/** Constructor: Create a crossover operator with the given selection parent strategy */
public ArityTwo(Environment _environment, Selection _selection) {
super(_environment);
selection = _selection;
if (selection != null) {
selection.setSize(2);
}
}
/**
* Apply the operator over the given individuals
*
* @param population Source population
* @param x Individual used as first parent
* @return A collection of individuals generated by the operator
*/
public Vector apply(Population population, int x) {
Vector children = null;
if (population != null && selection != null) {
Vector parents = selection.choose(population, x);
Individual child1 = (Individual) (Cloner.clone(parents.elementAt(0)));
Individual child2 = (Individual) (Cloner.clone(parents.elementAt(1)));
// only for two children
apply(child1, child2);
children = new Vector();
children.add(child1);
children.add(child2);
}
return children;
}
public void setEnvironment(Environment _environment) {
super.setEnvironment(_environment);
selection.setEnvironment(environment);
}
