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   package org.codehaus.nanning.config;
   
   import org.codehaus.nanning.AspectException;
   import org.codehaus.nanning.AspectInstance;
   import org.codehaus.nanning.Mixin;
   
   public class MixinAspect extends AbstractAspect {
       protected Class interfaceClass;
       protected Class targetClass;
      protected Pointcut pointcut;
  
      public MixinAspect(Class interfaceClass, Class targetClass, Pointcut pointcut) {
          this.interfaceClass = interfaceClass;
          this.targetClass = targetClass;
          this.pointcut = pointcut;
      }
  
      public MixinAspect(Class interfaceClass, Class targetClass) {
          this(interfaceClass, targetClass, P.isClass(interfaceClass));
      }
  
      public void introduce(AspectInstance aspectInstance) {
          if (shouldIntroduce(aspectInstance)) {
              Mixin mixinInstance = new Mixin();
              mixinInstance.setInterfaceClass(interfaceClass);
              if (targetClass != null) {
                  try {
                      mixinInstance.setTarget(targetClass.newInstance());
                  } catch (Exception e) {
                      throw new AspectException("could not instantiate target " + e);
                  }
              }
              aspectInstance.addMixin(mixinInstance);
          }
      }
  
      public boolean shouldIntroduce(AspectInstance aspectInstance) {
          return pointcut.introduceOn(aspectInstance);
      }
  
      public Class getInterfaceClass() {
          return interfaceClass;
      }
  
      public Class getTargetClass() {
          return targetClass;
      }
  }