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Java > Open Source Codes > org > joda > time > base > BaseInterval


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.base;
17
18 import java.io.Serializable JavaDoc;
19
20 import org.joda.time.Chronology;
21 import org.joda.time.DateTimeUtils;
22 import org.joda.time.MutableInterval;
23 import org.joda.time.ReadWritableInterval;
24 import org.joda.time.ReadableDuration;
25 import org.joda.time.ReadableInstant;
26 import org.joda.time.ReadableInterval;
27 import org.joda.time.ReadablePeriod;
28 import org.joda.time.chrono.ISOChronology;
29 import org.joda.time.convert.ConverterManager;
30 import org.joda.time.convert.IntervalConverter;
31 import org.joda.time.field.FieldUtils;
32
33 /**
34  * BaseInterval is an abstract implementation of ReadableInterval that stores
35  * data in two <code>long</code> millisecond fields.
36  * <p>
37  * This class should generally not be used directly by API users.
38  * The {@link ReadableInterval} interface should be used when different
39  * kinds of interval objects are to be referenced.
40  * <p>
41  * BaseInterval subclasses may be mutable and not thread-safe.
42  *
43  * @author Brian S O'Neill
44  * @author Sean Geoghegan
45  * @author Stephen Colebourne
46  * @since 1.0
47  */
48 public abstract class BaseInterval
49         extends AbstractInterval
50         implements ReadableInterval, Serializable JavaDoc {
51
52     /** Serialization version */
53     private static final long serialVersionUID = 576586928732749278L;
54
55     /** The chronology of the interval */
56     private Chronology iChronology;
57     /** The start of the interval */
58     private long iStartMillis;
59     /** The end of the interval */
60     private long iEndMillis;
61
62     /**
63      * Constructs an interval from a start and end instant.
64      *
65      * @param startInstant start of this interval, as milliseconds from 1970-01-01T00:00:00Z.
66      * @param endInstant end of this interval, as milliseconds from 1970-01-01T00:00:00Z.
67      * @param chrono the chronology to use, null is ISO default
68      * @throws IllegalArgumentException if the end is before the start
69      */
70     protected BaseInterval(long startInstant, long endInstant, Chronology chrono) {
71         super();
72         iChronology = DateTimeUtils.getChronology(chrono);
73         checkInterval(startInstant, endInstant);
74         iStartMillis = startInstant;
75         iEndMillis = endInstant;
76     }
77
78     /**
79      * Constructs an interval from a start and end instant.
80      *
81      * @param start start of this interval, null means now
82      * @param end end of this interval, null means now
83      * @throws IllegalArgumentException if the end is before the start
84      */
85     protected BaseInterval(ReadableInstant start, ReadableInstant end) {
86         super();
87         if (start == null && end == null) {
88             iStartMillis = iEndMillis = DateTimeUtils.currentTimeMillis();
89             iChronology = ISOChronology.getInstance();
90         } else {
91             iChronology = DateTimeUtils.getInstantChronology(start);
92             iStartMillis = DateTimeUtils.getInstantMillis(start);
93             iEndMillis = DateTimeUtils.getInstantMillis(end);
94             checkInterval(iStartMillis, iEndMillis);
95         }
96     }
97
98     /**
99      * Constructs an interval from a start instant and a duration.
100      *
101      * @param start start of this interval, null means now
102      * @param duration the duration of this interval, null means zero length
103      * @throws IllegalArgumentException if the end is before the start
104      * @throws ArithmeticException if the end instant exceeds the capacity of a long
105      */
106     protected BaseInterval(ReadableInstant start, ReadableDuration duration) {
107         super();
108         iChronology = DateTimeUtils.getInstantChronology(start);
109         iStartMillis = DateTimeUtils.getInstantMillis(start);
110         long durationMillis = DateTimeUtils.getDurationMillis(duration);
111         iEndMillis = FieldUtils.safeAdd(iStartMillis, durationMillis);
112         checkInterval(iStartMillis, iEndMillis);
113     }
114
115     /**
116      * Constructs an interval from a millisecond duration and an end instant.
117      *
118      * @param duration the duration of this interval, null means zero length
119      * @param end end of this interval, null means now
120      * @throws IllegalArgumentException if the end is before the start
121      * @throws ArithmeticException if the start instant exceeds the capacity of a long
122      */
123     protected BaseInterval(ReadableDuration duration, ReadableInstant end) {
124         super();
125         iChronology = DateTimeUtils.getInstantChronology(end);
126         iEndMillis = DateTimeUtils.getInstantMillis(end);
127         long durationMillis = DateTimeUtils.getDurationMillis(duration);
128         iStartMillis = FieldUtils.safeAdd(iEndMillis, -durationMillis);
129         checkInterval(iStartMillis, iEndMillis);
130     }
131
132     /**
133      * Constructs an interval from a start instant and a time period.
