Added missing javadoc

cas-client-core/src/main/java/org/jasig/cas/client/authentication/AuthenticationRedirectStrategy.java

@@ -5,10 +5,23 @@ import javax.servlet.http.HttpServletResponse;
 import java.io.IOException;
 
 /**
- * Created by battags on 6/18/13.
+ * Interface to abstract the authentication strategy for redirecting.  The traditional method was to always just redirect,
+ * but due to AJAX, etc. we may need to support other strategies.  This interface is designed to hold that logic such that
+ * authentication filter class does not get crazily complex.
+ *
+ * @author Scott Battaglia
+ * @since 3.3.0
  */
 public interface AuthenticationRedirectStrategy {
 
+    /**
+     * Method name is a bit of a misnomer.  This method handles "redirection" for a localized version of redirection (i.e. AJAX might mean an XML fragment that contains the url to go to).
+     *
+     * @param request the original HttpServletRequest.   MAY NOT BE NULL.
+     * @param response the original HttpServletResponse.  MAY NOT BE NULL.
+     * @param potentialRedirectUrl the url that might be used (there are no guarantees of course!)
+     * @throws IOException the exception to throw if there is some type of error.  This will bubble up through the filter.
+     */
     void redirect(HttpServletRequest request, HttpServletResponse response, String potentialRedirectUrl) throws IOException;
 
 }