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| 1 | /* | ||
| 2 | * Copyright (c) 2000, 2005, 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 | |||
| 26 | package javax.imageio; | ||
| 27 | |||
| 28 | import java.awt.image.BufferedImage; | ||
| 29 | import java.awt.image.RenderedImage; | ||
| 30 | import java.io.File; | ||
| 31 | import java.io.FilePermission; | ||
| 32 | import java.io.InputStream; | ||
| 33 | import java.io.IOException; | ||
| 34 | import java.io.OutputStream; | ||
| 35 | import java.lang.reflect.Method; | ||
| 36 | import java.net.URL; | ||
| 37 | import java.security.AccessController; | ||
| 38 | import java.util.Arrays; | ||
| 39 | import java.util.Collections; | ||
| 40 | import java.util.HashSet; | ||
| 41 | import java.util.Iterator; | ||
| 42 | import java.util.NoSuchElementException; | ||
| 43 | import java.util.Set; | ||
| 44 | import javax.imageio.spi.IIORegistry; | ||
| 45 | import javax.imageio.spi.ImageReaderSpi; | ||
| 46 | import javax.imageio.spi.ImageReaderWriterSpi; | ||
| 47 | import javax.imageio.spi.ImageWriterSpi; | ||
| 48 | import javax.imageio.spi.ImageInputStreamSpi; | ||
| 49 | import javax.imageio.spi.ImageOutputStreamSpi; | ||
| 50 | import javax.imageio.spi.ImageTranscoderSpi; | ||
| 51 | import javax.imageio.spi.ServiceRegistry; | ||
| 52 | import javax.imageio.stream.ImageInputStream; | ||
| 53 | import javax.imageio.stream.ImageOutputStream; | ||
| 54 | import sun.awt.AppContext; | ||
| 55 | import sun.security.action.GetPropertyAction; | ||
| 56 | |||
| 57 | /** | ||
| 58 | * A class containing static convenience methods for locating | ||
| 59 | * <code>ImageReader</code>s and <code>ImageWriter</code>s, and | ||
| 60 | * performing simple encoding and decoding. | ||
| 61 | * | ||
| 62 | */ | ||
| 63 | public final class ImageIO { | ||
| 64 | |||
| 65 | private static final IIORegistry theRegistry = | ||
| 66 | IIORegistry.getDefaultInstance(); | ||
| 67 | |||
| 68 | /** | ||
| 69 | * Constructor is private to prevent instantiation. | ||
| 70 | */ | ||
| 71 | private ImageIO() {} | ||
| 72 | |||
| 73 | /** | ||
| 74 | * Scans for plug-ins on the application class path, | ||
| 75 | * loads their service provider classes, and registers a service | ||
| 76 | * provider instance for each one found with the | ||
| 77 | * <code>IIORegistry</code>. | ||
| 78 | * | ||
| 79 | * <p>This method is needed because the application class path can | ||
| 80 | * theoretically change, or additional plug-ins may become available. | ||
| 81 | * Rather than re-scanning the classpath on every invocation of the | ||
| 82 | * API, the class path is scanned automatically only on the first | ||
| 83 | * invocation. Clients can call this method to prompt a re-scan. | ||
| 84 | * Thus this method need only be invoked by sophisticated applications | ||
| 85 | * which dynamically make new plug-ins available at runtime. | ||
| 86 | * | ||
| 87 | * <p> The <code>getResources</code> method of the context | ||
| 88 | * <code>ClassLoader</code> is used locate JAR files containing | ||
| 89 | * files named | ||
| 90 | * <code>META-INF/services/javax.imageio.spi.</code><i>classname</i>, | ||
| 91 | * where <i>classname</i> is one of <code>ImageReaderSpi</code>, | ||
| 92 | * <code>ImageWriterSpi</code>, <code>ImageTranscoderSpi</code>, | ||
| 93 | * <code>ImageInputStreamSpi</code>, or | ||
| 94 | * <code>ImageOutputStreamSpi</code>, along the application class | ||
| 95 | * path. | ||
| 96 | * | ||
| 97 | * <p> The contents of the located files indicate the names of | ||
| 98 | * actual implementation classes which implement the | ||
| 99 | * aforementioned service provider interfaces; the default class | ||
| 100 | * loader is then used to load each of these classes and to | ||
| 101 | * instantiate an instance of each class, which is then placed | ||
| 102 | * into the registry for later retrieval. | ||
