XStream：如何在自定义转换器中编组/解组列表？

发布于 2024-09-25 13:21:48 字数 548 浏览 4 评论 0原文

我有以下使用自定义转换器序列化的类（旧版；不可注释）：

class Test {

    // some other variables

    List<SomeType> someTypeList;

}

已经可以使用 SomeType 正常工作的转换器。但是我希望序列化列表，就像用 @XStreamAlias("someTypes") 注释一样。

最后，我期望 someTypeList 具有以下格式：

<someTypes class="list-type">
    <someType>
        ....
    </someType>
    ...
</someTypes>

如何实现 marshal/unmarshal 方法才能获得所需的输出？调用 context.convertAnother(someTypeList) 不会产生预期结果，因为周围的标记丢失。

原文

I have the following class (legacy; not annotatable) that is serialized with a custom converter:

class Test {

    // some other variables

    List<SomeType> someTypeList;

}

A properly working converter for SomeType is already available. However I want the list to be serialized as if it was annotated with @XStreamAlias("someTypes").

In the end I expect the following format for someTypeList:

<someTypes class="list-type">
    <someType>
        ....
    </someType>
    ...
</someTypes>

How do I have to implement the marshal/unmarshal method to get the desired output? Calling context.convertAnother(someTypeList) didn't yield the expected result as the surrounding <someTypes> tag was missing.

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阳光的暖冬 2024-10-02 13:21:48

明智的做法是获取结构：

<someTypes class="list-type">  
<someType>  
....  
</someType>  
...  
</someTypes>

看下面的代码。对于您的列表，您需要标记：

@XStreamImplicit(itemFieldName="someType")  
List<someType>List;

现在，根据您内部的内容，您可能需要创建一个自定义转换器。要引用它，您可以像这样进行更改：

@XStreamImplicit(itemFieldName="someType")  @XStreamConverter(YourOwnConverter.class)  
List<SomeType> someTypeList;

然后创建一个转换器类（YourOwnConverter），该类将知道如何取消/封送：

public boolean canConvert(Class type) 
{
    return type.equals(SomeType.class);
}

public void marshal(Object source, HierarchicalStreamWriter writer, MarshallingContext context) 
{
    SomeType mytype = (SomeType) source;
    writer.addAttribute("position", mytype.getPosition());
    writer.setValue(mytype.getId());
}
public Object unmarshal(HierarchicalStreamReader reader, UnmarshallingContext context) 
{
    SomeType mytype = new SomeType();
    String position =  reader.getAttribute("position");
    ......  
        return mytype ;
}

使用此示例：
http://x-stream.github.io/converter-tutorial.html

You wise to get the structure:

<someTypes class="list-type">  
<someType>  
....  
</someType>  
...  
</someTypes>

Look at the following code. For your list you need to tag:

@XStreamImplicit(itemFieldName="someType")  
List<someType>List;

Now, depending on what you got inside, you might need to create a custom converter. To refer to that you change a bit like this:

@XStreamImplicit(itemFieldName="someType")  @XStreamConverter(YourOwnConverter.class)  
List<SomeType> someTypeList;

Then create a converter class (YourOwnConverter) that would know how to un/marshal:

public boolean canConvert(Class type) 
{
    return type.equals(SomeType.class);
}

public void marshal(Object source, HierarchicalStreamWriter writer, MarshallingContext context) 
{
    SomeType mytype = (SomeType) source;
    writer.addAttribute("position", mytype.getPosition());
    writer.setValue(mytype.getId());
}
public Object unmarshal(HierarchicalStreamReader reader, UnmarshallingContext context) 
{
    SomeType mytype = new SomeType();
    String position =  reader.getAttribute("position");
    ......  
        return mytype ;
}

Use this as example:
http://x-stream.github.io/converter-tutorial.html

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