Source Code Cross Referenced for CopticChronology.java in  » Development » Joda-Time » org » joda » time » chrono » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Development » Joda Time » org.joda.time.chrono 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         *  Copyright 2001-2005 Stephen Colebourne
003:         *
004:         *  Licensed under the Apache License, Version 2.0 (the "License");
005:         *  you may not use this file except in compliance with the License.
006:         *  You may obtain a copy of the License at
007:         *
008:         *      http://www.apache.org/licenses/LICENSE-2.0
009:         *
010:         *  Unless required by applicable law or agreed to in writing, software
011:         *  distributed under the License is distributed on an "AS IS" BASIS,
012:         *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013:         *  See the License for the specific language governing permissions and
014:         *  limitations under the License.
015:         */
016:        package org.joda.time.chrono;
017:
018:        import java.util.HashMap;
019:        import java.util.Map;
020:
021:        import org.joda.time.Chronology;
022:        import org.joda.time.DateTime;
023:        import org.joda.time.DateTimeConstants;
024:        import org.joda.time.DateTimeField;
025:        import org.joda.time.DateTimeZone;
026:        import org.joda.time.field.SkipDateTimeField;
027:
028:        /**
029:         * Implements the Coptic calendar system, which defines every fourth year as
030:         * leap, much like the Julian calendar. The year is broken down into 12 months,
031:         * each 30 days in length. An extra period at the end of the year is either 5
032:         * or 6 days in length. In this implementation, it is considered a 13th month.
033:         * <p>
034:         * Year 1 in the Coptic calendar began on August 29, 284 CE (Julian), thus
035:         * Coptic years do not begin at the same time as Julian years. This chronology
036:         * is not proleptic, as it does not allow dates before the first Coptic year.
037:         * <p>
038:         * This implementation defines a day as midnight to midnight exactly as per
039:         * the ISO chronology. Some references indicate that a coptic day starts at
040:         * sunset on the previous ISO day, but this has not been confirmed and is not
041:         * implemented.
042:         * <p>
043:         * CopticChronology is thread-safe and immutable.
044:         *
045:         * @see <a href="http://en.wikipedia.org/wiki/Coptic_calendar">Wikipedia</a>
046:         * @see JulianChronology
047:         *
048:         * @author Brian S O'Neill
049:         * @since 1.0
050:         */
051:        public final class CopticChronology extends BasicFixedMonthChronology {
052:
053:            /** Serialization lock */
054:            private static final long serialVersionUID = -5972804258688333942L;
055:
056:            /**
057:             * Constant value for 'Anno Martyrum' or 'Era of the Martyrs', equivalent
058:             * to the value returned for AD/CE.
059:             */
060:            public static final int AM = DateTimeConstants.CE;
061:
062:            /** A singleton era field. */
063:            private static final DateTimeField ERA_FIELD = new BasicSingleEraDateTimeField(
064:                    "AM");
065:
066:            /** The lowest year that can be fully supported. */
067:            private static final int MIN_YEAR = -292269337;
068:
069:            /** The highest year that can be fully supported. */
070:            private static final int MAX_YEAR = 292272708;
071:
072:            /** Cache of zone to chronology arrays */
073:            private static final Map cCache = new HashMap();
074:
075:            /** Singleton instance of a UTC CopticChronology */
076:            private static final CopticChronology INSTANCE_UTC;
077:            static {
078:                // init after static fields
079:                INSTANCE_UTC = getInstance(DateTimeZone.UTC);
080:            }
081:
082:            //-----------------------------------------------------------------------
083:            /**
084:             * Gets an instance of the CopticChronology.
085:             * The time zone of the returned instance is UTC.
086:             * 
087:             * @return a singleton UTC instance of the chronology
088:             */
089:            public static CopticChronology getInstanceUTC() {
090:                return INSTANCE_UTC;
091:            }
092:
093:            /**
094:             * Gets an instance of the CopticChronology in the default time zone.
095:             * 
096:             * @return a chronology in the default time zone
097:             */
098:            public static CopticChronology getInstance() {
099:                return getInstance(DateTimeZone.getDefault(), 4);
100:            }
101:
102:            /**
103:             * Gets an instance of the CopticChronology in the given time zone.
104:             * 
105:             * @param zone  the time zone to get the chronology in, null is default
106:             * @return a chronology in the specified time zone
107:             */
108:            public static CopticChronology getInstance(DateTimeZone zone) {
109:                return getInstance(zone, 4);
110:            }
111:
112:            /**
113:             * Gets an instance of the CopticChronology in the given time zone.
114:             * 
115:             * @param zone  the time zone to get the chronology in, null is default
116:             * @param minDaysInFirstWeek  minimum number of days in first week of the year; default is 4
117:             * @return a chronology in the specified time zone
118:             */
119:            public static CopticChronology getInstance(DateTimeZone zone,
120:                    int minDaysInFirstWeek) {
121:                if (zone == null) {
122:                    zone = DateTimeZone.getDefault();
123:                }
124:                CopticChronology chrono;
125:                synchronized (cCache) {
126:                    CopticChronology[] chronos = (CopticChronology[]) cCache
127:                            .get(zone);
128:                    if (chronos == null) {
129:                        chronos = new CopticChronology[7];
130:                        cCache.put(zone, chronos);
131:                    }
132:                    try {
133:                        chrono = chronos[minDaysInFirstWeek - 1];
134:                    } catch (ArrayIndexOutOfBoundsException e) {
135:                        throw new IllegalArgumentException(
136:                                "Invalid min days in first week: "
137:                                        + minDaysInFirstWeek);
138:                    }
139:                    if (chrono == null) {
140:                        if (zone == DateTimeZone.UTC) {
141:                            // First create without a lower limit.
