Eclipse调试器和集合 [英] Eclipse debugger and collections

问题描述

我有一些我想在Eclipse调试器中分析的集合。我对每个元素的特定属性感兴趣。

让我们举个例子，列出一个 Person s每个都有一个地址属性，后者又有一个 city 属性）。在调试器中，我可以查看每个元素，或者查看 list.get（i）.address.city 。

<对于大型建筑物来说，这不是很有帮助。有可能应用一个函数到数据结构，类似于Perl中的 map 函数（在调试器中不在代码中）。

输入将是我的列表，我感兴趣的路径（Person.address.city），输出一个列表，只有选定的元素（与我的示例的城市列表）。 / p>

在Perl中：

  map {$ _-> {address }  - > {city}} @list 
  

修改

我可以使用详细格式化程序生成 String ：

  StringBuilder sb = new StringBuilder（）; 
 for（Person p：this）{
 sb.append（p.address.city（））; 
 sb.append（，）; 
} 
 return sb.toString（）; 
  

这将格式化我的列表，只需要我感兴趣的元素（作为一个

尽管它走向正确的方向，但如果我可以返回一个新的列表，那将是很好的，我可以用调试器分析。

解决方案

我认为，Eclipse Debugger功能你感兴趣被称为逻辑结构。您可以在Eclipse首选项（Java / Debug / Logical结构）中定义一个逻辑结构，您可以在其中编写这样的表达式（希望），然后在变量视图上，您​​可以在弹出菜单中替换列表的显示。

看到这篇博客文章的基本想法： http://www.javalobby.org/forums/thread.jspa?threadID=16736&messageID=91823528

I have some collections that I would like to analyze in the Eclipse debugger. I am interested in a particular attribute of each element.

Let's take an example with a list of Persons (each one with an address attribute which in turn has a city attribute). In the debugger I can either look at each element or look at list.get(i).address.city.

Doing this for large structures is not really helpful. Is there the possibility to apply a function to a data structure, something similar to the map function in Perl (in the debugger not in the code).

The input would be my list with the path I am interested in (Person.address.city), the output a list with just the selected elements (a list of cities with my example).

In Perl:

map { $_->{address}->{city} } @list

Edit

I am able to generate a String with a Detail Formatter:

StringBuilder sb = new StringBuilder();
for (Person p : this) {
    sb.append(p.address.city());
    sb.append(", ");
}
return sb.toString();

This will format my list with just the elements I am interested in (as a String).

Although it goes in the right direction it would be nice if I could return a new List that I can analyze with the debugger.

解决方案

I think, the Eclipse Debugger feature you are interested is called logical structures. You could define a logical structure in Eclipse preferences (Java/Debug/Logical structures), where you could write such an expression (hopefully), and then on the variables view you could replace the display of the list in the pop-up menu.

See this blog post for basic ideas: http://www.javalobby.org/forums/thread.jspa?threadID=16736&messageID=91823528

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