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| 1 | /* | ||
| 2 | * Copyright (c) 1996, 2006, Oracle and/or its affiliates. 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. Oracle designates this | ||
| 8 | * particular file as subject to the "Classpath" exception as provided | ||
| 9 | * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | ||
| 22 | * or visit www.oracle.com if you need additional information or have any | ||
| 23 | * questions. | ||
| 24 | */ | ||
| 25 | package java.awt; | ||
| 26 | |||
| 27 | import java.awt.event.*; | ||
| 28 | import java.lang.reflect.Array; | ||
| 29 | import java.util.EventListener; | ||
| 30 | import java.io.Serializable; | ||
| 31 | import java.io.ObjectOutputStream; | ||
| 32 | import java.io.IOException; | ||
| 33 | import java.util.EventListener; | ||
| 34 | |||
| 35 | |||
| 36 | /** | ||
| 37 | * {@code AWTEventMulticaster} implements efficient and thread-safe multi-cast | ||
| 38 | * event dispatching for the AWT events defined in the {@code java.awt.event} | ||
| 39 | * package. | ||
| 40 | * <p> | ||
| 41 | * The following example illustrates how to use this class: | ||
| 42 | * | ||
| 43 | * <pre><code> | ||
| 44 | * public myComponent extends Component { | ||
| 45 | * ActionListener actionListener = null; | ||
| 46 | * | ||
| 47 | * public synchronized void addActionListener(ActionListener l) { | ||
| 48 | * actionListener = AWTEventMulticaster.add(actionListener, l); | ||
| 49 | * } | ||
| 50 | * public synchronized void removeActionListener(ActionListener l) { | ||
| 51 | * actionListener = AWTEventMulticaster.remove(actionListener, l); | ||
| 52 | * } | ||
| 53 | * public void processEvent(AWTEvent e) { | ||
| 54 | * // when event occurs which causes "action" semantic | ||
| 55 | * ActionListener listener = actionListener; | ||
| 56 | * if (listener != null) { | ||
| 57 | * listener.actionPerformed(new ActionEvent()); | ||
| 58 | * } | ||
| 59 | * } | ||
| 60 | * } | ||
| 61 | * </code></pre> | ||
| 62 | * The important point to note is the first argument to the {@code | ||
| 63 | * add} and {@code remove} methods is the field maintaining the | ||
| 64 | * listeners. In addition you must assign the result of the {@code add} | ||
| 65 | * and {@code remove} methods to the field maintaining the listeners. | ||
| 66 | * <p> | ||
| 67 | * {@code AWTEventMulticaster} is implemented as a pair of {@code | ||
| 68 | * EventListeners} that are set at construction time. {@code | ||
| 69 | * AWTEventMulticaster} is immutable. The {@code add} and {@code | ||
| 70 | * remove} methods do not alter {@code AWTEventMulticaster} in | ||
| 71 | * anyway. If necessary, a new {@code AWTEventMulticaster} is | ||
| 72 | * created. In this way it is safe to add and remove listeners during | ||
| 73 | * the process of an event dispatching. However, event listeners | ||
| 74 | * added during the process of an event dispatch operation are not | ||
| 75 | * notified of the event currently being dispatched. | ||
| 76 | * <p> | ||
| 77 | * All of the {@code add} methods allow {@code null} arguments. If the | ||
| 78 | * first argument is {@code null}, the second argument is returned. If | ||
| 79 | * the first argument is not {@code null} and the second argument is | ||
| 80 | * {@code null}, the first argument is returned. If both arguments are | ||
| 81 | * {@code non-null}, a new {@code AWTEventMulticaster} is created using | ||
| 82 | * the two arguments and returned. | ||
| 83 | * <p> | ||
| 84 | * For the {@code remove} methods that take two arguments, the following is | ||
| 85 | * returned: | ||
| 86 | * <ul> | ||
| 87 | * <li>{@code null}, if the first argument is {@code null}, or | ||
| 88 | * the arguments are equal, by way of {@code ==}. | ||
| 89 | * <li>the first argument, if the first argument is not an instance of | ||
| 90 | * {@code AWTEventMulticaster}. | ||
| 91 | * <li>result of invoking {@code remove(EventListener)} on the | ||
| 92 | * first argument, supplying the second argument to the | ||
| 93 | * {@code remove(EventListener)} method. | ||
| 94 | * </ul> | ||
| 95 | * <p>Swing makes use of | ||
| 96 | * {@link javax.swing.event.EventListenerList EventListenerList} for | ||
| 97 | * similar logic. Refer to it for details. | ||
| 98 | * | ||
| 99 | * @see javax.swing.event.EventListenerList | ||
| 100 | * | ||
| 101 | * @author John Rose | ||
| 102 | * @author Amy Fowler | ||
| 103 | * @since 1.1 | ||
| 104 | */ | ||
| 105 | |||
| 106 | public class AWTEventMulticaster implements | ||
| 107 | ComponentListener, ContainerListener, FocusListener, KeyListener, | ||
| 108 | MouseListener, MouseMotionListener, WindowListener, WindowFocusListener, | ||
| 109 | WindowStateListener, ActionListener, ItemListener, AdjustmentListener, | ||
| 110 | TextListener, InputMethodListener, HierarchyListener, | ||
| 111 | HierarchyBoundsListener, MouseWheelListener { | ||
| 112 | |||
| 113 | protected final EventListener a, b; | ||
| 114 | |||
| 115 | /** | ||
| 116 | * Creates an event multicaster instance which chains listener-a | ||
| 117 | * with listener-b. Input parameters <code>a</code> and <code>b</code> | ||
| 118 | * should not be <code>null</code>, though implementations may vary in | ||
| 119 | * choosing whether or not to throw <code>NullPointerException</code> | ||
| 120 | * in that case. | ||
| 121 | * @param a listener-a | ||
| 122 | * @param b listener-b | ||
| 123 | */ | ||