142:                            chrono = new CopticChronology(null, null,
143:                                    minDaysInFirstWeek);
144:                            // Impose lower limit and make another CopticChronology.
145:                            DateTime lowerLimit = new DateTime(1, 1, 1, 0, 0,
146:                                    0, 0, chrono);
147:                            chrono = new CopticChronology(LimitChronology
148:                                    .getInstance(chrono, lowerLimit, null),
149:                                    null, minDaysInFirstWeek);
150:                        } else {
151:                            chrono = getInstance(DateTimeZone.UTC,
152:                                    minDaysInFirstWeek);
153:                            chrono = new CopticChronology(ZonedChronology
154:                                    .getInstance(chrono, zone), null,
155:                                    minDaysInFirstWeek);
156:                        }
157:                        chronos[minDaysInFirstWeek - 1] = chrono;
158:                    }
159:                }
160:                return chrono;
161:            }
162:
163:            // Constructors and instance variables
164:            //-----------------------------------------------------------------------
165:            /**
166:             * Restricted constructor.
167:             */
168:            CopticChronology(Chronology base, Object param,
169:                    int minDaysInFirstWeek) {
170:                super (base, param, minDaysInFirstWeek);
171:            }
172:
173:            /**
174:             * Serialization singleton.
175:             */
176:            private Object readResolve() {
177:                Chronology base = getBase();
178:                int minDays = getMinimumDaysInFirstWeek();
179:                minDays = (minDays == 0 ? 4 : minDays); // handle rename of BaseGJChronology
180:                return base == null ? getInstance(DateTimeZone.UTC, minDays)
181:                        : getInstance(base.getZone(), minDays);
182:            }
183:
184:            // Conversion
185:            //-----------------------------------------------------------------------
186:            /**
187:             * Gets the Chronology in the UTC time zone.
188:             * 
189:             * @return the chronology in UTC
190:             */
191:            public Chronology withUTC() {
192:                return INSTANCE_UTC;
193:            }
194:
195:            /**
196:             * Gets the Chronology in a specific time zone.
197:             * 
198:             * @param zone  the zone to get the chronology in, null is default
199:             * @return the chronology
200:             */
201:            public Chronology withZone(DateTimeZone zone) {
202:                if (zone == null) {
203:                    zone = DateTimeZone.getDefault();
204:                }
205:                if (zone == getZone()) {
206:                    return this ;
207:                }
208:                return getInstance(zone);
209:            }
210:
211:            //-----------------------------------------------------------------------
212:            long calculateFirstDayOfYearMillis(int year) {
213:                // Java epoch is 1970-01-01 Gregorian which is 1686-04-23 Coptic.
214:                // Calculate relative to the nearest leap year and account for the
215:                // difference later.
216:
217:                int relativeYear = year - 1687;
218:                int leapYears;
219:                if (relativeYear <= 0) {
220:                    // Add 3 before shifting right since /4 and >>2 behave differently
221:                    // on negative numbers.
222:                    leapYears = (relativeYear + 3) >> 2;
223:                } else {
224:                    leapYears = relativeYear >> 2;
225:                    // For post 1687 an adjustment is needed as jan1st is before leap day
226:                    if (!isLeapYear(year)) {
227:                        leapYears++;
228:                    }
229:                }
230:
231:                long millis = (relativeYear * 365L + leapYears)
232:                        * (long) DateTimeConstants.MILLIS_PER_DAY;
233:
234:                // Adjust to account for difference between 1687-01-01 and 1686-04-23.
235:
236:                return millis + (365L - 112) * DateTimeConstants.MILLIS_PER_DAY;
237:            }
238:
239:            //-----------------------------------------------------------------------
240:            int getMinYear() {
241:                return MIN_YEAR;
242:            }
243:
244:            //-----------------------------------------------------------------------
245:            int getMaxYear() {
246:                return MAX_YEAR;
247:            }
248:
249:            //-----------------------------------------------------------------------
250:            long getApproxMillisAtEpochDividedByTwo() {
251:                return (1686L * MILLIS_PER_YEAR + 112L * DateTimeConstants.MILLIS_PER_DAY) / 2;
252:            }
253:
254:            //-----------------------------------------------------------------------
255:            protected void assemble(Fields fields) {
256:                if (getBase() == null) {
257:                    super .assemble(fields);
258:
259:                    // Coptic, like Julian, has no year zero.
260:                    fields.year = new SkipDateTimeField(this , fields.year);
261:                    fields.weekyear = new SkipDateTimeField(this ,
262:                            fields.weekyear);
263:
264:                    fields.era = ERA_FIELD;
265:                    fields.monthOfYear = new BasicMonthOfYearDateTimeField(
266:                            this , 13);
267:                    fields.months = fields.monthOfYear.getDurationField();
268:                }
269:            }
270:
271:        }
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