Examples of org.geotools.filter.FunctionFactory

org.geotools.filter.FunctionFactory

Factory interface for filter functions.

The factory provides a list of {#link FunctionName} describing the available functions. Each FunctionName provides details of the name, expected arguments and return type.

Individual functions can be created using a name from this list, along with the required number of arguments and a fallback value.

Prior to GeoTools 2.7 functions were made available as individual factories using {@link FunctionExpression}. @author Justin Deoliveira (Boundless) @since 2.7 @see Function @source $URL$

            
            public <T> Iterator<T> iterator(Class<T> category) {
                
                if (FunctionFactory.class == category) {
                     List<FunctionFactory> l = new ArrayList<FunctionFactory>();
                     l.add(new FunctionFactory( ) {
                        
                        @SuppressWarnings("unchecked")
                        public List<FunctionName> getFunctionNames() {
                            return (List) Arrays.asList(new FunctionNameImpl("foo", 
                                new String[]{"bar", "baz"}));

    }
    
    @Test
    public void testLookup() {
        Set<FunctionFactory> factories = CommonFactoryFinder.getFunctionFactories(null);
        FunctionFactory factory = null;
        
        for (FunctionFactory ff : factories) {
            for (FunctionName fn : ff.getFunctionNames()) {
                if ("foo".equals(fn.getName())) {
                    factory = ff;
                    break;
                }
            }
        }
        
        assertNotNull(factory);
        Function f = factory.function("foo", null, null);
        assertNotNull(f);
    }

Examples of org.geotools.filter.FunctionFactory

Related Classes of org.geotools.filter.FunctionFactory