xstream - 在自定义转换器中重用默认转换器
我正在使用 xstream 处理 xml 字符串，但对象的某些字段在版本之间发生了变化，所以我正在实现 自定义转换器。下面列出了字段更改的摘要，只有前两个字段类型不同。
Field type1 type2
a short String
b String Object
c List List
d Object Object
.
.
.
x String String
我当前的转换器是为了专门处理每个字段而实现的，这导致 unmarshal() 方法中存在大量“else if”条件
package a.b.c.reports;
import com.thoughtworks.xstream.converters.Converter;
import com.thoughtworks.xstream.converters.MarshallingContext;
import com.thoughtworks.xstream.converters.UnmarshallingContext;
import com.thoughtworks.xstream.io.HierarchicalStreamReader;
import com.thoughtworks.xstream.io.HierarchicalStreamWriter;
public class MyConverter implements Converter {
..
@Override
public Object unmarshal(HierarchicalStreamReader reader,UnmarshallingContext context) {
while (reader.hasMoreChildren()) {
reader.moveDown();
if(reader.getNodeName().equals("a"))
{
a = reader.getValue();
}
else if (reader.getNodeName().equals("b"))
{
b = (Object) context.convertAnother(reader, Object.class);
}
else if(reader.getNodeName().equals("c"))
{
a = reader.getValue();
}
..
..
}
}
是否有更智能的方法来委托处理类型未更改为默认值的字段xstream转换器？
I'm using xstream to process an xml string but some fields of the object have changed between versions, so i'm implementing
a custom converter. A summary of the field changes is listed below, and only the first two field types are different.
Field type1 type2
a short String
b String Object
c List List
d Object Object
.
.
.
x String String
My current converter is implemented to handle each of the fields specifically, which leads to a large number of 'else if' conditions within the unmarshal() method
package a.b.c.reports;
import com.thoughtworks.xstream.converters.Converter;
import com.thoughtworks.xstream.converters.MarshallingContext;
import com.thoughtworks.xstream.converters.UnmarshallingContext;
import com.thoughtworks.xstream.io.HierarchicalStreamReader;
import com.thoughtworks.xstream.io.HierarchicalStreamWriter;
public class MyConverter implements Converter {
..
@Override
public Object unmarshal(HierarchicalStreamReader reader,UnmarshallingContext context) {
while (reader.hasMoreChildren()) {
reader.moveDown();
if(reader.getNodeName().equals("a"))
{
a = reader.getValue();
}
else if (reader.getNodeName().equals("b"))
{
b = (Object) context.convertAnother(reader, Object.class);
}
else if(reader.getNodeName().equals("c"))
{
a = reader.getValue();
}
..
..
}
}
Is there a smarter way to delegate the processing of fields who's types have not changed to the default xstream converter?
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这个问题有点陈旧，但我还是花了一些时间来收集这些信息。
简单的解决方案是扩展
ReflectionConverter而不是实现原始Converter接口。ReflectionConverter是 XStream 中的默认转换器，因此请覆盖所需的内容并super其他所有内容。然后new XStream().register你的新转换器就可以了。The question is a bit stale, but nevertheless took me some time to gather the bits.
Simple solution to that is to extend the
ReflectionConverterinstead of implementing the rawConverterinterface.ReflectionConverteris the default converter in the XStream so override what's needed andsupereverything else. Thennew XStream().registeryour new converter and you're good.