Compare Kind references before checking log levels

Assuming reference comparisons are much quicker than checking
likely-nested logger levels, perform the former first.

Also, since the reference can match only one of the instances,
use "else if" to short-circuit the search.

spring-aop/src/main/java/org/springframework/aop/aspectj/AspectJWeaverMessageHandler.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2012 the original author or authors.
+ * Copyright 2002-2013 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.
@@ -51,36 +51,32 @@ public class AspectJWeaverMessageHandler implements IMessageHandler {
 	public boolean handleMessage(IMessage message) throws AbortException {
 		Kind messageKind = message.getKind();
 
-		if (LOGGER.isDebugEnabled() || LOGGER.isTraceEnabled()) {
 		if (messageKind == IMessage.DEBUG) {
+			if (LOGGER.isDebugEnabled() || LOGGER.isTraceEnabled()) {
 				LOGGER.debug(makeMessageFor(message));
 				return true;
 			}
 		}
-
+		else if ((messageKind == IMessage.INFO) || (messageKind == IMessage.WEAVEINFO)) {
 			if (LOGGER.isInfoEnabled()) {
-			if ((messageKind == IMessage.INFO) || (messageKind == IMessage.WEAVEINFO)) {
 				LOGGER.info(makeMessageFor(message));
 				return true;
 			}
 		}
-
+		else if (messageKind == IMessage.WARNING) {
 			if (LOGGER.isWarnEnabled()) {
-			if (messageKind == IMessage.WARNING) {
 				LOGGER.warn(makeMessageFor(message));
 				return true;
 			}
 		}
-
+		else if (messageKind == IMessage.ERROR) {
 			if (LOGGER.isErrorEnabled()) {
-			if (messageKind == IMessage.ERROR) {
 				LOGGER.error(makeMessageFor(message));
 				return true;
 			}
 		}
-
+		else if (messageKind == IMessage.ABORT) {
 			if (LOGGER.isFatalEnabled()) {
-			if (messageKind == IMessage.ABORT) {
 				LOGGER.fatal(makeMessageFor(message));
 				return true;
 			}