J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 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 numbers. |
| 34 | * The upper and lower bounds of the sequence are defined |
| 35 | * by properties called <code>minimum</code> and |
| 36 | * <code>maximum</code>. The size of the increase or decrease |
| 37 | * computed by the <code>nextValue</code> and |
| 38 | * <code>previousValue</code> methods is defined by a property called |
| 39 | * <code>stepSize</code>. The <code>minimum</code> and |
| 40 | * <code>maximum</code> properties can be <code>null</code> |
| 41 | * to indicate that the sequence has no lower or upper limit. |
| 42 | * All of the properties in this class are defined in terms of two |
| 43 | * generic types: <code>Number</code> and |
| 44 | * <code>Comparable</code>, so that all Java numeric types |
| 45 | * may be accommodated. Internally, there's only support for |
| 46 | * values whose type is one of the primitive <code>Number</code> types: |
| 47 | * <code>Double</code>, <code>Float</code>, <code>Long</code>, |
| 48 | * <code>Integer</code>, <code>Short</code>, or <code>Byte</code>. |
| 49 | * <p> |
| 50 | * To create a <code>SpinnerNumberModel</code> for the integer |
| 51 | * range zero to one hundred, with |
| 52 | * fifty as the initial value, one could write: |
| 53 | * <pre> |
| 54 | * Integer value = new Integer(50); |
| 55 | * Integer min = new Integer(0); |
| 56 | * Integer max = new Integer(100); |
| 57 | * Integer step = new Integer(1); |
| 58 | * SpinnerNumberModel model = new SpinnerNumberModel(value, min, max, step); |
| 59 | * int fifty = model.getNumber().intValue(); |
| 60 | * </pre> |
| 61 | * <p> |
| 62 | * Spinners for integers and doubles are common, so special constructors |
| 63 | * for these cases are provided. For example to create the model in |
| 64 | * the previous example, one could also write: |
| 65 | * <pre> |
| 66 | * SpinnerNumberModel model = new SpinnerNumberModel(50, 0, 100, 1); |
| 67 | * </pre> |
| 68 | * <p> |
| 69 | * This model inherits a <code>ChangeListener</code>. |
| 70 | * The <code>ChangeListeners</code> are notified |
| 71 | * whenever the model's <code>value</code>, <code>stepSize</code>, |
| 72 | * <code>minimum</code>, or <code>maximum</code> properties changes. |
| 73 | * |
| 74 | * @see JSpinner |
| 75 | * @see SpinnerModel |
| 76 | * @see AbstractSpinnerModel |
| 77 | * @see SpinnerListModel |
| 78 | * @see SpinnerDateModel |
| 79 | * |
| 80 | * @author Hans Muller |
| 81 | * @since 1.4 |
| 82 | */ |
| 83 | public class SpinnerNumberModel extends AbstractSpinnerModel implements Serializable |
| 84 | { |
| 85 | private Number stepSize, value; |
| 86 | private Comparable minimum, maximum; |
| 87 | |
| 88 | |
| 89 | /** |
| 90 | * Constructs a <code>SpinnerModel</code> that represents |
| 91 | * a closed sequence of |
| 92 | * numbers from <code>minimum</code> to <code>maximum</code>. The |
| 93 | * <code>nextValue</code> and <code>previousValue</code> methods |
| 94 | * compute elements of the sequence by adding or subtracting |
| 95 | * <code>stepSize</code> respectively. All of the parameters |
| 96 | * must be mutually <code>Comparable</code>, <code>value</code> |
| 97 | * and <code>stepSize</code> must be instances of <code>Integer</code> |
| 98 | * <code>Long</code>, <code>Float</code>, or <code>Double</code>. |
| 99 | * <p> |
| 100 | * The <code>minimum</code> and <code>maximum</code> parameters |
| 101 | * can be <code>null</code> to indicate that the range doesn't |