| 103 | * | ||
| 104 | * <p> The exact set of locations searched depends on the | ||
| 105 | * implementation of the Java runtime enviroment. | ||
| 106 | * | ||
| 107 | * @see ClassLoader#getResources | ||
| 108 | */ | ||
| 109 | public static void scanForPlugins() { | ||
| 110 | theRegistry.registerApplicationClasspathSpis(); | ||
| 111 | } | ||
| 112 | |||
| 113 | // ImageInputStreams | ||
| 114 | |||
| 115 | /** | ||
| 116 | * A class to hold information about caching. Each | ||
| 117 | * <code>ThreadGroup</code> will have its own copy | ||
| 118 | * via the <code>AppContext</code> mechanism. | ||
| 119 | */ | ||
| 120 | static class CacheInfo { | ||
| 121 | boolean useCache = true; | ||
| 122 | File cacheDirectory = null; | ||
| 123 | Boolean hasPermission = null; | ||
| 124 | |||
| 125 | public CacheInfo() {} | ||
| 126 | |||
| 127 | public boolean getUseCache() { | ||
| 128 | return useCache; | ||
| 129 | } | ||
| 130 | |||
| 131 | public void setUseCache(boolean useCache) { | ||
| 132 | this.useCache = useCache; | ||
| 133 | } | ||
| 134 | |||
| 135 | public File getCacheDirectory() { | ||
| 136 | return cacheDirectory; | ||
| 137 | } | ||
| 138 | |||
| 139 | public void setCacheDirectory(File cacheDirectory) { | ||
| 140 | this.cacheDirectory = cacheDirectory; | ||
| 141 | } | ||
| 142 | |||
| 143 | public Boolean getHasPermission() { | ||
| 144 | return hasPermission; | ||
| 145 | } | ||
| 146 | |||
| 147 | public void setHasPermission(Boolean hasPermission) { | ||
| 148 | this.hasPermission = hasPermission; | ||
| 149 | } | ||
| 150 | } | ||
| 151 | |||
| 152 | /** | ||
| 153 | * Returns the <code>CacheInfo</code> object associated with this | ||
| 154 | * <code>ThreadGroup</code>. | ||
| 155 | */ | ||
| 156 | private static synchronized CacheInfo getCacheInfo() { | ||
| 157 | AppContext context = AppContext.getAppContext(); | ||
| 158 | CacheInfo info = (CacheInfo)context.get(CacheInfo.class); | ||
| 159 | if (info == null) { | ||
| 160 | info = new CacheInfo(); | ||
| 161 | context.put(CacheInfo.class, info); | ||
| 162 | } | ||
| 163 | return info; | ||
| 164 | } | ||
| 165 | |||
| 166 | /** | ||
| 167 | * Returns the default temporary (cache) directory as defined by the | ||
| 168 | * java.io.tmpdir system property. | ||
| 169 | */ | ||
| 170 | private static String getTempDir() { | ||
| 171 | GetPropertyAction a = new GetPropertyAction("java.io.tmpdir"); | ||
| 172 | return (String)AccessController.doPrivileged(a); | ||
| 173 | } | ||
| 174 | |||
| 175 | /** | ||
| 176 | * Determines whether the caller has write access to the cache | ||
| 177 | * directory, stores the result in the <code>CacheInfo</code> object, | ||
| 178 | * and returns the decision. This method helps to prevent mysterious | ||
| 179 | * SecurityExceptions to be thrown when this convenience class is used | ||
| 180 | * in an applet, for example. | ||
| 181 | */ | ||
| 182 | private static boolean hasCachePermission() { | ||
| 183 | Boolean hasPermission = getCacheInfo().getHasPermission(); | ||
| 184 | |||
| 185 | if (hasPermission != null) { | ||
| 186 | return hasPermission.booleanValue(); | ||
| 187 | } else { | ||
| 188 | try { | ||
| 189 | SecurityManager security = System.getSecurityManager(); | ||
| 190 | if (security != null) { | ||
| 191 | File cachedir = getCacheDirectory(); | ||
| 192 | String cachepath; | ||
| 193 | |||
| 194 | if (cachedir != null) { | ||
| 195 | cachepath = cachedir.getPath(); | ||
| 196 | } else { | ||
| 197 | cachepath = getTempDir(); | ||
| 198 | |||
| 199 | if (cachepath == null || cachepath.isEmpty()) { | ||
| 200 | getCacheInfo().setHasPermission(Boolean.FALSE); | ||
| 201 | return false; | ||
| 202 | } | ||
| 203 | } | ||
| 204 | |||
| 205 | // we have to check whether we can read, write, | ||
| 206 | // and delete cache files. | ||
| 207 | // So, compose cache file path and check it. | ||
