Source code: com/ghettojedi/aop/aspect/Invocation.java

   package com.ghettojedi.aop.aspect;
   
   import java.lang.reflect.InvocationTargetException;
   import java.lang.reflect.Method;
   import java.util.List;
   import java.util.ListIterator;
   
   public class Invocation {
       private ListIterator interceptors;
      private Object target;
      private String methodName;
      private Object[] arguments;
      private Method method;
  
      Invocation(List interceptors, Object target, String methodName, Class[] parameterTypes, Object[] arguments) {
          this.interceptors = interceptors.listIterator();
          this.target = target;
          this.methodName = methodName;
          this.arguments = arguments;
          this.method = getMethod(parameterTypes);
      }
  
      public Object getTarget() {
          return target;
      }
  
      public Class getTargetClass() {
          return target.getClass();
      }
  
      public String getMethodName() {
          return methodName;
      }
  
      public Object[] getArguments() {
          return arguments;
      }
  
      public Object proceed() throws Throwable {
          if (interceptors.hasNext()) {
              return invokeNext();
          } else {
              return invokeTarget();
          }
      }
  
      private Object invokeNext() throws Throwable {
          return ((Interceptor) interceptors.next()).invoke(this);
      }
  
      private Object invokeTarget() throws Throwable {
          try {
              return method.invoke(target, arguments);
          } catch (InvocationTargetException e) {
              throw e.getCause();
          }
      }
  
      private Method getMethod(Class[] parameterTypes) {
          try {
              return getTargetClass().getMethod(Delegator.getHiddenMethodName(methodName), parameterTypes);
          } catch (NoSuchMethodException e) {
              throw new Error("Internal AOP Error: An Invocation was created for a method that doesn't exist: " + methodName);
          }
      }
  }