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From: Aleksandar Dimitrov <aleks.dimitrov@gmail.com>
Date: Mon, 26 Jan 2015 00:36:00 +0100
To: user@uima.apache.org
Subject: Re: Using OpenNLP type annotations with UIMAfit
Message-ID: <20150125233559.GA9038@minsk>
References: <20150125215945.GB28930@minsk>
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Hi,

Thanks for taking the time to answer! Your mail helped lift quite some
confusions I had.

> No, it is not generated at runtime. It is generated manually or at build-=
time,
> e.g. using the maven-jcasgen-plugin.

Right, I was wondering when that happened, and just thought it would be
run-time, since I never saw the familiar <typeName>.java and
<typeName>_Type.java files anywhere.

> OpenNLP aims to be configurable with regards to types. So you must have *=
some*
> type system that you configure OpenNLP to use, right?

Yes, the OpenNLP type system that ships with the OpenNlp source. Though I t=
hink
after our discussion, I might just switch over to my own type system (most =
of
which will be a verbatim copy.)

> Open it in the Eclipse
> UIMA Type-System Editor and hit the "JCasGen" button - it will generate t=
he
> JCas classes that you can use with uimaFIT JCasUtil.

I'm not using Eclipse, but I believe that maven-jcasgen-plugin would help me
here.

> typeSystemInit() is meant for CAS-based analysis engines, not for JCas-ba=
sed annotators.=20

Oh, that's interesting! I was confused, because its an overridable method f=
or
JCasAnnotator.

> You need the CAS-based API only if you want to configure your components =
at
> runtime with regards to the annotation types they should use.

So that's the way OpenNLP does it?

> If you can stick to a specific type system, use the JCas-based analysis
> engines.

I can, and I think I shall.

> The CAS-API is not type-safe. Neither is the UIMA-JCas API, but the uimaF=
IT JCas-API is ;)

Rigt, so I usually dislike having to have the JCas-Gen-generated files lying
around (no real reason, except that it adds another step to the source setup
and compilation process, and I'm not using Eclipse) but I *very* much enjoy
uimaFIT's type safety in AnalysisEngines, so I think I'll bite the bullet.

> You could alternatively use an alternative OpenNLP binding for UIMA, e.g.=
 the
> one provided by DKPro Core [1] (not an Apache project, but one I'm workin=
g on
> too).

I've been looking at and reading the DKPro code extensively. It's nice and =
easy
to read, and has helped me along with finding solutions to some problems
(I've been using it mostly as example code for an uimaFIT setup!)
Just this one I couldn't figure out :-) And sometimes I chose different ave=
nues,
for example I ended up using a URLStreamHandlerFactory instead of dkpro's
ResourceUtils.resolveLocation() to load my resource files from within JARs =
(or
indeed any other location.)

Cheers,
Aleks

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