Javadoc.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/io/trunk@1299796 13f79535-47bb-0310-9956-ffa450edef68

Author: garydgregory

src/main/java/org/apache/commons/io/FileUtils.java

@@ -461,6 +461,16 @@ public static Collection<File> listFiles(
         return files;
     }
 
+    /**
+     * Validates the given arguments.
+     * <ul>
+     * <li>Throws {@link IllegalArgumentException} if {@code directory} is not a directory</li>
+     * <li>Throws {@link NullPointerException} if {@code fileFilter} is null</li>
+     * </ul>
+     * 
+     * @param directory The File to test
+     * @param fileFilter The IOFileFilter to test
+     */
     private static void validateListFilesParameters(File directory, IOFileFilter fileFilter) {
         if (!directory.isDirectory()) {
             throw new IllegalArgumentException("Parameter 'directory' is not a directory");