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.provider;
18
19 import java.util.stream.Stream;
20
21 import org.apache.commons.vfs2.FileObject;
22 import org.apache.commons.vfs2.FileSystemException;
23 import org.apache.commons.vfs2.FileSystemOptions;
24
25 /**
26 * Description.
27 */
28 public abstract class CompositeFileProvider extends AbstractFileProvider {
29
30 private static final int INITIAL_BUFSZ = 80;
31
32 /**
33 * Constructs a new instance.
34 */
35 public CompositeFileProvider() {
36 }
37
38 /**
39 * Locates a file object, by absolute URI.
40 *
41 * @param baseFile The base FileObject.
42 * @param uri The file to find.
43 * @param fileSystemOptions The options for the FileSystem.
44 * @return A FileObject for the located file.
45 * @throws FileSystemException if an error occurs.
46 */
47 @Override
48 public FileObject findFile(final FileObject baseFile, final String uri, final FileSystemOptions fileSystemOptions)
49 throws FileSystemException {
50 final StringBuilder buf = new StringBuilder(INITIAL_BUFSZ);
51
52 UriParser.extractScheme(getContext().getFileSystemManager().getSchemes(), uri, buf);
53 Stream.of(getSchemes()).forEach(scheme -> buf.insert(0, scheme + ":"));
54
55 return getContext().getFileSystemManager().resolveFile(buf.toString(), fileSystemOptions);
56 }
57
58 /**
59 * The schemes known.
60 *
61 * @return Array of supported schemes.
62 */
63 protected abstract String[] getSchemes();
64 }