Copy XmlGregorianCalendar to Date

[tgrip]

Hi,

I have a bean which has properties of type XmlGregorianCalendar and
want to convert it to a bean with property of same name of type
java.util.Date. However, the date is null after the conversion.
I added a DateTransformer, and checked in the isTransformable if
toClass.isAssignableFrom(Date.class) and in the transform method I
transform from XmlGregorianCalendar to the date.
What else do I have to do?

Thanks and best regards
Theo

[Hanson Char]

The custom DateTransformer you mentioned should work.   Maybe you can post the code or a unit test to demo why it doesn't ? 

[tgrip]

The code is as follows:

// Transformer.java

BeanTransformerSpi transformer = new BeanTransformer(new
DateTransformerFactory());
BeanReplicator beanReplicator = new BeanReplicator(transformer);
beanReplicator.replicateBean(inputBean, OutputBean.class);

//DateTransformerFactory.java

@Override
public CustomBeanTransformerSpi
newCustomBeanTransformer(BeanTransformerSpi arg0) {
return new DateTransformer();
}

//DateTransformer.java
@Override
public boolean isTransformable(Object from, Class<?> toClass,
PropertyInfo propInfo) {
if (from == null) {
return false;
}
boolean toClassCorrecto = toClass.isAssignableFrom(Date.class);
boolean fromCorrecto =
XMLGregorianCalendar.class.isAssignableFrom(from.getClass());
return toClassCorrecto;
}

@SuppressWarnings("unchecked")
@Override
public <T> T transform(Object from, Class<T> toClass, PropertyInfo
propInfo) {
XMLGregorianCalendar cal = (XMLGregorianCalendar) from;
return (T) cal.toGregorianCalendar().getTime();
}

Thanks
Theo

[Hanson Char]

It seems  "fromCorrecto" is computed but not used.  Can you attach actual java source files that can be compiled and executed ?

[tgrip]

Sure, I am adding the test case and all source file used.
The files can be downloaded at https://www.yousendit.com/download/ZGJjK3BDSWVRR2RjR0E9PQ
I think you can not attach files here. To make it smaller, I haven't
sent Junit 4, Log4J or beanlib jars. I am using the latest version of
bean lib, 5.0.3.beta.
I debugged the code, and I see why it does not copy it, because it
enters in JavaBeanDetailedPropertyFilter, where it checks if date is
assignable from XmlGregorianCalender. Of course it shouldn't check
this,

Thanks
Theo

[Hanson Char]

The default behavior of Beanlib is to only allow properties of "related" types to be propagated.  Yet XmlGregorianCalender is not a Date.  But you can override this.  For example, the changes below would work via configuring a "MyDetailedPropertyFilter":

public class Transformer {

public OutputBean transformToOutputBean(InputBean inputBean) {

BeanTransformerSpi transformer = new BeanTransformer(new DateTransformerFactory())

    .initDetailedPropertyFilter(new MyDetailedPropertyFilter())

;

BeanReplicator beanReplicator = new BeanReplicator(transformer);

return beanReplicator.replicateBean(inputBean, OutputBean.class);

}

}

// ==================================

// File MyDetailedPropertyFilter.java

// ==================================

import java.lang.reflect.Method;

import java.util.Date;

import javax.xml.datatype.XMLGregorianCalendar;

import net.sf.beanlib.provider.JavaBeanDetailedPropertyFilter;

public class MyDetailedPropertyFilter extends JavaBeanDetailedPropertyFilter 

{

@Override public boolean propagate(

            String propertyName, 

            Object fromBean, 

            Method readerMethod, 

            Object toBean, 

            Method setterMethod) 

{

Class<?> returnType = readerMethod.getReturnType();

Class<?> paramType = setterMethod.getParameterTypes()[0];

// allow cross types propagation from GregorianCalendar to Date via custom transformer

return XMLGregorianCalendar.class.isAssignableFrom(returnType) && Date.class.isAssignableFrom(paramType)

    || paramType.isAssignableFrom(returnType);

[Hanson Char]

>public class MyDetailedPropertyFilter extends JavaBeanDetailedPropertyFilter 

Or simply:

  public class MyDetailedPropertyFilter implements DetailedPropertyFilter 

But you get the idea.

h