1 /*
2 * Copyright 2000-2004 Sun Microsystems, Inc. All Rights Reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Sun designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Sun in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
22 * CA 95054 USA or visit www.sun.com if you need additional information or
23 * have any questions.
24 */
25
26 package javax.swing;
27
28 import java.util;
29 import java.io.Serializable;
30
31
32 /**
33 * A <code>SpinnerModel</code> for sequences of <code>Date</code>s.
34 * The upper and lower bounds of the sequence are defined by properties called
35 * <code>start</code> and <code>end</code> and the size
36 * of the increase or decrease computed by the <code>nextValue</code>
37 * and <code>previousValue</code> methods is defined by a property
38 * called <code>calendarField</code>. The <code>start</code>
39 * and <code>end</code> properties can be <code>null</code> to
40 * indicate that the sequence has no lower or upper limit.
41 * <p>
42 * The value of the <code>calendarField</code> property must be one of the
43 * <code>java.util.Calendar</code> constants that specify a field
44 * within a <code>Calendar</code>. The <code>getNextValue</code>
45 * and <code>getPreviousValue</code>
46 * methods change the date forward or backwards by this amount.
47 * For example, if <code>calendarField</code> is <code>Calendar.DAY_OF_WEEK</code>,
48 * then <code>nextValue</code> produces a <code>Date</code> that's 24
49 * hours after the current <code>value</code>, and <code>previousValue</code>
50 * produces a <code>Date</code> that's 24 hours earlier.
51 * <p>
52 * The legal values for <code>calendarField</code> are:
53 * <ul>
54 * <li><code>Calendar.ERA</code>
55 * <li><code>Calendar.YEAR</code>
56 * <li><code>Calendar.MONTH</code>
57 * <li><code>Calendar.WEEK_OF_YEAR</code>
58 * <li><code>Calendar.WEEK_OF_MONTH</code>
59 * <li><code>Calendar.DAY_OF_MONTH</code>
60 * <li><code>Calendar.DAY_OF_YEAR</code>
61 * <li><code>Calendar.DAY_OF_WEEK</code>
62 * <li><code>Calendar.DAY_OF_WEEK_IN_MONTH</code>
63 * <li><code>Calendar.AM_PM</code>
64 * <li><code>Calendar.HOUR</code>
65 * <li><code>Calendar.HOUR_OF_DAY</code>
66 * <li><code>Calendar.MINUTE</code>
67 * <li><code>Calendar.SECOND</code>
68 * <li><code>Calendar.MILLISECOND</code>
69 * </ul>
70 * However some UIs may set the calendarField before commiting the edit
71 * to spin the field under the cursor. If you only want one field to
72 * spin you can subclass and ignore the setCalendarField calls.
73 * <p>
74 * This model inherits a <code>ChangeListener</code>. The
75 * <code>ChangeListeners</code> are notified whenever the models
76 * <code>value</code>, <code>calendarField</code>,
77 * <code>start</code>, or <code>end</code> properties changes.
78 *
79 * @see JSpinner
80 * @see SpinnerModel
81 * @see AbstractSpinnerModel
82 * @see SpinnerListModel
83 * @see SpinnerNumberModel
84 * @see Calendar#add
85 *
86 * @author Hans Muller
87 * @since 1.4
88 */
89 public class SpinnerDateModel extends AbstractSpinnerModel implements Serializable
90 {
91 private Comparable start, end;
92 private Calendar value;
93 private int calendarField;
94
95
96 private boolean calendarFieldOK(int calendarField) {
97 switch(calendarField) {
98 case Calendar.ERA:
99 case Calendar.YEAR:
100 case Calendar.MONTH:
101 case Calendar.WEEK_OF_YEAR:
102 case Calendar.WEEK_OF_MONTH:
103 case Calendar.DAY_OF_MONTH:
104 case Calendar.DAY_OF_YEAR:
105 case Calendar.DAY_OF_WEEK:
106 case Calendar.DAY_OF_WEEK_IN_MONTH:
107 case Calendar.AM_PM:
108 case Calendar.HOUR:
109 case Calendar.HOUR_OF_DAY:
110 case Calendar.MINUTE:
111 case Calendar.SECOND:
112 case Calendar.MILLISECOND:
113 return true;
114 default:
115 return false;
116 }
117 }
118
119
120 /**
121 * Creates a <code>SpinnerDateModel</code> that represents a sequence of dates
122 * between <code>start</code> and <code>end</code>. The
123 * <code>nextValue</code> and <code>previousValue</code> methods
124 * compute elements of the sequence by advancing or reversing
125 * the current date <code>value</code> by the
126 * <code>calendarField</code> time unit. For a precise description
127 * of what it means to increment or decrement a <code>Calendar</code>
128 * <code>field</code>, see the <code>add</code> method in
129 * <code>java.util.Calendar</code>.
