Java Swing，Corba对象 - 如何在DefaultListModel中存储Corba对象？ [英] Java Swing, Corba Objects - How to store Corba objects in DefaultListModel?

问题描述

我有这样的IDL接口：

  interface User 
 {
 string toString 
 // .. 
}; 
 
 interface Group 
 {
 typedef sequence< User>用户; 
用户getUsers（）; 
 
}; 
  

当我将它翻译成C ++时，我得到了这样的结果：

  // ... 
 Group :: Users * GroupImpl :: getUsers（）
 {
 // of'User'-objects 
} 
  

在客户端显示我的用户。我这样做：

  public void showAllUsers（）
 {
 User [] users = interface_obj .getUsers（）; 
 if（users.length！= 0）
 {
 DefaultListModel model = new DefaultListModel（）; 
 for（int i = 0; i< users.length; i ++）
 model.addElement（users [i]）; 
 this.usersList.setModel（model）; 
} 
} 
  

this.usersList是 JList 。

当我这样写时，我只看到我的Users对象的IOR：

IOR：0123405948239481293812312903891208320131293812381023
IOR：0092930912617819919191818173666288810010199181919919


等等...

如何做到这一点，看到他们的toString在DefaultListModel中的表示？我不想这样做：

model.addElement（users [i] .toString（））;

这不是重点。当我使用RMI而不是CORBA时， model.addElement（users [i]）; 正是我需要的，因为我看到用户字符串表示。
但是我需要使用CORBA并存储在DefaultListModel corba-user- 对象中，而不是字符串。请帮助。

解决方案

一种方法是创建一个UserView类，模型：

  public class UserView {
 
 private final User corbaUser; 
 
 public UserView（User corbaUser）{
 this.corbaUser = corbaUser 
} 
 
 @Override 
 public String toString（）{
 String ret = null; 
 //根据需要构造字符串
 return ret; 
} 
} 
  

编辑：

如JB Nizet指出的那样，要小心你放在toString（）中的代码，因为每次需要显示列表时都会调用它 - 或者最新数据的显示可能正是你想要的。

I have such IDL interface:

interface User
{
    string toString();
    //..
};

interface Group
{
    typedef sequence<User> Users;
    Users getUsers();

};

When I translated it to C++ I got sth like this:

// ...
Group::Users* GroupImpl::getUsers()
{
    // ..return sequence of 'User'-objects
}

On client side (written in Java) I want to show my users. I do sth like this:

public void showAllUsers() 
{
    User[] users = interface_obj.getUsers();
    if(users.length != 0)
    {
        DefaultListModel model = new DefaultListModel();
        for(int i=0; i<users.length; i++)
            model.addElement(users[i]);
        this.usersList.setModel(model);
    }
}

this.usersList is a JList.

When I do this like I wrote, I see only IORs of my Users-object:

IOR :0123405948239481293812312903891208320131293812381023
IOR: 0092930912617819919191818173666288810010199181919919

and so on ...

How to make it that way, to see their toString(); representation in DefaultListModel? I dont want to do this:

model.addElement(users[i].toString());

thats not the point. When I use RMI instead of CORBA, model.addElement(users[i]); is exactly what I need cause I see users string representation. But I need to use CORBA and store in DefaultListModel corba-user-objects, not strings. Please, help.

解决方案

One way to do it would be to make a UserView class whose instances you'd put in the list model:

public class UserView {

    private final User corbaUser;

    public UserView(User corbaUser) {
        this.corbaUser = corbaUser
    }

    @Override
    public String toString() {
       String ret = null;
       // construct the string as you want here
       return ret;
    }
}

EDIT:

as pointed out by JB Nizet be careful with the code you put in toString() since it is called every time the list needs to be shown - or the showing of the freshest data might be exactly what you want.

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