Imported Upstream version 4.0.0~alpha1

Former-commit-id: 806294f5ded97629b74c85c09952f2a74fe182d9

external/referencesource/System.Web/Routing/ParameterSubsegment.cs

@@ -0,0 +1,37 @@
+namespace System.Web.Routing {
+
+    // Represents a parameter subsegment of a ContentPathSegment
+    internal sealed class ParameterSubsegment : PathSubsegment {
+        public ParameterSubsegment(string parameterName) {
+            if (parameterName.StartsWith("*", StringComparison.Ordinal)) {
+                ParameterName = parameterName.Substring(1);
+                IsCatchAll = true;
+            }
+            else {
+                ParameterName = parameterName;
+            }
+        }
+
+        public bool IsCatchAll {
+            get;
+            private set;
+        }
+
+        public string ParameterName {
+            get;
+            private set;
+        }
+
+#if ROUTE_DEBUGGING
+        public override string LiteralText {
+            get {
+                return "{" + (IsCatchAll ? "*" : String.Empty) + ParameterName + "}";
+            }
+        }
+
+        public override string ToString() {
+            return "{" + (IsCatchAll ? "*" : String.Empty) + ParameterName + "}";
+        }
+#endif
+    }
+}