org.springframework.aop.support

Class AopUtils

java.lang.Object

org.springframework.aop.support.AopUtils

public abstract class AopUtils
extends Object

Utility methods for AOP support code.

Mainly for internal use within Spring's AOP support.

See AopProxyUtils for a collection of framework-specific AOP utility methods which depend on internals of Spring's AOP framework implementation.

Author:

Rod Johnson, Juergen Hoeller, Rob Harrop

See Also:

AopProxyUtils

Constructor Summary

Constructors

Constructor and Description
AopUtils()

Method Summary

Modifier and Type	Method and Description
static boolean	canApply(Advisor advisor, Class<?> targetClass) Can the given advisor apply at all on the given class? This is an important test as it can be used to optimize out a advisor for a class.
static boolean	canApply(Advisor advisor, Class<?> targetClass, boolean hasIntroductions) Can the given advisor apply at all on the given class?
static boolean	canApply(Pointcut pc, Class<?> targetClass) Can the given pointcut apply at all on the given class?
static boolean	canApply(Pointcut pc, Class<?> targetClass, boolean hasIntroductions) Can the given pointcut apply at all on the given class?
static List<Advisor>	findAdvisorsThatCanApply(List<Advisor> candidateAdvisors, Class<?> clazz) Determine the sublist of the candidateAdvisors list that is applicable to the given class.
static Method	getMostSpecificMethod(Method method, Class<?> targetClass) Given a method, which may come from an interface, and a target class used in the current AOP invocation, find the corresponding target method if there is one.
static Class<?>	getTargetClass(Object candidate) Determine the target class of the given bean instance which might be an AOP proxy.
static Object	invokeJoinpointUsingReflection(Object target, Method method, Object[] args) Invoke the given target via reflection, as part of an AOP method invocation.
static boolean	isAopProxy(Object object) Check whether the given object is a JDK dynamic proxy or a CGLIB proxy.
static boolean	isCglibProxy(Object object) Check whether the given object is a CGLIB proxy.
static boolean	isEqualsMethod(Method method) Determine whether the given method is an "equals" method.
static boolean	isFinalizeMethod(Method method) Determine whether the given method is a "finalize" method.
static boolean	isHashCodeMethod(Method method) Determine whether the given method is a "hashCode" method.
static boolean	isJdkDynamicProxy(Object object) Check whether the given object is a JDK dynamic proxy.
static boolean	isToStringMethod(Method method) Determine whether the given method is a "toString" method.
static Method	selectInvocableMethod(Method method, Class<?> targetType) Select an invocable method on the target type: either the given method itself if actually exposed on the target type, or otherwise a corresponding method on one of the target type's interfaces or on the target type itself.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

AopUtils

public AopUtils()

Method Detail

isAopProxy

public static boolean isAopProxy(Object object)

Check whether the given object is a JDK dynamic proxy or a CGLIB proxy.

This method additionally checks if the given object is an instance of SpringProxy.

Parameters:

object - the object to check

See Also:

isJdkDynamicProxy(java.lang.Object), isCglibProxy(java.lang.Object)

isJdkDynamicProxy

public static boolean isJdkDynamicProxy(Object object)

Check whether the given object is a JDK dynamic proxy.

This method goes beyond the implementation of Proxy.isProxyClass(Class) by additionally checking if the given object is an instance of SpringProxy.

Parameters:

object - the object to check

See Also:

Proxy.isProxyClass(java.lang.Class<?>)

isCglibProxy

public static boolean isCglibProxy(Object object)

Check whether the given object is a CGLIB proxy.

This method goes beyond the implementation of ClassUtils.isCglibProxy(Object) by additionally checking if the given object is an instance of SpringProxy.

Parameters:

object - the object to check

See Also:

ClassUtils.isCglibProxy(Object)

getTargetClass

public static Class<?> getTargetClass(Object candidate)

Determine the target class of the given bean instance which might be an AOP proxy.

Returns the target class for an AOP proxy or the plain class otherwise.

Parameters:

candidate - the instance to check (might be an AOP proxy)

Returns:

the target class (or the plain class of the given object as fallback; never null)

See Also:

TargetClassAware.getTargetClass(), AopProxyUtils.ultimateTargetClass(Object)

selectInvocableMethod

public static Method selectInvocableMethod(Method method,
                                           Class<?> targetType)

Select an invocable method on the target type: either the given method itself if actually exposed on the target type, or otherwise a corresponding method on one of the target type's interfaces or on the target type itself.