| 102 | * have an upper or lower bound. |
| 103 | * If <code>value</code> or <code>stepSize</code> is <code>null</code>, |
| 104 | * or if both <code>minimum</code> and <code>maximum</code> |
| 105 | * are specified and <code>mininum > maximum</code> then an |
| 106 | * <code>IllegalArgumentException</code> is thrown. |
| 107 | * Similarly if <code>(minimum <= value <= maximum</code>) is false, |
| 108 | * an <code>IllegalArgumentException</code> is thrown. |
| 109 | * |
| 110 | * @param value the current (non <code>null</code>) value of the model |
| 111 | * @param minimum the first number in the sequence or <code>null</code> |
| 112 | * @param maximum the last number in the sequence or <code>null</code> |
| 113 | * @param stepSize the difference between elements of the sequence |
| 114 | * |
| 115 | * @throws IllegalArgumentException if stepSize or value is |
| 116 | * <code>null</code> or if the following expression is false: |
| 117 | * <code>minimum <= value <= maximum</code> |
| 118 | */ |
| 119 | public SpinnerNumberModel(Number value, Comparable minimum, Comparable maximum, Number stepSize) { |
| 120 | if ((value == null) || (stepSize == null)) { |
| 121 | throw new IllegalArgumentException("value and stepSize must be non-null"); |
| 122 | } |
| 123 | if (!(((minimum == null) || (minimum.compareTo(value) <= 0)) && |
| 124 | ((maximum == null) || (maximum.compareTo(value) >= 0)))) { |
| 125 | throw new IllegalArgumentException("(minimum <= value <= maximum) is false"); |
| 126 | } |
| 127 | this.value = value; |
| 128 | this.minimum = minimum; |
| 129 | this.maximum = maximum; |
| 130 | this.stepSize = stepSize; |
| 131 | } |
| 132 | |
| 133 | |
| 134 | /** |
| 135 | * Constructs a <code>SpinnerNumberModel</code> with the specified |
| 136 | * <code>value</code>, <code>minimum</code>/<code>maximum</code> bounds, |
| 137 | * and <code>stepSize</code>. |
| 138 | * |
| 139 | * @param value the current value of the model |
| 140 | * @param minimum the first number in the sequence |
| 141 | * @param maximum the last number in the sequence |
| 142 | * @param stepSize the difference between elements of the sequence |
| 143 | * @throws IllegalArgumentException if the following expression is false: |
| 144 | * <code>minimum <= value <= maximum</code> |
| 145 | */ |
| 146 | public SpinnerNumberModel(int value, int minimum, int maximum, int stepSize) { |
| 147 | this(new Integer(value), new Integer(minimum), new Integer(maximum), new Integer(stepSize)); |
| 148 | } |
| 149 | |
| 150 | |
| 151 | /** |
| 152 | * Constructs a <code>SpinnerNumberModel</code> with the specified |
| 153 | * <code>value</code>, <code>minimum</code>/<code>maximum</code> bounds, |
| 154 | * and <code>stepSize</code>. |
| 155 | * |
| 156 | * @param value the current value of the model |
| 157 | * @param minimum the first number in the sequence |
| 158 | * @param maximum the last number in the sequence |
| 159 | * @param stepSize the difference between elements of the sequence |
| 160 | * @throws IllegalArgumentException if the following expression is false: |
| 161 | * <code>minimum <= value <= maximum</code> |
| 162 | */ |
| 163 | public SpinnerNumberModel(double value, double minimum, double maximum, double stepSize) { |
| 164 | this(new Double(value), new Double(minimum), new Double(maximum), new Double(stepSize)); |
| 165 | } |
| 166 | |
| 167 | |
| 168 | /** |
| 169 | * Constructs a <code>SpinnerNumberModel</code> with no |
