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1   /*
2    *  Copyright 2001-2009 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 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 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 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 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<?> getSupportedType() {
113         return ReadableInterval.class;
114     }
115 
116 }