On Tue, Aug 30, 2011 at 11:58 PM, Richard Eckart de Castilho
<[email protected]> wrote:
> Hi Roberto,
>
> when calling the no-args constructor of TOP, the instance is unusable. The
> JCas wrapper needs to know the CAS type and the CAS address to access the
> actual data it exposes via its getters and setters. Mind, that the JCas
> classes are no Java Beans - they are just convenience classes to access data
> hidden deep within the heaps of the low-level CAS.
>
> I suppose in your scenario, you never actually intend to use that instance
> created via the no-args constructor. It's just a dummy instance internally
> used by lambdaj to intercept the method calls to the real Tokens (those from
> the "tokens" iterable). Is this correct?
Yes, that's right.
>
> What you're doing there with lambdaj looks fascinating! We wanted to
> implement an API in uimaFIT which supports a similar style, but it couldn't
> ever have been that nice.
>
Well, we tend to use lambaj not so much, due to poor performance.
Lambdaj uses a lot of reflection..
This code is used inside a test to prepare a fake jCas
The same things could be done usign google-collection:
Iterable<Token> transform = transform(filter(select(jCas,
Token.class), new Predicate<Token>() {
@Override
public boolean apply(Token token) {
return token.getNormalForm().startsWith("#");
}
}), new Function<Token, Token>() {
@Override
public Token apply(Token token) {
token.setKind("HashTag");
token.setNormalForm(stripStart(token.getNormalForm(), "#"));
return token;
}
});
for (Token token : transform) {
// NOOP
}
Note the last for: filter and trasform are lazy! You need to "consume"
the iterable to activate predicates and functions.
I want to try to write the same this using Scala.
Cheers
RF
PS: uimafit: well done guys!
--
Roberto Franchini
L'impossibile รจ inevitabile.
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