FileFinder


1   package net.sf.uitags.js;
2   
3   import java.io.BufferedReader  ;
4   import java.io.IOException  ;
5   import java.io.InputStream  ;
6   import java.io.InputStreamReader  ;
7   
8   import javax.servlet.ServletContext  ;
9   
10  import net.sf.uitags.util.ResourceCloser;
11  
12  /**
13   * A class that knows how to find (and access the contents of) a file.
14   *
15   * @author jonni
16   */
17  abstract class FileFinder {
18    static FileFinder getInstance(
19        ServletContext   context, String   containingDirName) {
20      if (containingDirName == null) {
21        return new ClasspathBasedFileFinder();
22      }
23  
24      return new FileSystemBasedFileFinder(context, containingDirName);
25    }
26  
27    final String   readContents(String   fileName) throws IOException   {
28      StringBuffer   out = new StringBuffer  ();
29  
30      InputStream   in = null;
31      BufferedReader   contents = null;
32      try {
33        in = openInputStream(fileName);
34        contents = new BufferedReader  (new InputStreamReader  (in));
35        while (contents.ready()) {
36          out.append(contents.readLine());
37          out.append("\n");
38        }
39      }
40      finally {
41        ResourceCloser.close(contents);
42        ResourceCloser.close(in);
43      }
44  
45      return out.toString();
46    }
47  
48    /**
49     * To be implemented by the child class, this method opens an input stream.
50     * As soon as this method returns the child class should give up control of
51     * the input stream. It should not, for example, attempt to close the
52     * input stream.
53     */
54    protected abstract InputStream   openInputStream(String   fileName)
55        throws IOException  ;
56  
57    /**
58     * Returns a <code>boolean</code> to indicate whether the finder is able
59     * to find a file that is not part of uitags suites.
60     */
61    protected abstract boolean supportsFilesNotFromSuites();
62  
63    /**
64     * Returns the specified file's last modified time or 0 if unknown.
65     */
66    protected abstract long getLastModified(String   fileName)
67        throws IOException  ;
68  }
69
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