FYI: GregorianCalendar week of year checks

FYI: GregorianCalendar week of year checks

[Gary Benson]

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Hi all,

Here be dragons... on crack!

Cheers,
Gary

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Index: ChangeLog
===================================================================
RCS file: /cvs/mauve/mauve/ChangeLog,v
retrieving revision 1.2052
diff -u -r1.2052 ChangeLog
--- ChangeLog	12 Apr 2007 08:47:56 -0000	1.2052
+++ ChangeLog	12 Apr 2007 12:33:44 -0000
@@ -1,3 +1,8 @@
+2007-04-12  Gary Benson  <gbenson@redhat.com>
+
+	* gnu/testlet/java/util/GregorianCalendar/weekOfYear.java:
+	New test.
+
 2007-04-12  Gary Benson  <gbenson@redhat.com>
 
 	* gnu/testlet/java/util/GregorianCalendar/dayOfWeekInMonth.java:
Index: gnu/testlet/java/util/GregorianCalendar/weekOfYear.java
===================================================================
RCS file: gnu/testlet/java/util/GregorianCalendar/weekOfYear.java
diff -N gnu/testlet/java/util/GregorianCalendar/weekOfYear.java
--- /dev/null	1 Jan 1970 00:00:00 -0000
+++ gnu/testlet/java/util/GregorianCalendar/weekOfYear.java	12 Apr 2007 12:33:44 -0000
@@ -0,0 +1,154 @@
+// Copyright (C) 2007 Red Hat, Inc.
+// Written by Gary Benson <gbenson@redhat.com>
+
+// This file is part of Mauve.
+
+// Mauve is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation; either version 2, or (at your option)
+// any later version.
+
+// Mauve is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with Mauve; see the file COPYING.  If not, write to
+// the Free Software Foundation, 59 Temple Place - Suite 330,
+// Boston, MA 02111-1307, USA.
+
+// Tags: JDK1.1
+
+package gnu.testlet.java.util.GregorianCalendar;
+
+import java.util.Calendar;
+import java.util.GregorianCalendar;
+
+import gnu.testlet.Testlet;
+import gnu.testlet.TestHarness;
+
+public class weekOfYear implements Testlet
+{
+  public void test(TestHarness harness)
+  {
+    GregorianCalendar d = new GregorianCalendar();
+    GregorianCalendar e = new GregorianCalendar();
+
+    // Years whose first days are the specified weekdays
+    int testYears[][] =
+      {{2007, 1996, Calendar.MONDAY},
+       {2002, 2008, Calendar.TUESDAY},
+       {2003, 1992, Calendar.WEDNESDAY},
+       {1998, 2004, Calendar.THURSDAY},
+       {1999, 1988, Calendar.FRIDAY},
+       {2005, 2000, Calendar.SATURDAY},
+       {2006, 1956, Calendar.SUNDAY}};
+
+    // Months to test.  We definitely want January here,
+    // to check the calculation where January 1 falls
+    // before week 1 of the year.
+    int testMonths[] = {Calendar.JANUARY, Calendar.JULY};
+
+    int monthLengths[] = {31, 28, 31, 30, 31, 30,
+			  31, 31, 30, 31, 30, 31};
+      
+    for (int minimalDaysInFirstWeek = 1;
+	 minimalDaysInFirstWeek <= 7; minimalDaysInFirstWeek++) {
+
+      d.setMinimalDaysInFirstWeek(minimalDaysInFirstWeek);
+      e.setMinimalDaysInFirstWeek(minimalDaysInFirstWeek);
+
+      for (int firstDayOfWeek = Calendar.SUNDAY;
+	   firstDayOfWeek <= Calendar.SATURDAY; firstDayOfWeek++) {
+
+	d.setFirstDayOfWeek(firstDayOfWeek);
+	e.setFirstDayOfWeek(firstDayOfWeek);
+
+	for (int i = 0; i < testYears.length; i++) {
+	  int dayOfFirst = testYears[i][2];
+
+	  for (int leap = 0; leap <= 1; leap++) {
+	    int year  = testYears[i][leap];
+
+	    for (int j = 0; j < testMonths.length; j++) {
+	      int month = testMonths[j];
+	    
+	      for (int day = 1; day <= 31; day++) {
+
+		// First we set YEAR + MONTH + DAY_OF_MONTH and check
+		// we have DAY_OF_YEAR and WEEK_OF_YEAR correct.
+
+		GregorianCalendar c = new GregorianCalendar(year, month, day);
+		c.setMinimalDaysInFirstWeek(minimalDaysInFirstWeek);
+		c.setFirstDayOfWeek(firstDayOfWeek);
+      
+		// Which day of the year is this?
+		int dayOfYear = 0;
+		for (int k = 0; k < month; k++)
+		  dayOfYear += monthLengths[k];
+		if (month > Calendar.FEBRUARY)
+		  dayOfYear += leap;
+		dayOfYear += day;
+
+		harness.check(c.get(Calendar.DAY_OF_YEAR) == dayOfYear);
+
+		// Which day of the week is it?
+		int dayOfWeek = (dayOfFirst + dayOfYear - 2) % 7 + 1;
+		harness.check(c.get(Calendar.DAY_OF_WEEK) == dayOfWeek);
+
+		// Which day of the week is the first of the year,
+		// relative to firstDayOfWeek.
+		int relativeDayOfFirst = (7 + dayOfFirst - firstDayOfWeek) % 7;
+
+		// Which day of the year is week one, day one?
+		int dayOfYearOfWeek1Day1 = 1 - relativeDayOfFirst;
+		if ((7 - relativeDayOfFirst) < minimalDaysInFirstWeek)
+		  dayOfYearOfWeek1Day1 += 7;
+
+		// If we're before week one, day one then the week
+		// number will be with respect to the previous year.
+		// I think this is crack, but there you go.
+		int checkYear = year;
+		if (dayOfYear < dayOfYearOfWeek1Day1)
+		  {
+		    checkYear--;
+		    if (checkYear % 4 == 0)
+		      {
+			relativeDayOfFirst = (relativeDayOfFirst + 5) % 7;
+			dayOfYear += 366;
+		      }
+		    else
+		      {
+			relativeDayOfFirst = (relativeDayOfFirst + 6) % 7;
+			dayOfYear += 365;
+		      }
+
+		    dayOfYearOfWeek1Day1 = 1 - relativeDayOfFirst;
+		    if ((7 - relativeDayOfFirst) < minimalDaysInFirstWeek)
+		      dayOfYearOfWeek1Day1 += 7;
+		  }
+
+		// Which week of the year is this day in?
+		int weekOfYear = (dayOfYear - dayOfYearOfWeek1Day1 + 7) / 7;
+
+		harness.check(c.get(Calendar.WEEK_OF_YEAR) == weekOfYear);
+
+		// Then we set YEAR + DAY_OF_WEEK + WEEK_OF_YEAR and
+		// check we have MONTH and DAY_OF_MONTH correct.
+		
+		d.clear();
+		d.set(Calendar.YEAR, checkYear);
+		d.set(Calendar.DAY_OF_WEEK, dayOfWeek);
+		d.set(Calendar.WEEK_OF_YEAR, weekOfYear);
+		harness.check(d.get(Calendar.YEAR) == year);
+		harness.check(d.get(Calendar.MONTH) == month);
+		harness.check(d.get(Calendar.DAY_OF_MONTH) == day);
+	      }
+	    }
+	  }
+	}
+      }
+    }
+  }
+}