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Java > Open Source Codes > org > joda > time > chrono > GJYearOfEraDateTimeField


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.DateTimeField;
19 import org.joda.time.DateTimeFieldType;
20 import org.joda.time.ReadablePartial;
21 import org.joda.time.field.DecoratedDateTimeField;
22 import org.joda.time.field.FieldUtils;
23
24 /**
25  * Provides time calculations for the year of era component of time.
26  *
27  * @author Brian S O'Neill
28  * @since 1.0
29  */

30 final class GJYearOfEraDateTimeField extends DecoratedDateTimeField {
31
32     private static final long serialVersionUID = -5961050944769862059L;
33
34     private final BasicChronology iChronology;
35
36     /**
37      * Restricted constructor.
38      */

39     GJYearOfEraDateTimeField(DateTimeField yearField, BasicChronology chronology) {
40         super(yearField, DateTimeFieldType.yearOfEra());
41         iChronology = chronology;
42     }
43
44     public int get(long instant) {
45         int year = getWrappedField().get(instant);
46         if (year <= 0) {
47             year = 1 - year;
48         }
49         return year;
50     }
51
52     public long add(long instant, int years) {
53         return getWrappedField().add(instant, years);
54     }
55
56     public long add(long instant, long years) {
57         return getWrappedField().add(instant, years);
58     }
59
60     public long addWrapField(long instant, int years) {
61         return getWrappedField().addWrapField(instant, years);
62     }
63
64     public int[] addWrapField(ReadablePartial instant, int fieldIndex, int[] values, int years) {
65         return getWrappedField().addWrapField(instant, fieldIndex, values, years);
66     }
67
68     public int getDifference(long minuendInstant, long subtrahendInstant) {
69         return getWrappedField().getDifference(minuendInstant, subtrahendInstant);
70     }
71
72     public long getDifferenceAsLong(long minuendInstant, long subtrahendInstant) {
73         return getWrappedField().getDifferenceAsLong(minuendInstant, subtrahendInstant);
74     }
75
76     /**
77      * Set the year component of the specified time instant.
78      *
79      * @param instant the time instant in millis to update.
80      * @param year the year (0,292278994) to update the time to.
81      * @return the updated time instant.
82      * @throws IllegalArgumentException if year is invalid.
83      */

84     public long set(long instant, int year) {
85         FieldUtils.verifyValueBounds(this, year, 1, getMaximumValue());
86         if (iChronology.getYear(instant) <= 0) {
87             year = 1 - year;
88         }
89         return super.set(instant, year);
90     }
91
92     public int getMinimumValue() {
93         return 1;
94     }
95
96     public int getMaximumValue() {
97         return getWrappedField().getMaximumValue();
98     }
99
100     public long roundFloor(long instant) {
101         return getWrappedField().roundFloor(instant);
102     }
103
104     public long roundCeiling(long instant) {
105         return getWrappedField().roundCeiling(instant);
106     }
107
108     public long remainder(long instant) {
109         return getWrappedField().remainder(instant);
110     }
111
112     /**
113      * Serialization singleton
114      */

115     private Object JavaDoc readResolve() {
116         return iChronology.yearOfEra();
117     }
118 }
119
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