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The Gwt Calendar UI
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/*
 * Copyright 2007 Future Earth, [email protected]
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */

package eu.future.earth.gwt.client.date;

import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;

public final class DateUtils {

	private DateUtils() {
		super();
	}

	public static Calendar createCalendar() {
		Calendar result = new GregorianCalendar();
		result.setFirstDayOfWeek(Calendar.MONDAY);
		result.setMinimalDaysInFirstWeek(4);
		return result;
	}
	
	public static int countDays(DateRenderer< ? > theRenderer) {
		int count = 0;
		if (theRenderer.showDay(Calendar.MONDAY)) {
			count++;
		}
		if (theRenderer.showDay(Calendar.TUESDAY)) {
			count++;
		}
		if (theRenderer.showDay(Calendar.WEDNESDAY)) {
			count++;
		}
		if (theRenderer.showDay(Calendar.THURSDAY)) {
			count++;
		}
		if (theRenderer.showDay(Calendar.FRIDAY)) {
			count++;
		}
		if (theRenderer.showDay(Calendar.SATURDAY)) {
			count++;
		}
		if (theRenderer.showDay(Calendar.SUNDAY)) {
			count++;
		}
		return count;
	}

	@SuppressWarnings("deprecation")
	public static boolean isSameDay(Date one, Date two) {
		if (one == null || two == null) {
			return false;
		}

		if (one.getYear() != two.getYear()) {
			return false;
		}
		if (one.getMonth() != two.getMonth()) {
			return false;
		}
		if (one.getDate() != two.getDate()) {
			return false;
		}
		return true;
	}

	public static boolean isSameDay(Calendar one, Calendar two) {
		if (one != null && two != null) {
			if (one.get(Calendar.YEAR) == two.get(Calendar.YEAR) && one.get(Calendar.DAY_OF_YEAR) == two.get(Calendar.DAY_OF_YEAR)) {
				return true;
			}
		}
		return false;
	}

	/**
	 * This methis checks wheter the Date are the Same or the second is the 00
	 * minute on the next day.
	 * 
	 * @param one
	 *            - The First Date
	 * @param two
	 *            - The Second date
	 * @return
	 */
	@SuppressWarnings("deprecation")
	public static boolean isSameDayOrNextDayZeroMinutes(Date one, Date two) {
		if (one == null || two == null) {
			return false;
		}

		if (one.getYear() != two.getYear()) {
			return false;
		}
		if (one.getMonth() != two.getMonth()) {
			return false;
		}
		if (one.getDate() != two.getDate()) {
			return !nextDayZeroMinutes(one, two);
		}
		return true;
	}

	/**
	 * Check if the second date is the first minute of the next day.
	 * 
	 * @param one
	 *            The first date.
	 * @param two
	 *            The second date.
	 * @return true of false
	 */
	@SuppressWarnings("deprecation")
	public static boolean nextDayZeroMinutes(Date one, Date two) {
		if (one == null || two == null) {
			return false;
		}

		if (one.getYear() != two.getYear()) {
			return false;
		}
		if (one.getMonth() != two.getMonth()) {
			return false;
		}
		if ((one.getDate() + 1) != two.getDate()) {
			return false;
		}
		if (0 != two.getHours() || 0 != two.getMinutes()) {
			return false;
		}
		return true;
	}

	/**
	 * Check if the second date is the first minute of the next day.
	 * 
	 * @param one
	 *            The first date.
	 * @param two
	 *            The second date.
	 * @return true of false
	 */
	@SuppressWarnings("deprecation")
	public static boolean zeroMinutes(Date two) {
		if (two == null) {
			return false;
		}
		if (0 == two.getHours() && 0 == two.getMinutes()) {
			return true;
		}
		return false;
	}

}