MEP Functions

public class MyFunction extends AbstractFunction<Double> {

    public static final SDFDatatype[][] accTypes = new SDFDatatype[][] {{ SDFDatatype.DOUBLE },
                                                                        { SDFDatatype.DOUBLE }};

    @Override
    public String getSymbol() {
        return "myFunction";
    }

    @Override
    public Double getValue() {
        double a = this.getInputValue(0);
        double b = this.getInputValue(1);

        return a  +b;
    }
    @Override
    public SDFDatatype getReturnType() {
        return SDFDatatype.DOUBLE;
    }
    @Override
    public int getArity() {
        return 2;
    }
    @Override
    public SDFDatatype[] getAcceptedTypes(int argPos) {
        if (argPos < 0) {
            throw new IllegalArgumentException(
                    "negative argument index not allowed");
        }
        if (argPos > this.getArity()) {
            throw new IllegalArgumentException(this.getSymbol() + " has only " + this.getArity() + " arguments: Two double values.");
        }
        return accTypes[argPos];
    }
    
}