| 170 | * <code>minimum</code> or <code>maximum</code> value, |
| 171 | * <code>stepSize</code> equal to one, and an initial value of zero. |
| 172 | */ |
| 173 | public SpinnerNumberModel() { |
| 174 | this(new Integer(0), null, null, new Integer(1)); |
| 175 | } |
| 176 | |
| 177 | |
| 178 | /** |
| 179 | * Changes the lower bound for numbers in this sequence. |
| 180 | * If <code>minimum</code> is <code>null</code>, |
| 181 | * then there is no lower bound. No bounds checking is done here; |
| 182 | * the new <code>minimum</code> value may invalidate the |
| 183 | * <code>(minimum <= value <= maximum)</code> |
| 184 | * invariant enforced by the constructors. This is to simplify updating |
| 185 | * the model, naturally one should ensure that the invariant is true |
| 186 | * before calling the <code>getNextValue</code>, |
| 187 | * <code>getPreviousValue</code>, or <code>setValue</code> methods. |
| 188 | * <p> |
| 189 | * Typically this property is a <code>Number</code> of the same type |
| 190 | * as the <code>value</code> however it's possible to use any |
| 191 | * <code>Comparable</code> with a <code>compareTo</code> |
| 192 | * method for a <code>Number</code> with the same type as the value. |
| 193 | * For example if value was a <code>Long</code>, |
| 194 | * <code>minimum</code> might be a Date subclass defined like this: |
| 195 | * <pre> |
| 196 | * MyDate extends Date { // Date already implements Comparable |
| 197 | * public int compareTo(Long o) { |
| 198 | * long t = getTime(); |
| 199 | * return (t < o.longValue() ? -1 : (t == o.longValue() ? 0 : 1)); |
| 200 | * } |
| 201 | * } |
| 202 | * </pre> |
| 203 | * <p> |
| 204 | * This method fires a <code>ChangeEvent</code> |
| 205 | * if the <code>minimum</code> has changed. |
| 206 | * |
| 207 | * @param minimum a <code>Comparable</code> that has a |
| 208 | * <code>compareTo</code> method for <code>Number</code>s with |
| 209 | * the same type as <code>value</code> |
| 210 | * @see #getMinimum |
| 211 | * @see #setMaximum |
| 212 | * @see SpinnerModel#addChangeListener |
| 213 | */ |
| 214 | public void setMinimum(Comparable minimum) { |
| 215 | if ((minimum == null) ? (this.minimum != null) : !minimum.equals(this.minimum)) { |
| 216 | this.minimum = minimum; |
| 217 | fireStateChanged(); |
| 218 | } |
| 219 | } |
| 220 | |
| 221 | |
| 222 | /** |
| 223 | * Returns the first number in this sequence. |
| 224 | * |
| 225 | * @return the value of the <code>minimum</code> property |
| 226 | * @see #setMinimum |
| 227 | */ |
| 228 | public Comparable getMinimum() { |
| 229 | return minimum; |
| 230 | } |
| 231 | |
| 232 | |
| 233 | /** |
| 234 | * Changes the upper bound for numbers in this sequence. |
| 235 | * If <code>maximum</code> is <code>null</code>, then there |
| 236 | * is no upper bound. No bounds checking is done here; the new |
| 237 | * <code>maximum</code> value may invalidate the |
| 238 | * <code>(minimum <= value < maximum)</code> |
| 239 | * invariant enforced by the constructors. This is to simplify updating |
| 240 | * the model, naturally one should ensure that the invariant is true |
| 241 | * before calling the <code>next</code>, <code>previous</code>, |
| 242 | * or <code>setValue</code> methods. |
| 243 | * <p> |
| 244 | * Typically this property is a <code>Number</code> of the same type |
| 245 | * as the <code>value</code> however it's possible to use any |
| 246 | * <code>Comparable</code> with a <code>compareTo</code> |
| 247 | * method for a <code>Number</code> with the same type as the value. |
