correctly....
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There is an workaround by Steve:
// This class is necessary due to an annoying bug on Windows NT where
// instantiating a JFileChooser with the default FileSystemView will
// cause a "drive A: not ready" error every time. I grabbed the
// Windows FileSystemView impl from the 1.3 SDK and modified it so
// as to not use java.io.File.listRoots() to get fileSystem roots.
// java.io.File.listRoots() does a SecurityManager.checkRead() which
// causes the OS to try to access drive A: even when there is no disk,
// causing an annoying "abort, retry, ignore" popup message every time
// we instantiate a JFileChooser!
//
// Instead of calling listRoots() we use a straightforward alternate
// method of getting file system roots.
import javax.swing.filechooser.*;
import java.io.*;
import java.util.*;
import java.lang.reflect.Method;
class WindowsAltFileSystemView extends FileSystemView {
private static final Object[] noArgs = {};
private static final Class[] noArgTypes = {};
private static Method listRootsMethod = null;
private static boolean listRootsMethodChecked = false;
/**
* Returns true if the given file is a root.
*/
public boolean isRoot(File f) {
if(!f.isAbsolute()) {
return false;
}
String parentPath = f.getParent();
if(parentPath == null) {
return true;
} else {
File parent = new File(parentPath);
return parent.equals(f);
}
}
/**
* creates a new folder with a default folder name.
*/
public File createNewFolder(File containingDir) throws IOException {
if(containingDir == null) {
throw new IOException("Containing directory is null:");
}
File newFolder = null;
// Using NT's default folder name
newFolder = createFileObject(containingDir, "New Folder");
int i = 2;
while (newFolder.exists() && (i < 100)) {
newFolder = createFileObject(containingDir, "New Folder (" + i + ")");
i++;
}
if(newFolder.exists()) {
throw new IOException("Directory already exists:" + newFolder.getAbsolutePath());
} else {
newFolder.mkdirs();
}
return newFolder;
}
/**
* Returns whether a file is hidden or not. On Windows
* there is currently no way to get this information from
* io.File, therefore always return false.
*/
public boolean isHiddenFile(File f) {
return false;
}
/**
* Returns all root partitians on this system. On Windows, this
* will be the A: through Z: drives.
*/
public File[] getRoots() {
Vector rootsVector = new Vector();
// Create the A: drive whether it is mounted or not
FileSystemRoot floppy = new FileSystemRoot("A" + ":"
+ "\\");
rootsVector.addElement(floppy);
// Run through all possible mount points and check
// for their existance.
for (char c = 'C'; c <= 'Z'; c++) {
char device[] = {c, ':', '\\'};
String deviceName = new String(device);
File deviceFile = new FileSystemRoot(deviceName);
if (deviceFile != null && deviceFile.exists()) {
rootsVector.addElement(deviceFile);
}
}
File[] roots = new File[rootsVector.size()];
rootsVector.copyInto(roots);
return roots;
// }
// return null;
}
class FileSystemRoot extends File {
public FileSystemRoot(File f) {
super(f, "");
}
public FileSystemRoot(String s) {
super(s);
}
public boolean isDirectory() {
return true;
}
}
}
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