From 7f163c200f7da4a91c0d4dee325752018f821dad Mon Sep 17 00:00:00 2001
From: "David A. Madore" <david+git@madore.org>
Date: Sun, 26 Feb 2012 16:22:49 +0100
Subject: Now check day of week on entries.

---
 org/madore/damlengine/Calendar.java | 76 +++++++++++++++++++++++++++++++++++++
 1 file changed, 76 insertions(+)
 create mode 100644 org/madore/damlengine/Calendar.java

(limited to 'org/madore/damlengine/Calendar.java')

diff --git a/org/madore/damlengine/Calendar.java b/org/madore/damlengine/Calendar.java
new file mode 100644
index 0000000..d95b602
--- /dev/null
+++ b/org/madore/damlengine/Calendar.java
@@ -0,0 +1,76 @@
+package org.madore.damlengine;
+
+import java.util.Map;
+import java.util.HashMap;
+
+public final class Calendar {
+
+    public final static int monthTab[] = {
+	-59, -28, 0, 31, 61, 92, 122, 153, 184, 214, 245, 275
+    };
+
+    public static long julianDateMarch1(int year) {
+	return 1721120 + year*365 + year/4 - year/100 + year/400;
+    }
+
+    public static boolean isLeap(int year) {
+	return (year%4==0) && ((!(year%100==0))||(year%400==0));
+    }
+
+    public static long julianDate(int year, int month, int day) {
+	return julianDateMarch1(year)
+	    + monthTab[month-1]
+	    - ((month<=2 && isLeap(year))?1:0)
+	    + (day-1);
+    }
+
+    public static int dateDowNumber(int year, int month, int day) {
+	// 0 = Monday ... 6 = Sunday
+	return (int)((julianDate(year, month, day))%7);
+    }
+
+    public final static String dowNamesEn[] = {
+	"Monday", "Tuesday", "Wednesday", "Thursday",
+	"Friday", "Saturday", "Sunday"
+    };
+
+    public final static String dowNamesFr[] = {
+	"lundi", "mardi", "mercredi", "jeudi",
+	"vendredi", "samedi", "dimanche"
+    };
+
+    public final static String dowNamesDe[] = {
+	"Montag", "Dienstag", "Mittwoch", "Donnerstag",
+	"Freitag", "Samstag", "Sonntag"
+    };
+
+    public final static String dowNamesIa[] = {
+	"lunedi", "martedi", "mercuridi", "jovedi",
+	"venerdi", "saturdi", "dominica"
+    };
+
+    public final static Map<String,String[]> dowNames;
+
+    static {
+	dowNames = new HashMap<String,String[]>();
+	dowNames.put("en", dowNamesEn);
+	dowNames.put("fr", dowNamesFr);
+	dowNames.put("de", dowNamesDe);
+	dowNames.put("ia", dowNamesIa);
+    }
+
+    public static String dowName(String lang, int dowNumber) {
+	String[] dowNamesL = dowNames.get(lang);
+	if ( dowNamesL == null )
+	    return null;
+	else
+	    return dowNamesL[dowNumber];
+    }
+
+    public static String dateDowName(String lang,
+				     int year, int month, int day) {
+	int dowNumber = dateDowNumber(year, month, day);
+	return dowName(lang, dowNumber);
+    }
+
+}
-- 
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