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   1 /**
   2  * Copyright (c) 2010-2023 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         int year = calendar.get(Calendar.YEAR);
  41         List<SunZodiac> zodiacs;
  42
  43         if (zodiacsByYear.containsKey(year)) {
  44             zodiacs = zodiacsByYear.get(year);
  45         } else {
  46             zodiacs = calculateZodiacs(year);
  47             zodiacsByYear.clear();
  48             zodiacsByYear.put(year, zodiacs);
  49         }
  50
  51         return zodiacs != null ? zodiacs.stream().filter(z -> z.isValid(calendar)).findFirst() : Optional.empty();
  52     }
  53
  54     /**
  55      * Calculates the zodiacs for the current year.
  56      */
  57     private List<SunZodiac> calculateZodiacs(int year) {
  58         List<SunZodiac> zodiacs = new ArrayList<>();
  59
  60         zodiacs.add(new SunZodiac(ZodiacSign.ARIES,
  61                 DateTimeUtils.getRange(year, Calendar.MARCH, 21, year, Calendar.APRIL, 19)));
  62         zodiacs.add(new SunZodiac(ZodiacSign.TAURUS,
  63                 DateTimeUtils.getRange(year, Calendar.APRIL, 20, year, Calendar.MAY, 20)));
  64         zodiacs.add(new SunZodiac(ZodiacSign.GEMINI,
  65                 DateTimeUtils.getRange(year, Calendar.MAY, 21, year, Calendar.JUNE, 20)));
  66         zodiacs.add(new SunZodiac(ZodiacSign.CANCER,
  67                 DateTimeUtils.getRange(year, Calendar.JUNE, 21, year, Calendar.JULY, 22)));
  68         zodiacs.add(new SunZodiac(ZodiacSign.LEO,
  69                 DateTimeUtils.getRange(year, Calendar.JULY, 23, year, Calendar.AUGUST, 22)));
  70         zodiacs.add(new SunZodiac(ZodiacSign.VIRGO,
  71                 DateTimeUtils.getRange(year, Calendar.AUGUST, 23, year, Calendar.SEPTEMBER, 22)));
  72         zodiacs.add(new SunZodiac(ZodiacSign.LIBRA,
  73                 DateTimeUtils.getRange(year, Calendar.SEPTEMBER, 23, year, Calendar.OCTOBER, 22)));
  74         zodiacs.add(new SunZodiac(ZodiacSign.SCORPIO,
  75                 DateTimeUtils.getRange(year, Calendar.OCTOBER, 23, year, Calendar.NOVEMBER, 21)));
  76         zodiacs.add(new SunZodiac(ZodiacSign.SAGITTARIUS,
  77                 DateTimeUtils.getRange(year, Calendar.NOVEMBER, 22, year, Calendar.DECEMBER, 21)));
  78         zodiacs.add(new SunZodiac(ZodiacSign.CAPRICORN,
  79                 DateTimeUtils.getRange(year, Calendar.DECEMBER, 22, year + 1, Calendar.JANUARY, 19)));
  80         zodiacs.add(new SunZodiac(ZodiacSign.CAPRICORN,
  81                 DateTimeUtils.getRange(year - 1, Calendar.DECEMBER, 22, year, Calendar.JANUARY, 19)));
  82         zodiacs.add(new SunZodiac(ZodiacSign.AQUARIUS,
  83                 DateTimeUtils.getRange(year, Calendar.JANUARY, 20, year, Calendar.FEBRUARY, 18)));
  84         zodiacs.add(new SunZodiac(ZodiacSign.PISCES,
  85                 DateTimeUtils.getRange(year, Calendar.FEBRUARY, 19, year, Calendar.MARCH, 20)));
  86
  87         return zodiacs;
  88     }
  89 }