1.1 --- a/src/main/java/de/uapcore/lightpit/AbstractLightPITServlet.java Wed May 13 21:46:26 2020 +0200
1.2 +++ b/src/main/java/de/uapcore/lightpit/AbstractLightPITServlet.java Thu May 14 22:48:01 2020 +0200
1.3 @@ -39,6 +39,7 @@
1.4 import javax.servlet.http.HttpServletResponse;
1.5 import javax.servlet.http.HttpSession;
1.6 import java.io.IOException;
1.7 +import java.lang.reflect.Constructor;
1.8 import java.lang.reflect.Method;
1.9 import java.lang.reflect.Modifier;
1.10 import java.sql.Connection;
1.11 @@ -225,6 +226,18 @@
1.12 }
1.13
1.14 /**
1.15 + * @param req the servlet request object
1.16 + * @param location the location where to redirect
1.17 + * @see Constants#REQ_ATTR_REDIRECT_LOCATION
1.18 + */
1.19 + public void setRedirectLocation(HttpServletRequest req, String location) {
1.20 + if (location.startsWith("./")) {
1.21 + location = location.replaceFirst("\\./", Functions.baseHref(req));
1.22 + }
1.23 + req.setAttribute(Constants.REQ_ATTR_REDIRECT_LOCATION, location);
1.24 + }
1.25 +
1.26 + /**
1.27 * Specifies the name of an additional stylesheet used by the module.
1.28 * <p>
1.29 * Setting an additional stylesheet is optional, but quite common for HTML
1.30 @@ -240,6 +253,30 @@
1.31 req.setAttribute(Constants.REQ_ATTR_STYLESHEET, Functions.enforceExt(stylesheet, ".css"));
1.32 }
1.33
1.34 + /**
1.35 + * Obtains a request parameter of the specified type.
1.36 + * The specified type must have a single-argument constructor accepting a string to perform conversion.
1.37 + * The constructor of the specified type may throw an exception on conversion failures.
1.38 + *
1.39 + * @param req the servlet request object
1.40 + * @param clazz the class object of the expected type
1.41 + * @param name the name of the parameter
1.42 + * @param <T> the expected type
1.43 + * @return the parameter value or an empty optional, if no parameter with the specified name was found
1.44 + */
1.45 + public<T> Optional<T> getParameter(HttpServletRequest req, Class<T> clazz, String name) {
1.46 + final String paramValue = req.getParameter(name);
1.47 + if (paramValue == null) return Optional.empty();
1.48 + if (clazz.equals(String.class)) return Optional.of((T)paramValue);
1.49 + try {
1.50 + final Constructor<T> ctor = clazz.getConstructor(String.class);
1.51 + return Optional.of(ctor.newInstance(paramValue));
1.52 + } catch (ReflectiveOperationException e) {
1.53 + throw new RuntimeException(e);
1.54 + }
1.55 +
1.56 + }
1.57 +
1.58 private void forwardToFullView(HttpServletRequest req, HttpServletResponse resp)
1.59 throws IOException, ServletException {
1.60
1.61 @@ -287,6 +324,7 @@
1.62 }
1.63
1.64 // set some internal request attributes
1.65 + req.setAttribute(Constants.REQ_ATTR_BASE_HREF, Functions.baseHref(req));
1.66 req.setAttribute(Constants.REQ_ATTR_PATH, Functions.fullPath(req));
1.67 Optional.ofNullable(moduleInfo).ifPresent((proxy) -> req.setAttribute(Constants.REQ_ATTR_MODULE_INFO, proxy));
1.68