| 208 | String filepath = cachepath; | ||
| 209 | if (!filepath.endsWith(File.separator)) { | ||
| 210 | filepath += File.separator; | ||
| 211 | } | ||
| 212 | filepath += "*"; | ||
| 213 | |||
| 214 | security.checkPermission(new FilePermission(filepath, "read, write, delete")); | ||
| 215 | } | ||
| 216 | } catch (SecurityException e) { | ||
| 217 | getCacheInfo().setHasPermission(Boolean.FALSE); | ||
| 218 | return false; | ||
| 219 | } | ||
| 220 | |||
| 221 | getCacheInfo().setHasPermission(Boolean.TRUE); | ||
| 222 | return true; | ||
| 223 | } | ||
| 224 | } | ||
| 225 | |||
| 226 | /** | ||
| 227 | * Sets a flag indicating whether a disk-based cache file should | ||
| 228 | * be used when creating <code>ImageInputStream</code>s and | ||
| 229 | * <code>ImageOutputStream</code>s. | ||
| 230 | * | ||
| 231 | * <p> When reading from a standard <code>InputStream</code>>, it | ||
| 232 | * may be necessary to save previously read information in a cache | ||
| 233 | * since the underlying stream does not allow data to be re-read. | ||
| 234 | * Similarly, when writing to a standard | ||
| 235 | * <code>OutputStream</code>, a cache may be used to allow a | ||
| 236 | * previously written value to be changed before flushing it to | ||
| 237 | * the final destination. | ||
| 238 | * | ||
| 239 | * <p> The cache may reside in main memory or on disk. Setting | ||
| 240 | * this flag to <code>false</code> disallows the use of disk for | ||
| 241 | * future streams, which may be advantageous when working with | ||
| 242 | * small images, as the overhead of creating and destroying files | ||
| 243 | * is removed. | ||
| 244 | * | ||
| 245 | * <p> On startup, the value is set to <code>true</code>. | ||
| 246 | * | ||
| 247 | * @param useCache a <code>boolean</code> indicating whether a | ||
| 248 | * cache file should be used, in cases where it is optional. | ||
| 249 | * | ||
| 250 | * @see #getUseCache | ||
| 251 | */ | ||
| 252 | public static void setUseCache(boolean useCache) { | ||
| 253 | getCacheInfo().setUseCache(useCache); | ||
| 254 | } | ||
| 255 | |||
| 256 | /** | ||
| 257 | * Returns the current value set by <code>setUseCache</code>, or | ||
| 258 | * <code>true</code> if no explicit setting has been made. | ||
| 259 | * | ||
| 260 | * @return true if a disk-based cache may be used for | ||
| 261 | * <code>ImageInputStream</code>s and | ||
| 262 | * <code>ImageOutputStream</code>s. | ||
| 263 | * | ||
| 264 | * @see #setUseCache | ||
| 265 | */ | ||
| 266 | public static boolean getUseCache() { | ||
| 267 | return getCacheInfo().getUseCache(); | ||
| 268 | } | ||
| 269 | |||
| 270 | /** | ||
| 271 | * Sets the directory where cache files are to be created. A | ||
| 272 | * value of <code>null</code> indicates that the system-dependent | ||
| 273 | * default temporary-file directory is to be used. If | ||
| 274 | * <code>getUseCache</code> returns false, this value is ignored. | ||
| 275 | * | ||
| 276 | * @param cacheDirectory a <code>File</code> specifying a directory. | ||
| 277 | * | ||
| 278 | * @see File#createTempFile(String, String, File) | ||
| 279 | * | ||
| 280 | * @exception SecurityException if the security manager denies | ||
| 281 | * access to the directory. | ||
| 282 | * @exception IllegalArgumentException if <code>cacheDir</code> is | ||
| 283 | * non-<code>null</code> but is not a directory. | ||
| 284 | * | ||
| 285 | * @see #getCacheDirectory | ||
| 286 | */ | ||
| 287 | public static void setCacheDirectory(File cacheDirectory) { | ||
| 288 | if ((cacheDirectory != null) && !(cacheDirectory.isDirectory())) { | ||
| 289 | throw new IllegalArgumentException("Not a directory!"); | ||
| 290 | } | ||
| 291 | getCacheInfo().setCacheDirectory(cacheDirectory); | ||
| 292 | getCacheInfo().setHasPermission(null); | ||
| 293 | } | ||
| 294 | |||
| 295 | /** | ||
| 296 | * Returns the current value set by | ||
