VAFile


1   /**
2    *   @creation 28/02/05
3   */
4   package com.memoire.vainstall;
5   
6   import java.io.File  ;
7   import java.io.IOException  ;
8   import java.net.URI  ;
9   
10  /**
11   * Extension of java.io.File that overcomes a problem in File.canWrite
12   * on Windows XP.  Breifly, new File("C:\\Program Files").canWrite()
13   * always returns false on Win XP even if the directory is writable.
14   * This class overrides canWrite.  The new method is used
15   * only if the platform is Windows and the file is a directory.
16   * Otherwise, the parental method is used.
17   * @author Dick Repasky
18  */
19  
20  public class VAFile extends File   {
21  
22      public VAFile(File   parent, String   child) {
23          super(parent, child);
24      }
25  
26      public VAFile(String   pathname) {
27          super(pathname);
28      }
29  
30      public VAFile(String   parent, String   child) {
31          super(parent, child);
32      }
33  
34      public VAFile(URI   uri) {
35          super(uri);
36      }
37  
38      public VAFile(File   file) {
39          super(file.getAbsolutePath());
40      }
41  
42      public boolean canWrite() {
43          boolean answer = super.canWrite();
44          if (! answer && Setup.IS_WIN && isDirectory()) {
45              answer = canWriteDirectory();
46          }
47          return answer;
48      }
49  
50      public File   getParentFile() {
51          return new VAFile(super.getParentFile());
52      }
53  
54      private boolean canWriteDirectory() {
55          boolean answer = false;
56          File   f=null;
57          try {
58              f=createTempFile("idw", "tmp", this);
59              answer = true;
60          } catch (IOException   ioe) { } // do nothing
61          finally{
62              if(f!=null)f.delete();
63          }
64          return answer;
65      }
66  }
67
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