Merge pull request #15575 from igor-suhorukov

* pr/15575:
  Polish "Use Optional value in more functional style"
  Use Optional value in more functional style

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/web/servlet/CompositeHandlerAdapter.java

 /*
- * Copyright 2012-2017 the original author or authors.
+ * Copyright 2012-2018 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.
@@ -63,10 +63,9 @@ class CompositeHandlerAdapter implements HandlerAdapter {
 	@Override
 	public long getLastModified(HttpServletRequest request, Object handler) {
 		Optional<HandlerAdapter> adapter = getAdapter(handler);
-		if (adapter.isPresent()) {
-			return adapter.get().getLastModified(request, handler);
-		}
-		return 0;
+		return adapter
+				.map((handlerAdapter) -> handlerAdapter.getLastModified(request, handler))
+				.orElse(0L);
 	}
 
 	private Optional<HandlerAdapter> getAdapter(Object handler) {