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Java > Open Source Codes > org > joda > time > convert > ReadableIntervalConverter


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.convert;
17
18 import org.joda.time.Chronology;
19 import org.joda.time.DateTimeUtils;
20 import org.joda.time.ReadWritableInterval;
21 import org.joda.time.ReadWritablePeriod;
22 import org.joda.time.ReadableInterval;
23
24 /**
25  * Converts intervals into durations of any requested period type.
26  *
27  * @author Brian S O'Neill
28  * @since 1.0
29  */
30 class ReadableIntervalConverter extends AbstractConverter
31         implements IntervalConverter, DurationConverter, PeriodConverter {
32
33     /**
34      * Singleton instance.
35      */
36     static final ReadableIntervalConverter INSTANCE = new ReadableIntervalConverter();
37
38     /**
39      * Restricted constructor.
40      */
41     protected ReadableIntervalConverter() {
42         super();
43     }
44
45     //-----------------------------------------------------------------------
46 /**
47      * Gets the millisecond length of the interval.
48      *
49      * @param object the interval
50      */
51     public long getDurationMillis(Object JavaDoc object) {
52         return (((ReadableInterval) object)).toDurationMillis();
53     }
54
55     //-----------------------------------------------------------------------
56 /**
57      * Sets the values of the mutable duration from the specified interval.
58      *
59      * @param writablePeriod the period to modify
60      * @param object the interval to set from
61      * @param chrono the chronology to use
62      */
63     public void setInto(ReadWritablePeriod writablePeriod, Object JavaDoc object, Chronology chrono) {
64         ReadableInterval interval = (ReadableInterval) object;
65         chrono = (chrono != null ? chrono : DateTimeUtils.getIntervalChronology(interval));
66         long start = interval.getStartMillis();
67         long end = interval.getEndMillis();
68         int[] values = chrono.get(writablePeriod, start, end);
69         for (int i = 0; i < values.length; i++) {
70             writablePeriod.setValue(i, values[i]);
71         }
72     }
73
74     //-----------------------------------------------------------------------
75 /**
76      * Checks if the input is a ReadableInterval.
77      * <p>
78      * If it is, then the calling code should cast and copy the fields directly.
79      *
80      * @param object the object to convert, must not be null
81      * @param chrono the chronology to use, may be null
82      * @return true if the input is a ReadableInterval
83      * @throws ClassCastException if the object is invalid
84      */
85     public boolean isReadableInterval(Object JavaDoc object, Chronology chrono) {
86         return true;
87     }
88
89     /**
90      * Extracts interval endpoint values from an object of this converter's
91      * type, and sets them into the given ReadWritableInterval.
92      *
93      * @param writableInterval interval to get modified, not null
94      * @param object the object to convert, must not be null
95      * @param chrono the chronology to use, may be null
96      * @throws ClassCastException if the object is invalid
97      */
98     public void setInto(ReadWritableInterval writableInterval, Object JavaDoc object, Chronology chrono) {
99         ReadableInterval input = (ReadableInterval) object;
100         writableInterval.setInterval(input);
101         if (chrono != null) {
102             writableInterval.setChronology(chrono);
103         } else {
104             writableInterval.setChronology(input.getChronology());
105         }
106     }
107
108     //-----------------------------------------------------------------------
109 /**
110      * Returns ReadableInterval.class.
111      */
112     public Class JavaDoc getSupportedType() {
113         return ReadableInterval.class;
114     }
115
116 }
117
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