J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2005-2006 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 java.awt; |
| 27 | |
| 28 | import java.io.File; |
| 29 | import java.io.IOException; |
| 30 | import java.net.URISyntaxException; |
| 31 | import java.net.URI; |
| 32 | import java.net.URL; |
| 33 | import java.net.MalformedURLException; |
| 34 | import java.awt.AWTPermission; |
| 35 | import java.awt.GraphicsEnvironment; |
| 36 | import java.awt.HeadlessException; |
| 37 | import java.awt.peer.DesktopPeer; |
| 38 | import sun.awt.SunToolkit; |
| 39 | import sun.awt.HeadlessToolkit; |
| 40 | import java.io.FilePermission; |
| 41 | import sun.security.util.SecurityConstants; |
| 42 | |
| 43 | /** |
| 44 | * The {@code Desktop} class allows a Java application to launch |
| 45 | * associated applications registered on the native desktop to handle |
| 46 | * a {@link java.net.URI} or a file. |
| 47 | * |
| 48 | * <p> Supported operations include: |
| 49 | * <ul> |
| 50 | * <li>launching the user-default browser to show a specified |
| 51 | * URI;</li> |
| 52 | * <li>launching the user-default mail client with an optional |
| 53 | * {@code mailto} URI;</li> |
| 54 | * <li>launching a registered application to open, edit or print a |
| 55 | * specified file.</li> |
| 56 | * </ul> |
| 57 | * |
| 58 | * <p> This class provides methods corresponding to these |
| 59 | * operations. The methods look for the associated application |
| 60 | * registered on the current platform, and launch it to handle a URI |
| 61 | * or file. If there is no associated application or the associated |
| 62 | * application fails to be launched, an exception is thrown. |
| 63 | * |
| 64 | * <p> An application is registered to a URI or file type; for |
| 65 | * example, the {@code "sxi"} file extension is typically registered |
| 66 | * to StarOffice. The mechanism of registering, accessing, and |
| 67 | * launching the associated application is platform-dependent. |
| 68 | * |
| 69 | * <p> Each operation is an action type represented by the {@link |
| 70 | * Desktop.Action} class. |
| 71 | * |
| 72 | * <p> Note: when some action is invoked and the associated |
| 73 | * application is executed, it will be executed on the same system as |
| 74 | * the one on which the Java application was launched. |
| 75 | * |
| 76 | * @since 1.6 |
| 77 | * @author Armin Chen |
| 78 | * @author George Zhang |
| 79 | */ |
| 80 | public class Desktop { |
| 81 | |
| 82 | /** |
| 83 | * Represents an action type. Each platform supports a different |
| 84 | * set of actions. You may use the {@link Desktop#isSupported} |
| 85 | * method to determine if the given action is supported by the |
| 86 | * current platform. |
| 87 | * @see java.awt.Desktop#isSupported(java.awt.Desktop.Action) |
| 88 | * @since 1.6 |
| 89 | */ |
| 90 | public static enum Action { |
| 91 | /** |
| 92 | * Represents an "open" action. |
| 93 | * @see Desktop#open(java.io.File) |
| 94 | */ |
| 95 | OPEN, |
| 96 | /** |
| 97 | * Represents an "edit" action. |
| 98 | * @see Desktop#edit(java.io.File) |
| 99 | */ |
| 100 | EDIT, |
| 101 | /** |
| 102 | * Represents a "print" action. |
| 103 | * @see Desktop#print(java.io.File) |
| 104 | */ |
| 105 | PRINT, |
| 106 | /** |
| 107 | * Represents a "mail" action. |
| 108 | * @see Desktop#mail() |
| 109 | * @see Desktop#mail(java.net.URI) |
| 110 | */ |
| 111 | MAIL, |
| 112 | /** |
| 113 | * Represents a "browse" action. |
| 114 | * @see Desktop#browse(java.net.URI) |
| 115 | */ |
| 116 | BROWSE |
| 117 | }; |
| 118 | |
| 119 | private DesktopPeer peer; |
| 120 | |
| 121 | /** |
| 122 | * Suppresses default constructor for noninstantiability. |
| 123 | */ |
| 124 | private Desktop() { |
| 125 | peer = Toolkit.getDefaultToolkit().createDesktopPeer(this); |
| 126 | } |
| 127 | |
| 128 | /** |
