Add route(RequestPredicate, HandlerFunction) to RouterFunctions builder

Closes gh-22701

spring-webflux/src/main/java/org/springframework/web/reactive/function/server/RouterFunctionBuilder.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2019 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -140,6 +140,12 @@ class RouterFunctionBuilder implements RouterFunctions.Builder {
 		return add(RequestPredicates.OPTIONS(pattern).and(predicate), handlerFunction);
 	}
 
+	@Override
+	public RouterFunctions.Builder route(RequestPredicate predicate,
+			HandlerFunction<ServerResponse> handlerFunction) {
+		return add(RouterFunctions.route(predicate, handlerFunction));
+	}
+
 	@Override
 	public RouterFunctions.Builder resources(String pattern, Resource location) {
 		return add(RouterFunctions.resources(pattern, location));

spring-webflux/src/main/java/org/springframework/web/reactive/function/server/RouterFunctions.java

@@ -477,6 +477,18 @@ public abstract class RouterFunctions {
 		 */
 		Builder OPTIONS(String pattern, RequestPredicate predicate, HandlerFunction<ServerResponse> handlerFunction);
 
+		/**
+		 * Adds a route to the given handler function that handles all requests that match the
+		 * given predicate.
+		 *
+		 * @param predicate the request predicate to match
+		 * @param handlerFunction the handler function to handle all requests that match the predicate
+		 * @return this builder
+		 * @since 5.2
+		 * @see RequestPredicates
+		 */
+		Builder route(RequestPredicate predicate, HandlerFunction<ServerResponse> handlerFunction);
+
 		/**
 		 * Adds the given route to this builder. Can be used to merge externally defined router
 		 * functions into this builder, or can be combined with