1 package org.paneris.jammyjoes.mvp;
2
3 import java.text.SimpleDateFormat;
4 import java.util.Calendar;
5 import java.util.Date;
6 import java.util.GregorianCalendar;
7
8 public class MonthAdaptor implements EquatableComparable {
9
10 private Date _date;
11 private static SimpleDateFormat formatter = new SimpleDateFormat("MM/yyyy");
12
13
14 public EquatableComparable earliest() {
15 Calendar calendar = asCalendar();
16 calendar.add(Calendar.YEAR, -1);
17 return new MonthAdaptor(calendar.getTime());
18 }
19
20 public EquatableComparable previous() {
21 Calendar calendar = new GregorianCalendar(_date.getYear()+1900,_date.getMonth(), _date.getDate());
22 calendar.add(Calendar.MONTH, -1);
23 return new MonthAdaptor(calendar.getTime());
24 }
25
26 private Calendar asCalendar() {
27 return new GregorianCalendar(_date.getYear()+1900,_date.getMonth(), _date.getDate());
28 }
29
30 public String toString() {
31 if (_date == null) return "";
32 return formatter.format(_date);
33 }
34
35 public int hashCode() {
36 if (_date == null) {
37 return 0;
38 }
39 return _date.getYear() ^ _date.getMonth();
40 }
41
42 public MonthAdaptor(Date date) {
43 _date = date;
44 }
45
46 public boolean isNull() {
47 return _date == null;
48 }
49
50 public boolean equals(Object other) {
51 if (other == null) return false;
52 if (_date == null) return false;
53 if (!(other instanceof EquatableComparable))
54 return false;
55 MonthAdaptor otherDate = (MonthAdaptor) other;
56 if (otherDate._date == null) return false;
57 if (_date.getYear() == otherDate._date.getYear()
58 && _date.getMonth() == otherDate._date.getMonth()) {
59 return true;
60 }
61 return false;
62 }
63
64 public int compareTo(Object other) {
65 if (other == null) return 1;
66 if (_date == null) return -1;
67 if (!(other instanceof EquatableComparable))
68 return 1;
69 MonthAdaptor otherDate = (MonthAdaptor) other;
70 if (otherDate._date == null) return 1;
71 if (_date.getYear() > otherDate._date.getYear()) return 1;
72 if (_date.getYear() < otherDate._date.getYear()) return -1;
73 if (_date.getMonth() > otherDate._date.getMonth()) return 1;
74 if (_date.getMonth() < otherDate._date.getMonth()) return -1;
75 return 0;
76 }
77
78 }