/**
* Copies a source file to a destination file, optionally preserving the source's last
* modification time. We know that the source file appears to be an entry in an archive file, but
* we know nothing about the destination file yet.
*
* <p>Note that this method synchronizes on the class object in order to prevent dead locks by two
* threads copying archive entries to the other's source archive concurrently!
*
* @throws FalsePositiveException If the source or the destination is a false positive and the
* exception cannot get resolved within this method.
* @throws InputIOException If copying the data fails because of an IOException in the source.
* @throws IOException If copying the data fails because of an IOException in the destination.
*/
private static void cp0(
final boolean preserve,
final ArchiveController srcController,
final String srcEntryName,
final java.io.File dst)
throws IOException {
// Do not assume anything about the lock status of the controller:
// This method may be called from a subclass while a lock is acquired!
// assert !srcController.readLock().isLocked();
// assert !srcController.writeLock().isLocked();
try {
try {
if (dst instanceof File) {
final File dstFile = (File) dst;
dstFile.ensureNotVirtualRoot("cannot write");
final String dstEntryName = dstFile.getEnclEntryName();
if (dstEntryName != null) {
cp0(
preserve,
srcController,
srcEntryName,
dstFile.getEnclArchive().getArchiveController(),
dstEntryName);
return;
}
}
} catch (RfsEntryFalsePositiveException isNotArchive) {
// Both the source and/or the destination may be false positives,
// so we need to use the exception's additional information to
// find out which controller actually detected the false positive.
if (isNotArchive.getController() == srcController)
throw isNotArchive; // not my job - pass on!
}
final InputStream in;
final long time;
srcController.readLock().lock();
try {
in = srcController.createInputStream0(srcEntryName); // detects false positives!
time = srcController.lastModified(srcEntryName);
} finally {
srcController.readLock().unlock();
}
// Treat the destination like a regular file.
final OutputStream out;
try {
out = new java.io.FileOutputStream(dst);
} catch (IOException ex) {
try {
in.close();
} catch (IOException inFailure) {
throw new InputIOException(inFailure);
}
throw ex;
}
cp(in, out);
if (preserve && !dst.setLastModified(time))
throw new IOException(dst.getPath() + " (cannot preserve last modification time)");
} catch (ArchiveEntryFalsePositiveException ex) {
assert srcController == ex.getController();
// Reroute call to the source's enclosing archive controller.
cp0(
preserve,
srcController.getEnclController(),
srcController.enclEntryName(srcEntryName),
dst);
}
}
