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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.temp;
18  
19  import org.apache.commons.vfs.FileName;
20  import org.apache.commons.vfs.FileObject;
21  import org.apache.commons.vfs.FileSystem;
22  import org.apache.commons.vfs.FileSystemException;
23  import org.apache.commons.vfs.FileSystemOptions;
24  import org.apache.commons.vfs.FileType;
25  import org.apache.commons.vfs.provider.AbstractFileProvider;
26  import org.apache.commons.vfs.provider.FileProvider;
27  import org.apache.commons.vfs.provider.UriParser;
28  import org.apache.commons.vfs.provider.local.DefaultLocalFileProvider;
29  import org.apache.commons.vfs.provider.local.LocalFileSystem;
30  
31  import java.io.File;
32  import java.util.Collection;
33  
34  /***
35   * A provider for temporary files.
36   *
37   * @author <a href="mailto:adammurdoch@apache.org">Adam Murdoch</a>
38   * @version $Revision: 480428 $ $Date: 2006-11-29 07:15:24 +0100 (Mi, 29 Nov 2006) $
39   */
40  public class TemporaryFileProvider
41      extends AbstractFileProvider
42      implements FileProvider, Comparable
43  {
44      private File rootFile;
45  
46      /*
47      private final static FileName tmpFileName = new AbstractFileName("tmp", "/")
48      {
49          protected FileName createName(String absPath)
50          {
51              return null;
52          }
53  
54          protected void appendRootUri(StringBuffer buffer)
55          {
56          }
57      };
58  */
59  
60      public TemporaryFileProvider(final File rootFile)
61      {
62          this();
63  
64          this.rootFile = rootFile;
65      }
66  
67      public TemporaryFileProvider()
68      {
69          super();
70      }
71  
72      public int compareTo(Object o)
73      {
74          int h1 = hashCode();
75          int h2 = o.hashCode();
76          if (h1 < h2)
77          {
78              return -1;
79          }
80          if (h1 > h2)
81          {
82              return 1;
83          }
84  
85          return 0;
86      }
87  
88      /***
89       * Locates a file object, by absolute URI.
90       */
91      public synchronized FileObject findFile(final FileObject baseFile, final String uri, final FileSystemOptions properties)
92          throws FileSystemException
93      {
94          // Parse the name
95          final StringBuffer buffer = new StringBuffer(uri);
96          final String scheme = UriParser.extractScheme(uri, buffer);
97  
98          UriParser.fixSeparators(buffer);
99          
100         FileType fileType = UriParser.normalisePath(buffer);
101         final String path = buffer.toString();
102 
103         // Create the temp file system if it does not exist
104         // FileSystem filesystem = findFileSystem( this, (Properties) null);
105         FileSystem filesystem = findFileSystem(this, properties);
106         if (filesystem == null)
107         {
108             if (rootFile == null)
109             {
110                 rootFile = getContext().getTemporaryFileStore().allocateFile("tempfs");
111             }
112             final FileName rootName =
113                 getContext().parseURI(scheme + ":" + FileName.ROOT_PATH);
114             // final FileName rootName =
115             //    new LocalFileName(scheme, scheme + ":", FileName.ROOT_PATH);
116             filesystem = new LocalFileSystem(rootName, rootFile.getAbsolutePath(), properties);
117             addFileSystem(this, filesystem);
118         }
119 
120         // Find the file
121         return filesystem.resolveFile(path);
122     }
123 
124     public Collection getCapabilities()
125     {
126         return DefaultLocalFileProvider.capabilities;
127     }
128 }