Hi All,
Solution offered by Michael worked flawlessly for geotools.2.6.3.
However, for geotools 2.7.0, when such filter:
org.opengis.filter.Filter filter = ff2.equals(foo, ff2.literal(true));
passed to MapLayer in Style in Rule (mixed with some other filters using
filterFactory.and())
this gives the following error:
java.lang.RuntimeException: Unable to find function foo
at
org.geotools.filter.FunctionFinder.findFunction(FunctionFinder.java:103)
Any ideas?
Thanks,
Sergey
On 21.05.2010 6:32, Michael Bedward wrote:
> Hi again Sergey,
>
> If you are only going to be using your filter programmatically (rather
> than in SLD files) you can cheat a bit and set the string that you are
> looking for in the filter function constructor like this...
>
> public class Foo extends FunctionExpressionImpl {
> private final String typeName;
>
> public Foo(String typeName) {
> super("foo");
> this.typeName = typeName;
> }
>
> @Override
> public int getArgCount() {
> return 0;
> }
>
> @Override
> public Object evaluate(Object feature) {
> return
> (((SimpleFeature)feature).getID().matches(String.format("%s\\.\\d+",
> typeName)));
> }
> }
>
> Then you can use it to create a Filter like this...
>
> FilterFactory2 ff2 = CommonFactoryFinder.getFilterFactory2(null);
> org.opengis.filter.expression.Function foo = new Foo("some_name");
> org.opengis.filter.Filter filter = ff2.equals(foo,
> ff2.literal(true));
>
> Michael
>
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