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 public CompositeFileProvider() {
33 }
34
35 /**
36 * The schemes known.
37 *
38 * @return Array of supported schemes.
39 */
40 protected abstract String[] getSchemes();
41
42 /**
43 * Locates a file object, by absolute URI.
44 *
45 * @param baseFile The base FileObject.
46 * @param uri The file to find.
47 * @param fileSystemOptions The options for the FileSystem.
48 * @return A FileObject for the located file.
49 * @throws FileSystemException if an error occurs.
50 */
51 @Override
52 public FileObjectect.html#FileObject">FileObject findFile(final FileObject baseFile, final String uri, final FileSystemOptions fileSystemOptions)
53 throws FileSystemException {
54 final StringBuilder buf = new StringBuilder(INITIAL_BUFSZ);
55
56 UriParser.extractScheme(getContext().getFileSystemManager().getSchemes(), uri, buf);
57 Stream.of(getSchemes()).forEach(scheme -> buf.insert(0, scheme + ":"));
58
59 return getContext().getFileSystemManager().resolveFile(buf.toString(), fileSystemOptions);
60 }
61 }