| 248 | * See <a href="#setMinimum(java.lang.Comparable)"> |
| 249 | * <code>setMinimum</code></a> for an example. |
| 250 | * <p> |
| 251 | * This method fires a <code>ChangeEvent</code> if the |
| 252 | * <code>maximum</code> has changed. |
| 253 | * |
| 254 | * @param maximum a <code>Comparable</code> that has a |
| 255 | * <code>compareTo</code> method for <code>Number</code>s with |
| 256 | * the same type as <code>value</code> |
| 257 | * @see #getMaximum |
| 258 | * @see #setMinimum |
| 259 | * @see SpinnerModel#addChangeListener |
| 260 | */ |
| 261 | public void setMaximum(Comparable maximum) { |
| 262 | if ((maximum == null) ? (this.maximum != null) : !maximum.equals(this.maximum)) { |
| 263 | this.maximum = maximum; |
| 264 | fireStateChanged(); |
| 265 | } |
| 266 | } |
| 267 | |
| 268 | |
| 269 | /** |
| 270 | * Returns the last number in the sequence. |
| 271 | * |
| 272 | * @return the value of the <code>maximum</code> property |
| 273 | * @see #setMaximum |
| 274 | */ |
| 275 | public Comparable getMaximum() { |
| 276 | return maximum; |
| 277 | } |
| 278 | |
| 279 | |
| 280 | /** |
| 281 | * Changes the size of the value change computed by the |
| 282 | * <code>getNextValue</code> and <code>getPreviousValue</code> |
| 283 | * methods. An <code>IllegalArgumentException</code> |
| 284 | * is thrown if <code>stepSize</code> is <code>null</code>. |
| 285 | * <p> |
| 286 | * This method fires a <code>ChangeEvent</code> if the |
| 287 | * <code>stepSize</code> has changed. |
| 288 | * |
| 289 | * @param stepSize the size of the value change computed by the |
| 290 | * <code>getNextValue</code> and <code>getPreviousValue</code> methods |
| 291 | * @see #getNextValue |
| 292 | * @see #getPreviousValue |
| 293 | * @see #getStepSize |
| 294 | * @see SpinnerModel#addChangeListener |
| 295 | */ |
| 296 | public void setStepSize(Number stepSize) { |
| 297 | if (stepSize == null) { |
| 298 | throw new IllegalArgumentException("null stepSize"); |
| 299 | } |
| 300 | if (!stepSize.equals(this.stepSize)) { |
| 301 | this.stepSize = stepSize; |
| 302 | fireStateChanged(); |
| 303 | } |
| 304 | } |
| 305 | |
| 306 | |
| 307 | /** |
| 308 | * Returns the size of the value change computed by the |
| 309 | * <code>getNextValue</code> |
| 310 | * and <code>getPreviousValue</code> methods. |
| 311 | * |
| 312 | * @return the value of the <code>stepSize</code> property |
| 313 | * @see #setStepSize |
| 314 | */ |
| 315 | public Number getStepSize() { |
| 316 | return stepSize; |
| 317 | } |
| 318 | |
| 319 | |
| 320 | private Number incrValue(int dir) |
| 321 | { |
| 322 | Number newValue; |
| 323 | if ((value instanceof Float) || (value instanceof Double)) { |
| 324 | double v = value.doubleValue() + (stepSize.doubleValue() * (double)dir); |
| 325 | if (value instanceof Double) { |
| 326 | newValue = new Double(v); |
| 327 | } |
| 328 | else { |
| 329 | newValue = new Float(v); |
| 330 | } |
| 331 | } |
| 332 | else { |
| 333 | long v = value.longValue() + (stepSize.longValue() * (long)dir); |
| 334 | |
| 335 | if (value instanceof Long) { |
| 336 | newValue = new Long(v); |
| 337 | } |
| 338 | else if (value instanceof Integer) { |
| 339 | newValue = new Integer((int)v); |
| 340 | } |
| 341 | else if (value instanceof Short) { |
| 342 | newValue = new Short((short)v); |
| 343 | } |
| 344 | else { |
| 345 | newValue = new Byte((byte)v); |
| 346 | } |
| 347 | } |
| 348 | |
| 349 | if ((maximum != null) && (maximum.compareTo(newValue) < 0)) { |