Parameters:

method - the method to check

targetType - the target type to search methods on (typically an AOP proxy)

Returns:

a corresponding invocable method on the target type

Throws:

IllegalStateException - if the given method is not invocable on the given target type (typically due to a proxy mismatch)

Since:

4.3

See Also:

MethodIntrospector.selectInvocableMethod(Method, Class)

isEqualsMethod

public static boolean isEqualsMethod(Method method)

Determine whether the given method is an "equals" method.

See Also:

Object.equals(java.lang.Object)

isHashCodeMethod

public static boolean isHashCodeMethod(Method method)

Determine whether the given method is a "hashCode" method.

See Also:

Object.hashCode()

isToStringMethod

public static boolean isToStringMethod(Method method)

Determine whether the given method is a "toString" method.

See Also:

Object.toString()

isFinalizeMethod

public static boolean isFinalizeMethod(Method method)

Determine whether the given method is a "finalize" method.

See Also:

Object.finalize()

getMostSpecificMethod

public static Method getMostSpecificMethod(Method method,
                                           Class<?> targetClass)

Given a method, which may come from an interface, and a target class used in the current AOP invocation, find the corresponding target method if there is one. E.g. the method may be IFoo.bar() and the target class may be DefaultFoo. In this case, the method may be DefaultFoo.bar(). This enables attributes on that method to be found.

NOTE: In contrast to ClassUtils.getMostSpecificMethod(java.lang.reflect.Method, java.lang.Class<?>), this method resolves Java 5 bridge methods in order to retrieve attributes from the original method definition.

Parameters:

method - the method to be invoked, which may come from an interface

targetClass - the target class for the current invocation. May be null or may not even implement the method.

Returns:

the specific target method, or the original method if the targetClass doesn't implement it or is null

See Also:

ClassUtils.getMostSpecificMethod(java.lang.reflect.Method, java.lang.Class<?>)

canApply

public static boolean canApply(Pointcut pc,
                               Class<?> targetClass)

Can the given pointcut apply at all on the given class?

This is an important test as it can be used to optimize out a pointcut for a class.

Parameters:

pc - the static or dynamic pointcut to check

targetClass - the class to test

Returns:

whether the pointcut can apply on any method

canApply

public static boolean canApply(Pointcut pc,
                               Class<?> targetClass,
                               boolean hasIntroductions)

Can the given pointcut apply at all on the given class?

This is an important test as it can be used to optimize out a pointcut for a class.

Parameters:

pc - the static or dynamic pointcut to check

targetClass - the class to test

hasIntroductions - whether or not the advisor chain for this bean includes any introductions

Returns:

whether the pointcut can apply on any method

canApply

public static boolean canApply(Advisor advisor,
                               Class<?> targetClass)

Can the given advisor apply at all on the given class? This is an important test as it can be used to optimize out a advisor for a class.

Parameters:

advisor - the advisor to check

targetClass - class we're testing

Returns:

whether the pointcut can apply on any method

canApply

public static boolean canApply(Advisor advisor,
                               Class<?> targetClass,
                               boolean hasIntroductions)

Can the given advisor apply at all on the given class?

This is an important test as it can be used to optimize out a advisor for a class. This version also takes into account introductions (for IntroductionAwareMethodMatchers).

Parameters:

advisor - the advisor to check

targetClass - class we're testing

hasIntroductions - whether or not the advisor chain for this bean includes any introductions

Returns:

whether the pointcut can apply on any method

findAdvisorsThatCanApply

public static List<Advisor> findAdvisorsThatCanApply(List<Advisor> candidateAdvisors,
                                                     Class<?> clazz)

Determine the sublist of the candidateAdvisors list that is applicable to the given class.

Parameters:

candidateAdvisors - the Advisors to evaluate

clazz - the target class

Returns:

sublist of Advisors that can apply to an object of the given class (may be the incoming List as-is)

invokeJoinpointUsingReflection

public static Object invokeJoinpointUsingReflection(Object target,
                                                    Method method,
                                                    Object[] args)
                                             throws Throwable

Invoke the given target via reflection, as part of an AOP method invocation.

Parameters:

target - the target object

method - the method to invoke

args - the arguments for the method

Returns:

the invocation result, if any

Throws:

Throwable - if thrown by the target method

AopInvocationException - in case of a reflection error