/**
* Copies a source file to a destination file, optionally preserving the source's last
* modification time. We already have an input stream to read the source file and the destination
* appears to be an entry in an archive file. Note that this method <em>never</em> closes the
* given input stream!
*
* <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 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.
*/
static final void cp0(
final boolean preserve,
final java.io.File src,
final InputStream in,
final ArchiveController dstController,
final String dstEntryName)
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 !dstController.readLock().isLocked();
// assert !dstController.writeLock().isLocked();
try {
class OStreamCreator implements IORunnable {
OutputStream out; // = null;
public void run() throws IOException {
// Update controller.
// This may invalidate the file system object, so it must be
// done first in case srcController and dstController are the
// same!
dstController.autoUmount(dstEntryName);
final boolean lenient = File.isLenient();
// Get source archive entry.
final ArchiveEntry srcEntry = new RfsEntry(src);
// Get destination archive entry.
final ArchiveFileSystem dstFileSystem = dstController.autoMount(lenient);
final Delta delta = dstFileSystem.link(dstEntryName, lenient, preserve ? srcEntry : null);
final ArchiveEntry dstEntry = delta.getEntry();
// Create output stream.
out = dstController.createOutputStream(dstEntry, srcEntry);
// Now link the destination entry into the file system.
delta.commit();
}
}
// Create the output stream while the destination controller is
// write locked.
final OStreamCreator stream = new OStreamCreator();
dstController.runWriteLocked(stream);
final OutputStream out = stream.out;
// Finally copy the entry data.
try {
Streams.cat(in, out);
} finally {
out.close();
}
} catch (ArchiveEntryFalsePositiveException ex) {
assert dstController == ex.getController();
// Reroute call to the destination's enclosing ArchiveController.
cp0(
preserve,
src,
in,
dstController.getEnclController(),
dstController.enclEntryName(dstEntryName));
}
}
/**
* Copies a source file to a destination file, optionally preserving the source's last
* modification time. We know that the source and destination files both appear to be entries in
* an archive file.
*
* @throws FalsePositiveException If the source or the destination is a false positive and the
* exception for the destination 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 ArchiveController dstController,
final String dstEntryName)
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();
// assert !dstController.readLock().isLocked();
// assert !dstController.writeLock().isLocked();
try {
class IOStreamCreator implements IORunnable {
InputStream in;
OutputStream out;
public void run() throws IOException {
// Update controllers.
// This may invalidate the file system object, so it must be
// done first in case srcController and dstController are the
// same!
class SrcControllerUpdater implements IORunnable {
public void run() throws IOException {
srcController.autoUmount(srcEntryName);
srcController.readLock().lock(); // downgrade to read lock upon return
}
} // class SrcControllerUpdater
final ArchiveEntry srcEntry, dstEntry;
final Delta delta;
srcController.runWriteLocked(new SrcControllerUpdater());
try {
dstController.autoUmount(dstEntryName);
// Get source archive entry.
final ArchiveFileSystem srcFileSystem = srcController.autoMount(false);
srcEntry = srcFileSystem.get(srcEntryName);
// Get destination archive entry.
final boolean lenient = File.isLenient();
final ArchiveFileSystem dstFileSystem = dstController.autoMount(lenient);
delta = dstFileSystem.link(dstEntryName, lenient, preserve ? srcEntry : null);
dstEntry = delta.getEntry();
// Create input stream.
in = srcController.createInputStream(srcEntry, dstEntry);
} finally {
srcController.readLock().unlock();
}
try {
// Create output stream.
out = dstController.createOutputStream(dstEntry, srcEntry);
try {
// Now link the destination entry into the file system.
delta.commit();
} catch (IOException ex) {
out.close();
throw ex;
}
} catch (IOException ex) {
try {
in.close();
} catch (IOException inFailure) {
throw new InputIOException(inFailure);
}
throw ex;
}
}
} // class IOStreamCreator
final IOStreamCreator streams = new IOStreamCreator();
synchronized (copyLock) {
dstController.runWriteLocked(streams);
}
// Finally copy the entry data.
cp(streams.in, streams.out);
} catch (ArchiveEntryFalsePositiveException ex) {
// 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 (dstController != ex.getController()) throw ex; // not my job - pass on!
// Reroute call to the destination's enclosing archive controller.
cp0(
preserve,
srcController,
srcEntryName,
dstController.getEnclController(),
dstController.enclEntryName(dstEntryName));
}
}
