spring的pointcut正则表达式的实现

CLASS_PATH = "((\\*?\\w+\\*?|\\*)\\.)*(\\*?\\w+\\*?|\\*)";

public class PointcutUtils {
    private static final String ACCESS_MODIFIER = "(public|private|protected|default|\\*)";

    private static final String RETURN_TYPE;

    private static final String CLASS_PATH = "((\\*?\\w+\\*?|\\*)\\.)*(\\*?\\w+\\*?|\\*)";

    private static final String METHOD_NAME = "(\\*?\\w+\\*?|\\*)";

    private static final String PARAM_LIST ;

    private static final String EXECUTION ;
    //基础类型
    private static final String BASIC_TYPE="(byte|char|boolean|short|int|long|double|float)";
    //参数类型
    private static final String PARAM_TYPE;


    static{
        //参数类型：基础类型 + Object + 数组类型
        PARAM_TYPE = "("+BASIC_TYPE+"|[A-Z]\\w*)(\\[\\])*";
        //返回值类型：void  + 参数类型
        RETURN_TYPE="(void|"+PARAM_TYPE+"|\\*)";
        //参数列表
        PARAM_LIST = "(\\.\\.|"+PARAM_TYPE+"(\\s*,\\s*"+PARAM_TYPE+")*" +"|)";
        //execution表达式
        EXECUTION = "\\s*execution\\s*\\(\\s*"+ACCESS_MODIFIER+"\\s+"+RETURN_TYPE+"\\s+"+CLASS_PATH+"\\s+"+METHOD_NAME+"\\(\\s*"+PARAM_LIST+"\\s*\\)\\s*"+"\\s*\\)\\s*";

    }
	//检测pointcut是否是正确的
    static boolean  checkPointcut(String pointcutReg){
        return pointcutReg == null ? false : pointcutReg.matches(EXECUTION);
    }

}

        String pointcut = "execution ( default int[][] * rr( .. ) ) ";
        //default访问修饰符，int[][]二维数组 ；
        // * 不限定类名； rr 方法名； .. 任意类型的参数列表；符合定义的规则，预期结果为 true
        boolean correct = PointcutUtils.checkPointcut(pointcut );
        System.out.println(correct);//结果：true

	//拆分pointcut
    public static Pointcut parsePointcut(String pointcut){
        if(!checkPointcut(pointcut))throw new IllegalArgumentException("execution grammar fORMat error.");
        String exeReg = getBracketStr(pointcut);//获取execution();中括号包裹的部分；
        String paramList = getBracketStr(exeReg).replaceAll(" ","");
        int start = exeReg.indexOf("(");
        exeReg = exeReg.substring(0,start);
        String[] regs = exeReg.split("\\s+");
        String acceSSModifier = regs[0];
        String returnType = regs[1];
        String classPath = regs[2];
        String methodName = regs[3];
        return new Pointcut(accessModifier,returnType,classPath,methodName,paramList);
    }
    static String getBracketStr(String str){
        int start = str.indexOf("(");
        int end = str.lastIndexOf(")");
        return str.substring(start+1,end).trim();
    }

 public static boolean matchClass(Pointcut pointcut,Class cla){
        if(pointcut.getClassPath().equals("*"))return true;
        return cla.getTypeName().matches(pointcut.getClassPath().replaceAll("\\*","\\\\w*").replaceAll("\\.","\\\\."));
    }

   public static boolean matchMethod(Pointcut pointcut, Method method){
       return matchModifier(pointcut.getAccessModifier(),method) &&
              matchReturnType(pointcut.getReturnType(),method) &&
              matchMethodName(pointcut.getMethodName(),method) &&
              matchParamList(pointcut.getParamList(),method);


   }

   static boolean matchModifier(String modifier,Method method){
       int modifiers = method.getModifiers();
        switch (modifier){
            case "default"  :return method.isDefault();
            case "public"   :return Modifier.isPublic(modifiers);
            case "private"  :return Modifier.isPrivate(modifiers);
            case "protected":return Modifier.isProtected(modifiers);
            case "*"        :return true;
            default:
                return false;
        }
   }

   static boolean matchReturnType(String returnType,Method method){
        if(returnType.equals("*"))return true;
       return returnType.equals(method.getReturnType().getSimpleName());
   }

   static boolean matchMethodName(String name,Method method){
        if(name.equals("*"))return true;
        return method.getName().matches(name.replaceAll("\\*","\\\\w*"));
   }

   static boolean matchParamList(String paramList,Method method){

        if(paramList.equals(".."))return true;

       Class<?>[] parameterTypes = method.getParameterTypes();
       if((paramList.equals("")) ){
           if( parameterTypes.length == 0 )return true;
           else return false;
       }
       StringBuilder methodParamList = new StringBuilder();
       for (Class<?> parameterType : parameterTypes) {
           methodParamList.append(","+parameterType.getSimpleName());
       }
        String methodParam =  methodParamList.toString().substring(1);
        return methodParam.equals(paramList);

   }