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.impl;
18:
19: import org.apache.commons.vfs.FileContent;
20: import org.apache.commons.vfs.FileObject;
21: import org.apache.commons.vfs.FileSystemException;
22:
23: import java.util.HashMap;
24: import java.util.Map;
25:
26: /**
27: * A helper class that determines the provider to use for a file.
28: *
29: * @author <a href="mailto:adammurdoch@apache.org">Adam Murdoch</a>
30: * @version $Revision: 480428 $ $Date: 2006-11-28 22:15:24 -0800 (Tue, 28 Nov 2006) $
31: */
32: class FileTypeMap {
33: private final Map mimeTypeMap = new HashMap();
34: private final Map extensionMap = new HashMap();
35:
36: /**
37: * Adds a MIME type mapping.
38: */
39: public void addMimeType(final String mimeType, final String scheme) {
40: mimeTypeMap.put(mimeType, scheme);
41: }
42:
43: /**
44: * Adds a filename extension mapping.
45: */
46: public void addExtension(final String extension, final String scheme) {
47: extensionMap.put(extension, scheme);
48: }
49:
50: /**
51: * Finds the provider to use to create a filesystem from a given file.
52: */
53: public String getScheme(final FileObject file)
54: throws FileSystemException {
55: // Check the file's mime type for a match
56: final FileContent content = file.getContent();
57: // final String mimeType = (String) content.getAttribute("content-type");
58: final String mimeType = content.getContentInfo()
59: .getContentType();
60: if (mimeType != null) {
61: return (String) mimeTypeMap.get(mimeType);
62: }
63:
64: // Check the file's extension for a match
65: final String extension = file.getName().getExtension();
66: return (String) extensionMap.get(extension);
67: }
68: }
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