// Loosely based on the workaround posted here:
// http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4993360
// XXX why isn't this in Apache Commons?
public static boolean isFileWritable(File file) {
boolean isWritable = false;
if (file != null) {
boolean fileAlreadyExists = file.isFile(); // i.e. exists and is a File
if (fileAlreadyExists || !file.exists()) {
try {
// true: open for append: make sure the open
// doesn't clobber the file
new FileOutputStream(file, true).close();
isWritable = true;
if (!fileAlreadyExists) { // a new file has been "touch"ed; try to remove it
try {
if (!file.delete()) {
LOGGER.warn("Can't delete temporary test file: {}", file.getAbsolutePath());
}
} catch (SecurityException se) {
LOGGER.error("Error deleting temporary test file: " + file.getAbsolutePath(), se);
}
}
} catch (IOException | SecurityException ioe) {
}
}
}
return isWritable;
}
// XXX dir.canWrite() has issues on Windows, so verify it directly:
// http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6203387
public static boolean isDirectoryWritable(File dir) {
boolean isWritable = false;
if (dir != null) {
// new File("").isDirectory() is false, even though getAbsolutePath() returns the right path.
// this resolves it
dir = dir.getAbsoluteFile();
if (dir.isDirectory()) {
File file =
new File(
dir,
String.format(
"pms_directory_write_test_%d_%d.tmp",
System.currentTimeMillis(), Thread.currentThread().getId()));
try {
if (file.createNewFile()) {
if (isFileWritable(file)) {
isWritable = true;
}
if (!file.delete()) {
LOGGER.warn("Can't delete temporary test file: {}", file.getAbsolutePath());
}
}
} catch (IOException | SecurityException ioe) {
}
}
}
return isWritable;
}