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


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.ReadWritablePeriod;
21 import org.joda.time.ReadableDuration;
22
23 /**
24  * ReadableDurationConverter extracts milliseconds and chronology from a ReadableDuration.
25  *
26  * @author Stephen Colebourne
27  * @author Brian S O'Neill
28  * @since 1.0
29  */
30 class ReadableDurationConverter extends AbstractConverter
31         implements DurationConverter, PeriodConverter {
32
33     /**
34      * Singleton instance.
35      */
36     static final ReadableDurationConverter INSTANCE = new ReadableDurationConverter();
37
38     /**
39      * Restricted constructor.
40      */
41     protected ReadableDurationConverter() {
42         super();
43     }
44
45     //-----------------------------------------------------------------------
46 /**
47      * Extracts the millis from an object of this convertor's type.
48      *
49      * @param object the object to convert, must not be null
50      * @return the millisecond value
51      * @throws NullPointerException if the object is null
52      * @throws ClassCastException if the object is an invalid type
53      * @throws IllegalArgumentException if the object is invalid
54      */
55     public long getDurationMillis(Object JavaDoc object) {
56         return ((ReadableDuration) object).getMillis();
57     }
58
59     //-----------------------------------------------------------------------
60 /**
61      * Extracts duration values from an object of this converter's type, and
62      * sets them into the given ReadWritableDuration.
63      *
64      * @param writablePeriod period to get modified
65      * @param object the object to convert, must not be null
66      * @param chrono the chronology to use, must not be null
67      * @throws NullPointerException if the duration or object is null
68      * @throws ClassCastException if the object is an invalid type
69      * @throws IllegalArgumentException if the object is invalid
70      */
71     public void setInto(ReadWritablePeriod writablePeriod, Object JavaDoc object, Chronology chrono) {
72         ReadableDuration dur = (ReadableDuration) object;
73         chrono = DateTimeUtils.getChronology(chrono);
74         long duration = dur.getMillis();
75         int[] values = chrono.get(writablePeriod, duration);
76         for (int i = 0; i < values.length; i++) {
77             writablePeriod.setValue(i, values[i]);
78         }
79     }
80
81     //-----------------------------------------------------------------------
82 /**
83      * Returns ReadableDuration.class.
84      *
85      * @return ReadableDuration.class
86      */
87     public Class JavaDoc getSupportedType() {
88         return ReadableDuration.class;
89     }
90
91 }
92
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