Re: [tinyTiM-discuss] Mergin of Topics

[Christian H. <ha...@in...>]

Am Dienstag 03 November 2009 14:53:58 schrieb Lars Heuer:
> Hi Christian,
>
> > i tried to merge two topic maps and received an
> > IdentityConstraintException because the same identifier was added to two
> > different topics which in my opinion is correct behaviour according to
> > the TMDM.
> > So I wrote the following test program where I added the same subject
> > identifier to two different topics which should be merged by the engine.
> > The result was the same exception. Am I missing something?
>
> Thanks for your e-mail. tinyTiM does not merge topics automatically.
> That means, the IdentityConstraintException is correct. You can always
> catch is and merge topics manually:
>
> Topic topic1 =
> testMap.createTopicBySubjectIdentifier(testMap.createLocator(test_locator))
>; topic1.createName("Test1");
>
> Topic topic2 = testMap.createTopic();
> topic2.createName("Test2");
> try {
>    topic2.addSubjectIdentifier(testMap.createLocator(test_locator));
> catch (IdentityConstraintException ex) {
>    Topic existing = (Topic) ex.getExisting();
>    topic2.mergeIn(existing);
> }
>
>
> An alternative, and much better approach would be:
>
>   Topic topic1 = testMap.createTopicBySubjectIdentifier(
>                      testMap.createLocator(test_locator));
>   topic1.createName("Test1");
>
>   Topic topic2 = testMap.createTopicBySubjectIdentifier(test_locator);
>   topic2.createName("Test2");
>
>
> Here, topic2 would be equals to topic1 since the engine ensures that
> it either returns an existing topic with the provided subject
> identifier or creates a topic with that subject identifier in the
> "TopicMap.createTopicBySubjectIdentifier" method. TMAPI 2.0 supports
> also "createTopicByItemIdentifier" and "createTopicBySubjectLocator"
> with the same semantics.
>
> Best regards,
> Lars

Hi and thanks for the fast response.
The actual problem is that I try to merge two topic maps which I deserialize 
from different files, in my case an topic map schema and a topic map which I 
want to verify according to that schema. The exception is thrown in the 
mergeIn method of the topic map. I assume that the engine tries to merge two 
topics by creating a third one which gets all properties of one of those 
topics, which cases the IdentityConstraintException to be thrown.

I hope this specifies my problem more further.

Best reguards,
Christian

-- 
Christian Haß, Msc.
Abteilung Automatische Sprachverarbeitung
Institut für Informatik | Universität Leipzig
Johannisgasse 26 | Raum 00-18 | 04103 Leipzig

phone: 0049 - 341 - 97 - 32298
fax:   0049 - 341 - 97 - 32299
mail:  ha...@in...

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