ListCreator

/**
 *
 *  @author Szopińska Joanna S15524
 *
 */

package zad1;
import java.util.*;


public class ListCreator <T> { // Uwaga: klasa musi być sparametrtyzowana
    private List<T> list = null;
    private ListCreator(List<T> initList){
        list = initList;
    }
    public static ListCreator <T> collectFrom(List<T> initList){
        return new ListCreator(initList);
    }

    public ListCreator when (Selector sel){
        List <T> newList = new List<T>();
        for (T element : this.list){
            if (sel.select(element)){
                newList.add(element);
            }
        }
        this.list = newList;
        return this;
    }

    public List<T> mapEvery (Mapper map){
        List <T> newList = new List<T>();
        for (T element : this.list){
            element = map(element);
        }
        return this.list;
    }
}