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Java > Open Source Codes > org > apache > commons > vfs > provider > CompositeFileProvider


1 /*
2  * Copyright 2002-2005 The Apache Software Foundation.
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 package org.apache.commons.vfs.provider;
17
18 import org.apache.commons.vfs.FileObject;
19 import org.apache.commons.vfs.FileSystemException;
20 import org.apache.commons.vfs.FileSystemOptions;
21
22 /**
23  * Description
24  *
25  * @author <a HREF="mailto:imario@apache.org">Mario Ivankovits</a>
26  */
27 public abstract class CompositeFileProvider extends AbstractFileProvider
28 {
29     public CompositeFileProvider()
30     {
31         super();
32     }
33
34     /**
35      * The schemes to use for resolve
36      */
37     protected abstract String JavaDoc[] getSchemes();
38
39     /**
40      * Locates a file object, by absolute URI.
41      */
42     public FileObject findFile(final FileObject baseFile,
43                                final String JavaDoc uri,
44                                final FileSystemOptions fileSystemOptions)
45         throws FileSystemException
46     {
47         StringBuffer JavaDoc buf = new StringBuffer JavaDoc(80);
48
49         UriParser.extractScheme(uri, buf);
50
51         String JavaDoc[] schemes = getSchemes();
52         for (int iterSchemes = 0; iterSchemes < schemes.length; iterSchemes++)
53         {
54             buf.insert(0, ":");
55             buf.insert(0, schemes[iterSchemes]);
56         }
57
58         FileObject fo = getContext().getFileSystemManager().resolveFile(buf.toString(), fileSystemOptions);
59         return fo;
60     }
61 }
62
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