Package 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:

  • Constructor Summary

    Constructors
    Constructor
    Description
    AopUtils()
     

  • Method Summary

    Modifier and Type
    Method
    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 an 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 Details

    • AopUtils

      public AopUtils()

  • Method Details

    • isAopProxy

      public static boolean isAopProxy(@Nullable 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

      public static boolean isJdkDynamicProxy(@Nullable 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:

    • isCglibProxy

      public static boolean isCglibProxy(@Nullable 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:

    • 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:

    • selectInvocableMethod

      public static Method selectInvocableMethod(Method method, @Nullable 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:

    • isEqualsMethod

      public static boolean isEqualsMethod(@Nullable Method method)
      Determine whether the given method is an "equals" method.
      See Also:

    • isHashCodeMethod

      public static boolean isHashCodeMethod(@Nullable Method method)
      Determine whether the given method is a "hashCode" method.
      See Also:

    • isToStringMethod

      public static boolean isToStringMethod(@Nullable Method method)
      Determine whether the given method is a "toString" method.
      See Also:

    • isFinalizeMethod

      public static boolean isFinalizeMethod(@Nullable Method method)
      Determine whether the given method is a "finalize" method.
      See Also:

    • getMostSpecificMethod

      public static Method getMostSpecificMethod(Method method, @Nullable 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 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 (can be null or may not even implement the method)
      Returns:
      the specific target method, or the original method if the targetClass does not implement it
      See Also:

    • 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 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 an 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 an 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 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

      @Nullable public static Object invokeJoinpointUsingReflection(@Nullable 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