134      * <p>
135      * When forming the interval, the chronology from the instant is used
136      * if present, otherwise the chronology of the period is used.
137      *
138      * @param start start of this interval, null means now
139      * @param period the period of this interval, null means zero length
140      * @throws IllegalArgumentException if the end is before the start
141      * @throws ArithmeticException if the end instant exceeds the capacity of a long
142      */
143     protected BaseInterval(ReadableInstant start, ReadablePeriod period) {
144         super();
145         Chronology chrono = DateTimeUtils.getInstantChronology(start);
146         iChronology = chrono;
147         iStartMillis = DateTimeUtils.getInstantMillis(start);
148         if (period == null) {
149             iEndMillis = iStartMillis;
150         } else {
151             iEndMillis = chrono.add(period, iStartMillis, 1);
152         }
153         checkInterval(iStartMillis, iEndMillis);
154     }
155
156     /**
157      * Constructs an interval from a time period and an end instant.
158      * <p>
159      * When forming the interval, the chronology from the instant is used
160      * if present, otherwise the chronology of the period is used.
161      *
162      * @param period the period of this interval, null means zero length
163      * @param end end of this interval, null means now
164      * @throws IllegalArgumentException if the end is before the start
165      * @throws ArithmeticException if the start instant exceeds the capacity of a long
166      */
167     protected BaseInterval(ReadablePeriod period, ReadableInstant end) {
168         super();
169         Chronology chrono = DateTimeUtils.getInstantChronology(end);
170         iChronology = chrono;
171         iEndMillis = DateTimeUtils.getInstantMillis(end);
172         if (period == null) {
173             iStartMillis = iEndMillis;
174         } else {
175             iStartMillis = chrono.add(period, iEndMillis, -1);
176         }
177         checkInterval(iStartMillis, iEndMillis);
178     }
179
180     /**
181      * Constructs a time interval converting or copying from another object
182      * that describes an interval.
183      *
184      * @param interval the time interval to copy
185      * @param chrono the chronology to use, null means let converter decide
186      * @throws IllegalArgumentException if the interval is invalid
187      */
188     protected BaseInterval(Object JavaDoc interval, Chronology chrono) {
189         super();
190         IntervalConverter converter = ConverterManager.getInstance().getIntervalConverter(interval);
191         if (converter.isReadableInterval(interval, chrono)) {
192             ReadableInterval input = (ReadableInterval) interval;
193             iChronology = (chrono != null ? chrono : input.getChronology());
194             iStartMillis = input.getStartMillis();
195             iEndMillis = input.getEndMillis();
196         } else if (this instanceof ReadWritableInterval) {
197             converter.setInto((ReadWritableInterval) this, interval, chrono);
198         } else {
199             MutableInterval mi = new MutableInterval();
200             converter.setInto(mi, interval, chrono);
201             iChronology = mi.getChronology();
202             iStartMillis = mi.getStartMillis();
203             iEndMillis = mi.getEndMillis();
204         }
205         checkInterval(iStartMillis, iEndMillis);
206     }
207
208     //-----------------------------------------------------------------------
209 /**
210      * Gets the chronology of this interval.
211      *
212      * @return the chronology
213      */
214     public Chronology getChronology() {
215         return iChronology;
216     }
217
218     /**
219      * Gets the start of this time interval which is inclusive.
220      *
221      * @return the start of the time interval,
222      * millisecond instant from 1970-01-01T00:00:00Z
223      */
224     public long getStartMillis() {
225         return iStartMillis;
226     }
227
228     /**
229      * Gets the end of this time interval which is exclusive.
230      *
231      * @return the end of the time interval,
232      * millisecond instant from 1970-01-01T00:00:00Z
233      */
234     public long getEndMillis() {
235         return iEndMillis;
236     }
237
238     //-----------------------------------------------------------------------
239 /**
240      * Sets this interval from two millisecond instants and a chronology.
241      *
242      * @param startInstant the start of the time interval
243      * @param endInstant the start of the time interval
244      * @param chrono the chronology, not null
245      * @throws IllegalArgumentException if the end is before the start
246      */
247     protected void setInterval(long startInstant, long endInstant, Chronology chrono) {
248         checkInterval(startInstant, endInstant);
249         iStartMillis = startInstant;
250         iEndMillis = endInstant;
251         iChronology = DateTimeUtils.getChronology(chrono);
252     }
253
254 }
255
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