| 297 | * <code>setCacheDirectory</code>, or <code>null</code> if no | ||
| 298 | * explicit setting has been made. | ||
| 299 | * | ||
| 300 | * @return a <code>File</code> indicating the directory where | ||
| 301 | * cache files will be created, or <code>null</code> to indicate | ||
| 302 | * the system-dependent default temporary-file directory. | ||
| 303 | * | ||
| 304 | * @see #setCacheDirectory | ||
| 305 | */ | ||
| 306 | public static File getCacheDirectory() { | ||
| 307 | return getCacheInfo().getCacheDirectory(); | ||
| 308 | } | ||
| 309 | |||
| 310 | /** | ||
| 311 | * Returns an <code>ImageInputStream</code> that will take its | ||
| 312 | * input from the given <code>Object</code>. The set of | ||
| 313 | * <code>ImageInputStreamSpi</code>s registered with the | ||
| 314 | * <code>IIORegistry</code> class is queried and the first one | ||
| 315 | * that is able to take input from the supplied object is used to | ||
| 316 | * create the returned <code>ImageInputStream</code>. If no | ||
| 317 | * suitable <code>ImageInputStreamSpi</code> exists, | ||
| 318 | * <code>null</code> is returned. | ||
| 319 | * | ||
| 320 | * <p> The current cache settings from <code>getUseCache</code>and | ||
| 321 | * <code>getCacheDirectory</code> will be used to control caching. | ||
| 322 | * | ||
| 323 | * @param input an <code>Object</code> to be used as an input | ||
| 324 | * source, such as a <code>File</code>, readable | ||
| 325 | * <code>RandomAccessFile</code>, or <code>InputStream</code>. | ||
| 326 | * | ||
| 327 | * @return an <code>ImageInputStream</code>, or <code>null</code>. | ||
| 328 | * | ||
| 329 | * @exception IllegalArgumentException if <code>input</code> | ||
| 330 | * is <code>null</code>. | ||
| 331 | * @exception IOException if a cache file is needed but cannot be | ||
| 332 | * created. | ||
| 333 | * | ||
| 334 | * @see javax.imageio.spi.ImageInputStreamSpi | ||
| 335 | */ | ||
| 336 | public static ImageInputStream createImageInputStream(Object input) | ||
| 337 | throws IOException { | ||
| 338 | if (input == null) { | ||
| 339 | throw new IllegalArgumentException("input == null!"); | ||
| 340 | } | ||
| 341 | |||
| 342 | Iterator iter; | ||
| 343 | // Ensure category is present | ||
| 344 | try { | ||
| 345 | iter = theRegistry.getServiceProviders(ImageInputStreamSpi.class, | ||
| 346 | true); | ||
| 347 | } catch (IllegalArgumentException e) { | ||
| 348 | return null; | ||
| 349 | } | ||
| 350 | |||
| 351 | boolean usecache = getUseCache() && hasCachePermission(); | ||
| 352 | |||
| 353 | while (iter.hasNext()) { | ||
| 354 | ImageInputStreamSpi spi = (ImageInputStreamSpi)iter.next(); | ||
| 355 | if (spi.getInputClass().isInstance(input)) { | ||
| 356 | try { | ||
| 357 | return spi.createInputStreamInstance(input, | ||
| 358 | usecache, | ||
| 359 | getCacheDirectory()); | ||
| 360 | } catch (IOException e) { | ||
| 361 | throw new IIOException("Can't create cache file!", e); | ||
| 362 | } | ||
| 363 | } | ||
| 364 | } | ||
| 365 | |||
| 366 | return null; | ||
| 367 | } | ||
| 368 | |||
| 369 | // ImageOutputStreams | ||
| 370 | |||
| 371 | /** | ||
| 372 | * Returns an <code>ImageOutputStream</code> that will send its | ||
| 373 | * output to the given <code>Object</code>. The set of | ||
| 374 | * <code>ImageOutputStreamSpi</code>s registered with the | ||
| 375 | * <code>IIORegistry</code> class is queried and the first one | ||
| 376 | * that is able to send output from the supplied object is used to | ||
| 377 | * create the returned <code>ImageOutputStream</code>. If no | ||
| 378 | * suitable <code>ImageOutputStreamSpi</code> exists, | ||
| 379 | * <code>null</code> is returned. | ||
| 380 | * | ||
| 381 | * <p> The current cache settings from <code>getUseCache</code>and | ||
| 382 | * <code>getCacheDirectory</code> will be used to control caching. | ||
| 383 | * | ||
