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question asked: Mar 01 '16, 10:01 p.m.
question was seen: 2,622 times
last updated: Mar 02 '16, 3:09 a.m.

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How to de-serialize Apache wink ClientResponse response object dynamically in lyo client project

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Amit Kumar (38●4●19) | asked Mar 01 '16, 10:01 p.m.
 
Hi,

I have a oslc resource : https://server:port/rm/resources/_7UpQQ5zMEeWqXIur94EOpA.
I plan to perform GET on this URI in following way.
ClientResponse response = client.getResource(resultsUrl, OSLCConstants.CT_RDF);
Requirement req = response.getEntity(Requirement.class);

But my problem is that above mentioned resource URI can be of type Requirement or RequirementCollection. So how should I inspect response for rdf:type and based on its value,I should use either response.getEntity(Requirement.class) or response.getEntity(RequirementCollection.class);

I am new to APACHE WINK so kindly guide me on this issue.

Thanks in advance.

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Donald Nong (14.5k●6●14) | answered Mar 02 '16, 12:10 a.m.
I'm new to Lyo as well, and this is what I will do for this situation.

De-serialize using the Requirement class first (this should always work). Then check the value of "instanceShape", and do a GET to find out what it is. If it turns out to be a Requirement Collection, de-serialize for the second time using the RequirementCollection class.

The reason is that the RequirementCollection class extends the Requirement class, and "uses" is the only extra field.
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Amit Kumar commented Mar 02 '16, 12:52 a.m.

 Hi Nong,

Thanks

I get null object when I De-serialize RequirementCollection resource reponse as Requirement.

Am I missing something.

Regards



Donald Nong commented Mar 02 '16, 3:09 a.m.

It seems that my assumption was wrong. I got the same result as you did when tried with a Requirement Collection. But I think you can use the null result as an indication of a Requirement Collection, right?

P.S. I have not done debugging to see why the extra "uses" properties can cause the null result.

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