[英]Java castor using custom field handlers
I have been trying to write a custom field handler which returns the hash code of a java.awt.Image object when writing to XML and retrieves an image based on this hash code when binding the XML to an object. I have been trying to write a custom field handler which returns the hash code of a java.awt.Image object when writing to XML and retrieves an image based on this hash code when binding the XML to an object. For some reason, I can't get this to work;出于某种原因,我无法让它工作; castor, from what I can tell, simply instantiates the field handler and then doesn't call any of its methods.据我所知,castor 只是实例化了字段处理程序,然后不调用它的任何方法。
Can you give me a quick example of how to do this because I must be missing something simple!你能给我一个快速的例子来说明如何做到这一点,因为我一定错过了一些简单的东西!
Cheers,干杯,
Pete皮特
Pasting your code can be a good idea.粘贴代码可能是个好主意。 Anyway following works fine for me无论如何,以下对我来说很好
<m:class name="someClass">
<m:map-to xml="class"/>
<m:field name="lineColor" type="java.awt.Color" handler="ColorFieldHandler">
<m:bind-xml name="lineColor" node="attribute"/>
</m:field>
</m:class>
And the handler itself和处理程序本身
public class ColorFieldHandler extends GeneralizedFieldHandler {
public Object convertUponGet(Object value) {
if (value == null) {
return null;
}
Integer colorHash = (Integer) value;
...
Hope that helps希望有帮助
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