| 129 | * Returns the <code>Desktop</code> instance of the current |
| 130 | * browser context. On some platforms the Desktop API may not be |
| 131 | * supported; use the {@link #isDesktopSupported} method to |
| 132 | * determine if the current desktop is supported. |
| 133 | * @return the Desktop instance of the current browser context |
| 134 | * @throws HeadlessException if {@link |
| 135 | * GraphicsEnvironment#isHeadless()} returns {@code true} |
| 136 | * @throws UnsupportedOperationException if this class is not |
| 137 | * supported on the current platform |
| 138 | * @see #isDesktopSupported() |
| 139 | * @see java.awt.GraphicsEnvironment#isHeadless |
| 140 | */ |
| 141 | public static synchronized Desktop getDesktop(){ |
| 142 | if (GraphicsEnvironment.isHeadless()) throw new HeadlessException(); |
| 143 | if (!Desktop.isDesktopSupported()) { |
| 144 | throw new UnsupportedOperationException("Desktop API is not " + |
| 145 | "supported on the current platform"); |
| 146 | } |
| 147 | |
| 148 | sun.awt.AppContext context = sun.awt.AppContext.getAppContext(); |
| 149 | Desktop desktop = (Desktop)context.get(Desktop.class); |
| 150 | |
| 151 | if (desktop == null) { |
| 152 | desktop = new Desktop(); |
| 153 | context.put(Desktop.class, desktop); |
| 154 | } |
| 155 | |
| 156 | return desktop; |
| 157 | } |
| 158 | |
| 159 | /** |
| 160 | * Tests whether this class is supported on the current platform. |
| 161 | * If it's supported, use {@link #getDesktop()} to retrieve an |
| 162 | * instance. |
| 163 | * |
| 164 | * @return <code>true</code> if this class is supported on the |
| 165 | * current platform; <code>false</code> otherwise |
| 166 | * @see #getDesktop() |
| 167 | */ |
| 168 | public static boolean isDesktopSupported(){ |
| 169 | Toolkit defaultToolkit = Toolkit.getDefaultToolkit(); |
| 170 | if (defaultToolkit instanceof SunToolkit) { |
| 171 | return ((SunToolkit)defaultToolkit).isDesktopSupported(); |
| 172 | } |
| 173 | return false; |
| 174 | } |
| 175 | |
| 176 | /** |
| 177 | * Tests whether an action is supported on the current platform. |
| 178 | * |
| 179 | * <p>Even when the platform supports an action, a file or URI may |
| 180 | * not have a registered application for the action. For example, |
| 181 | * most of the platforms support the {@link Desktop.Action#OPEN} |
| 182 | * action. But for a specific file, there may not be an |
| 183 | * application registered to open it. In this case, {@link |
| 184 | * #isSupported} may return {@code true}, but the corresponding |
| 185 | * action method will throw an {@link IOException}. |
| 186 | * |
| 187 | * @param action the specified {@link Action} |
| 188 | * @return <code>true</code> if the specified action is supported on |
| 189 | * the current platform; <code>false</code> otherwise |
| 190 | * @see Desktop.Action |
| 191 | */ |
| 192 | public boolean isSupported(Action action) { |
| 193 | return peer.isSupported(action); |
| 194 | } |
| 195 | |
| 196 | /** |
| 197 | * Checks if the file is a valid file and readable. |
| 198 | * |
| 199 | * @throws SecurityException If a security manager exists and its |
| 200 | * {@link SecurityManager#checkRead(java.lang.String)} method |
| 201 | * denies read access to the file |
| 202 | * @throws NullPointerException if file is null |
| 203 | * @throws IllegalArgumentException if file doesn't exist |
| 204 | */ |
| 205 | private static void checkFileValidation(File file){ |
| 206 | if (file == null) throw new NullPointerException("File must not be null"); |
| 207 | |
| 208 | if (!file.exists()) { |
| 209 | throw new IllegalArgumentException("The file: " |
| 210 | + file.getPath() + " doesn't exist."); |
| 211 | } |
| 212 | |
| 213 | file.canRead(); |
| 214 | } |
| 215 | |
| 216 | /** |
| 217 | * Checks if the action type is supported. |
| 218 | * |
| 219 | * @param actionType the action type in question |
