5 public class SvcConfig {
6 public static class Param<T> {
8 private final Object id = new Object();
14 @SuppressWarnings("unchecked")
16 if(Thread.currentThread() instanceof RequestThread) {
17 Map<Object, Object> props = RequestThread.request().props();
18 if(props.containsKey(id)) {
19 /* This can very well actually be set to something
20 * of the wrong type, but since the result would,
21 * obviously, be a ClassCastException either way,
22 * this way is at least the more convenient. */
23 return((T)props.get(id));
30 public static Responder let(final Responder next, Object... params) {
31 final Map<Param, Object> values = new HashMap<Param, Object>();
32 if((params.length % 2) != 0)
33 throw(new IllegalArgumentException("SvcConfig.let takes only an even number of parameters"));
34 for(int i = 0; i < params.length; i += 2)
35 values.put((Param)params[i], params[i + 1]);
36 return(new Responder() {
37 public void respond(Request req) {
38 final Map<Param, Object> old = new HashMap<Param, Object>();
40 Map<Object, Object> props = req.props();
41 for(Map.Entry<Param, Object> val : values.entrySet()) {
42 Param p = val.getKey();
43 if(props.containsKey(p.id))
44 old.put(p, props.get(p.id));
45 props.put(p.id, val.getValue());
51 Map<Object, Object> props = req.props();
52 for(Map.Entry<Param, Object> val : values.entrySet()) {
53 Param p = val.getKey();
54 if(old.containsKey(p)) {
55 props.put(p.id, old.get(p));