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   1 /**
   2  * Copyright (c) 2010-2022 Contributors to the openHAB project
   3  *
   4  * See the NOTICE file(s) distributed with this work for additional
   5  * information.
   6  *
   7  * This program and the accompanying materials are made available under the
   8  * terms of the Eclipse Public License 2.0 which is available at
   9  * http://www.eclipse.org/legal/epl-2.0
  10  *
  11  * SPDX-License-Identifier: EPL-2.0
  12  */
  13 package org.openhab.binding.astro.internal.calc;
  14
  15 import java.util.ArrayList;
  16 import java.util.Calendar;
  17 import java.util.HashMap;
  18 import java.util.List;
  19 import java.util.Map;
  20 import java.util.Optional;
  21
  22 import org.eclipse.jdt.annotation.NonNullByDefault;
  23 import org.openhab.binding.astro.internal.model.SunZodiac;
  24 import org.openhab.binding.astro.internal.model.ZodiacSign;
  25 import org.openhab.binding.astro.internal.util.DateTimeUtils;
  26
  27 /**
  28  * Calculates the sign and range of the current zodiac.
  29  *
  30  * @author Gerhard Riegler - Initial contribution
  31  */
  32 @NonNullByDefault
  33 public class SunZodiacCalc {
  34     private Map<Integer, List<SunZodiac>> zodiacsByYear = new HashMap<>();
  35
  36     /**
  37      * Returns the zodiac for the specified calendar.
  38      */
  39     public Optional<SunZodiac> getZodiac(Calendar calendar) {
  40
  41         int year = calendar.get(Calendar.YEAR);
  42         List<SunZodiac> zodiacs;
  43
  44         if (zodiacsByYear.containsKey(year)) {
  45             zodiacs = zodiacsByYear.get(year);
  46         } else {
  47             zodiacs = calculateZodiacs(year);
  48             zodiacsByYear.clear();
  49             zodiacsByYear.put(year, zodiacs);
  50         }
  51
  52         return zodiacs != null ? zodiacs.stream().filter(z -> z.isValid(calendar)).findFirst() : Optional.empty();
  53     }
  54
  55     /**
  56      * Calculates the zodiacs for the current year.
  57      */
  58     private List<SunZodiac> calculateZodiacs(int year) {
  59         List<SunZodiac> zodiacs = new ArrayList<>();
  60
  61         zodiacs.add(new SunZodiac(ZodiacSign.ARIES,
  62                 DateTimeUtils.getRange(year, Calendar.MARCH, 21, year, Calendar.APRIL, 19)));
  63         zodiacs.add(new SunZodiac(ZodiacSign.TAURUS,
  64                 DateTimeUtils.getRange(year, Calendar.APRIL, 20, year, Calendar.MAY, 20)));
  65         zodiacs.add(new SunZodiac(ZodiacSign.GEMINI,
  66                 DateTimeUtils.getRange(year, Calendar.MAY, 21, year, Calendar.JUNE, 20)));
  67         zodiacs.add(new SunZodiac(ZodiacSign.CANCER,
  68                 DateTimeUtils.getRange(year, Calendar.JUNE, 21, year, Calendar.JULY, 22)));
  69         zodiacs.add(new SunZodiac(ZodiacSign.LEO,
  70                 DateTimeUtils.getRange(year, Calendar.JULY, 23, year, Calendar.AUGUST, 22)));
  71         zodiacs.add(new SunZodiac(ZodiacSign.VIRGO,
  72                 DateTimeUtils.getRange(year, Calendar.AUGUST, 23, year, Calendar.SEPTEMBER, 22)));
  73         zodiacs.add(new SunZodiac(ZodiacSign.LIBRA,
  74                 DateTimeUtils.getRange(year, Calendar.SEPTEMBER, 23, year, Calendar.OCTOBER, 22)));
  75         zodiacs.add(new SunZodiac(ZodiacSign.SCORPIO,
  76                 DateTimeUtils.getRange(year, Calendar.OCTOBER, 23, year, Calendar.NOVEMBER, 21)));
  77         zodiacs.add(new SunZodiac(ZodiacSign.SAGITTARIUS,
  78                 DateTimeUtils.getRange(year, Calendar.NOVEMBER, 22, year, Calendar.DECEMBER, 21)));
  79         zodiacs.add(new SunZodiac(ZodiacSign.CAPRICORN,
  80                 DateTimeUtils.getRange(year, Calendar.DECEMBER, 22, year + 1, Calendar.JANUARY, 19)));
  81         zodiacs.add(new SunZodiac(ZodiacSign.CAPRICORN,
  82                 DateTimeUtils.getRange(year - 1, Calendar.DECEMBER, 22, year, Calendar.JANUARY, 19)));
  83         zodiacs.add(new SunZodiac(ZodiacSign.AQUARIUS,
  84                 DateTimeUtils.getRange(year, Calendar.JANUARY, 20, year, Calendar.FEBRUARY, 18)));
  85         zodiacs.add(new SunZodiac(ZodiacSign.PISCES,
  86                 DateTimeUtils.getRange(year, Calendar.FEBRUARY, 19, year, Calendar.MARCH, 20)));
  87
  88         return zodiacs;
  89     }
  90 }