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GWT Bibliothek fuer Mobile Plattformen der SWM
/**
* SWM Services GmbH 2012.
*/
package de.swm.commons.mobile.client.widgets.date;
import com.google.gwt.i18n.client.DateTimeFormat;
import de.swm.commons.mobile.client.utils.Utils;
import java.util.Date;
/**
* Delegate for Date Calculations. E.g. handles hour, month and year overflow.
*
* @author Ch. Kutschke
* copyright (C) 2012, SWM Services GmbH
*/
public class DateCalculation {
// Date and Time constants
private static final int HOURS_PER_DAY_MINUS_ONE_HOUR = 23;
private static final int MINUTES_PER_HOUR_MINUS_ONE_SEC = 59;
private static final int LEAP_YEAR_FREQUENCE = 4;
private static final int FEBRUARY_STANDARD_YEAR = 28;
private static final int FEBRUARY_LEAP_YEAR = 29;
private static final int MONTH_WITH_30_DAYS = 30;
private static final int MONTH_WITH_31_DAYS = 31;
private static final int NO_OF_MONTHS = 12;
private static final int CENTURY_1900 = 1900;
private static final int MONTH_JANUARY = 0;
private static final int MONTH_FEBRUARY = 1;
private static final int MONTH_MARCH = 2;
private static final int MONTH_APRIL = 3;
private static final int MONTH_MAY = 4;
private static final int MONTH_JUNE = 5;
private static final int MONTH_JULY = 6;
private static final int MONTH_AUGUST = 7;
private static final int MONTH_SEPTEMBER = 8;
private static final int MONTH_OCTOBER = 9;
private static final int MONTH_NOVEMBER = 10;
private static final int MONTH_DECEMBER = 11;
/**
* Holds all months with their number of days.
*/
private final int[] month2day;
/**
* The current day.
*/
private int day = 0;
/**
* The current month.
*/
private int month = 0;
/**
* The current year.
*/
private int year = 0;
/**
* The current hour.
*/
private int hour = 0;
/**
* The current minute.
*/
private int minute = 0;
/**
* Constructor that sets a given date as internal state.
*
* @param givenDate the date to set
*/
@SuppressWarnings("deprecation")
public DateCalculation(Date givenDate) {
// unfortunately only way in GWT
day = givenDate.getDate();
month = givenDate.getMonth() + 1;
year = givenDate.getYear() + CENTURY_1900;
hour = givenDate.getHours();
minute = givenDate.getMinutes();
// initialize constants
month2day = new int[NO_OF_MONTHS];
month2day[MONTH_JANUARY] = MONTH_WITH_31_DAYS;
// leap year?
month2day[MONTH_FEBRUARY] = (year % LEAP_YEAR_FREQUENCE == 0) ? FEBRUARY_LEAP_YEAR : FEBRUARY_STANDARD_YEAR;
month2day[MONTH_MARCH] = MONTH_WITH_31_DAYS;
month2day[MONTH_APRIL] = MONTH_WITH_30_DAYS;
month2day[MONTH_MAY] = MONTH_WITH_31_DAYS;
month2day[MONTH_JUNE] = MONTH_WITH_30_DAYS;
month2day[MONTH_JULY] = MONTH_WITH_31_DAYS;
month2day[MONTH_AUGUST] = MONTH_WITH_31_DAYS;
month2day[MONTH_SEPTEMBER] = MONTH_WITH_30_DAYS;
month2day[MONTH_OCTOBER] = MONTH_WITH_31_DAYS;
month2day[MONTH_NOVEMBER] = MONTH_WITH_30_DAYS;
month2day[MONTH_DECEMBER] = MONTH_WITH_31_DAYS;
}
/**
* Formats a date according to Rfc3339 spezification
*
* @param date the date
* @return the Rfc3339 string
*/
public String formatToRfc3339Timestamp(Date date, boolean isLocalTime) {
DateStyle defaultDateStyle = DateStyle.DATETIME;
final DateTimeFormat format = (isLocalTime) ?
