Examples of org.geotools.filter.FunctionExpression

org.geotools.filter.FunctionExpression
Quick Function implementation for direct use as a factory.
Functions are published as part of DefaultFuntionFactory using the following workflow:
- Implementation listed with Service Provider Interface org.opengis.filter.Function
- Object created using a no argument constructor (or a constructor that takes hints). {@link Factory#getImplementationHints()} used used toreview the hints that are supported by the function implementation.
- {@link #setParameters(List)} is used to supply the argument expressions.
- {@link #setFallbackValue(Literal)} is used to supply a placeholder Literal to be used if the function implementation is not available
All implements should be registered for service provider interface
```
 org.opengis.filter.Function DefaultFunctionFactor.  If you have a large number of related functions consider the use of {@link FunctionFactory}.
@author James Macgill, PSU
@author Jody Garnett (Boundless)
@see FunctionFactory
@source $URL$
```

        }
        
        Function newFunction(List<Expression> parameters, Literal fallback) throws Exception {
            // cache lookup
            if (FunctionExpression.class.isAssignableFrom(clazz)) {
                FunctionExpression function = (FunctionExpression) clazz.newInstance();
                if(parameters != null) {
                    function.setParameters(parameters);
                }
                if( fallback != null ){
                    function.setFallbackValue( fallback );
                }
                return function;
            }
            if(FunctionImpl.class.isAssignableFrom(clazz)) {
                FunctionImpl function = (FunctionImpl) clazz.newInstance();
                if(parameters != null){
                    function.setParameters( parameters );
                }
                if(fallback != null){
                    function.setFallbackValue( fallback );
                }
                return function;
            }
            //Function function = (Function) functionClass.newInstance();
            Constructor<Function> constructor = clazz.getConstructor( new Class[]{ List.class, Literal.class} );

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            Map hints) throws IOException, OperationNotSupportedException {
            if (!canEncode(element, value, hints)) {
                return;
            }


            FunctionExpression me = (FunctionExpression) value;
            AttributesImpl ai = new AttributesImpl();
            ai.addAttribute(element.getNamespace().toString(), "name", null,
                "string", me.getName());
            output.startElement(element.getNamespace(), element.getName(), ai);


            for( org.opengis.filter.expression.Expression arg : me.getParameters() ){
                elems[0].getType().encode(null, arg, output, hints);
            }
            output.endElement(element.getNamespace(), element.getName());
        }

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             {
              sortedFunctions.add(it.next()); 
             }
             
             //write them now that functions are sorted by name
             FunctionExpression exp = null;
             it = sortedFunctions.iterator();
             while (  it.hasNext()   )
             {
                 FunctionExpression fe = (FunctionExpression) it.next();
                 String funName = fe.getName();
                 int    funNArgs= fe.getArgCount();
                 
                 AttributesImpl atts = new AttributesImpl();
                 atts.addAttribute("", "nArgs", "nArgs", "", funNArgs+"");
                 
                 element(prefix +"Function_Name",funName,atts);

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Related Classes of org.geotools.filter.FunctionExpression

org.geotools.filter.function.DefaultFunctionFactory$FunctionDescriptor

org.geotools.xml.filter.FilterComplexTypes$FunctionType

org.vfny.geoserver.wfs.responses.WFSCapsTransformer$WFSCapsTranslator

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