深入Java设计模式之责任链模式

package com.lzhsite.technology.designPattern.chainms;
public class MainTest {
  public static void main(String[] args) {
    Client mClient = new Client();
    Approver GroupLeader = new GroupApprover("Tom");
    Approver VicePresident = new VicePresidentApprover("Kate");
    Approver DepartmentLeader = new DepartmentApprover("Jerry");
    Approver President = new PresidentApprover("Bush");
    GroupLeader.SetSuccessor(DepartmentLeader);
    DepartmentLeader.SetSuccessor(VicePresident);
    VicePresident.SetSuccessor(President);
    President.SetSuccessor(GroupLeader);
    VicePresident.ProcessRequest(mClient.sendRequst(1, 100, 40));
    VicePresident.ProcessRequest(mClient.sendRequst(2, 200, 40));
    VicePresident.ProcessRequest(mClient.sendRequst(3, 300, 40));
    VicePresident.ProcessRequest(mClient.sendRequst(4, 400, 140));
  }
}

package com.lzhsite.technology.designPattern.chainms;
public abstract class Approver {
   Approver successor;
   String Name;
  public Approver(String Name)
  {
    this.Name=Name;
  }
  public abstract void ProcessRequest( PurchaseRequest request);
  public void SetSuccessor(Approver successor) {
    // TODO Auto-generated method stub
    this.successor=successor;
  }
}

package com.lzhsite.technology.designPattern.chainms;
/**
 * 组内领导审批
 * @author lzhcode
 *
 */
public class GroupApprover extends Approver {
  public GroupApprover(String Name) {
    super(Name+" GroupLeader");
    // TODO Auto-generated constructor stub
  }
  @Override
  public void ProcessRequest(PurchaseRequest request) {
    // TODO Auto-generated method stub
    if (request.GetSum() < 5000) {
      System.out.println("**This request " + request.GetID()
          + " will be handled by "
          + this.Name + " **");
    } else {
      successor.ProcessRequest(request);
    }
  }
}

package com.lzhsite.technology.designPattern.chainms;
/**
 * 部门领导审批
 * @author lzhcode
 *
 */
public class DepartmentApprover extends Approver {
  public DepartmentApprover(String Name) {
    super(Name + " DepartmentLeader");
  }
  @Override
  public void ProcessRequest(PurchaseRequest request) {
    // TODO Auto-generated method stub
    if ((5000 <= request.GetSum()) && (request.GetSum() < 10000)) {
      System.out.println("**This request " + request.GetID()
          + " will be handled by " + this.Name + " **");
    } else {
      successor.ProcessRequest(request);
    }
  }
}

package com.lzhsite.technology.designPattern.chainms;
/**
 * 副总经理审批
 * @author lzhcode
 *
 */
public class VicePresidentApprover extends Approver {
  public VicePresidentApprover(String Name) {
    super(Name + " Vice President");
  }
  @Override
  public void ProcessRequest(PurchaseRequest request) {
    // TODO Auto-generated method stub
    if ((10000 <= request.GetSum()) && (request.GetSum() < 50000)) {
      System.out.println("**This request " + request.GetID()
          + " will be handled by " + this.Name + " **");
    } else {
      successor.ProcessRequest(request);
    }
  }
}

package com.lzhsite.technology.designPattern.chainms;
/**
 * 副总经理审批
 * @author lzhcode
 *
 */
public class VicePresidentApprover extends Approver {
  public VicePresidentApprover(String Name) {
    super(Name + " Vice President");
  }
  @Override
  public void ProcessRequest(PurchaseRequest request) {
    // TODO Auto-generated method stub
    if ((10000 <= request.GetSum()) && (request.GetSum() < 50000)) {
      System.out.println("**This request " + request.GetID()
          + " will be handled by " + this.Name + " **");
    } else {
      successor.ProcessRequest(request);
    }
  }
}

package com.lzhsite.technology.designPattern.chainms;
public class Client {
  public Client() {
  }
  public PurchaseRequest sendRequst(int Type, int Number, float Price) {
    return new PurchaseRequest(Type, Number, Price);
  }
}

package com.lzhsite.technology.designPattern.chainms;
public class PurchaseRequest {
  private int Type = 0;
  private int Number = 0;
  private float Price = 0;
  private int ID = 0;
  public PurchaseRequest(int Type, int Number, float Price) {
    this.Type = Type;
    this.Number = Number;
    this.Price = Price;
  }
  public int GetType() {
    return Type;
  }
  public float GetSum() {
    return Number * Price;
  }
  public int GetID() {
    return (int) (Math.random() * 1000);
  }
}