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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.vfs2.provider.local;
18  
19  import java.io.File;
20  import java.io.FilePermission;
21  import java.util.Collection;
22  
23  import org.apache.commons.vfs2.Capability;
24  import org.apache.commons.vfs2.FileName;
25  import org.apache.commons.vfs2.FileObject;
26  import org.apache.commons.vfs2.FileSelector;
27  import org.apache.commons.vfs2.FileSystemException;
28  import org.apache.commons.vfs2.FileSystemOptions;
29  import org.apache.commons.vfs2.provider.AbstractFileName;
30  import org.apache.commons.vfs2.provider.AbstractFileSystem;
31  import org.apache.commons.vfs2.util.FileObjectUtils;
32  
33  /**
34   * A local file system.
35   */
36  public class LocalFileSystem extends AbstractFileSystem {
37  
38      private final String rootFile;
39  
40      /**
41       * Constructs a new instance.
42       *
43       * @param rootFileName The root file name of this file system.
44       * @param rootFile The root of this file system.
45       * @param fileSystemOptions Options to build this file system.
46       */
47      public LocalFileSystem(final FileName rootFileName, final String rootFile, final FileSystemOptions fileSystemOptions) {
48          super(rootFileName, null, fileSystemOptions);
49          this.rootFile = rootFile;
50      }
51  
52      /**
53       * Returns the capabilities of this file system.
54       */
55      @Override
56      protected void addCapabilities(final Collection<Capability> caps) {
57          caps.addAll(DefaultLocalFileProvider.capabilities);
58      }
59  
60      /**
61       * Creates a file object.
62       */
63      @Override
64      protected FileObject createFile(final AbstractFileName name) throws FileSystemException {
65          // Create the file
66          return new LocalFile(this, rootFile, name);
67      }
68  
69      /**
70       * Creates a temporary local copy of a file and its descendants.
71       */
72      @Override
73      protected File doReplicateFile(final FileObject fileObject, final FileSelector selector) throws Exception {
74          final LocalFile localFile = (LocalFile) FileObjectUtils.getAbstractFileObject(fileObject);
75          final File file = localFile.getLocalFile();
76          final SecurityManager sm = System.getSecurityManager();
77          if (sm != null) {
78              sm.checkPermission(new FilePermission(file.getAbsolutePath(), "read"));
79          }
80          return file;
81      }
82  
83  }