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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.vfs.provider;
18  
19  import org.apache.commons.vfs.FileObject;
20  import org.apache.commons.vfs.FileSystemException;
21  import org.apache.commons.vfs.FileSystemOptions;
22  
23  /***
24   * Description
25   *
26   * @author <a href="mailto:imario@apache.org">Mario Ivankovits</a>
27   * @version $Revision: 480428 $ $Date: 2006-11-29 07:15:24 +0100 (Mi, 29 Nov 2006) $
28   */
29  public abstract class CompositeFileProvider extends AbstractFileProvider
30  {
31      public CompositeFileProvider()
32      {
33          super();
34      }
35  
36      /***
37       * The schemes to use for resolve
38       */
39      protected abstract String[] getSchemes();
40  
41      /***
42       * Locates a file object, by absolute URI.
43       */
44      public FileObject findFile(final FileObject baseFile,
45                                 final String uri,
46                                 final FileSystemOptions fileSystemOptions)
47          throws FileSystemException
48      {
49          StringBuffer buf = new StringBuffer(80);
50  
51          UriParser.extractScheme(uri, buf);
52  
53          String[] schemes = getSchemes();
54          for (int iterSchemes = 0; iterSchemes < schemes.length; iterSchemes++)
55          {
56              buf.insert(0, ":");
57              buf.insert(0, schemes[iterSchemes]);
58          }
59  
60          FileObject fo = getContext().getFileSystemManager().resolveFile(buf.toString(), fileSystemOptions);
61          return fo;
62      }
63  }