private static boolean mv0(
final java.io.File src, final java.io.File dst, final ArchiveDetector detector) {
boolean ok = true;
if (src.isDirectory()) {
final long srcLastModified = src.lastModified();
final boolean srcIsArchived = src instanceof File && ((File) src).getInnerArchive() != null;
final boolean dstIsArchived = dst instanceof File && ((File) dst).getInnerArchive() != null;
final boolean srcIsGhost = srcIsArchived && srcLastModified <= 0;
if (!srcIsGhost || !dstIsArchived || !File.isLenient()) dst.mkdir();
final String[] members = src.list();
if (!srcIsArchived && dstIsArchived) {
// Create sorted entries if writing a new archive file.
// This is courtesy only, so natural order is sufficient.
Arrays.sort(members);
}
for (int i = 0, l = members.length; i < l; i++) {
final String member = members[i];
ok &= mv0(detector.createFile(src, member), detector.createFile(dst, member), detector);
}
if (!srcIsGhost) ok &= dst.setLastModified(srcLastModified);
} else if (src.isFile()) { // !isDirectory()
try {
cp(true, src, dst);
} catch (IOException ex) {
ok = false;
}
} else {
ok = false; // don't move special files!
}
return ok && src.delete(); // only unlink if ok!
}
/**
* Removes the entire directory tree represented by the parameter, regardless whether it's a file
* or directory, whether the directory is empty or not or whether the file or directory is
* actually an archive file, an entry in an archive file or not enclosed in an archive file at
* all.
*
* <p>The name of this method is inspired by the Unix command line utility <code>rm</code> with
* the <code>-r</code> option to operate recursively.
*
* <p>This file system operation is <em>not</em> atomic.
*
* @return Whether or not the entire directory tree was successfully removed.
*/
public static boolean rm_r(final java.io.File file) {
boolean ok = true;
if (file.isDirectory()) {
// Note that listing the directory this way will cause a recursive
// deletion if the directory is actually an archive file.
// Although this does not provide best performance (the archive
// file could simply be removed like an ordinary file), it ensures
// that the state cached by the ArchiveController is not bypassed
// and hence prevents a potential bug.
java.io.File[] members = file.listFiles();
for (int i = members.length; --i >= 0; ) ok &= rm_r(members[i]);
}
return ok && file.delete();
}
/** Unchecked parameters version. */
private static void cp0(final boolean preserve, final java.io.File src, final java.io.File dst)
throws IOException {
assert src != null;
assert dst != null;
try {
try {
if (src instanceof File) {
final File srcFile = (File) src;
srcFile.ensureNotVirtualRoot("cannot read");
final String srcEntryName = srcFile.getEnclEntryName();
if (srcEntryName != null) {
cp0(preserve, srcFile.getEnclArchive().getArchiveController(), srcEntryName, dst);
return;
}
}
} catch (RfsEntryFalsePositiveException srcIsNotArchive) {
}
// Treat the source like a regular file.
final InputStream in = new java.io.FileInputStream(src);
try {
cp0(preserve, src, in, dst);
} finally {
try {
in.close();
} catch (IOException ex) {
throw new InputIOException(ex);
}
}
} catch (FileNotFoundException ex) {
throw ex;
} catch (ArchiveBusyException ex) {
throw new FileBusyException(ex);
} catch (ArchiveFileSystemException afse) {
final FileNotFoundException fnfe = new FileNotFoundException(afse.toString());
fnfe.initCause(afse);
throw fnfe;
} catch (IOException ex) {
dst.delete();
throw ex;
}
}
/**
* Returns <code>true</code> if the given file exists or can be created and at least one byte can
* be successfully written to it - the file is restored to its previous state afterwards. This is
* a much stronger test than {@link File#canWrite()}.
*
* <p>Please note that if the file is actually open for reading or other activities this method
* may not be able to reset the last modification time of the file after testing, in which case
* <code>false</code> is returned. This is known to apply to the Windows platform, but not on Unix
* platforms.
*/
public static boolean isWritableOrCreatable(final java.io.File file) {
try {
if (!file.exists()) {
final boolean created = file.createNewFile();
boolean ok = isWritableOrCreatable(file);
if (created && !file.delete()) ok = false; // be conservative!
return ok;
} else if (file.canWrite()) {
// Some operating and file system combinations make File.canWrite()
// believe that the file is writable although it's not.
// We are not that gullible, so let's test this...
final long time = file.lastModified();
if (!file.setLastModified(time + 1)) {
// This may happen on Windows and normally means that
// somebody else has opened this file
// (regardless of read or write mode).
// Be conservative: We don't allow writing to this file!
return false;
}
boolean ok;
try {
// Open the file for reading and writing, requiring any
// update to its contents to be written to the filesystem
// synchronously.
// As Dr. Simon White from Catalysoft, Cambridge, UK reported,
// "rws" does NOT work on Mac OS X with Apple's Java 1.5
// Release 1 (equivalent to Sun's Java 1.5.0_02), however
// it DOES work with Apple's Java 1.5 Release 3.
// He also confirmed that "rwd" works on Apple's
// Java 1.5 Release 1, so we use this instead.
// Thank you very much for spending the time to fix this
// issue, Dr. White!
final RandomAccessFile raf = new RandomAccessFile(file, "rwd");
try {
final boolean empty;
int octet = raf.read();
if (octet == -1) {
octet = 0; // assume first byte is 0
empty = true;
} else {
empty = false;
}
// Let's test if we can (over)write the first byte.
raf.seek(0);
raf.write((octet ^ -1) & 0xFF); // write complement
try {
// Rewrite original content and check success.
raf.seek(0);
raf.write(octet);
raf.seek(0);
final int check = raf.read();
// This should always return true unless the storage
// device is faulty.
ok = octet == check;
} finally {
if (empty) raf.setLength(0);
}
} finally {
raf.close();
}
} finally {
if (!file.setLastModified(time)) {
// This may happen on Windows and normally means that
// somebody else has opened this file meanwhile
// (regardless of read or write mode).
// Be conservative: We don't allow (further) writing to
// this file!
ok = false;
}
}
return ok;
} else { // if (file.exists() && !file.canWrite()) {
return false;
}
} catch (IOException ex) {
return false; // don't allow writing if anything goes wrong!
}
}