TestServlet.java

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package test;

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;

public class TestServlet extends HttpServlet {

    public void doGet(HttpServletRequest req, HttpServletResponse res)
            throws IOException, ServletException {

        ServletRequestWrapper reqWrapper1 = new SubFirstLevelRequestWrapper(req);
        ServletRequestWrapper reqWrapper2 = new SecondLevelRequestWrapper(reqWrapper1);
        ServletRequestWrapper reqWrapper3 = new ThirdLevelRequestWrapper(reqWrapper2);
       
        if (!reqWrapper3.isWrapperFor(reqWrapper1) ||
                !reqWrapper3.isWrapperFor(FirstLevelRequestWrapper.class)) {
            throw new ServletException("Unexpected result");
        }

        MyRequestWrapper myReqWrapper = new MyRequestWrapper(req);

        if (reqWrapper3.isWrapperFor(myReqWrapper) ||
                reqWrapper3.isWrapperFor(MyRequestWrapper.class)) {
            throw new ServletException("Unexpected result");
        }

        ServletResponseWrapper resWrapper1 = new SubFirstLevelResponseWrapper(res);
        ServletResponseWrapper resWrapper2 = new SecondLevelResponseWrapper(resWrapper1);
        ServletResponseWrapper resWrapper3 = new ThirdLevelResponseWrapper(resWrapper2);
       
        if (!resWrapper3.isWrapperFor(resWrapper1) ||
                !resWrapper3.isWrapperFor(FirstLevelResponseWrapper.class)) {
            throw new ServletException("Unexpected result");
        }

        MyResponseWrapper myResWrapper = new MyResponseWrapper(res);

        if (resWrapper3.isWrapperFor(myResWrapper) ||
                resWrapper3.isWrapperFor(MyResponseWrapper.class)) {
            throw new ServletException("Unexpected result");
        }

    }

    static class FirstLevelRequestWrapper extends ServletRequestWrapper {
        public FirstLevelRequestWrapper(ServletRequest req) {
            super(req);
        }
    }

    static class SubFirstLevelRequestWrapper extends FirstLevelRequestWrapper {
        public SubFirstLevelRequestWrapper(ServletRequest req) {
            super(req);
        }
    }

    static class SecondLevelRequestWrapper extends ServletRequestWrapper {
        public SecondLevelRequestWrapper(ServletRequest req) {
            super(req);
        }
    }

    static class ThirdLevelRequestWrapper extends ServletRequestWrapper {
        public ThirdLevelRequestWrapper(ServletRequest req) {
            super(req);
        }
    }

    static class MyRequestWrapper extends ServletRequestWrapper {
        public MyRequestWrapper(ServletRequest req) {
            super(req);
        }
    }

    static class FirstLevelResponseWrapper extends ServletResponseWrapper {
        public FirstLevelResponseWrapper(ServletResponse res) {
            super(res);
        }
    }

    static class SubFirstLevelResponseWrapper extends FirstLevelResponseWrapper {
        public SubFirstLevelResponseWrapper(ServletResponse res) {
            super(res);
        }
    }

    static class SecondLevelResponseWrapper extends ServletResponseWrapper {
        public SecondLevelResponseWrapper(ServletResponse res) {
            super(res);
        }
    }

    static class ThirdLevelResponseWrapper extends ServletResponseWrapper {
        public ThirdLevelResponseWrapper(ServletResponse res) {
            super(res);
        }
    }

    static class MyResponseWrapper extends ServletResponseWrapper {
        public MyResponseWrapper(ServletResponse res) {
            super(res);
        }
    }

}