| 124 | protected AWTEventMulticaster(EventListener a, EventListener b) { | ||
| 125 | this.a = a; this.b = b; | ||
| 126 | } | ||
| 127 | |||
| 128 | /** | ||
| 129 | * Removes a listener from this multicaster. | ||
| 130 | * <p> | ||
| 131 | * The returned multicaster contains all the listeners in this | ||
| 132 | * multicaster with the exception of all occurrences of {@code oldl}. | ||
| 133 | * If the resulting multicaster contains only one regular listener | ||
| 134 | * the regular listener may be returned. If the resulting multicaster | ||
| 135 | * is empty, then {@code null} may be returned instead. | ||
| 136 | * <p> | ||
| 137 | * No exception is thrown if {@code oldl} is {@code null}. | ||
| 138 | * | ||
| 139 | * @param oldl the listener to be removed | ||
| 140 | * @return resulting listener | ||
| 141 | */ | ||
| 142 | protected EventListener remove(EventListener oldl) { | ||
| 143 | if (oldl == a) return b; | ||
| 144 | if (oldl == b) return a; | ||
| 145 | EventListener a2 = removeInternal(a, oldl); | ||
| 146 | EventListener b2 = removeInternal(b, oldl); | ||
| 147 | if (a2 == a && b2 == b) { | ||
| 148 | return this; // it's not here | ||
| 149 | } | ||
| 150 | return addInternal(a2, b2); | ||
| 151 | } | ||
| 152 | |||
| 153 | /** | ||
| 154 | * Handles the componentResized event by invoking the | ||
| 155 | * componentResized methods on listener-a and listener-b. | ||
| 156 | * @param e the component event | ||
| 157 | */ | ||
| 158 | public void componentResized(ComponentEvent e) { | ||
| 159 | ((ComponentListener)a).componentResized(e); | ||
| 160 | ((ComponentListener)b).componentResized(e); | ||
| 161 | } | ||
| 162 | |||
| 163 | /** | ||
| 164 | * Handles the componentMoved event by invoking the | ||
| 165 | * componentMoved methods on listener-a and listener-b. | ||
| 166 | * @param e the component event | ||
| 167 | */ | ||
| 168 | public void componentMoved(ComponentEvent e) { | ||
| 169 | ((ComponentListener)a).componentMoved(e); | ||
| 170 | ((ComponentListener)b).componentMoved(e); | ||
| 171 | } | ||
| 172 | |||
| 173 | /** | ||
| 174 | * Handles the componentShown event by invoking the | ||
| 175 | * componentShown methods on listener-a and listener-b. | ||
| 176 | * @param e the component event | ||
| 177 | */ | ||
| 178 | public void componentShown(ComponentEvent e) { | ||
| 179 | ((ComponentListener)a).componentShown(e); | ||
| 180 | ((ComponentListener)b).componentShown(e); | ||
| 181 | } | ||
| 182 | |||
| 183 | /** | ||
| 184 | * Handles the componentHidden event by invoking the | ||
| 185 | * componentHidden methods on listener-a and listener-b. | ||
| 186 | * @param e the component event | ||
| 187 | */ | ||
| 188 | public void componentHidden(ComponentEvent e) { | ||
| 189 | ((ComponentListener)a).componentHidden(e); | ||
| 190 | ((ComponentListener)b).componentHidden(e); | ||
| 191 | } | ||
| 192 | |||
| 193 | /** | ||
| 194 | * Handles the componentAdded container event by invoking the | ||
| 195 | * componentAdded methods on listener-a and listener-b. | ||
| 196 | * @param e the component event | ||
| 197 | */ | ||
| 198 | public void componentAdded(ContainerEvent e) { | ||
| 199 | ((ContainerListener)a).componentAdded(e); | ||
| 200 | ((ContainerListener)b).componentAdded(e); | ||
| 201 | } | ||
| 202 | |||
| 203 | /** | ||
| 204 | * Handles the componentRemoved container event by invoking the | ||
| 205 | * componentRemoved methods on listener-a and listener-b. | ||
| 206 | * @param e the component event | ||
| 207 | */ | ||
| 208 | public void componentRemoved(ContainerEvent e) { | ||
| 209 | ((ContainerListener)a).componentRemoved(e); | ||
| 210 | ((ContainerListener)b).componentRemoved(e); | ||
| 211 | } | ||
| 212 | |||
| 213 | /** | ||
| 214 | * Handles the focusGained event by invoking the | ||
| 215 | * focusGained methods on listener-a and listener-b. | ||
| 216 | * @param e the focus event | ||
| 217 | */ | ||
| 218 | public void focusGained(FocusEvent e) { | ||
| 219 | ((FocusListener)a).focusGained(e); | ||
| 220 | ((FocusListener)b).focusGained(e); | ||
| 221 | } | ||
| 222 | |||
| 223 | /** | ||
| 224 | * Handles the focusLost event by invoking the | ||
| 225 | * focusLost methods on listener-a and listener-b. | ||
| 226 | * @param e the focus event | ||
| 227 | */ | ||
| 228 | public void focusLost(FocusEvent e) { | ||
| 229 | ((FocusListener)a).focusLost(e); | ||
| 230 | ((FocusListener)b).focusLost(e); | ||
| 231 | } | ||
| 232 | |||
| 233 | /** | ||
| 234 | * Handles the keyTyped event by invoking the | ||
| 235 | * keyTyped methods on listener-a and listener-b. | ||
| 236 | * @param e the key event | ||
| 237 | */ | ||
| 238 | public void keyTyped(KeyEvent e) { | ||
| 239 | ((KeyListener)a).keyTyped(e); | ||
| 240 | ((KeyListener)b).keyTyped(e); | ||
| 241 | } | ||
| 242 | |||
| 243 | /** | ||
| 244 | * Handles the keyPressed event by invoking the | ||
| 245 | * keyPressed methods on listener-a and listener-b. | ||
| 246 | * @param e the key event | ||
| 247 | */ | ||
| 248 | public void keyPressed(KeyEvent e) { | ||
| 249 | ((KeyListener)a).keyPressed(e); | ||
| 250 | ((KeyListener)b).keyPressed(e); | ||
| 251 | } | ||
| 252 | |||
| 253 | /** | ||
| 254 | * Handles the keyReleased event by invoking the | ||
| 255 | * keyReleased methods on listener-a and listener-b. | ||
| 256 | * @param e the key event | ||
| 257 | */ | ||
| 258 | public void keyReleased(KeyEvent e) { | ||
| 259 | ((KeyListener)a).keyReleased(e); | ||