130 * <p>
131 * The <code>start</code> and <code>end</code> parameters can be
132 * <code>null</code> to indicate that the range doesn't have an
133 * upper or lower bound. If <code>value</code> or
134 * <code>calendarField</code> is <code>null</code>, or if both
135 * <code>start</code> and <code>end</code> are specified and
136 * <code>mininum > maximum</code> then an
137 * <code>IllegalArgumentException</code> is thrown.
138 * Similarly if <code>(minimum <= value <= maximum)</code> is false,
139 * an IllegalArgumentException is thrown.
140 *
141 * @param value the current (non <code>null</code>) value of the model
142 * @param start the first date in the sequence or <code>null</code>
143 * @param end the last date in the sequence or <code>null</code>
144 * @param calendarField one of
145 * <ul>
146 * <li><code>Calendar.ERA</code>
147 * <li><code>Calendar.YEAR</code>
148 * <li><code>Calendar.MONTH</code>
149 * <li><code>Calendar.WEEK_OF_YEAR</code>
150 * <li><code>Calendar.WEEK_OF_MONTH</code>
151 * <li><code>Calendar.DAY_OF_MONTH</code>
152 * <li><code>Calendar.DAY_OF_YEAR</code>
153 * <li><code>Calendar.DAY_OF_WEEK</code>
154 * <li><code>Calendar.DAY_OF_WEEK_IN_MONTH</code>
155 * <li><code>Calendar.AM_PM</code>
156 * <li><code>Calendar.HOUR</code>
157 * <li><code>Calendar.HOUR_OF_DAY</code>
158 * <li><code>Calendar.MINUTE</code>
159 * <li><code>Calendar.SECOND</code>
160 * <li><code>Calendar.MILLISECOND</code>
161 * </ul>
162 *
163 * @throws IllegalArgumentException if <code>value</code> or
164 * <code>calendarField</code> are <code>null</code>,
165 * if <code>calendarField</code> isn't valid,
166 * or if the following expression is
167 * false: <code>(start <= value <= end)</code>.
168 *
169 * @see Calendar#add
170 * @see #setValue
171 * @see #setStart
172 * @see #setEnd
173 * @see #setCalendarField
174 */
175 public SpinnerDateModel(Date value, Comparable start, Comparable end, int calendarField) {
176 if (value == null) {
177 throw new IllegalArgumentException("value is null");
178 }
179 if (!calendarFieldOK(calendarField)) {
180 throw new IllegalArgumentException("invalid calendarField");
181 }
182 if (!(((start == null) || (start.compareTo(value) <= 0)) &&
183 ((end == null) || (end.compareTo(value) >= 0)))) {
184 throw new IllegalArgumentException("(start <= value <= end) is false");
185 }
186 this.value = Calendar.getInstance();
187 this.start = start;
188 this.end = end;
189 this.calendarField = calendarField;
190
191 this.value.setTime(value);
192 }
193
194
195 /**
196 * Constructs a <code>SpinnerDateModel</code> whose initial
197 * <code>value</code> is the current date, <code>calendarField</code>
198 * is equal to <code>Calendar.DAY_OF_MONTH</code>, and for which
199 * there are no <code>start</code>/<code>end</code> limits.
200 */
201 public SpinnerDateModel() {
202 this(new Date(), null, null, Calendar.DAY_OF_MONTH);
203 }
204
205
206 /**
207 * Changes the lower limit for Dates in this sequence.
208 * If <code>start</code> is <code>null</code>,
209 * then there is no lower limit. No bounds checking is done here:
210 * the new start value may invalidate the
211 * <code>(start <= value <= end)</code>
212 * invariant enforced by the constructors. This is to simplify updating
213 * the model. Naturally one should ensure that the invariant is true
214 * before calling the <code>nextValue</code>, <code>previousValue</code>,
215 * or <code>setValue</code> methods.
216 * <p>
217 * Typically this property is a <code>Date</code> however it's possible to use
218 * a <code>Comparable</code> with a <code>compareTo</code> method for Dates.
