code: public static Filesystem fileExists(final File resource)
     {
        return new Filesystem(resource, new FileFilter()
        {
           @Override
           public boolean accept(File file)
           {
              return file.exists() && file.isFile();
           }
  
           @Override
           public String toString()
           {
              return "Filesystem.fileExists(" + resource.getAbsolutePath() + ")";
           }
        });
     }
docs: Create a {@link Condition} that returns <code>true</code> if the given {@link File} exists in the file-system of
  the host environment, and is a normal file.
  
  <p>
  The given file path may be parameterized:
  <p>
  <code>
  new File("/tmp/file.txt") <br>
  new File("c:\tmp\{param}.txt") <br>
  ...
  </code>
  <p>
  
  @param location {@link ParameterizedPattern} specifying the location of the {@link File}.
  
  @see {@link ConfigurationRuleParameterBuilder#where(String)}