[Lang] excluding Fields in ReflectionToStringBuilder

[nodje <no...@gmail.com>]

Hi,

I'm using ReflectionToStringBuilder to build a default toString() for all my
Hibernate entities.
It creates problem with non initialized Fields when outside of an open
session.

Basically, I'd like to be able to exclude all entity subobjects by putting
them in ExcludeFieldNames so that they don't get accessed.

I can't see any way to do that with the actual implementation. Do you think
it's possible at all with the actual 2.4 implementation? What about 2.5.

If not, I'll certainly have to implement my own ReflectionToStringBuilder
with the ability of exluding fields that are <? extends ModelObject>. I wish
I woudn't have to use 'instanceof' but I can't see any other way.

thanks for your help.
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Re: [Lang] excluding Fields in ReflectionToStringBuilder

[nodje <no...@gmail.com>]

Here's how I solved the problem of excluding Fields that are JPA/Hibernate
entities from the ReflectionToStringBuilder:

public String toString() {

        class MyReflectionToStringBuilder extends ReflectionToStringBuilder
{

            private MyReflectionToStringBuilder(Object object, ToStringStyle
style) {
                super(object, style);
                this.setAppendTransients(false);
            }

            /**
             * Overloading of method accept() to exclude fields that are
instances of Entities,
             * and as such LazyInit exception prone.
             *
             * Check if the given field has an @Entity annotation.
             * The above should be enough in the future, but in the mean
time,
             * we check also the name of the field's super class in case
it's not already annotated with JPA @Entity
             */
            @SuppressWarnings({"SimplifiableIfStatement"})
            public boolean accept(Field field) {
                if (field.getType().isAnnotationPresent(Entity.class))
                    return false;
                Type superclass = field.getType().getGenericSuperclass();
                if (superclass != null &&
!superclass.toString().contains("ModelObject"))
                    return false;
                return super.accept(field);
            }
        }
        ;
        ReflectionToStringBuilder tsb = new
MyReflectionToStringBuilder(this, MyToStringStyle.getInstance());
        return tsb.toString();
    }

The . isAnnotationPresent() method is very convenient in case you can
identify your classes with an Annotation, otherwise, I use
getType().getGenericSuperclass().toString() to check the superclass name.


nodje wrote:
> 
> Hi,
> 
> I'm using ReflectionToStringBuilder to build a default toString() for all
> my Hibernate entities.
> It creates problem with non initialized Fields when outside of an open
> session.
> 
> Basically, I'd like to be able to exclude all entity subobjects by putting
> them in ExcludeFieldNames so that they don't get accessed.
> 
> I can't see any way to do that with the actual implementation. Do you
> think it's possible at all with the actual 2.4 implementation? What about
> 2.5.
> 
> If not, I'll certainly have to implement my own ReflectionToStringBuilder
> with the ability of exluding fields that are <? extends ModelObject>. I
> wish I woudn't have to use 'instanceof' but I can't see any other way.
> 
> thanks for your help.
> 

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