customermanager.java

用j2ee开发的一个旅店管理系统

package com.xc.hotelmanager.hotel.control.proxy;

import java.util.*;

import com.xc.hotelmanager.hotel.model.*;
import com.xc.hotelmanager.hotel.control.*;
import com.xc.hotelmanager.hotel.exception.*;
import java.lang.NullPointerException;
import java.rmi.*;
import com.xc.hotelmanager.hotel.control.session.SB_CustomerManager;


public class CustomerManager {
  static CustomerManager instance = null;
  private SB_CustomerManager manager = null;
  private CustomerManager() {
    try {
      manager =EjbGetter.getSB_CustomerManagerHome().
          create();
    }
    catch (Exception ex) {
    }
  }

  public static CustomerManager getInstance() {
    if (instance == null) {
      instance = new CustomerManager();
    }
    return instance;
  }

  public Customer loadCustomer(String cid) throws HotelManagerException {
    Customer result = null;
    try {
      result = manager.loadCustomer(cid);
    }
    catch (Exception rex) {
      throw new HotelManagerException("CustomerManager.load Eorr:"+rex.getMessage());
    }
    return result;
  }

  public Customer existCustomer(String cid) throws HotelManagerException {
    Customer result = null;
    try {
      result = manager.exitCustomer(cid);
    }
    catch(java.lang.NullPointerException ex){
      System.out.println("该顾客不存在----可不写？？"+ex.getMessage());
      result=null;
    }
    catch (Exception rex) {
      if (result == null) {
        result = null;
      }
      else {
        throw new HotelManagerException("CustomerManager.exist Eorr:" +
                                        rex.getMessage());
      }
    }
    return result;
  }

    public Collection getAllCustomer() throws HotelManagerException {
      try {
        Collection result = manager.getAllCustomer();
        return result;
      }
      catch (Exception rex) {
        throw new HotelManagerException(rex.getMessage());
      }
    }

    public void removeCustomer(String cid) throws HotelManagerException {
      try {
        manager.removeCustomer(cid);
      }
      catch (Exception rex) {
        throw new HotelManagerException(rex.getMessage());
      }

    }

    public Customer addCustomer(Customer cus) throws HotelManagerException {
      try {
        return manager.addCustomer(cus);
      }
      catch (Exception rex) {
        throw new HotelManagerException("CustomerManager.add Eorr:"+rex.getMessage());
      }

    }

    public Customer saveCustomer(Customer cus) throws HotelManagerException {
      try {
        return manager.saveCustomer(cus);
      }
      catch (Exception rex) {
        throw new HotelManagerException("CustomerManager.save Eorr:"+rex.getMessage());
      }

    }

    public static void main(String[] args) {
      try {
        CustomerManager m = CustomerManager.getInstance();
      }
      catch (Exception ex) {
        System.out.println("CustomerManager.main Eorr:"+ex.getMessage());
      }
    }
  }