From 32248dc9daf5461a06e4ab134a996a32ab056c7a Mon Sep 17 00:00:00 2001
From: Francesco Nigro <nigro.fra@gmail.com>
Date: Mon, 11 Dec 2023 18:20:53 +0100
Subject: [PATCH] Optimise single value map lookups

---
 .../reactive/server/handlers/ClassRoutingHandler.java      | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/independent-projects/resteasy-reactive/server/runtime/src/main/java/org/jboss/resteasy/reactive/server/handlers/ClassRoutingHandler.java b/independent-projects/resteasy-reactive/server/runtime/src/main/java/org/jboss/resteasy/reactive/server/handlers/ClassRoutingHandler.java
index b46936a7778fd..ec56ad5d7f84c 100644
--- a/independent-projects/resteasy-reactive/server/runtime/src/main/java/org/jboss/resteasy/reactive/server/handlers/ClassRoutingHandler.java
+++ b/independent-projects/resteasy-reactive/server/runtime/src/main/java/org/jboss/resteasy/reactive/server/handlers/ClassRoutingHandler.java
@@ -34,7 +34,12 @@ public class ClassRoutingHandler implements ServerRestHandler {
     final boolean resumeOn404;
 
     public ClassRoutingHandler(Map<String, RequestMapper<RuntimeResource>> mappers, int parameterOffset, boolean resumeOn404) {
-        this.mappers = mappers;
+        if (mappers.size() == 1) {
+            var singleEntry = mappers.entrySet().iterator().next();
+            this.mappers =  Map.of(singleEntry.getKey(), singleEntry.getValue());
+        } else {
+            this.mappers = mappers;
+        }
         this.parameterOffset = parameterOffset;
         this.resumeOn404 = resumeOn404;
     }