Thanks Andy,
That's what I was thinking as well. However, one thing that I haven't been
able to find is how to get the type of obj that needs to be instantiated.
Currently, it is a Validity object. However, if I wanted to do this more
generically, I would want to do something like:
value = thisJoinPoint.getSignature().fieldType.newInstance()
However, I can't seem to find any way to get "fieldType".
Is that information not accessible anywhere? If not, is there a way to get
the expected return type of the get() pointcut?
Tx,
Eric
On Tue, Jul 8, 2014 at 5:26 AM, Andy Clement <andrew.clem...@gmail.com>
wrote:
> I only had a couple of mins to play but if you went with around advice you
> could make the reflection only run if initialization is required:
>
> Object *around*(): embeddedGetter() {
>
> Object value = *proceed*();
>
> *if* (value == *null*) {
>
> String fieldName = *thisJoinPoint*.getSignature().getName();
>
> Object obj = *thisJoinPoint*.getThis();
>
> *try*{
>
> Field field = obj.getClass().getDeclaredField(fieldName);
>
> field.setAccessible(*true*);
>
> field.set(obj, value = *new* Validity() );
>
> }
>
> *catch*( IllegalAccessException | NoSuchFieldException
> e){e.printStackTrace();}
>
> }
>
> *return* value;
>
> }
>
>
> Andy
>
>
> On 8 July 2014 04:34, Eric B <ebenza...@gmail.com> wrote:
>
>> I've got the following issue that I am trying to solve with AspectJ.
>>
>> Given an entity class with a null @Embedded field, when trying to access
>> it with a getter, instantiate it first if it is null.
>>
>> For example:
>>
>> @Entity
>> public class MyClass {
>>
>> @Id
>> private long id;
>>
>> @Embedded
>> private Validity validity;
>> }
>>
>>
>> And Validity:
>>
>> @Embeddable
>> public class Validity{
>> private long from;
>> private long to;
>> }
>>
>> I'm having trouble figuring out how to best write the before() advice
>> however. Ideally, I'm trying to avoid using reflection for fear of slowing
>> things down, but so far, the best I have been able to come up with is the
>> following:
>>
>> // define a pointcut for any getter method of a field with @Embedded of
>> type Validity with any name in com.ia.domain package
>> pointcut embeddedGetter() : get( @javax.persistence.Embedded
>> com.ia.domain.Validity com.ia.domain..* );
>> before() : embeddedGetter(){
>> String fieldName = thisJoinPoint.getSignature().getName();
>> Object obj = thisJoinPoint.getThis();
>> // check to see if the obj has the field already defined or is null
>> try{
>> Field field = obj.getClass().getDeclaredField(fieldName);
>> field.setAccessible(true);
>> if( field.get(obj) == null )
>> field.set(obj, new com.ia.domain.Validity() );
>> }
>> catch( IllegalAccessException | NoSuchFieldException e){}
>> }
>>
>>
>> Is there a better way?
>>
>> Thanks,
>>
>> Eric
>>
>>
>>
>>
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>
>
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