On Fri, Jul 1, 2011 at 5:40 AM, Michael Bedward
<michael.bedw...@gmail.com> wrote:
> Meanwhile, for Sergey's problem perhaps we could add a function
> function to GeoTools: ie. a filter function that takes a user supplied
> function, implementing some simple interface, as a parameter.
The core of the problem is cloneability of that.
The code that clones functions is this:
public Object visit(Function expression, Object extraData) {
List old = expression.getParameters();
Expression[] args = new Expression[old.size()];
int i = 0;
for (Iterator iter = old.iterator(); iter.hasNext(); i++) {
Expression exp = (Expression) iter.next();
args[i]= visit(exp, extraData);
}
return getFactory(extraData).function(expression.getName(),
args);
}
public Object visit(Literal expression, Object extraData) {
return getFactory(extraData).literal(expression.getValue());
}
So let's say this delegate is stored in a literal so that it's still
a parameter of tha main function. How would the function
talk to the delegate? Passing down a array of objects?
public interface FunctionDelegate {
Object doSomething(Object... params);
}
Cheers
Andrea
--
-------------------------------------------------------
Ing. Andrea Aime
GeoSolutions S.A.S.
Tech lead
Via Poggio alle Viti 1187
55054 Massarosa (LU)
Italy
phone: +39 0584 962313
fax: +39 0584 962313
http://www.geo-solutions.it
http://geo-solutions.blogspot.com/
http://www.youtube.com/user/GeoSolutionsIT
http://www.linkedin.com/in/andreaaime
http://twitter.com/geowolf
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