| 260 | ((KeyListener)b).keyReleased(e); | ||
| 261 | } | ||
| 262 | |||
| 263 | /** | ||
| 264 | * Handles the mouseClicked event by invoking the | ||
| 265 | * mouseClicked methods on listener-a and listener-b. | ||
| 266 | * @param e the mouse event | ||
| 267 | */ | ||
| 268 | public void mouseClicked(MouseEvent e) { | ||
| 269 | ((MouseListener)a).mouseClicked(e); | ||
| 270 | ((MouseListener)b).mouseClicked(e); | ||
| 271 | } | ||
| 272 | |||
| 273 | /** | ||
| 274 | * Handles the mousePressed event by invoking the | ||
| 275 | * mousePressed methods on listener-a and listener-b. | ||
| 276 | * @param e the mouse event | ||
| 277 | */ | ||
| 278 | public void mousePressed(MouseEvent e) { | ||
| 279 | ((MouseListener)a).mousePressed(e); | ||
| 280 | ((MouseListener)b).mousePressed(e); | ||
| 281 | } | ||
| 282 | |||
| 283 | /** | ||
| 284 | * Handles the mouseReleased event by invoking the | ||
| 285 | * mouseReleased methods on listener-a and listener-b. | ||
| 286 | * @param e the mouse event | ||
| 287 | */ | ||
| 288 | public void mouseReleased(MouseEvent e) { | ||
| 289 | ((MouseListener)a).mouseReleased(e); | ||
| 290 | ((MouseListener)b).mouseReleased(e); | ||
| 291 | } | ||
| 292 | |||
| 293 | /** | ||
| 294 | * Handles the mouseEntered event by invoking the | ||
| 295 | * mouseEntered methods on listener-a and listener-b. | ||
| 296 | * @param e the mouse event | ||
| 297 | */ | ||
| 298 | public void mouseEntered(MouseEvent e) { | ||
| 299 | ((MouseListener)a).mouseEntered(e); | ||
| 300 | ((MouseListener)b).mouseEntered(e); | ||
| 301 | } | ||
| 302 | |||
| 303 | /** | ||
| 304 | * Handles the mouseExited event by invoking the | ||
| 305 | * mouseExited methods on listener-a and listener-b. | ||
| 306 | * @param e the mouse event | ||
| 307 | */ | ||
| 308 | public void mouseExited(MouseEvent e) { | ||
| 309 | ((MouseListener)a).mouseExited(e); | ||
| 310 | ((MouseListener)b).mouseExited(e); | ||
| 311 | } | ||
| 312 | |||
| 313 | /** | ||
| 314 | * Handles the mouseDragged event by invoking the | ||
| 315 | * mouseDragged methods on listener-a and listener-b. | ||
| 316 | * @param e the mouse event | ||
| 317 | */ | ||
| 318 | public void mouseDragged(MouseEvent e) { | ||
| 319 | ((MouseMotionListener)a).mouseDragged(e); | ||
| 320 | ((MouseMotionListener)b).mouseDragged(e); | ||
| 321 | } | ||
| 322 | |||
| 323 | /** | ||
| 324 | * Handles the mouseMoved event by invoking the | ||
| 325 | * mouseMoved methods on listener-a and listener-b. | ||
| 326 | * @param e the mouse event | ||
| 327 | */ | ||
| 328 | public void mouseMoved(MouseEvent e) { | ||
| 329 | ((MouseMotionListener)a).mouseMoved(e); | ||
| 330 | ((MouseMotionListener)b).mouseMoved(e); | ||
| 331 | } | ||
| 332 | |||
| 333 | /** | ||
| 334 | * Handles the windowOpened event by invoking the | ||
| 335 | * windowOpened methods on listener-a and listener-b. | ||
| 336 | * @param e the window event | ||
| 337 | */ | ||
| 338 | public void windowOpened(WindowEvent e) { | ||
| 339 | ((WindowListener)a).windowOpened(e); | ||
| 340 | ((WindowListener)b).windowOpened(e); | ||
| 341 | } | ||
| 342 | |||
| 343 | /** | ||
| 344 | * Handles the windowClosing event by invoking the | ||
| 345 | * windowClosing methods on listener-a and listener-b. | ||
| 346 | * @param e the window event | ||
| 347 | */ | ||
| 348 | public void windowClosing(WindowEvent e) { | ||
| 349 | ((WindowListener)a).windowClosing(e); | ||
| 350 | ((WindowListener)b).windowClosing(e); | ||
| 351 | } | ||
| 352 | |||
| 353 | /** | ||
| 354 | * Handles the windowClosed event by invoking the | ||
| 355 | * windowClosed methods on listener-a and listener-b. | ||
| 356 | * @param e the window event | ||
| 357 | */ | ||
| 358 | public void windowClosed(WindowEvent e) { | ||
| 359 | ((WindowListener)a).windowClosed(e); | ||
| 360 | ((WindowListener)b).windowClosed(e); | ||
| 361 | } | ||
| 362 | |||
| 363 | /** | ||
| 364 | * Handles the windowIconified event by invoking the | ||
| 365 | * windowIconified methods on listener-a and listener-b. | ||
| 366 | * @param e the window event | ||
| 367 | */ | ||
| 368 | public void windowIconified(WindowEvent e) { | ||
| 369 | ((WindowListener)a).windowIconified(e); | ||
| 370 | ((WindowListener)b).windowIconified(e); | ||
| 371 | } | ||
| 372 | |||
| 373 | /** | ||
| 374 | * Handles the windowDeiconfied event by invoking the | ||
| 375 | * windowDeiconified methods on listener-a and listener-b. | ||
| 376 | * @param e the window event | ||
| 377 | */ | ||
| 378 | public void windowDeiconified(WindowEvent e) { | ||
| 379 | ((WindowListener)a).windowDeiconified(e); | ||
| 380 | ((WindowListener)b).windowDeiconified(e); | ||
| 381 | } | ||
| 382 | |||
| 383 | /** | ||
| 384 | * Handles the windowActivated event by invoking the | ||
| 385 | * windowActivated methods on listener-a and listener-b. | ||
| 386 | * @param e the window event | ||
| 387 | */ | ||
| 388 | public void windowActivated(WindowEvent e) { | ||
| 389 | ((WindowListener)a).windowActivated(e); | ||
| 390 | ((WindowListener)b).windowActivated(e); | ||
| 391 | } | ||
| 392 | |||
| 393 | /** | ||
| 394 | * Handles the windowDeactivated event by invoking the | ||
| 395 | * windowDeactivated methods on listener-a and listener-b. | ||
| 396 | * @param e the window event | ||
| 397 | */ | ||
| 398 | public void windowDeactivated(WindowEvent e) { | ||
| 399 | ((WindowListener)a).windowDeactivated(e); | ||
| 400 | ((WindowListener)b).windowDeactivated(e); | ||
