/*
GeoGebra - Dynamic Mathematics for Everyone
http://www.geogebra.org
This file is part of GeoGebra.
This program is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation.
*/
package org.geogebra.common.kernel.advanced;
import org.geogebra.common.kernel.Construction;
import org.geogebra.common.kernel.algos.AlgoElement;
import org.geogebra.common.kernel.commands.Commands;
import org.geogebra.common.kernel.geos.GeoElement;
import org.geogebra.common.kernel.geos.GeoList;
import org.geogebra.common.kernel.geos.GeoNumberValue;
/**
* Prime factors of a number. Adapted from AlgoMode
*
* @author Michael Borcherds
*/
public class AlgoPrimeFactors extends AlgoElement {
private GeoNumberValue num; // input
private GeoList outputList; // output
private static double LARGEST_INTEGER = 9007199254740992d;
public AlgoPrimeFactors(Construction cons, String label,
GeoNumberValue num) {
super(cons);
this.num = num;
outputList = new GeoList(cons);
setInputOutput();
compute();
outputList.setLabel(label);
}
@Override
public Commands getClassName() {
return Commands.PrimeFactors;
}
@Override
protected void setInputOutput() {
input = new GeoElement[1];
input[0] = num.toGeoElement();
super.setOutputLength(1);
super.setOutput(0, outputList);
setDependencies(); // done by AlgoElement
}
public GeoList getResult() {
return outputList;
}
@Override
public final void compute() {
double n = Math.round(num.getDouble());
if (n == 1) {
outputList.clear();
outputList.setDefined(true);
return;
}
if (n < 2 || n > LARGEST_INTEGER) {
outputList.setUndefined();
return;
}
outputList.setDefined(true);
outputList.clear();
for (int i = 2; i <= n / i; i++) {
while (n % i == 0) {
outputList.addNumber(i, this);
n /= i;
}
}
if (n > 1) {
outputList.addNumber(n, this);
}
}
}