//这个例子不是很好。
//Hand*er 

interface RequestHandle {

    void handleRequest(Request request);
}


//ConcreteHandler
class HRRequestHandle implements RequestHandle {

    public void handleRequest(Request request) {
        if (request instanceof DimissionRequest) {
            System.out.println("要离职, 人事审批!");
        } 

        System.out.println("请求完成");
    }
}


class PMRequestHandle implements RequestHandle {

    RequestHandle rh;
    
    public PMRequestHandle(RequestHandle rh) {
        this.rh = rh;
    }
    
    public void handleRequest(Request request) {
        if (request instanceof AddMoneyRequest) {
            System.out.println("要加薪, 项目经理审批!");
        } else {
            rh.handleRequest(request);
        }
    }
}

class TLRequestHandle implements RequestHandle {

    RequestHandle rh;
    
    public TLRequestHandle(RequestHandle rh) {
        this.rh = rh;
    }

    public void handleRequest(Request request) {
        if (request instanceof LeaveRequest) {
            System.out.println("要请假, 项目组长审批!");
        } else {
            rh.handleRequest(request);
        }
    }
}


public class DF13_CHAIN{    
    public static void main(String[] args) {
        RequestHandle hr =new HRRequestHandle();
        RequestHandle pm = new PMRequestHandle(hr);
        RequestHandle tl = new TLRequestHandle(pm);
        
        //team leader处理离职请求
        Request request = new DimissionRequest();
        tl.handleRequest(request);
        
        System.out.println("===========");
        //team leader处理加薪请求
        request = new AddMoneyRequest();
        tl.handleRequest(request);
        
        System.out.println("========");
        //项目经理上理辞职请求
        request = new DimissionRequest();
        pm.handleRequest(request);
    }
}