| 1 | /* |
| 2 | * Copyright 2001-2005 Stephen Colebourne |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | package org.joda.time.chrono; |
| 17 | |
| 18 | import org.joda.time.DateTimeFieldType; |
| 19 | import org.joda.time.DurationField; |
| 20 | import org.joda.time.field.FieldUtils; |
| 21 | import org.joda.time.field.ImpreciseDateTimeField; |
| 22 | |
| 23 | /** |
| 24 | * A year field suitable for many calendars. |
| 25 | * |
| 26 | * @author Guy Allard |
| 27 | * @author Stephen Colebourne |
| 28 | * @author Brian S O'Neill |
| 29 | * @since 1.1, refactored from GJYearDateTimeField |
| 30 | */ |
| 31 | class BasicYearDateTimeField extends ImpreciseDateTimeField { |
| 32 | |
| 33 | /** Serialization version. */ |
| 34 | private static final long serialVersionUID = -98628754872287L; |
| 35 | |
| 36 | /** The underlying basic chronology. */ |
| 37 | protected final BasicChronology iChronology; |
| 38 | |
| 39 | /** |
| 40 | * Restricted constructor. |
| 41 | * |
| 42 | * @param chronology the chronology this field belogs to |
| 43 | */ |
| 44 | BasicYearDateTimeField(BasicChronology chronology) { |
| 45 | super(DateTimeFieldType.year(), chronology.getAverageMillisPerYear()); |
| 46 | iChronology = chronology; |
| 47 | } |
| 48 | |
| 49 | public boolean isLenient() { |
| 50 | return false; |
| 51 | } |
| 52 | |
| 53 | public int get(long instant) { |
| 54 | return iChronology.getYear(instant); |
| 55 | } |
| 56 | |
| 57 | public long add(long instant, int years) { |
| 58 | if (years == 0) { |
| 59 | return instant; |
| 60 | } |
| 61 | int thisYear = get(instant); |
| 62 | int newYear = FieldUtils.safeAdd(thisYear, years); |
| 63 | return set(instant, newYear); |
| 64 | } |
| 65 | |
| 66 | public long add(long instant, long years) { |
| 67 | return add(instant, FieldUtils.safeToInt(years)); |
| 68 | } |
| 69 | |
| 70 | public long addWrapField(long instant, int years) { |
| 71 | if (years == 0) { |
| 72 | return instant; |
| 73 | } |
| 74 | // Return newly calculated millis value |
| 75 | int thisYear = iChronology.getYear(instant); |
| 76 | int wrappedYear = FieldUtils.getWrappedValue |
| 77 | (thisYear, years, iChronology.getMinYear(), iChronology.getMaxYear()); |
| 78 | return set(instant, wrappedYear); |
| 79 | } |
| 80 | |
| 81 | public long set(long instant, int year) { |
| 82 | FieldUtils.verifyValueBounds |
| 83 | (this, year, iChronology.getMinYear(), iChronology.getMaxYear()); |
| 84 | return iChronology.setYear(instant, year); |
| 85 | } |
| 86 | |
| 87 | public long getDifferenceAsLong(long minuendInstant, long subtrahendInstant) { |
| 88 | if (minuendInstant < subtrahendInstant) { |
| 89 | return -iChronology.getYearDifference(subtrahendInstant, minuendInstant); |
| 90 | } |
| 91 | return iChronology.getYearDifference(minuendInstant, subtrahendInstant); |
| 92 | } |
| 93 | |
| 94 | public DurationField getRangeDurationField() { |
| 95 | return null; |
| 96 | } |
| 97 | |
| 98 | public boolean isLeap(long instant) { |
| 99 | return iChronology.isLeapYear(get(instant)); |
| 100 | } |
| 101 | |
| 102 | public int getLeapAmount(long instant) { |
| 103 | if (iChronology.isLeapYear(get(instant))) { |
| 104 | return 1; |
| 105 | } else { |
| 106 | return 0; |
| 107 | } |
| 108 | } |
| 109 | |
| 110 | public DurationField getLeapDurationField() { |
| 111 | return iChronology.days(); |
| 112 | } |
| 113 | |
| 114 | public int getMinimumValue() { |
| 115 | return iChronology.getMinYear(); |
| 116 | } |
| 117 | |
| 118 | public int getMaximumValue() { |
| 119 | return iChronology.getMaxYear(); |
| 120 | } |
| 121 | |
| 122 | public long roundFloor(long instant) { |
| 123 | return iChronology.getYearMillis(get(instant)); |
| 124 | } |
| 125 | |
| 126 | public long roundCeiling(long instant) { |
| 127 | int year = get(instant); |
| 128 | long yearStartMillis = iChronology.getYearMillis(year); |
| 129 | if (instant != yearStartMillis) { |
| 130 | // Bump up to start of next year. |
| 131 | instant = iChronology.getYearMillis(year + 1); |
| 132 | } |
| 133 | return instant; |
| 134 | } |
| 135 | |
| 136 | public long remainder(long instant) { |
| 137 | return instant - roundFloor(instant); |
| 138 | } |
| 139 | |
| 140 | /** |
| 141 | * Serialization singleton |
| 142 | */ |
| 143 | private Object readResolve() { |
| 144 | return iChronology.year(); |
| 145 | } |
| 146 | } |