| 401 | } | ||
| 402 | |||
| 403 | /** | ||
| 404 | * Handles the windowStateChanged event by invoking the | ||
| 405 | * windowStateChanged methods on listener-a and listener-b. | ||
| 406 | * @param e the window event | ||
| 407 | * @since 1.4 | ||
| 408 | */ | ||
| 409 | public void windowStateChanged(WindowEvent e) { | ||
| 410 | ((WindowStateListener)a).windowStateChanged(e); | ||
| 411 | ((WindowStateListener)b).windowStateChanged(e); | ||
| 412 | } | ||
| 413 | |||
| 414 | |||
| 415 | /** | ||
| 416 | * Handles the windowGainedFocus event by invoking the windowGainedFocus | ||
| 417 | * methods on listener-a and listener-b. | ||
| 418 | * @param e the window event | ||
| 419 | * @since 1.4 | ||
| 420 | */ | ||
| 421 | public void windowGainedFocus(WindowEvent e) { | ||
| 422 | ((WindowFocusListener)a).windowGainedFocus(e); | ||
| 423 | ((WindowFocusListener)b).windowGainedFocus(e); | ||
| 424 | } | ||
| 425 | |||
| 426 | /** | ||
| 427 | * Handles the windowLostFocus event by invoking the windowLostFocus | ||
| 428 | * methods on listener-a and listener-b. | ||
| 429 | * @param e the window event | ||
| 430 | * @since 1.4 | ||
| 431 | */ | ||
| 432 | public void windowLostFocus(WindowEvent e) { | ||
| 433 | ((WindowFocusListener)a).windowLostFocus(e); | ||
| 434 | ((WindowFocusListener)b).windowLostFocus(e); | ||
| 435 | } | ||
| 436 | |||
| 437 | /** | ||
| 438 | * Handles the actionPerformed event by invoking the | ||
| 439 | * actionPerformed methods on listener-a and listener-b. | ||
| 440 | * @param e the action event | ||
| 441 | */ | ||
| 442 | public void actionPerformed(ActionEvent e) { | ||
| 443 | ((ActionListener)a).actionPerformed(e); | ||
| 444 | ((ActionListener)b).actionPerformed(e); | ||
| 445 | } | ||
| 446 | |||
| 447 | /** | ||
| 448 | * Handles the itemStateChanged event by invoking the | ||
| 449 | * itemStateChanged methods on listener-a and listener-b. | ||
| 450 | * @param e the item event | ||
| 451 | */ | ||
| 452 | public void itemStateChanged(ItemEvent e) { | ||
| 453 | ((ItemListener)a).itemStateChanged(e); | ||
| 454 | ((ItemListener)b).itemStateChanged(e); | ||
| 455 | } | ||
| 456 | |||
| 457 | /** | ||
| 458 | * Handles the adjustmentValueChanged event by invoking the | ||
| 459 | * adjustmentValueChanged methods on listener-a and listener-b. | ||
| 460 | * @param e the adjustment event | ||
| 461 | */ | ||
| 462 | public void adjustmentValueChanged(AdjustmentEvent e) { | ||
| 463 | ((AdjustmentListener)a).adjustmentValueChanged(e); | ||
| 464 | ((AdjustmentListener)b).adjustmentValueChanged(e); | ||
| 465 | } | ||
| 466 | public void textValueChanged(TextEvent e) { | ||
| 467 | ((TextListener)a).textValueChanged(e); | ||
| 468 | ((TextListener)b).textValueChanged(e); | ||
| 469 | } | ||
| 470 | |||
| 471 | /** | ||
| 472 | * Handles the inputMethodTextChanged event by invoking the | ||
| 473 | * inputMethodTextChanged methods on listener-a and listener-b. | ||
| 474 | * @param e the item event | ||
| 475 | */ | ||
| 476 | public void inputMethodTextChanged(InputMethodEvent e) { | ||
| 477 | ((InputMethodListener)a).inputMethodTextChanged(e); | ||
| 478 | ((InputMethodListener)b).inputMethodTextChanged(e); | ||
| 479 | } | ||
| 480 | |||
| 481 | /** | ||
| 482 | * Handles the caretPositionChanged event by invoking the | ||
| 483 | * caretPositionChanged methods on listener-a and listener-b. | ||
| 484 | * @param e the item event | ||
| 485 | */ | ||
| 486 | public void caretPositionChanged(InputMethodEvent e) { | ||
| 487 | ((InputMethodListener)a).caretPositionChanged(e); | ||
| 488 | ((InputMethodListener)b).caretPositionChanged(e); | ||
| 489 | } | ||
| 490 | |||
| 491 | /** | ||
| 492 | * Handles the hierarchyChanged event by invoking the | ||
| 493 | * hierarchyChanged methods on listener-a and listener-b. | ||
| 494 | * @param e the item event | ||
| 495 | * @since 1.3 | ||
| 496 | */ | ||
| 497 | public void hierarchyChanged(HierarchyEvent e) { | ||
| 498 | ((HierarchyListener)a).hierarchyChanged(e); | ||
| 499 | ((HierarchyListener)b).hierarchyChanged(e); | ||
| 500 | } | ||
| 501 | |||
| 502 | /** | ||
| 503 | * Handles the ancestorMoved event by invoking the | ||
| 504 | * ancestorMoved methods on listener-a and listener-b. | ||
| 505 | * @param e the item event | ||
| 506 | * @since 1.3 | ||
| 507 | */ | ||
| 508 | public void ancestorMoved(HierarchyEvent e) { | ||
| 509 | ((HierarchyBoundsListener)a).ancestorMoved(e); | ||
| 510 | ((HierarchyBoundsListener)b).ancestorMoved(e); | ||
| 511 | } | ||
| 512 | |||
| 513 | /** | ||
| 514 | * Handles the ancestorResized event by invoking the | ||
| 515 | * ancestorResized methods on listener-a and listener-b. | ||
| 516 | * @param e the item event | ||
| 517 | * @since 1.3 | ||
| 518 | */ | ||
| 519 | public void ancestorResized(HierarchyEvent e) { | ||
| 520 | ((HierarchyBoundsListener)a).ancestorResized(e); | ||
| 521 | ((HierarchyBoundsListener)b).ancestorResized(e); | ||
| 522 | } | ||
| 523 | |||
| 524 | /** | ||
| 525 | * Handles the mouseWheelMoved event by invoking the | ||
| 526 | * mouseWheelMoved methods on listener-a and listener-b. | ||
| 527 | * @param e the mouse event | ||
| 528 | * @since 1.4 | ||
| 529 | */ | ||
| 530 | public void mouseWheelMoved(MouseWheelEvent e) { | ||
| 531 | ((MouseWheelListener)a).mouseWheelMoved(e); | ||
| 532 | ((MouseWheelListener)b).mouseWheelMoved(e); | ||
| 533 | } | ||
| 534 | |||
| 535 | /** | ||
| 536 | * Adds component-listener-a with component-listener-b and | ||
