1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * 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.vfs2.impl;
18
19 import java.io.IOException;
20 import java.net.URL;
21 import java.util.jar.Attributes;
22
23 import org.apache.commons.vfs2.FileObject;
24 import org.apache.commons.vfs2.FileSystemException;
25 import org.apache.commons.vfs2.util.FileObjectUtils;
26
27 /**
28 * Helper class for VFSClassLoader. This represents a resource loaded with the classloader.
29 *
30 * @see VFSClassLoader
31 */
32 final class Resource {
33
34 private final FileObject root;
35 private final FileObject resource;
36 private final FileObject packageFolder;
37 private final String packageName;
38
39 /**
40 * Creates a new instance.
41 *
42 * @param root The code source FileObject.
43 * @param resource The resource of the FileObject.
44 */
45 public Resource(final String name, final FileObjectObject.html#FileObject">FileObject root, final FileObject resource) throws FileSystemException {
46 this.root = root;
47 this.resource = resource;
48 packageFolder = resource.getParent();
49 final int pos = name.lastIndexOf('/');
50 if (pos == -1) {
51 packageName = null;
52 } else {
53 packageName = name.substring(0, pos).replace('/', '.');
54 }
55 }
56
57 /**
58 * Returns the URL of the resource.
59 */
60 public URL getURL() throws FileSystemException {
61 return resource.getURL();
62 }
63
64 /**
65 * Returns the name of the package containing the resource.
66 */
67 public String getPackageName() {
68 return packageName;
69 }
70
71 /**
72 * Returns an attribute of the package containing the resource.
73 */
74 public String getPackageAttribute(final Attributes.Name attrName) throws FileSystemException {
75 return (String) packageFolder.getContent().getAttribute(attrName.toString());
76 }
77
78 /**
79 * Returns the folder for the package containing the resource.
80 */
81 public FileObject getPackageFolder() {
82 return packageFolder;
83 }
84
85 /**
86 * Returns the FileObject of the resource.
87 */
88 public FileObject getFileObject() {
89 return resource;
90 }
91
92 /**
93 * Returns the code source as an URL.
94 */
95 public URL getCodeSourceURL() throws FileSystemException {
96 return root.getURL();
97 }
98
99 /**
100 * Returns the data for this resource as a byte array.
101 */
102 public byte[] getBytes() throws IOException {
103 return FileObjectUtils.getContentAsByteArray(resource);
104 }
105 }