01: /*
02: * Licensed to the Apache Software Foundation (ASF) under one or more
03: * contributor license agreements. See the NOTICE file distributed with
04: * this work for additional information regarding copyright ownership.
05: * The ASF licenses this file to You under the Apache License, Version 2.0
06: * (the "License"); you may not use this file except in compliance with
07: * the License. You may obtain a copy of the License at
08: *
09: * http://www.apache.org/licenses/LICENSE-2.0
10: *
11: * Unless required by applicable law or agreed to in writing, software
12: * distributed under the License is distributed on an "AS IS" BASIS,
13: * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14: * See the License for the specific language governing permissions and
15: * limitations under the License.
16: */
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 extends AbstractLayeredFileProvider
38: implements FileProvider {
39: protected final static Collection capabilities = Collections
40: .unmodifiableCollection(Arrays.asList(new Capability[] {
41: Capability.GET_LAST_MODIFIED, Capability.GET_TYPE,
42: Capability.LIST_CHILDREN, Capability.READ_CONTENT,
43: Capability.URI, Capability.VIRTUAL }));
44:
45: public TarFileProvider() {
46: super ();
47: }
48:
49: /**
50: * Creates a layered file system. This method is called if the file system
51: * is not cached.
52: *
53: * @param scheme The URI scheme.
54: * @param file The file to create the file system on top of.
55: * @return The file system.
56: */
57: protected FileSystem doCreateFileSystem(final String scheme,
58: final FileObject file,
59: final FileSystemOptions fileSystemOptions)
60: throws FileSystemException {
61: final FileName rootName = new LayeredFileName(scheme, file
62: .getName(), FileName.ROOT_PATH, FileType.FOLDER);
63: return new TarFileSystem(rootName, file, fileSystemOptions);
64: }
65:
66: public Collection getCapabilities() {
67: return capabilities;
68: }
69: }
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