| 537 | * returns the resulting multicast listener. | ||
| 538 | * @param a component-listener-a | ||
| 539 | * @param b component-listener-b | ||
| 540 | */ | ||
| 541 | public static ComponentListener add(ComponentListener a, ComponentListener b) { | ||
| 542 | return (ComponentListener)addInternal(a, b); | ||
| 543 | } | ||
| 544 | |||
| 545 | /** | ||
| 546 | * Adds container-listener-a with container-listener-b and | ||
| 547 | * returns the resulting multicast listener. | ||
| 548 | * @param a container-listener-a | ||
| 549 | * @param b container-listener-b | ||
| 550 | */ | ||
| 551 | public static ContainerListener add(ContainerListener a, ContainerListener b) { | ||
| 552 | return (ContainerListener)addInternal(a, b); | ||
| 553 | } | ||
| 554 | |||
| 555 | /** | ||
| 556 | * Adds focus-listener-a with focus-listener-b and | ||
| 557 | * returns the resulting multicast listener. | ||
| 558 | * @param a focus-listener-a | ||
| 559 | * @param b focus-listener-b | ||
| 560 | */ | ||
| 561 | public static FocusListener add(FocusListener a, FocusListener b) { | ||
| 562 | return (FocusListener)addInternal(a, b); | ||
| 563 | } | ||
| 564 | |||
| 565 | /** | ||
| 566 | * Adds key-listener-a with key-listener-b and | ||
| 567 | * returns the resulting multicast listener. | ||
| 568 | * @param a key-listener-a | ||
| 569 | * @param b key-listener-b | ||
| 570 | */ | ||
| 571 | public static KeyListener add(KeyListener a, KeyListener b) { | ||
| 572 | return (KeyListener)addInternal(a, b); | ||
| 573 | } | ||
| 574 | |||
| 575 | /** | ||
| 576 | * Adds mouse-listener-a with mouse-listener-b and | ||
| 577 | * returns the resulting multicast listener. | ||
| 578 | * @param a mouse-listener-a | ||
| 579 | * @param b mouse-listener-b | ||
| 580 | */ | ||
| 581 | public static MouseListener add(MouseListener a, MouseListener b) { | ||
| 582 | return (MouseListener)addInternal(a, b); | ||
| 583 | } | ||
| 584 | |||
| 585 | /** | ||
| 586 | * Adds mouse-motion-listener-a with mouse-motion-listener-b and | ||
| 587 | * returns the resulting multicast listener. | ||
| 588 | * @param a mouse-motion-listener-a | ||
| 589 | * @param b mouse-motion-listener-b | ||
| 590 | */ | ||
| 591 | public static MouseMotionListener add(MouseMotionListener a, MouseMotionListener b) { | ||
| 592 | return (MouseMotionListener)addInternal(a, b); | ||
| 593 | } | ||
| 594 | |||
| 595 | /** | ||
| 596 | * Adds window-listener-a with window-listener-b and | ||
| 597 | * returns the resulting multicast listener. | ||
| 598 | * @param a window-listener-a | ||
| 599 | * @param b window-listener-b | ||
| 600 | */ | ||
| 601 | public static WindowListener add(WindowListener a, WindowListener b) { | ||
| 602 | return (WindowListener)addInternal(a, b); | ||
| 603 | } | ||
| 604 | |||
| 605 | /** | ||
| 606 | * Adds window-state-listener-a with window-state-listener-b | ||
| 607 | * and returns the resulting multicast listener. | ||
| 608 | * @param a window-state-listener-a | ||
| 609 | * @param b window-state-listener-b | ||
| 610 | * @since 1.4 | ||
| 611 | */ | ||
| 612 | public static WindowStateListener add(WindowStateListener a, | ||
| 613 | WindowStateListener b) { | ||
| 614 | return (WindowStateListener)addInternal(a, b); | ||
| 615 | } | ||
| 616 | |||
| 617 | /** | ||
| 618 | * Adds window-focus-listener-a with window-focus-listener-b | ||
| 619 | * and returns the resulting multicast listener. | ||
| 620 | * @param a window-focus-listener-a | ||
| 621 | * @param b window-focus-listener-b | ||
| 622 | * @since 1.4 | ||
| 623 | */ | ||
| 624 | public static WindowFocusListener add(WindowFocusListener a, | ||
| 625 | WindowFocusListener b) { | ||
| 626 | return (WindowFocusListener)addInternal(a, b); | ||
| 627 | } | ||
| 628 | |||
| 629 | /** | ||
| 630 | * Adds action-listener-a with action-listener-b and | ||
| 631 | * returns the resulting multicast listener. | ||
| 632 | * @param a action-listener-a | ||
| 633 | * @param b action-listener-b | ||
| 634 | */ | ||
| 635 | public static ActionListener add(ActionListener a, ActionListener b) { | ||
| 636 | return (ActionListener)addInternal(a, b); | ||
| 637 | } | ||
| 638 | |||
| 639 | /** | ||
| 640 | * Adds item-listener-a with item-listener-b and | ||
| 641 | * returns the resulting multicast listener. | ||
| 642 | * @param a item-listener-a | ||
| 643 | * @param b item-listener-b | ||
| 644 | */ | ||
| 645 | public static ItemListener add(ItemListener a, ItemListener b) { | ||
| 646 | return (ItemListener)addInternal(a, b); | ||
| 647 | } | ||
| 648 | |||
| 649 | /** | ||
| 650 | * Adds adjustment-listener-a with adjustment-listener-b and | ||
| 651 | * returns the resulting multicast listener. | ||
| 652 | * @param a adjustment-listener-a | ||
| 653 | * @param b adjustment-listener-b | ||
| 654 | */ | ||
| 655 | public static AdjustmentListener add(AdjustmentListener a, AdjustmentListener b) { | ||
| 656 | return (AdjustmentListener)addInternal(a, b); | ||
| 657 | } | ||
| 658 | public static TextListener add(TextListener a, TextListener b) { | ||
| 659 | return (TextListener)addInternal(a, b); | ||
| 660 | } | ||
| 661 | |||
| 662 | /** | ||
| 663 | * Adds input-method-listener-a with input-method-listener-b and | ||
| 664 | * returns the resulting multicast listener. | ||
| 665 | * @param a input-method-listener-a | ||
| 666 | * @param b input-method-listener-b | ||
| 667 | */ | ||
