使用Spring的PointCuts类完成一个重用的Pointcut交集并集工具类

package PointCuts;

import java.util.Iterator;
import java.util.Map;

import org.springframework.aop.ClassFilter;
import org.springframework.aop.MethodMatcher;
import org.springframework.aop.Pointcut;
import org.springframework.aop.framework.AopConfigException;
import org.springframework.aop.support.ControlFlowPointcut;
import org.springframework.aop.support.Pointcuts;

public class PointCutUtils implements Pointcut ...{
    private Pointcut pointcut;
    private Map pointcuts;
    public ClassFilter getClassFilter() ...{
        
        return getPointCut().getClassFilter();
    }

    public MethodMatcher getMethodMatcher() ...{
        return getPointCut().getMethodMatcher();
    }
    
    public void setPointCuts(Map pointcuts)...{
        
        if(pointcuts==null||pointcuts.size()==0)...{
            throw new AopConfigException("至少要设置一个PointCut");
        }
        pointcut=(Pointcut)pointcuts.get(0);
        Iterator  it=pointcuts.entrySet().iterator();   
        while(it.hasNext())   
        ...{   
          Map.Entry  entry=(Map.Entry)it.next();   
          String   key=(String)entry.getKey();   
          Pointcut pc=(Pointcut)entry.getValue();
          if(key.equals("union"))...{
              union(pc);
          }
          else if(key.equals("intercept"))...{
              intercept(pc);
          }
         }
    }
    
    
    private  void union(Pointcut pc)...{
        pointcut=Pointcuts.union(pointcut, pc);
    }
    
    private  void intercept(Pointcut pc)...{
        pointcut=Pointcuts.intersection(pointcut, pc);
    }
    
    private Pointcut getPointCut()...{
        if(pointcut==null)...{
            throw new AopConfigException("没有设置pointcut");
        }
        else...{
            return pointcut;
        }
        
    }

}