First draft month views

src/main/java/de/kreth/vaadin/clubhelper/vaadinclubhelper/ui/components/calendar/WeeksOfMonth.java

@@ -0,0 +1,74 @@
+package de.kreth.vaadin.clubhelper.vaadinclubhelper.ui.components.calendar;
+
+import java.time.DayOfWeek;
+import java.time.LocalDate;
+import java.time.Month;
+import java.time.YearMonth;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+public class WeeksOfMonth {
+
+	private static final List<DayOfWeek> ORDERED_WEEKDAY = Arrays.asList(DayOfWeek.MONDAY, DayOfWeek.TUESDAY, DayOfWeek.WEDNESDAY, DayOfWeek.THURSDAY, DayOfWeek.FRIDAY, DayOfWeek.SATURDAY, DayOfWeek.SUNDAY);
+	private final YearMonth yearMonth;
+	private final List<Map<DayOfWeek, Integer>> weeks;
+
+	public WeeksOfMonth(Month month, int year) {
+		this(YearMonth.of(year, month));
+	}
+
+	public WeeksOfMonth(YearMonth month) {
+		this.yearMonth = month;
+		weeks = Collections.unmodifiableList(createWeeks());
+	}
+
+	private List<Map<DayOfWeek, Integer>> createWeeks() {
+		LocalDate day = yearMonth.atDay(1);
+
+		List<Map<DayOfWeek, Integer>> result = new ArrayList<>();
+		Map<DayOfWeek, Integer> currentWeek = new HashMap<>();
+		
+		int monthValue = yearMonth.getMonthValue();
+		while (day.getMonthValue() == monthValue) {
+
+			for (DayOfWeek d: ORDERED_WEEKDAY) {
+				if (d.equals(day.getDayOfWeek()) && day.getMonthValue() == monthValue) {
+					currentWeek.put(d, day.getDayOfMonth());
+					day = day.plusDays(1);
+				} else {
+					currentWeek.put(d, null);
+				}				
+			}
+			result.add(Collections.unmodifiableMap(currentWeek));
+			currentWeek = new HashMap<>();
+		}
+		return result;
+	}
+
+	public int dayCount() {
+		return yearMonth.lengthOfMonth();
+	}
+
+	/**
+	 * Week in Month >=0 && < {@link #weekCount()} depending on day count and weekday order.
+	 * @param index
+	 * @return
+	 */
+	public Map<DayOfWeek, Integer> getWeek(int index) {
+		return weeks.get(index);
+	}
+
+	/**
+	 * Count of week (parts) in this month.
+	 * @return
+	 */
+	public int weekCount() {
+		return weeks.size();
+	}
+	
+	
+}

src/main/java/de/kreth/vaadin/clubhelper/vaadinclubhelper/ui/components/calendar/Year.java

@@ -4,16 +4,15 @@ import java.time.DayOfWeek;
 import java.time.LocalDate;
 import java.time.Month;
 import java.time.format.TextStyle;
-import java.util.Arrays;
-import java.util.LinkedList;
-import java.util.List;
+import java.util.HashMap;
 import java.util.Locale;
-import java.util.Queue;
+import java.util.Map;
 
 public class Year {
 
 	private final LocalDate date;
 	private final Locale locale;
+	private final Map<Month, WeeksOfMonth> monthWeeks;
 
 	public Year(int year) {
 		this(year, Locale.getDefault());
@@ -25,6 +24,10 @@ public class Year {
 		}
 		this.date = LocalDate.of(year, 1, 1);
 		this.locale = locale;
+		this.monthWeeks = new HashMap<>();
+		for (Month m: Month.values()) {
+			monthWeeks.put(m, new WeeksOfMonth(m, year));
+		}
 	}
 	
 	public int getYear() {
@@ -35,26 +38,18 @@ public class Year {
 		return month.getDisplayName(TextStyle.FULL_STANDALONE, locale);
 	}
 	
-	List<Integer> days = Arrays.asList(null, null, 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,28,30,31,32);
-	Queue<Integer> queue = new LinkedList<>(days);
-	
 	/**
 	 * Day of month, numeric for the specified by parameters.
 	 * @param month	month of the day
-	 * @param week	1-5th week of the month
+	 * @param week	1-6th week of the month
 	 * @param dayOfWeek	weekday of the week in the month.
 	 * @return	numeric value of the day of the month.
 	 */
 	public String getDay(Month month, short week, DayOfWeek dayOfWeek) {
-		if (queue.isEmpty()) {
-			queue.addAll(days);
-		}
-		Integer poll = queue.poll();
-		if (poll != null) {
-			return poll.toString();
-		} else {
-			return "";
-		}
+		Integer res = monthWeeks.get(month).getWeek(week - 1).get(dayOfWeek);
+		
+		return res == null ?  "" : res.toString();
+				
 	}
 	
 }

src/test/java/de/kreth/vaadin/clubhelper/vaadinclubhelper/ui/components/calendar/WeeksOfMonthTest.java

@@ -0,0 +1,54 @@
+package de.kreth.vaadin.clubhelper.vaadinclubhelper.ui.components.calendar;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertNull;
+
+import java.time.DayOfWeek;
+import java.time.Month;
+import java.util.Map;
+
+import org.junit.jupiter.api.Test;
+
+class WeeksOfMonthTest {
+
+	@Test
+	void test2018November() {
+		WeeksOfMonth november = new WeeksOfMonth(Month.NOVEMBER, 2018);
+		assertNotNull(november);
+		assertEquals(30, november.dayCount());
+		assertEquals(5, november.weekCount());
+		Map<DayOfWeek, Integer> week = november.getWeek(0);
+		assertNotNull(week);
+		assertEquals(7, week.size());
+		assertNull(week.get(DayOfWeek.MONDAY));
+		assertNull(week.get(DayOfWeek.TUESDAY));
+		assertNull(week.get(DayOfWeek.WEDNESDAY));
+		assertEquals(1, week.get(DayOfWeek.THURSDAY).intValue());
+		assertEquals(2, week.get(DayOfWeek.FRIDAY).intValue());
+		assertEquals(4, week.get(DayOfWeek.SUNDAY).intValue());
+		
+		week = november.getWeek(4);
+		assertEquals(26, week.get(DayOfWeek.MONDAY).intValue());
+		assertEquals(27, week.get(DayOfWeek.TUESDAY).intValue());
+		assertEquals(28, week.get(DayOfWeek.WEDNESDAY).intValue());
+		assertEquals(29, week.get(DayOfWeek.THURSDAY).intValue());
+		assertEquals(30, week.get(DayOfWeek.FRIDAY).intValue());
+		assertNull(week.get(DayOfWeek.SATURDAY));
+		assertNull(week.get(DayOfWeek.SUNDAY));
+	}
+
+	@Test
+	void testLastDayOfMonthIsMonday() {
+		WeeksOfMonth april = new WeeksOfMonth(Month.APRIL, 2018);
+		assertEquals(6, april.weekCount());
+
+		Map<DayOfWeek, Integer> week = april.getWeek(0);
+		assertNull(week.get(DayOfWeek.SATURDAY));
+		assertEquals(1, week.get(DayOfWeek.SUNDAY).intValue());
+		week = april.getWeek(5);
+		assertEquals(30, week.get(DayOfWeek.MONDAY).intValue());
+		assertNull(week.get(DayOfWeek.TUESDAY));
+		
+	}
+}