| 668 | public static InputMethodListener add(InputMethodListener a, InputMethodListener b) { | ||
| 669 | return (InputMethodListener)addInternal(a, b); | ||
| 670 | } | ||
| 671 | |||
| 672 | /** | ||
| 673 | * Adds hierarchy-listener-a with hierarchy-listener-b and | ||
| 674 | * returns the resulting multicast listener. | ||
| 675 | * @param a hierarchy-listener-a | ||
| 676 | * @param b hierarchy-listener-b | ||
| 677 | * @since 1.3 | ||
| 678 | */ | ||
| 679 | public static HierarchyListener add(HierarchyListener a, HierarchyListener b) { | ||
| 680 | return (HierarchyListener)addInternal(a, b); | ||
| 681 | } | ||
| 682 | |||
| 683 | /** | ||
| 684 | * Adds hierarchy-bounds-listener-a with hierarchy-bounds-listener-b and | ||
| 685 | * returns the resulting multicast listener. | ||
| 686 | * @param a hierarchy-bounds-listener-a | ||
| 687 | * @param b hierarchy-bounds-listener-b | ||
| 688 | * @since 1.3 | ||
| 689 | */ | ||
| 690 | public static HierarchyBoundsListener add(HierarchyBoundsListener a, HierarchyBoundsListener b) { | ||
| 691 | return (HierarchyBoundsListener)addInternal(a, b); | ||
| 692 | } | ||
| 693 | |||
| 694 | /** | ||
| 695 | * Adds mouse-wheel-listener-a with mouse-wheel-listener-b and | ||
| 696 | * returns the resulting multicast listener. | ||
| 697 | * @param a mouse-wheel-listener-a | ||
| 698 | * @param b mouse-wheel-listener-b | ||
| 699 | * @since 1.4 | ||
| 700 | */ | ||
| 701 | public static MouseWheelListener add(MouseWheelListener a, | ||
| 702 | MouseWheelListener b) { | ||
| 703 | return (MouseWheelListener)addInternal(a, b); | ||
| 704 | } | ||
| 705 | |||
| 706 | /** | ||
| 707 | * Removes the old component-listener from component-listener-l and | ||
| 708 | * returns the resulting multicast listener. | ||
| 709 | * @param l component-listener-l | ||
| 710 | * @param oldl the component-listener being removed | ||
| 711 | */ | ||
| 712 | public static ComponentListener remove(ComponentListener l, ComponentListener oldl) { | ||
| 713 | return (ComponentListener) removeInternal(l, oldl); | ||
| 714 | } | ||
| 715 | |||
| 716 | /** | ||
| 717 | * Removes the old container-listener from container-listener-l and | ||
| 718 | * returns the resulting multicast listener. | ||
| 719 | * @param l container-listener-l | ||
| 720 | * @param oldl the container-listener being removed | ||
| 721 | */ | ||
| 722 | public static ContainerListener remove(ContainerListener l, ContainerListener oldl) { | ||
| 723 | return (ContainerListener) removeInternal(l, oldl); | ||
| 724 | } | ||
| 725 | |||
| 726 | /** | ||
| 727 | * Removes the old focus-listener from focus-listener-l and | ||
| 728 | * returns the resulting multicast listener. | ||
| 729 | * @param l focus-listener-l | ||
| 730 | * @param oldl the focus-listener being removed | ||
| 731 | */ | ||
| 732 | public static FocusListener remove(FocusListener l, FocusListener oldl) { | ||
| 733 | return (FocusListener) removeInternal(l, oldl); | ||
| 734 | } | ||
| 735 | |||
| 736 | /** | ||
| 737 | * Removes the old key-listener from key-listener-l and | ||
| 738 | * returns the resulting multicast listener. | ||
| 739 | * @param l key-listener-l | ||
| 740 | * @param oldl the key-listener being removed | ||
| 741 | */ | ||
| 742 | public static KeyListener remove(KeyListener l, KeyListener oldl) { | ||
| 743 | return (KeyListener) removeInternal(l, oldl); | ||
| 744 | } | ||
| 745 | |||
| 746 | /** | ||
| 747 | * Removes the old mouse-listener from mouse-listener-l and | ||
| 748 | * returns the resulting multicast listener. | ||
| 749 | * @param l mouse-listener-l | ||
| 750 | * @param oldl the mouse-listener being removed | ||
| 751 | */ | ||
| 752 | public static MouseListener remove(MouseListener l, MouseListener oldl) { | ||
| 753 | return (MouseListener) removeInternal(l, oldl); | ||
| 754 | } | ||
| 755 | |||
| 756 | /** | ||
| 757 | * Removes the old mouse-motion-listener from mouse-motion-listener-l | ||
| 758 | * and returns the resulting multicast listener. | ||
| 759 | * @param l mouse-motion-listener-l | ||
| 760 | * @param oldl the mouse-motion-listener being removed | ||
| 761 | */ | ||
| 762 | public static MouseMotionListener remove(MouseMotionListener l, MouseMotionListener oldl) { | ||
| 763 | return (MouseMotionListener) removeInternal(l, oldl); | ||
| 764 | } | ||
| 765 | |||
| 766 | /** | ||
| 767 | * Removes the old window-listener from window-listener-l and | ||
| 768 | * returns the resulting multicast listener. | ||
| 769 | * @param l window-listener-l | ||
| 770 | * @param oldl the window-listener being removed | ||
| 771 | */ | ||
| 772 | public static WindowListener remove(WindowListener l, WindowListener oldl) { | ||
| 773 | return (WindowListener) removeInternal(l, oldl); | ||
| 774 | } | ||
| 775 | |||
| 776 | /** | ||
| 777 | * Removes the old window-state-listener from window-state-listener-l | ||
| 778 | * and returns the resulting multicast listener. | ||
| 779 | * @param l window-state-listener-l | ||
| 780 | * @param oldl the window-state-listener being removed | ||
| 781 | * @since 1.4 | ||
| 782 | */ | ||
| 783 | public static WindowStateListener remove(WindowStateListener l, | ||
| 784 | WindowStateListener oldl) { | ||
| 785 | return (WindowStateListener) removeInternal(l, oldl); | ||
| 786 | } | ||
| 787 | |||
| 788 | /** | ||
| 789 | * Removes the old window-focus-listener from window-focus-listener-l | ||
| 790 | * and returns the resulting multicast listener. | ||
