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17 package org.apache.commons.vfs.provider.tar;
18
19 import org.apache.commons.vfs.Capability;
20 import org.apache.commons.vfs.FileName;
21 import org.apache.commons.vfs.FileObject;
22 import org.apache.commons.vfs.FileSystem;
23 import org.apache.commons.vfs.FileSystemException;
24 import org.apache.commons.vfs.FileSystemOptions;
25 import org.apache.commons.vfs.FileType;
26 import org.apache.commons.vfs.provider.AbstractLayeredFileProvider;
27 import org.apache.commons.vfs.provider.FileProvider;
28 import org.apache.commons.vfs.provider.LayeredFileName;
29
30 import java.util.Arrays;
31 import java.util.Collection;
32 import java.util.Collections;
33
34 /***
35 * A file system provider for Tar files. Provides read-only file systems.
36 */
37 public class TarFileProvider
38 extends AbstractLayeredFileProvider
39 implements FileProvider
40 {
41 protected final static Collection capabilities = Collections.unmodifiableCollection(Arrays.asList(new Capability[]
42 {
43 Capability.GET_LAST_MODIFIED,
44 Capability.GET_TYPE,
45 Capability.LIST_CHILDREN,
46 Capability.READ_CONTENT,
47 Capability.URI,
48 Capability.VIRTUAL
49 }));
50
51 public TarFileProvider()
52 {
53 super();
54 }
55
56 /***
57 * Creates a layered file system. This method is called if the file system
58 * is not cached.
59 *
60 * @param scheme The URI scheme.
61 * @param file The file to create the file system on top of.
62 * @return The file system.
63 */
64 protected FileSystem doCreateFileSystem(final String scheme,
65 final FileObject file,
66 final FileSystemOptions fileSystemOptions)
67 throws FileSystemException
68 {
69 final FileName rootName =
70 new LayeredFileName(scheme, file.getName(), FileName.ROOT_PATH, FileType.FOLDER);
71 return new TarFileSystem(rootName, file, fileSystemOptions);
72 }
73
74 public Collection getCapabilities()
75 {
76 return capabilities;
77 }
78 }