DateTimeFormat.getFormat(defaultDateStyle.getFormatPatternRfc3339Local())
: DateTimeFormat.getFormat(defaultDateStyle.getFormatPatternRfc3339());
return format.format(date);
}
/**
* Formats a date according to Rfc3339 spezification
*
* @param date the date
* @return the Rfc3339 string
*/
public String formatToRfc3339(Date date, DateStyle dateStyle, boolean isLocalTime) {
if (date == null) {
return "";
}
final DateTimeFormat format = (isLocalTime) ? DateTimeFormat.getFormat(dateStyle.getFormatPatternRfc3339Local())
: DateTimeFormat.getFormat(dateStyle.getFormatPatternRfc3339());
return format.format(date);
}
/**
* Will pase a String in Rfc3339 spcification to an Date as timestamp.
*
* @param pattern the patternD
* @return the date
*/
public Date parseRfc3339Timestamp(final String pattern, boolean isLocalTime) {
if (pattern == null) {
return null;
}
try {
DateStyle defaultDateStyle = DateStyle.DATETIME;
String dateString = this.prepareDateString(pattern, defaultDateStyle);
DateTimeFormat format = (isLocalTime) ?
DateTimeFormat.getFormat(defaultDateStyle.getFormatPatternRfc3339Local())
: DateTimeFormat.getFormat(defaultDateStyle.getFormatPatternRfc3339());
return format.parse(dateString);
} catch (IllegalArgumentException ex) {
return null;
}
}
/**
* Will pase a String in Rfc3339 spcification to an Date according teh DateStyle.
*
* @param pattern the pattern
* @return the date
*/
public Date parseRfc3339(String pattern, DateStyle dateStyle, boolean isLocalTime) {
if (pattern == null) {
return null;
}
try {
String dateString = this.prepareDateString(pattern, dateStyle);
final DateTimeFormat format = (isLocalTime) ? DateTimeFormat.getFormat(dateStyle.getParsePatternRfc3339Local())
: DateTimeFormat.getFormat(dateStyle.getParsePatternRfc3339());
return format.parse(dateString);
} catch (IllegalArgumentException ex) {
return null;
}
}
/**
* Convert internal state to a Date.
*
* @return the state as Date
*/
@SuppressWarnings("deprecation")
public Date getDate() {
return new Date(year - CENTURY_1900, month - 1, day, hour, minute);
}
/**
* Sets manually the day.
*
* @param day the day
*/
public void setDay(String day) {
if (day != null) {
try {
this.day = Integer.valueOf(day);
decrementDay();
incrementDay();
} catch (NumberFormatException ex) {
Utils.console("Wrong number format " + day);
}
}
}
/**
* Sets manually the day.
*
* @param month the month
*/
public void setMonth(String month) {
if (month != null) {
try {
this.month = Integer.valueOf(month);
decrementMonth();
incrementMonth();
} catch (NumberFormatException ex) {
Utils.console("Wrong number format " + month);
}
}
}
/**
* Sets manually the day.
*
* @param year the year
*/
public void setYear(String year) {
if (year != null) {
try {
this.year = Integer.valueOf(year);
decrementYear();
incrementYear();
} catch (NumberFormatException ex) {
Utils.console("Wrong number format " + year);
}
}
}
/**
* Sets manually the day.
*
* @param hour the hour
*/
public void setHour(String hour) {
if (hour != null) {
try {
this.hour = Integer.valueOf(hour);
decrementHour();
incrementHour();
} catch (NumberFormatException ex) {
Utils.console("Wrong number format " + hour);
}
}
}
/**
* Sets manually the day.
*
* @param minute the minute
*/
public void setMinute(String minute) {
if (minute != null) {
try {
this.minute = Integer.valueOf(minute);
decrementMinute();
incrementMinute();
} catch (NumberFormatException ex) {
Utils.console("Wrong number format " + minute);
}
}
}
/**
* Increments a day. Handles overflow.
*/
public void incrementDay() {
int newDay = day + 1;
if (newDay > month2day[month - 1]) {
day = 1;
incrementMonth();
} else {
day = newDay;
}
}
/**
* Decrements a day. Handles overflow.