| 220 | * @throws UnsupportedOperationException if the specified action type is not |
| 221 | * supported on the current platform |
| 222 | */ |
| 223 | private void checkActionSupport(Action actionType){ |
| 224 | if (!isSupported(actionType)) { |
| 225 | throw new UnsupportedOperationException("The " + actionType.name() |
| 226 | + " action is not supported on the current platform!"); |
| 227 | } |
| 228 | } |
| 229 | |
| 230 | |
| 231 | /** |
| 232 | * Calls to the security manager's <code>checkPermission</code> method with |
| 233 | * an <code>AWTPermission("showWindowWithoutWarningBanner")</code> |
| 234 | * permission. |
| 235 | */ |
| 236 | private void checkAWTPermission(){ |
| 237 | SecurityManager sm = System.getSecurityManager(); |
| 238 | if (sm != null) { |
| 239 | sm.checkPermission(new AWTPermission( |
| 240 | "showWindowWithoutWarningBanner")); |
| 241 | } |
| 242 | } |
| 243 | |
| 244 | /** |
| 245 | * Launches the associated application to open the file. |
| 246 | * |
| 247 | * <p> If the specified file is a directory, the file manager of |
| 248 | * the current platform is launched to open it. |
| 249 | * |
| 250 | * @param file the file to be opened with the associated application |
| 251 | * @throws NullPointerException if {@code file} is {@code null} |
| 252 | * @throws IllegalArgumentException if the specified file doesn't |
| 253 | * exist |
| 254 | * @throws UnsupportedOperationException if the current platform |
| 255 | * does not support the {@link Desktop.Action#OPEN} action |
| 256 | * @throws IOException if the specified file has no associated |
| 257 | * application or the associated application fails to be launched |
| 258 | * @throws SecurityException if a security manager exists and its |
| 259 | * {@link java.lang.SecurityManager#checkRead(java.lang.String)} |
| 260 | * method denies read access to the file, or it denies the |
| 261 | * <code>AWTPermission("showWindowWithoutWarningBanner")</code> |
| 262 | * permission, or the calling thread is not allowed to create a |
| 263 | * subprocess |
| 264 | * @see java.awt.AWTPermission |
| 265 | */ |
| 266 | public void open(File file) throws IOException { |
| 267 | checkAWTPermission(); |
| 268 | checkExec(); |
| 269 | checkActionSupport(Action.OPEN); |
| 270 | checkFileValidation(file); |
| 271 | |
| 272 | peer.open(file); |
| 273 | } |
| 274 | |
| 275 | /** |
| 276 | * Launches the associated editor application and opens a file for |
| 277 | * editing. |
| 278 | * |
| 279 | * @param file the file to be opened for editing |
| 280 | * @throws NullPointerException if the specified file is {@code null} |
| 281 | * @throws IllegalArgumentException if the specified file doesn't |
| 282 | * exist |
| 283 | * @throws UnsupportedOperationException if the current platform |
| 284 | * does not support the {@link Desktop.Action#EDIT} action |
| 285 | * @throws IOException if the specified file has no associated |
| 286 | * editor, or the associated application fails to be launched |
| 287 | * @throws SecurityException if a security manager exists and its |
| 288 | * {@link java.lang.SecurityManager#checkRead(java.lang.String)} |
| 289 | * method denies read access to the file, or {@link |
| 290 | * java.lang.SecurityManager#checkWrite(java.lang.String)} method |
| 291 | * denies write access to the file, or it denies the |
| 292 | * <code>AWTPermission("showWindowWithoutWarningBanner")</code> |
| 293 | * permission, or the calling thread is not allowed to create a |
| 294 | * subprocess |
| 295 | * @see java.awt.AWTPermission |
| 296 | */ |
| 297 | public void edit(File file) throws IOException { |
| 298 | checkAWTPermission(); |
| 299 | checkExec(); |
| 300 | checkActionSupport(Action.EDIT); |
| 301 | file.canWrite(); |
| 302 | checkFileValidation(file); |
| 303 | |
| 304 | peer.edit(file); |
| 305 | } |
| 306 | |
| 307 | /** |
