I would like to create an uncompressed file from a compressed file
inside of a tar archive.
Can VFS allow me to do this in one step? I can get the compressed.gz
file from archive.tar as a file on disk, then I can decompress the gzip
file and then delete the .gz version. If there is an example, tutorial
or book online or in print that would be great, I haven't found anything
like this yet.
Conceptually there is a tar file:
archive.tar
+- tardir/
+- content.txt.gz
I'd like to end up with an uncompressed file "content.txt".
I tried something like:
FileObject gzTarFile =
fsManager.resolveFile("tar:gz:/archive.tar!/tardir/content.txt.gz");
LocalFile newFile = (LocalFile)
fsManager.resolveFile("file:///destination/content.txt");
newFile.copyFrom(gzTarFile, new AllFileSelector());
Thanks in advance for any advice
-Ken
The test program I'm working with follows:
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package gov.noaa.eds.tryVfs;
import org.apache.commons.vfs.FileName;
import org.apache.commons.vfs.FileObject;
import org.apache.commons.vfs.FileSystemException;
import org.apache.commons.vfs.FileSystemManager;
import org.apache.commons.vfs.VFS;
/**
* Try using VFS to read the content of a compressed (gz) file inside of
* a tar file.
*/
public class App
{
static FileSystemManager fsManager = null;
public static void main( String[] args )
{
try {
fsManager = VFS.getManager();
} catch (FileSystemException ex) {
ex.printStackTrace();
}
try {
/* resolveFile OK */
System.out.println("Resolve tar file:");
FileObject tarFile = fsManager.resolveFile(
"tar:/extra/data/tryVfs/archive.tar");
FileName tarFileName = tarFile.getName();
System.out.println(" Path : " + tarFileName.getPath());
System.out.println(" URI : " + tarFileName.getURI());
/* resolveFile OK */
System.out.println("Resolve gzip file inside tar file:");
FileObject gzTarFile = fsManager.resolveFile(
"tar:file:///extra/data/tryVfs/archive.tar!/tarDir/content.txt.gz");
FileName gzTarFileName = gzTarFile.getName();
System.out.println(" Path : " + gzTarFileName.getPath());
System.out.println(" URI : " + gzTarFileName.getURI());
/* resolveFile has an error
* uncomment one of the // "file string" arguments for
resolveFile below
* each of the strings I've tried has an /* error message * /
*/
System.out.println("Resolve content of gzip file inside tar
file:");
FileObject contentFile = fsManager.resolveFile(
//
"tar:gz:/extra/data/tryVfs/archive.tar!/tarDir/content.txt.gz"
/* Unknown message with code "Unknown message with code
"vfs.provider.tar/open-tar-file.error".". */
//
"tar:gz:///extra/data/tryVfs/archive.tar!/tarDir/content.txt.gz"
/* Unknown message with code "Unknown message with code
"vfs.provider.tar/open-tar-file.error".". */
//
"tar:file:gz:/extra/data/tryVfs/archive.tar!/tarDir/content.txt.gz"
/* URI
"file:gz:///extra/data/tryVfs/archive.tar!/tarDir/content.txt.gz" is not
an absolute file name. */
//
"tar:file:gz:/extra/data/tryVfs/archive.tar!///tarDir/content.txt.gz!/content.txt"
/* URI
"file:gz:///extra/data/tryVfs/archive.tar!/tarDir/content.txt.gz" is not
an absolute file name. */
"tar:gz:///extra/data/tryVfs/archive.tar!/tarDir/content.txt"
/* Unknown message with code "Unknown message with code
"vfs.provider.tar/open-tar-file.error".". */
);
FileName contentFileName = contentFile.getName();
System.out.println(" Path : " + contentFileName.getPath());
System.out.println(" URI : " + contentFileName.getURI());
/* copy uncompressed content to a new file */
// LocalFile newFile = (LocalFile) fsManager.resolveFile(
// "file:///extra/data/tryVfs/content.txt");
// newFile.copyFrom(contentFile, new AllFileSelector());
} catch (FileSystemException ex) {
ex.printStackTrace();
}
} // main( String[] args )
}
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