exo2/ListExtension.java

   1 import java.util.List;
   2 import java.util.ListIterator;
   3 import java.util.AbstractList;
   4
   5 public class ListExtension<E> extends AbstractList<E> {
   6     private List<E> list;
   7
   8     public ListExtension() {
   9         setList(null);
  10     }
  11
  12     public ListExtension(List<E> l) {
  13         setList(l);
  14     }
  15
  16     /**
  17      * [setList description]
  18      * @param l [description]
  19      */
  20     public void setList(List<E> l) {
  21         list = l;
  22     }
  23
  24     /**
  25      * [getList description]
  26      * @return [description]
  27      */
  28     public List<E> getList() {
  29         return list;
  30     }
  31
  32     /**
  33      * [get description]
  34      * @param  index [description]
  35      * @return       [description]
  36      */
  37     public E get(int index) {
  38         return list.get(index);
  39     }
  40
  41     /**
  42      * [size description]
  43      * @return [description]
  44      */
  45     public int size() {
  46         return list.size();
  47     }
  48
  49     public boolean add(E e) {
  50         return list.add(e);
  51     }
  52
  53     /**
  54      * Should mimic the List<E> add(int index, E value) method
  55      * @param index [description]
  56      * @param value [description]
  57      * @return      [description]
  58      */
  59     public void add(int index, E value) {
  60         ListIterator<E> iter = list.listIterator();
  61         int i = 0;
  62         // go to the element at index + 1
  63         while (iter.hasNext() && i <= index) {
  64             iter.next();
  65             i++;
  66         }
  67         iter.add(value);
  68     }
  69
  70     //FIXME: replace parameter by the list of objects to add
  71     public void addNelements(int index, int Nelements) {
  72         ListIterator<E> iter = list.listIterator();
  73         int i = 0;
  74         // go to the element at index + 1
  75         while (iter.hasNext() && i <= index) {
  76             iter.next();
  77             i++;
  78         }
  79         for (int j = 0; j < Nelements; j++) {
  80             iter.add((E)new Object());
  81         }
  82     }
  83
  84 }