| 308 | * Prints a file with the native desktop printing facility, using |
| 309 | * the associated application's print command. |
| 310 | * |
| 311 | * @param file the file to be printed |
| 312 | * @throws NullPointerException if the specified file is {@code |
| 313 | * null} |
| 314 | * @throws IllegalArgumentException if the specified file doesn't |
| 315 | * exist |
| 316 | * @throws UnsupportedOperationException if the current platform |
| 317 | * does not support the {@link Desktop.Action#PRINT} action |
| 318 | * @throws IOException if the specified file has no associated |
| 319 | * application that can be used to print it |
| 320 | * @throws SecurityException if a security manager exists and its |
| 321 | * {@link java.lang.SecurityManager#checkRead(java.lang.String)} |
| 322 | * method denies read access to the file, or its {@link |
| 323 | * java.lang.SecurityManager#checkPrintJobAccess()} method denies |
| 324 | * the permission to print the file, or the calling thread is not |
| 325 | * allowed to create a subprocess |
| 326 | */ |
| 327 | public void print(File file) throws IOException { |
| 328 | checkExec(); |
| 329 | SecurityManager sm = System.getSecurityManager(); |
| 330 | if (sm != null) { |
| 331 | sm.checkPrintJobAccess(); |
| 332 | } |
| 333 | checkActionSupport(Action.PRINT); |
| 334 | checkFileValidation(file); |
| 335 | |
| 336 | peer.print(file); |
| 337 | } |
| 338 | |
| 339 | /** |
| 340 | * Launches the default browser to display a {@code URI}. |
| 341 | * If the default browser is not able to handle the specified |
| 342 | * {@code URI}, the application registered for handling |
| 343 | * {@code URIs} of the specified type is invoked. The application |
| 344 | * is determined from the protocol and path of the {@code URI}, as |
| 345 | * defined by the {@code URI} class. |
| 346 | * <p> |
| 347 | * If the calling thread does not have the necessary permissions, |
| 348 | * and this is invoked from within an applet, |
| 349 | * {@code AppletContext.showDocument()} is used. Similarly, if the calling |
| 350 | * does not have the necessary permissions, and this is invoked from within |
| 351 | * a Java Web Started application, {@code BasicService.showDocument()} |
| 352 | * is used. |
| 353 | * |
| 354 | * @param uri the URI to be displayed in the user default browser |
| 355 | * @throws NullPointerException if {@code uri} is {@code null} |
| 356 | * @throws UnsupportedOperationException if the current platform |
| 357 | * does not support the {@link Desktop.Action#BROWSE} action |
| 358 | * @throws IOException if the user default browser is not found, |
| 359 | * or it fails to be launched, or the default handler application |
| 360 | * failed to be launched |
| 361 | * @throws SecurityException if a security manager exists and it |
| 362 | * denies the |
| 363 | * <code>AWTPermission("showWindowWithoutWarningBanner")</code> |
| 364 | * permission, or the calling thread is not allowed to create a |
| 365 | * subprocess; and not invoked from within an applet or Java Web Started |
| 366 | * application |
| 367 | * @throws IllegalArgumentException if the necessary permissions |
| 368 | * are not available and the URI can not be converted to a {@code URL} |
| 369 | * @see java.net.URI |
| 370 | * @see java.awt.AWTPermission |
| 371 | * @see java.applet.AppletContext |
| 372 | */ |
| 373 | public void browse(URI uri) throws IOException { |
| 374 | SecurityException securityException = null; |
| 375 | try { |
| 376 | checkAWTPermission(); |
| 377 | checkExec(); |
| 378 | } catch (SecurityException e) { |
| 379 | securityException = e; |
| 380 | } |
| 381 | checkActionSupport(Action.BROWSE); |
| 382 | if (uri == null) { |
| 383 | throw new NullPointerException(); |
| 384 | } |
| 385 | if (securityException == null) { |
| 386 | peer.browse(uri); |
| 387 | return; |
| 388 | } |
