FileType


1   /*
2    * Copyright (c) 2005, Rob Gordon.
3    */
4   package org.oddjob.io;
5   
6   import java.io.File  ;
7   import java.io.FileInputStream  ;
8   import java.io.FileNotFoundException  ;
9   import java.io.InputStream  ;
10  
11  import org.oddjob.OddjobException;
12  
13  /**
14   * @oddjob.description Specify a file.
15   * 
16   * @oddjob.example
17   * <pre>
18   * &lt;file file="foo.txt"/&gt;
19   * </pre>
20   * @author Rob Gordon.
21   */
22  public class FileType {
23  
24      /**
25       * @oddjob.property
26       * @oddjob.description The file.
27       * @oddjob.required Yes.
28       */
29      private File   file;
30          
31      /**
32       * Set the file.
33       * 
34       * @param file The file.
35       */
36      public void setFile(File   file) {
37          this.file = file;
38      }
39      
40      /**
41       * Get the value.
42       * 
43       * @return The value.
44       */
45      public Object   valueFor(Class   required) 
46      throws ClassCastException   {
47          if (required == null) {
48              required = File  .class;
49          }
50          if (required.isAssignableFrom(File  .class)) {
51              return file;
52          }
53          if (required.isAssignableFrom(InputStream  .class)) {
54              try {
55                  return new FileInputStream  (file);
56              } catch (FileNotFoundException   e) {
57                  throw new OddjobException("Failed to open file for input.");
58              }
59          }
60          if (required.isAssignableFrom(InputStream  .class)) {
61              try {
62                  return new FileInputStream  (file);
63              } catch (FileNotFoundException   e) {
64                  throw new OddjobException("Failed to open file for output.");
65              }
66          }
67          if (required.isAssignableFrom(String  .class)) {
68              return file.toString();
69          }
70          
71          throw new ClassCastException  ("Can not convert a File to " + required);
72      }
73      
74      public String   toString() {
75          return (String  ) valueFor(String  .class);
76      }
77  }
78
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