package net.fortytwo.ripple.libs.math;
import net.fortytwo.flow.Sink;
import net.fortytwo.ripple.RippleException;
import net.fortytwo.ripple.model.ModelConnection;
import net.fortytwo.ripple.model.NumericValue;
import net.fortytwo.ripple.model.PrimitiveStackMapping;
import net.fortytwo.ripple.model.RippleList;
/**
* A primitive which consumes a number and produces the largest integer value
* which is less than or equal to the number. Note: the produced value has
* a type of xsd:integer, unlike Java's Math.floor, which returns a double
* value.
*
* @author Joshua Shinavier (http://fortytwo.net)
*/
public class Floor extends PrimitiveStackMapping {
private static final String[] IDENTIFIERS = {
MathLibrary.NS_2013_03 + "floor",
MathLibrary.NS_2008_08 + "floor"};
public String[] getIdentifiers() {
return IDENTIFIERS;
}
public Floor()
throws RippleException {
super();
}
public Parameter[] getParameters() {
return new Parameter[]{
new Parameter("x", null, true)};
}
public String getComment() {
return "x => f, where f is the largest integer value that is less than or equal to x";
}
public void apply(final RippleList arg,
final Sink<RippleList> solutions,
final ModelConnection mc) throws RippleException {
RippleList stack = arg;
NumericValue a, result;
a = mc.toNumericValue(stack.getFirst());
stack = stack.getRest();
result = mc.valueOf((int) Math.floor(a.doubleValue()));
solutions.put(
stack.push(result));
}
}