219 * For example <code>start</code> might be an instance of a class like this:
220 * <pre>
221 * MyStartDate implements Comparable {
222 * long t = 12345;
223 * public int compareTo(Date d) {
224 * return (t < d.getTime() ? -1 : (t == d.getTime() ? 0 : 1));
225 * }
226 * public int compareTo(Object o) {
227 * return compareTo((Date)o);
228 * }
229 * }
230 * </pre>
231 * Note that the above example will throw a <code>ClassCastException</code>
232 * if the <code>Object</code> passed to <code>compareTo(Object)</code>
233 * is not a <code>Date</code>.
234 * <p>
235 * This method fires a <code>ChangeEvent</code> if the
236 * <code>start</code> has changed.
237 *
238 * @param start defines the first date in the sequence
239 * @see #getStart
240 * @see #setEnd
241 * @see #addChangeListener
242 */
243 public void setStart(Comparable start) {
244 if ((start == null) ? (this.start != null) : !start.equals(this.start)) {
245 this.start = start;
246 fireStateChanged();
247 }
248 }
249
250
251 /**
252 * Returns the first <code>Date</code> in the sequence.
253 *
254 * @return the value of the <code>start</code> property
255 * @see #setStart
256 */
257 public Comparable getStart() {
258 return start;
259 }
260
261
262 /**
263 * Changes the upper limit for <code>Date</code>s in this sequence.
264 * If <code>start</code> is <code>null</code>, then there is no upper
265 * limit. No bounds checking is done here: the new
266 * start value may invalidate the <code>(start <= value <= end)</code>
267 * invariant enforced by the constructors. This is to simplify updating
268 * the model. Naturally, one should ensure that the invariant is true
269 * before calling the <code>nextValue</code>, <code>previousValue</code>,
270 * or <code>setValue</code> methods.
271 * <p>
272 * Typically this property is a <code>Date</code> however it's possible to use
273 * <code>Comparable</code> with a <code>compareTo</code> method for
274 * <code>Date</code>s. See <code>setStart</code> for an example.
275 * <p>
276 * This method fires a <code>ChangeEvent</code> if the <code>end</code>
277 * has changed.
278 *
279 * @param end defines the last date in the sequence
280 * @see #getEnd
281 * @see #setStart
282 * @see #addChangeListener
283 */
284 public void setEnd(Comparable end) {
285 if ((end == null) ? (this.end != null) : !end.equals(this.end)) {
286 this.end = end;
287 fireStateChanged();
288 }
289 }
290
291
292 /**
293 * Returns the last <code>Date</code> in the sequence.
294 *
295 * @return the value of the <code>end</code> property
296 * @see #setEnd
297 */
298 public Comparable getEnd() {
299 return end;
300 }
301
302
303 /**
304 * Changes the size of the date value change computed
305 * by the <code>nextValue</code> and <code>previousValue</code> methods.
306 * The <code>calendarField</code> parameter must be one of the
307 * <code>Calendar</code> field constants like <code>Calendar.MONTH</code>
308 * or <code>Calendar.MINUTE</code>.
309 * The <code>nextValue</code> and <code>previousValue</code> methods
310 * simply move the specified <code>Calendar</code> field forward or backward
311 * by one unit with the <code>Calendar.add</code> method.
312 * You should use this method with care as some UIs may set the
313 * calendarField before commiting the edit to spin the field under
314 * the cursor. If you only want one field to spin you can subclass
315 * and ignore the setCalendarField calls.
316 *
317 * @param calendarField one of
318 * <ul>
319 * <li><code>Calendar.ERA</code>
320 * <li><code>Calendar.YEAR</code>
321 * <li><code>Calendar.MONTH</code>
322 * <li><code>Calendar.WEEK_OF_YEAR</code>
323 * <li><code>Calendar.WEEK_OF_MONTH</code>
324 * <li><code>Calendar.DAY_OF_MONTH</code>
325 * <li><code>Calendar.DAY_OF_YEAR</code>
326 * <li><code>Calendar.DAY_OF_WEEK</code>
327 * <li><code>Calendar.DAY_OF_WEEK_IN_MONTH</code>
328 * <li><code>Calendar.AM_PM</code>
329 * <li><code>Calendar.HOUR</code>
330 * <li><code>Calendar.HOUR_OF_DAY</code>
331 * <li><code>Calendar.MINUTE</code>
332 * <li><code>Calendar.SECOND</code>
333 * <li><code>Calendar.MILLISECOND</code>
334 * </ul>
335 * <p>
336 * This method fires a <code>ChangeEvent</code> if the
337 * <code>calendarField</code> has changed.
