import java.util.ArrayList;
import java.util.List;
import java.util.function.Function;
import java.util.function.Predicate;

public class ListCreator<T> {

	private List<T> list;
	private List<T> listTmp;

	public ListCreator(List<T> list) {
		this.list = list;
	}

	public static <T> ListCreator<T> collectFrom(List<T> destinations) {
		ListCreator<T> lc = new ListCreator<T>(destinations);
		return lc;
	}

	public ListCreator<T> when(Predicate<T> p) {
		listTmp = new ArrayList<T>();

		for(int i = 0; i < list.size(); i++) {
			if(p.test(list.get(i))) {
				listTmp.add(list.get(i));
			}
        }
		this.list = listTmp;
		return this;
	}

	public <R> List<T> mapEvery(Function<T,R> u) {
		listTmp = new ArrayList<T>();

		for (T e : list) {
			listTmp.add( (T) u.apply(e));
        }

		this.list = listTmp;
		return list;
	}

}