CustomDouble.java

package functions.custom;

import java.util.Set;

import ca.uqac.lif.cep.Context;
import ca.uqac.lif.cep.EventTracker;
import ca.uqac.lif.cep.functions.Function;

public class CustomDouble extends Function
{
    @Override
    public void evaluate(Object[] inputs, Object[] outputs, Context c, EventTracker t)
    {
        Number n = (Number) inputs[0];
        outputs[0] = n.floatValue() * 2;
    }

    //!
    @Override
    public int getInputArity()
    {
        return 1;
    }

    @Override
    public int getOutputArity() 
    {
        return 1;
    }
    
    @Override
    public Function duplicate(boolean with_state) 
    {
        return new CustomDouble();
    }
    //!

    @Override
    public void getInputTypesFor(Set<Class<?>> s, int i) 
    {
        if (i == 0)
            s.add(Number.class);
    }

    @Override
    public Class<?> getOutputTypeFor(int i) 
    {
        if (i == 0)
            return Number.class;
        return null;
    }

}