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


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.DateTimeConstants;
19 import org.joda.time.DateTimeFieldType;
20 import org.joda.time.DurationField;
21 import org.joda.time.ReadablePartial;
22 import org.joda.time.field.PreciseDurationDateTimeField;
23
24 /**
25  * Provides time calculations for the week of a week based year component of time.
26  *
27  * @author Guy Allard
28  * @author Stephen Colebourne
29  * @author Brian S O'Neill
30  * @since 1.1, refactored from GJWeekOfWeekyearDateTimeField
31  */

32 final class BasicWeekOfWeekyearDateTimeField extends PreciseDurationDateTimeField {
33
34     private static final long serialVersionUID = -1587436826395135328L;
35
36     private final BasicChronology iChronology;
37
38     /**
39      * Restricted constructor
40      */

41     BasicWeekOfWeekyearDateTimeField(BasicChronology chronology, DurationField weeks) {
42         super(DateTimeFieldType.weekOfWeekyear(), weeks);
43         iChronology = chronology;
44     }
45
46     /**
47      * Get the week of a week based year component of the specified time instant.
48      *
49      * @see org.joda.time.DateTimeField#get(long)
50      * @param instant the time instant in millis to query.
51      * @return the week of the year extracted from the input.
52      */

53     public int get(long instant) {
54         return iChronology.getWeekOfWeekyear(instant);
55     }
56
57     public DurationField getRangeDurationField() {
58         return iChronology.weekyears();
59     }
60
61     // 1970-01-01 is day of week 4, Thursday. The rounding methods need to
62
// apply a corrective alignment since weeks begin on day of week 1, Monday.
63

64     public long roundFloor(long instant) {
65         return super.roundFloor(instant + 3 * DateTimeConstants.MILLIS_PER_DAY)
66             - 3 * DateTimeConstants.MILLIS_PER_DAY;
67     }
68
69     public long roundCeiling(long instant) {
70         return super.roundCeiling(instant + 3 * DateTimeConstants.MILLIS_PER_DAY)
71             - 3 * DateTimeConstants.MILLIS_PER_DAY;
72     }
73
74     public long remainder(long instant) {
75         return super.remainder(instant + 3 * DateTimeConstants.MILLIS_PER_DAY);
76     }
77
78     public int getMinimumValue() {
79         return 1;
80     }
81
82     public int getMaximumValue() {
83         return 53;
84     }
85
86     public int getMaximumValue(long instant) {
87         int weekyear = iChronology.getWeekyear(instant);
88         return iChronology.getWeeksInYear(weekyear);
89     }
90
91     public int getMaximumValue(ReadablePartial partial) {
92         if (partial.isSupported(DateTimeFieldType.weekyear())) {
93             int weekyear = partial.get(DateTimeFieldType.weekyear());
94             return iChronology.getWeeksInYear(weekyear);
95         }
96         return 53;
97     }
98
99     public int getMaximumValue(ReadablePartial partial, int[] values) {
100         int size = partial.size();
101         for (int i = 0; i < size; i++) {
102             if (partial.getFieldType(i) == DateTimeFieldType.weekyear()) {
103                 int weekyear = values[i];
104                 return iChronology.getWeeksInYear(weekyear);
105             }
106         }
107         return 53;
108     }
109
110     protected int getMaximumValueForSet(long instant, int value) {
111         return value > 52 ? getMaximumValue(instant) : 52;
112     }
113
114     /**
115      * Serialization singleton
116      */

117     private Object JavaDoc readResolve() {
118         return iChronology.weekOfWeekyear();
119     }
120 }
121
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