| 791 | * @param l window-focus-listener-l | ||
| 792 | * @param oldl the window-focus-listener being removed | ||
| 793 | * @since 1.4 | ||
| 794 | */ | ||
| 795 | public static WindowFocusListener remove(WindowFocusListener l, | ||
| 796 | WindowFocusListener oldl) { | ||
| 797 | return (WindowFocusListener) removeInternal(l, oldl); | ||
| 798 | } | ||
| 799 | |||
| 800 | /** | ||
| 801 | * Removes the old action-listener from action-listener-l and | ||
| 802 | * returns the resulting multicast listener. | ||
| 803 | * @param l action-listener-l | ||
| 804 | * @param oldl the action-listener being removed | ||
| 805 | */ | ||
| 806 | public static ActionListener remove(ActionListener l, ActionListener oldl) { | ||
| 807 | return (ActionListener) removeInternal(l, oldl); | ||
| 808 | } | ||
| 809 | |||
| 810 | /** | ||
| 811 | * Removes the old item-listener from item-listener-l and | ||
| 812 | * returns the resulting multicast listener. | ||
| 813 | * @param l item-listener-l | ||
| 814 | * @param oldl the item-listener being removed | ||
| 815 | */ | ||
| 816 | public static ItemListener remove(ItemListener l, ItemListener oldl) { | ||
| 817 | return (ItemListener) removeInternal(l, oldl); | ||
| 818 | } | ||
| 819 | |||
| 820 | /** | ||
| 821 | * Removes the old adjustment-listener from adjustment-listener-l and | ||
| 822 | * returns the resulting multicast listener. | ||
| 823 | * @param l adjustment-listener-l | ||
| 824 | * @param oldl the adjustment-listener being removed | ||
| 825 | */ | ||
| 826 | public static AdjustmentListener remove(AdjustmentListener l, AdjustmentListener oldl) { | ||
| 827 | return (AdjustmentListener) removeInternal(l, oldl); | ||
| 828 | } | ||
| 829 | public static TextListener remove(TextListener l, TextListener oldl) { | ||
| 830 | return (TextListener) removeInternal(l, oldl); | ||
| 831 | } | ||
| 832 | |||
| 833 | /** | ||
| 834 | * Removes the old input-method-listener from input-method-listener-l and | ||
| 835 | * returns the resulting multicast listener. | ||
| 836 | * @param l input-method-listener-l | ||
| 837 | * @param oldl the input-method-listener being removed | ||
| 838 | */ | ||
| 839 | public static InputMethodListener remove(InputMethodListener l, InputMethodListener oldl) { | ||
| 840 | return (InputMethodListener) removeInternal(l, oldl); | ||
| 841 | } | ||
| 842 | |||
| 843 | /** | ||
| 844 | * Removes the old hierarchy-listener from hierarchy-listener-l and | ||
| 845 | * returns the resulting multicast listener. | ||
| 846 | * @param l hierarchy-listener-l | ||
| 847 | * @param oldl the hierarchy-listener being removed | ||
| 848 | * @since 1.3 | ||
| 849 | */ | ||
| 850 | public static HierarchyListener remove(HierarchyListener l, HierarchyListener oldl) { | ||
| 851 | return (HierarchyListener) removeInternal(l, oldl); | ||
| 852 | } | ||
| 853 | |||
| 854 | /** | ||
| 855 | * Removes the old hierarchy-bounds-listener from | ||
| 856 | * hierarchy-bounds-listener-l and returns the resulting multicast | ||
| 857 | * listener. | ||
| 858 | * @param l hierarchy-bounds-listener-l | ||
| 859 | * @param oldl the hierarchy-bounds-listener being removed | ||
| 860 | * @since 1.3 | ||
| 861 | */ | ||
| 862 | public static HierarchyBoundsListener remove(HierarchyBoundsListener l, HierarchyBoundsListener oldl) { | ||
| 863 | return (HierarchyBoundsListener) removeInternal(l, oldl); | ||
| 864 | } | ||
| 865 | |||
| 866 | /** | ||
| 867 | * Removes the old mouse-wheel-listener from mouse-wheel-listener-l | ||
| 868 | * and returns the resulting multicast listener. | ||
| 869 | * @param l mouse-wheel-listener-l | ||
| 870 | * @param oldl the mouse-wheel-listener being removed | ||
| 871 | * @since 1.4 | ||
| 872 | */ | ||
| 873 | public static MouseWheelListener remove(MouseWheelListener l, | ||
| 874 | MouseWheelListener oldl) { | ||
| 875 | return (MouseWheelListener) removeInternal(l, oldl); | ||
| 876 | } | ||
| 877 | |||
| 878 | /** | ||
| 879 | * Returns the resulting multicast listener from adding listener-a | ||
| 880 | * and listener-b together. | ||
| 881 | * If listener-a is null, it returns listener-b; | ||
| 882 | * If listener-b is null, it returns listener-a | ||
| 883 | * If neither are null, then it creates and returns | ||
| 884 | * a new AWTEventMulticaster instance which chains a with b. | ||
| 885 | * @param a event listener-a | ||
| 886 | * @param b event listener-b | ||
| 887 | */ | ||
| 888 | protected static EventListener addInternal(EventListener a, EventListener b) { | ||
| 889 | if (a == null) return b; | ||
| 890 | if (b == null) return a; | ||
| 891 | return new AWTEventMulticaster(a, b); | ||
| 892 | } | ||
| 893 | |||
| 894 | /** | ||
| 895 | * Returns the resulting multicast listener after removing the | ||
| 896 | * old listener from listener-l. | ||
| 897 | * If listener-l equals the old listener OR listener-l is null, | ||
| 898 | * returns null. | ||
| 899 | * Else if listener-l is an instance of AWTEventMulticaster, | ||
| 900 | * then it removes the old listener from it. | ||
| 901 | * Else, returns listener l. | ||
| 902 | * @param l the listener being removed from | ||
| 903 | * @param oldl the listener being removed | ||
| 904 | */ | ||
| 905 | protected static EventListener removeInternal(EventListener l, EventListener oldl) { | ||
| 906 | if (l == oldl || l == null) { | ||
| 907 | return null; | ||
| 908 | } else if (l instanceof AWTEventMulticaster) { | ||