| 389 | |
| 390 | // Calling thread doesn't have necessary priviledges. |
| 391 | // Delegate to DesktopBrowse so that it can work in |
| 392 | // applet/webstart. |
| 393 | URL url = null; |
| 394 | try { |
| 395 | url = uri.toURL(); |
| 396 | } catch (MalformedURLException e) { |
| 397 | throw new IllegalArgumentException("Unable to convert URI to URL", e); |
| 398 | } |
| 399 | sun.awt.DesktopBrowse db = sun.awt.DesktopBrowse.getInstance(); |
| 400 | if (db == null) { |
| 401 | // Not in webstart/applet, throw the exception. |
| 402 | throw securityException; |
| 403 | } |
| 404 | db.browse(url); |
| 405 | } |
| 406 | |
| 407 | /** |
| 408 | * Launches the mail composing window of the user default mail |
| 409 | * client. |
| 410 | * |
| 411 | * @throws UnsupportedOperationException if the current platform |
| 412 | * does not support the {@link Desktop.Action#MAIL} action |
| 413 | * @throws IOException if the user default mail client is not |
| 414 | * found, or it fails to be launched |
| 415 | * @throws SecurityException if a security manager exists and it |
| 416 | * denies the |
| 417 | * <code>AWTPermission("showWindowWithoutWarningBanner")</code> |
| 418 | * permission, or the calling thread is not allowed to create a |
| 419 | * subprocess |
| 420 | * @see java.awt.AWTPermission |
| 421 | */ |
| 422 | public void mail() throws IOException { |
| 423 | checkAWTPermission(); |
| 424 | checkExec(); |
| 425 | checkActionSupport(Action.MAIL); |
| 426 | URI mailtoURI = null; |
| 427 | try{ |
| 428 | mailtoURI = new URI("mailto:?"); |
| 429 | peer.mail(mailtoURI); |
| 430 | } catch (URISyntaxException e){ |
| 431 | // won't reach here. |
| 432 | } |
| 433 | } |
| 434 | |
| 435 | /** |
| 436 | * Launches the mail composing window of the user default mail |
| 437 | * client, filling the message fields specified by a {@code |
| 438 | * mailto:} URI. |
| 439 | * |
| 440 | * <p> A <code>mailto:</code> URI can specify message fields |
| 441 | * including <i>"to"</i>, <i>"cc"</i>, <i>"subject"</i>, |
| 442 | * <i>"body"</i>, etc. See <a |
| 443 | * href="http://www.ietf.org/rfc/rfc2368.txt">The mailto URL |
| 444 | * scheme (RFC 2368)</a> for the {@code mailto:} URI specification |
| 445 | * details. |
| 446 | * |
| 447 | * @param mailtoURI the specified {@code mailto:} URI |
| 448 | * @throws NullPointerException if the specified URI is {@code |
| 449 | * null} |
| 450 | * @throws IllegalArgumentException if the URI scheme is not |
| 451 | * <code>"mailto"</code> |
| 452 | * @throws UnsupportedOperationException if the current platform |
| 453 | * does not support the {@link Desktop.Action#MAIL} action |
| 454 | * @throws IOException if the user default mail client is not |
| 455 | * found or fails to be launched |
| 456 | * @throws SecurityException if a security manager exists and it |
| 457 | * denies the |
| 458 | * <code>AWTPermission("showWindowWithoutWarningBanner")</code> |
| 459 | * permission, or the calling thread is not allowed to create a |
| 460 | * subprocess |
| 461 | * @see java.net.URI |
| 462 | * @see java.awt.AWTPermission |
| 463 | */ |
| 464 | public void mail(URI mailtoURI) throws IOException { |
| 465 | checkAWTPermission(); |
| 466 | checkExec(); |
| 467 | checkActionSupport(Action.MAIL); |
| 468 | if (mailtoURI == null) throw new NullPointerException(); |
| 469 | |
| 470 | if (!"mailto".equalsIgnoreCase(mailtoURI.getScheme())) { |
| 471 | throw new IllegalArgumentException("URI scheme is not \"mailto\""); |
| 472 | } |
| 473 | |
| 474 | peer.mail(mailtoURI); |
| 475 | } |
| 476 | |
| 477 | private void checkExec() throws SecurityException { |
| 478 | SecurityManager sm = System.getSecurityManager(); |
| 479 | if (sm != null) { |
| 480 | sm.checkPermission(new FilePermission("<<ALL FILES>>", |
| 481 | SecurityConstants.FILE_EXECUTE_ACTION)); |
| 482 | } |
| 483 | } |
| 484 | } |