*/
public void decrementDay() {
int newDay = day - 1;
if (newDay < 1) {
if (month > MONTH_FEBRUARY) {
day = month2day[month - 2];
} else {
day = month2day[MONTH_DECEMBER];
}
decrementMonth();
} else {
day = newDay;
}
}
/**
* Increments a month. Handles overflow.
*/
public void incrementMonth() {
int newMonth = month + 1;
if (newMonth > MONTH_DECEMBER + 1) {
month = 1;
incrementYear();
} else {
month = newMonth;
}
adjustDaysInMonth();
}
/**
* Decrements a month. Handles overflow.
*/
public void decrementMonth() {
int newMonth = month - 1;
if (newMonth < 1) {
month = MONTH_DECEMBER + 1;
decrementYear();
} else {
month = newMonth;
}
adjustDaysInMonth();
}
/**
* Adjust days in a months.
*/
public void adjustDaysInMonth() {
int fixedDay = Math.min(month2day[month - 1], day);
if (fixedDay != day) {
day = fixedDay;
}
}
/**
* Increments a year. Handles leap years.
*/
public void incrementYear() {
year++;
adjustLeapYear();
}
/**
* Decrements a year. Handles leap years.
*/
public void decrementYear() {
year--;
adjustLeapYear();
}
/**
* Adjusts a leap year. Handles overflow.
*/
private void adjustLeapYear() {
int daysInFebruary = (year % LEAP_YEAR_FREQUENCE == 0) ? FEBRUARY_LEAP_YEAR : FEBRUARY_STANDARD_YEAR;
month2day[1] = daysInFebruary;
if (month == 1) {
adjustDaysInMonth();
}
}
/**
* Increments a minute. Handles overflow.
*/
public void incrementMinute() {
int newMinute = minute + 1;
if (newMinute > MINUTES_PER_HOUR_MINUS_ONE_SEC) {
minute = 0;
incrementHour();
} else {
minute = newMinute;
}
}
/**
* Decrements a minute. Handles overflow.
*/
public void decrementMinute() {
int newMinute = minute - 1;
if (newMinute < 0) {
minute = MINUTES_PER_HOUR_MINUS_ONE_SEC;
decrementHour();
} else {
minute = newMinute;
}
}
/**
* Increments a hour. Handles overflow.
*/
public void incrementHour() {
int newHour = hour + 1;
if (newHour > HOURS_PER_DAY_MINUS_ONE_HOUR) {
hour = 0;
incrementDay();
} else {
hour = newHour;
}
}
/**
* Decrements a hour. Handles overflow.
*/
public void decrementHour() {
int newHour = hour - 1;
if (newHour < 0) {
hour = HOURS_PER_DAY_MINUS_ONE_HOUR;
decrementDay();
} else {
hour = newHour;
}
}
/**
* Gibt day zurück.
*
* @return day
*/
public String getDay() {
return String.valueOf(day);
}
/**
* Gibt month zurück.
*
* @return month
*/
public String getMonth() {
return String.valueOf(month);
}
/**
* Gibt year zurück.
*
* @return year
*/
public String getYear() {
return String.valueOf(year);
}
/**
* Gibt hour zurück.
*
* @return hour
*/
public int getHour() {
return hour;
}
/**
* Gibt minute zurück.
*
* @return minute
*/
public int getMinute() {
return minute;
}
/**
* Prepares the Date String for prsing.
*
* @param originDataString origin date string
* @return prepared date string
* @see DateStyle
*/
private String prepareDateString(final String originDataString, final DateStyle dateStyle) {
String dateString = null;
if (DateStyle.DATETIME.equals(dateStyle) && originDataString.indexOf('.') < 0) {
// miss milliseconds
dateString = originDataString + ".00";
} else if (DateStyle.TIME.equals(dateStyle) && originDataString.indexOf(".") < 0) {
// miss seconds and milliseconds
dateString = originDataString + ":00.00";
} else {
dateString = originDataString;
}
return dateString;
}
}
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