| 909 | return ((AWTEventMulticaster)l).remove(oldl); | ||
| 910 | } else { | ||
| 911 | return l; // it's not here | ||
| 912 | } | ||
| 913 | } | ||
| 914 | |||
| 915 | |||
| 916 | /* Serialization support. | ||
| 917 | */ | ||
| 918 | |||
| 919 | protected void saveInternal(ObjectOutputStream s, String k) throws IOException { | ||
| 920 | if (a instanceof AWTEventMulticaster) { | ||
| 921 | ((AWTEventMulticaster)a).saveInternal(s, k); | ||
| 922 | } | ||
| 923 | else if (a instanceof Serializable) { | ||
| 924 | s.writeObject(k); | ||
| 925 | s.writeObject(a); | ||
| 926 | } | ||
| 927 | |||
| 928 | if (b instanceof AWTEventMulticaster) { | ||
| 929 | ((AWTEventMulticaster)b).saveInternal(s, k); | ||
| 930 | } | ||
| 931 | else if (b instanceof Serializable) { | ||
| 932 | s.writeObject(k); | ||
| 933 | s.writeObject(b); | ||
| 934 | } | ||
| 935 | } | ||
| 936 | |||
| 937 | protected static void save(ObjectOutputStream s, String k, EventListener l) throws IOException { | ||
| 938 | if (l == null) { | ||
| 939 | return; | ||
| 940 | } | ||
| 941 | else if (l instanceof AWTEventMulticaster) { | ||
| 942 | ((AWTEventMulticaster)l).saveInternal(s, k); | ||
| 943 | } | ||
| 944 | else if (l instanceof Serializable) { | ||
| 945 | s.writeObject(k); | ||
| 946 | s.writeObject(l); | ||
| 947 | } | ||
| 948 | } | ||
| 949 | |||
| 950 | /* | ||
| 951 | * Recursive method which returns a count of the number of listeners in | ||
| 952 | * EventListener, handling the (common) case of l actually being an | ||
| 953 | * AWTEventMulticaster. Additionally, only listeners of type listenerType | ||
| 954 | * are counted. Method modified to fix bug 4513402. -bchristi | ||
| 955 | */ | ||
| 956 | private static int getListenerCount(EventListener l, Class listenerType) { | ||
| 957 | if (l instanceof AWTEventMulticaster) { | ||
| 958 | AWTEventMulticaster mc = (AWTEventMulticaster)l; | ||
| 959 | return getListenerCount(mc.a, listenerType) + | ||
| 960 | getListenerCount(mc.b, listenerType); | ||
| 961 | } | ||
| 962 | else { | ||
| 963 | // Only count listeners of correct type | ||
| 964 | return listenerType.isInstance(l) ? 1 : 0; | ||
| 965 | } | ||
| 966 | } | ||
| 967 | |||
| 968 | /* | ||
| 969 | * Recusive method which populates EventListener array a with EventListeners | ||
| 970 | * from l. l is usually an AWTEventMulticaster. Bug 4513402 revealed that | ||
| 971 | * if l differed in type from the element type of a, an ArrayStoreException | ||
| 972 | * would occur. Now l is only inserted into a if it's of the appropriate | ||
| 973 | * type. -bchristi | ||
| 974 | */ | ||
| 975 | private static int populateListenerArray(EventListener[] a, EventListener l, int index) { | ||
| 976 | if (l instanceof AWTEventMulticaster) { | ||
| 977 | AWTEventMulticaster mc = (AWTEventMulticaster)l; | ||
| 978 | int lhs = populateListenerArray(a, mc.a, index); | ||
| 979 | return populateListenerArray(a, mc.b, lhs); | ||
| 980 | } | ||
| 981 | else if (a.getClass().getComponentType().isInstance(l)) { | ||
| 982 | a[index] = l; | ||
| 983 | return index + 1; | ||
| 984 | } | ||
| 985 | // Skip nulls, instances of wrong class | ||
| 986 | else { | ||
| 987 | return index; | ||
| 988 | } | ||
| 989 | } | ||
| 990 | |||
| 991 | /** | ||
| 992 | * Returns an array of all the objects chained as | ||
| 993 | * <code><em>Foo</em>Listener</code>s by the specified | ||
| 994 | * <code>java.util.EventListener</code>. | ||
| 995 | * <code><em>Foo</em>Listener</code>s are chained by the | ||
| 996 | * <code>AWTEventMulticaster</code> using the | ||
| 997 | * <code>add<em>Foo</em>Listener</code> method. | ||
| 998 | * If a <code>null</code> listener is specified, this method returns an | ||
| 999 | * empty array. If the specified listener is not an instance of | ||
| 1000 | * <code>AWTEventMulticaster</code>, this method returns an array which | ||
| 1001 | * contains only the specified listener. If no such listeners are chanined, | ||
| 1002 | * this method returns an empty array. | ||
| 1003 | * | ||
| 1004 | * @param l the specified <code>java.util.EventListener</code> | ||
| 1005 | * @param listenerType the type of listeners requested; this parameter | ||
| 1006 | * should specify an interface that descends from | ||
| 1007 | * <code>java.util.EventListener</code> | ||
| 1008 | * @return an array of all objects chained as | ||
| 1009 | * <code><em>Foo</em>Listener</code>s by the specified multicast | ||
| 1010 | * listener, or an empty array if no such listeners have been | ||
| 1011 | * chained by the specified multicast listener | ||
| 1012 | * @exception NullPointerException if the specified | ||
| 1013 | * {@code listenertype} parameter is {@code null} | ||
| 1014 | * @exception ClassCastException if <code>listenerType</code> | ||
| 1015 | * doesn't specify a class or interface that implements | ||
| 1016 | * <code>java.util.EventListener</code> | ||
| 1017 | * | ||
| 1018 | * @since 1.4 | ||
| 1019 | */ | ||
| 1020 | public static <T extends EventListener> T[] | ||
| 1021 | getListeners(EventListener l, Class<T> listenerType) | ||
| 1022 | { | ||
| 1023 | if (listenerType == null) { | ||
| 1024 | throw new NullPointerException ("Listener type should not be null"); | ||
| 1025 | } | ||
| 1026 | |||
| 1027 | int n = getListenerCount(l, listenerType); | ||
| 1028 | T[] result = (T[])Array.newInstance(listenerType, n); | ||
| 1029 | populateListenerArray(result, l, 0); | ||
| 1030 | return result; | ||
| 1031 | } | ||
| 1032 | } | ||