/*
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.algos;
import org.geogebra.common.kernel.Construction;
import org.geogebra.common.kernel.commands.Commands;
import org.geogebra.common.kernel.geos.GeoElement;
import org.geogebra.common.kernel.geos.GeoList;
public class AlgoIntersection extends AlgoElement {
private GeoList inputList; // input
private GeoList inputList2; // input
private GeoList outputList; // output
private int size, size2;
public AlgoIntersection(Construction cons, String label, GeoList inputList,
GeoList inputList2) {
super(cons);
this.inputList = inputList;
this.inputList2 = inputList2;
outputList = new GeoList(cons);
setInputOutput();
compute();
outputList.setLabel(label);
}
@Override
public Commands getClassName() {
return Commands.Intersection;
}
@Override
protected void setInputOutput() {
// make sure that x(Element[list,1]) will work even if the output list's
// length is zero
outputList.setTypeStringForXML(inputList.getTypeStringForXML());
input = new GeoElement[2];
input[0] = inputList;
input[1] = inputList2;
super.setOutputLength(1);
super.setOutput(0, outputList);
setDependencies(); // done by AlgoElement
}
/**
* @return intersection of lists
*/
public GeoList getResult() {
return outputList;
}
@Override
public final void compute() {
size = inputList.size();
size2 = inputList2.size();
if (!inputList.isDefined() || !inputList2.isDefined()) {
outputList.setUndefined();
return;
}
outputList.setDefined(true);
outputList.clear();
for (int i = 0; i < size2; i++) {
for (int j = 0; j < size; j++) {
GeoElement geo = inputList2.get(i);
if (inputList.get(j).isEqual(geo)) {
boolean alreadyInOutputList = false;
for (int k = 0; k < outputList.size(); k++) {
if (geo.isEqual(outputList.get(k))) {
alreadyInOutputList = true;
break;
}
}
if (!alreadyInOutputList) {
outputList.add(geo.copy());
}
break;
}
}
}
}
}