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Java > Open Source Codes > demo > townsend > service > DataKeeper


1 /*
2 @COPYRIGHT@
3 */
4 package demo.townsend.service;
5
6 import java.util.ArrayList JavaDoc;
7 import java.util.Iterator JavaDoc;
8
9 /**
10  * DataKeeper keeps track of the current state of the user's list. All
11  * modifications to the user's list are made by calling DataKeeper's methods.
12  */
13 public class DataKeeper {
14     
15     private final int MAX_NUM = 5;
16     private ArrayList JavaDoc userList;
17     
18     public DataKeeper() {
19       userList = new ArrayList JavaDoc();
20     }
21     
22     public void addListItem(Product newProd) {
23       for (Iterator JavaDoc iter = userList.iterator(); iter.hasNext();) {
24         if (((Product)iter.next()).getId().equals(newProd.getId())) {
25           iter.remove();
26         }
27       }
28       
29       userList.add(0, newProd);
30       
31       if (userList.size() > MAX_NUM) {
32         userList.remove(MAX_NUM);
33       }
34     }
35     
36     public int getListSize() {
37       return userList.size();
38     }
39     
40     public ArrayList JavaDoc getList() {
41       return userList;
42     }
43     
44     public Product getCurrent() {
45       if (getListSize() > 0)
46         return (Product)userList.get(0);
47       
48       return null;
49     }
50  
51 }
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