teichmann@475: package org.dive4elements.artifacts.common.utils;
ingo@389: 
ingo@389: import java.util.Calendar;
ingo@389: import java.util.Date;
ingo@389: 
ingo@389: 
ingo@389: public class DateUtils {
ingo@389: 
ingo@389:     private DateUtils() {
ingo@389:     }
ingo@389: 
ingo@389: 
ingo@389:     /**
ingo@389:      * This function extracts the year as int value from <i>date</i>.
ingo@389:      *
ingo@389:      * @param date The source date.
ingo@389:      *
ingo@389:      * @return the year as integer or -1 if date is empty.
ingo@389:      */
mschaefer@561:     public static int getYearFromDate(final Date date) {
ingo@389:         if (date == null) {
ingo@389:             return -1;
ingo@389:         }
ingo@389: 
mschaefer@561:         final Calendar cal = Calendar.getInstance();
ingo@389:         cal.setTime(date);
ingo@389: 
ingo@389:         return cal.get(Calendar.YEAR);
ingo@389:     }
mschaefer@561: 
mschaefer@561:     /**
mschaefer@561:      * Gets the abfluss year (1.11. - 31.10.) a date belongs to
mschaefer@561:      *
mschaefer@561:      * @return the abfluss year, or -1
mschaefer@561:      */
mschaefer@561:     public static int getAbflussYearFromDate(final Date date) {
mschaefer@561:         if (date == null)
mschaefer@561:             return -1;
mschaefer@561:         final Calendar cal = Calendar.getInstance();
mschaefer@561:         cal.setTime(getAbflussYear(date)[1]);
mschaefer@561:         return cal.get(Calendar.YEAR);
mschaefer@561:     }
mschaefer@561: 
mschaefer@561:     /**
mschaefer@561:      * Gets the date range of the abfluss year (1.11. - 31.10.) a date belongs to
mschaefer@561:      *
mschaefer@561:      * @return [abfluss year start date, abfluss year end date], or null
mschaefer@561:      */
mschaefer@561:     public static Date[] getAbflussYear(final Date date) {
mschaefer@561:         if (date == null)
mschaefer@561:             return null;
mschaefer@561:         final Calendar cal = Calendar.getInstance();
mschaefer@561:         cal.setTime(date);
mschaefer@561:         final int qYear = (cal.get(Calendar.MONTH) >= 10) ? cal.get(Calendar.YEAR) + 1 : cal.get(Calendar.YEAR);
mschaefer@561:         return getAbflussYear(qYear);
mschaefer@561:     }
mschaefer@561: 
mschaefer@561:     /**
mschaefer@561:      * Gets the date range of the abfluss year (1.11. - 31.10.) a date belongs to
mschaefer@561:      *
mschaefer@561:      * @return [abfluss year start date, abfluss year end date], or null
mschaefer@561:      */
mschaefer@561:     public static Date[] getAbflussYear(final int year) {
mschaefer@561:         final Calendar calStart = Calendar.getInstance();
mschaefer@561:         calStart.clear();
mschaefer@561:         calStart.set(year - 1, 10, 1, 0, 0, 0);
mschaefer@561:         final Calendar calEnd = Calendar.getInstance();
mschaefer@561:         calEnd.clear();
mschaefer@561:         calEnd.set(year, 9, 31, 23, 59, 59);
mschaefer@561:         return new Date[] { calStart.getTime(), calEnd.getTime() };
mschaefer@561:     }
mschaefer@561: 
mschaefer@561:     /**
mschaefer@561:      * Gets the date range of the abfluss year following a date, or that of the date itself if it's a nov-1
mschaefer@561:      *
mschaefer@561:      * @return [abfluss year start date, abfluss year end date], or null
mschaefer@561:      */
mschaefer@561:     public static Date[] getNextAbflussYear(final Date date) {
mschaefer@561:         if (date == null)
mschaefer@561:             return null;
mschaefer@561:         final Calendar cal = Calendar.getInstance();
mschaefer@561:         cal.setTime(date);
mschaefer@561:         final int nextQYear = cal.get(Calendar.YEAR) + 1;
mschaefer@561:         switch (cal.get(Calendar.MONTH)) {
mschaefer@561:         case 10:
mschaefer@561:             if (cal.get(Calendar.DAY_OF_MONTH) >= 2)
mschaefer@561:                 return getAbflussYear(nextQYear + 1);
mschaefer@561:             break;
mschaefer@561:         case 11:
mschaefer@561:             return getAbflussYear(nextQYear + 1);
mschaefer@561:         default:
mschaefer@561:             break;
mschaefer@561:         }
mschaefer@561:         return getAbflussYear(nextQYear);
mschaefer@561:     }
mschaefer@561: 
mschaefer@561:     /**
mschaefer@561:      * Gets the date range of the abfluss year preceeding a date, or that of the date itself if it's a oct-31
mschaefer@561:      *
mschaefer@561:      * @return [abfluss year start date, abfluss year end date], or null
mschaefer@561:      */
mschaefer@561:     public static Date[] getPreviousAbflussYear(final Date date) {
mschaefer@561:         if (date == null)
mschaefer@561:             return null;
mschaefer@561:         final Calendar cal = Calendar.getInstance();
mschaefer@561:         cal.setTime(date);
mschaefer@561:         final int previousQYear = cal.get(Calendar.YEAR);
mschaefer@561:         switch (cal.get(Calendar.MONTH)) {
mschaefer@561:         case 10:
mschaefer@561:         case 11:
mschaefer@561:             break;
mschaefer@561:         case 9:
mschaefer@561:             if (cal.get(Calendar.DAY_OF_MONTH) <= 30)
mschaefer@561:                 return getAbflussYear(previousQYear - 1);
mschaefer@561:             break;
mschaefer@561:         default:
mschaefer@561:             return getAbflussYear(previousQYear - 1);
mschaefer@561:         }
mschaefer@561:         return getAbflussYear(previousQYear);
mschaefer@561:     }
mschaefer@561: 
mschaefer@561:     /**
mschaefer@561:      * Gets the date of the new year's day following a date, or the date itself with 0-time if it's a jan-1
mschaefer@561:      *
mschaefer@561:      * @return a newyear's date, or null
mschaefer@561:      */
mschaefer@561:     public static Date getNextNewYear(final Date date) {
mschaefer@561:         if (date == null)
mschaefer@561:             return null;
mschaefer@561:         final Calendar cal = Calendar.getInstance();
mschaefer@561:         cal.setTime(date);
mschaefer@561:         final int offset = (cal.get(Calendar.DAY_OF_YEAR) == 1) ? 0 : 1;
mschaefer@561:         cal.set(cal.get(Calendar.YEAR) + offset, 0, 1, 0, 0, 0);
mschaefer@561:         return cal.getTime();
mschaefer@561:     }
ingo@389: }