338 *
339 * @see #getCalendarField
340 * @see #getNextValue
341 * @see #getPreviousValue
342 * @see Calendar#add
343 * @see #addChangeListener
344 */
345 public void setCalendarField(int calendarField) {
346 if (!calendarFieldOK(calendarField)) {
347 throw new IllegalArgumentException("invalid calendarField");
348 }
349 if (calendarField != this.calendarField) {
350 this.calendarField = calendarField;
351 fireStateChanged();
352 }
353 }
354
355
356 /**
357 * Returns the <code>Calendar</code> field that is added to or subtracted from
358 * by the <code>nextValue</code> and <code>previousValue</code> methods.
359 *
360 * @return the value of the <code>calendarField</code> property
361 * @see #setCalendarField
362 */
363 public int getCalendarField() {
364 return calendarField;
365 }
366
367
368 /**
369 * Returns the next <code>Date</code> in the sequence, or <code>null</code> if
370 * the next date is after <code>end</code>.
371 *
372 * @return the next <code>Date</code> in the sequence, or <code>null</code> if
373 * the next date is after <code>end</code>.
374 *
375 * @see SpinnerModel#getNextValue
376 * @see #getPreviousValue
377 * @see #setCalendarField
378 */
379 public Object getNextValue() {
380 Calendar cal = Calendar.getInstance();
381 cal.setTime(value.getTime());
382 cal.add(calendarField, 1);
383 Date next = cal.getTime();
384 return ((end == null) || (end.compareTo(next) >= 0)) ? next : null;
385 }
386
387
388 /**
389 * Returns the previous <code>Date</code> in the sequence, or <code>null</code>
390 * if the previous date is before <code>start</code>.
391 *
392 * @return the previous <code>Date</code> in the sequence, or
393 * <code>null</code> if the previous date
394 * is before <code>start</code>
395 *
396 * @see SpinnerModel#getPreviousValue
397 * @see #getNextValue
398 * @see #setCalendarField
399 */
400 public Object getPreviousValue() {
401 Calendar cal = Calendar.getInstance();
402 cal.setTime(value.getTime());
403 cal.add(calendarField, -1);
404 Date prev = cal.getTime();
405 return ((start == null) || (start.compareTo(prev) <= 0)) ? prev : null;
406 }
407
408
409 /**
410 * Returns the current element in this sequence of <code>Date</code>s.
411 * This method is equivalent to <code>(Date)getValue</code>.
412 *
413 * @return the <code>value</code> property
414 * @see #setValue
415 */
416 public Date getDate() {
417 return value.getTime();
418 }
419
420
421 /**
422 * Returns the current element in this sequence of <code>Date</code>s.
423 *
424 * @return the <code>value</code> property
425 * @see #setValue
426 * @see #getDate
427 */
428 public Object getValue() {
429 return value.getTime();
430 }
431
432
433 /**
434 * Sets the current <code>Date</code> for this sequence.
435 * If <code>value</code> is <code>null</code>,
436 * an <code>IllegalArgumentException</code> is thrown. No bounds
437 * checking is done here:
438 * the new value may invalidate the <code>(start <= value < end)</code>
439 * invariant enforced by the constructors. Naturally, one should ensure
440 * that the <code>(start <= value <= maximum)</code> invariant is true
441 * before calling the <code>nextValue</code>, <code>previousValue</code>,
442 * or <code>setValue</code> methods.
443 * <p>
444 * This method fires a <code>ChangeEvent</code> if the
445 * <code>value</code> has changed.
446 *
447 * @param value the current (non <code>null</code>)
448 * <code>Date</code> for this sequence
449 * @throws IllegalArgumentException if value is <code>null</code>
450 * or not a <code>Date</code>
451 * @see #getDate
452 * @see #getValue
453 * @see #addChangeListener
454 */
455 public void setValue(Object value) {
456 if ((value == null) || !(value instanceof Date)) {
457 throw new IllegalArgumentException("illegal value");
458 }
459 if (!value.equals(this.value.getTime())) {
460 this.value.setTime((Date)value);
461 fireStateChanged();
462 }
463 }
464 }
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