Re: [eclipselink-users] [MOXy] empty string

["polly.c.chang" <polly.c.chang@xxxxxxxxx>]

Hi Blaise,

Thanks for the quick response.  I'm glad to hear that this use case will be
easier to handle in 2.0.  Since we cannot use the nightly builds, I have
created the bug report here:
https://bugs.eclipse.org/bugs/show_bug.cgi?id=285926

Thanks!  :)

--Polly



Blaise Doughan wrote:
> 
> Hi Polly,
> 
> You have found a bug in the EclipseLink 1.1.2 release.  This has been 
> fixed in the 2.0 stream (the nightly downloads are available below).  If 
> you need this included in a patch release could you enter a bug?
> 
> http://www.eclipse.org/eclipselink/downloads/nightly.php
> 
> In EclipseLink 2.0 you will not need a converter.  You will be able to 
> set the "setNullRepresentedByEmptyNode" on the null policy to false and 
> for Strings the value will unmarshal as "" automatically.
> 
> -Blaise
> 
> polly.c.chang wrote:
>> Hi Blaise,
>>
>> I tried to do what you suggested with option #1 but am not having any
>> success (using EL 1.1.2).  My converter is not getting called.  My test
>> XML
>> has an empty element like:
>>
>> <CareOfName></CareOfName>
>>
>> After some trial and error, I created this deployment project.xml file
>> snippet:
>> 				<attribute-mapping xsi:type="xml-direct-mapping"> 
>> 					<attribute-name>careOfName</attribute-name>  
>> 					<field name="CareOfName/text()" xsi:type="node"/>  
>> 					<null-policy xsi:type="null-policy"> 
>> 						<null-representation-for-xml
>> xsi:type="marshal-null-representation">ABSENT_NODE</null-representation-for-xml>  
>> 					
>> <is-set-performed-for-absent-node>false</is-set-performed-for-absent-node> 
>> 					</null-policy> 
>> 				</attribute-mapping>  
>>
>> Usually when I unmarshal an element that has a value, the flow is that
>> UnmarshalRecord.endElement()'s second "if" statement calls into
>> XMLDirectMappingNodeValue.endElement(), which then calls the converter. 
>> But
>> when I'm unmarshalling this "CareOfName" element, the second "if" fails
>> because xpathNode.getUnmarshalNodeValue() is null.  So it never goes
>> inside
>> the "if" to call the converter.
>>
>> Is there something else that I should be setting?
>>
>> Thanks!
>>
>> --Polly
>>
>>
>>
>> Blaise Doughan wrote:
>>   
>>> Hi Polly,
>>>
>>> The relevant method is "setSetPerformedForAbsentNode(boolean)"
>>> http://www.eclipse.org/eclipselink/api/1.1/org/eclipse/persistence/oxm/mappings/nullpolicy/NullPolicy.html#setSetPerformedForAbsentNode(boolean)
>>>
>>> You will want to configure this parameter to be false.  Then EclipseLink 
>>> will not perform a set operation for missing tags.  For the "" porting 
>>> you have two options:
>>>
>>>    1. Use a converter with the mapping, if the field value is null then
>>>       return "" as the attribute value.
>>>    2. Use method accessing on the mapping (configure the mapping to use
>>>       the get/set methods instead of the attribute directly).  Then put
>>>       logic on the set method to convert null to "".  Since EclipseLink
>>>       won't perform a set for missing tags you'll know that the set to
>>>       null calls correspond only to empty tags.
>>>
>>> -Blaise
>>>
>>> polly.c.chang wrote:
>>>     
>>>> Hi,
>>>>
>>>> I have a situation where we need to distinguish between empty tags vs.
>>>> missing tags.  The rules are:
>>>>
>>>> For all String types:
>>>> * If the XML has <description></description>, that is supposed to mean
>>>> empty
>>>> string ("").
>>>> * If the XML has no "description" tag, that is supposed to mean null.
>>>> * And vice versa for marshalling.
>>>>
>>>> I looked at the javadoc and found that I might need to set a
>>>> NullPolicy:
>>>> http://www.eclipse.org/eclipselink/api/1.1/org/eclipse/persistence/oxm/mappings/nullpolicy/NullPolicy.html
>>>>
>>>> I am still confused after reading the documentation though.  How do I
>>>> tell
>>>> EclipseLink that empty string means empty tags?  
>>>>
>>>> Thanks!
>>>> --Polly
>>>>   
>>>>       
>>> _______________________________________________
>>> eclipselink-users mailing list
>>> eclipselink-users@xxxxxxxxxxx
>>> https://dev.eclipse.org/mailman/listinfo/eclipselink-users
>>>
>>>
>>>     
>>
>>   
> 
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