| 350 | return null; |
| 351 | } |
| 352 | if ((minimum != null) && (minimum.compareTo(newValue) > 0)) { |
| 353 | return null; |
| 354 | } |
| 355 | else { |
| 356 | return newValue; |
| 357 | } |
| 358 | } |
| 359 | |
| 360 | |
| 361 | /** |
| 362 | * Returns the next number in the sequence. |
| 363 | * |
| 364 | * @return <code>value + stepSize</code> or <code>null</code> if the sum |
| 365 | * exceeds <code>maximum</code>. |
| 366 | * |
| 367 | * @see SpinnerModel#getNextValue |
| 368 | * @see #getPreviousValue |
| 369 | * @see #setStepSize |
| 370 | */ |
| 371 | public Object getNextValue() { |
| 372 | return incrValue(+1); |
| 373 | } |
| 374 | |
| 375 | |
| 376 | /** |
| 377 | * Returns the previous number in the sequence. |
| 378 | * |
| 379 | * @return <code>value - stepSize</code>, or |
| 380 | * <code>null</code> if the sum is less |
| 381 | * than <code>minimum</code>. |
| 382 | * |
| 383 | * @see SpinnerModel#getPreviousValue |
| 384 | * @see #getNextValue |
| 385 | * @see #setStepSize |
| 386 | */ |
| 387 | public Object getPreviousValue() { |
| 388 | return incrValue(-1); |
| 389 | } |
| 390 | |
| 391 | |
| 392 | /** |
| 393 | * Returns the value of the current element of the sequence. |
| 394 | * |
| 395 | * @return the value property |
| 396 | * @see #setValue |
| 397 | */ |
| 398 | public Number getNumber() { |
| 399 | return value; |
| 400 | } |
| 401 | |
| 402 | |
| 403 | /** |
| 404 | * Returns the value of the current element of the sequence. |
| 405 | * |
| 406 | * @return the value property |
| 407 | * @see #setValue |
| 408 | * @see #getNumber |
| 409 | */ |
| 410 | public Object getValue() { |
| 411 | return value; |
| 412 | } |
| 413 | |
| 414 | |
| 415 | /** |
| 416 | * Sets the current value for this sequence. If <code>value</code> is |
| 417 | * <code>null</code>, or not a <code>Number</code>, an |
| 418 | * <code>IllegalArgumentException</code> is thrown. No |
| 419 | * bounds checking is done here; the new value may invalidate the |
| 420 | * <code>(minimum <= value <= maximum)</code> |
| 421 | * invariant enforced by the constructors. It's also possible to set |
| 422 | * the value to be something that wouldn't naturally occur in the sequence, |
| 423 | * i.e. a value that's not modulo the <code>stepSize</code>. |
| 424 | * This is to simplify updating the model, and to accommodate |
| 425 | * spinners that don't want to restrict values that have been |
| 426 | * directly entered by the user. Naturally, one should ensure that the |
| 427 | * <code>(minimum <= value <= maximum)</code> invariant is true |
| 428 | * before calling the <code>next</code>, <code>previous</code>, or |
| 429 | * <code>setValue</code> methods. |
| 430 | * <p> |
| 431 | * This method fires a <code>ChangeEvent</code> if the value has changed. |
| 432 | * |
| 433 | * @param value the current (non <code>null</code>) <code>Number</code> |
| 434 | * for this sequence |
| 435 | * @throws IllegalArgumentException if <code>value</code> is |
| 436 | * <code>null</code> or not a <code>Number</code> |
| 437 | * @see #getNumber |
| 438 | * @see #getValue |
| 439 | * @see SpinnerModel#addChangeListener |
| 440 | */ |
| 441 | public void setValue(Object value) { |
| 442 | if ((value == null) || !(value instanceof Number)) { |
| 443 | throw new IllegalArgumentException("illegal value"); |
| 444 | } |
| 445 | if (!value.equals(this.value)) { |
| 446 | this.value = (Number)value; |
| 447 | fireStateChanged(); |
| 448 | } |
| 449 | } |
| 450 | } |