Always use 'this.' when accessing fields

Ensure that `this.` is used consistently when accessing class
fields.

Issue: SPR-16968

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

@@ -76,7 +76,7 @@ public class DeclareParentsAdvisor implements IntroductionAdvisor {
 
 		// Excludes methods implemented.
 		ClassFilter typePatternFilter = new TypePatternClassFilter(typePattern);
-		ClassFilter exclusion = (clazz -> !introducedInterface.isAssignableFrom(clazz));
+		ClassFilter exclusion = (clazz -> !this.introducedInterface.isAssignableFrom(clazz));
 		this.typePatternClassFilter = ClassFilters.intersection(typePatternFilter, exclusion);
 	}
 

spring-aop/src/main/java/org/springframework/aop/framework/ProxyFactoryBean.java

@@ -651,7 +651,7 @@ public class ProxyFactoryBean extends ProxyCreatorSupport
 		}
 
 		public String getBeanName() {
-			return beanName;
+			return this.beanName;
 		}
 
 		@Override

spring-aop/src/main/java/org/springframework/aop/support/RegexpMethodPointcutAdvisor.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2017 the original author or authors.
+ * Copyright 2002-2018 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.
@@ -128,7 +128,7 @@ public class RegexpMethodPointcutAdvisor extends AbstractGenericPointcutAdvisor
 					this.pointcut.setPatterns(this.patterns);
 				}
 			}
-			return pointcut;
+			return this.pointcut;
 		}
 	}
 

spring-aop/src/main/java/org/springframework/aop/support/RootClassFilter.java

@@ -38,7 +38,7 @@ public class RootClassFilter implements ClassFilter, Serializable {
 
 	@Override
 	public boolean matches(Class<?> candidate) {
-		return clazz.isAssignableFrom(candidate);
+		return this.clazz.isAssignableFrom(candidate);
 	}
 
 }