| 384 | * @param output an <code>Object</code> to be used as an output | ||
| 385 | * destination, such as a <code>File</code>, writable | ||
| 386 | * <code>RandomAccessFile</code>, or <code>OutputStream</code>. | ||
| 387 | * | ||
| 388 | * @return an <code>ImageOutputStream</code>, or | ||
| 389 | * <code>null</code>. | ||
| 390 | * | ||
| 391 | * @exception IllegalArgumentException if <code>output</code> is | ||
| 392 | * <code>null</code>. | ||
| 393 | * @exception IOException if a cache file is needed but cannot be | ||
| 394 | * created. | ||
| 395 | * | ||
| 396 | * @see javax.imageio.spi.ImageOutputStreamSpi | ||
| 397 | */ | ||
| 398 | public static ImageOutputStream createImageOutputStream(Object output) | ||
| 399 | throws IOException { | ||
| 400 | if (output == null) { | ||
| 401 | throw new IllegalArgumentException("output == null!"); | ||
| 402 | } | ||
| 403 | |||
| 404 | Iterator iter; | ||
| 405 | // Ensure category is present | ||
| 406 | try { | ||
| 407 | iter = theRegistry.getServiceProviders(ImageOutputStreamSpi.class, | ||
| 408 | true); | ||
| 409 | } catch (IllegalArgumentException e) { | ||
| 410 | return null; | ||
| 411 | } | ||
| 412 | |||
| 413 | boolean usecache = getUseCache() && hasCachePermission(); | ||
| 414 | |||
| 415 | while (iter.hasNext()) { | ||
| 416 | ImageOutputStreamSpi spi = (ImageOutputStreamSpi)iter.next(); | ||
| 417 | if (spi.getOutputClass().isInstance(output)) { | ||
| 418 | try { | ||
| 419 | return spi.createOutputStreamInstance(output, | ||
| 420 | usecache, | ||
| 421 | getCacheDirectory()); | ||
| 422 | } catch (IOException e) { | ||
| 423 | throw new IIOException("Can't create cache file!", e); | ||
| 424 | } | ||
| 425 | } | ||
| 426 | } | ||
| 427 | |||
| 428 | return null; | ||
| 429 | } | ||
| 430 | |||
| 431 | private static enum SpiInfo { | ||
| 432 | FORMAT_NAMES { | ||
| 433 | @Override | ||
| 434 | String[] info(ImageReaderWriterSpi spi) { | ||
| 435 | return spi.getFormatNames(); | ||
| 436 | } | ||
| 437 | }, | ||
| 438 | MIME_TYPES { | ||
| 439 | @Override | ||
| 440 | String[] info(ImageReaderWriterSpi spi) { | ||
| 441 | return spi.getMIMETypes(); | ||
| 442 | } | ||
| 443 | }, | ||
| 444 | FILE_SUFFIXES { | ||
| 445 | @Override | ||
| 446 | String[] info(ImageReaderWriterSpi spi) { | ||
| 447 | return spi.getFileSuffixes(); | ||
| 448 | } | ||
| 449 | }; | ||
| 450 | |||
| 451 | abstract String[] info(ImageReaderWriterSpi spi); | ||
| 452 | } | ||
| 453 | |||
| 454 | private static <S extends ImageReaderWriterSpi> | ||
| 455 | String[] getReaderWriterInfo(Class<S> spiClass, SpiInfo spiInfo) | ||
| 456 | { | ||
| 457 | // Ensure category is present | ||
| 458 | Iterator<S> iter; | ||
| 459 | try { | ||
| 460 | iter = theRegistry.getServiceProviders(spiClass, true); | ||
| 461 | } catch (IllegalArgumentException e) { | ||
| 462 | return new String[0]; | ||
| 463 | } | ||
| 464 | |||
| 465 | HashSet<String> s = new HashSet<String>(); | ||
| 466 | while (iter.hasNext()) { | ||
| 467 | ImageReaderWriterSpi spi = iter.next(); | ||
| 468 | Collections.addAll(s, spiInfo.info(spi)); | ||
| 469 | } | ||
| 470 | |||
| 471 | return s.toArray(new String[s.size()]); | ||
| 472 | } | ||
| 473 | |||
| 474 | // Readers | ||
| 475 | |||
| 476 | /** | ||
| 477 | * Returns an array of <code>String</code>s listing all of the | ||
| 478 | * informal format names understood by the current set of registered | ||
| 479 | * readers. | ||
| 480 | * | ||
| 481 | * @return an array of <code>String</code>s. | ||
| 482 | */ | ||
| 483 | public static String[] getReaderFormatNames() { | ||
| 484 | return getReaderWriterInfo(ImageReaderSpi.class, | ||
| 485 | SpiInfo.FORMAT_NAMES); | ||
| 486 | } | ||
| 487 | |||
| 488 | /** | ||
| 489 | * Returns an array of <code>String</code>s listing all of the | ||
| 490 | * MIME types understood by the current set of registered | ||
| 491 | * readers. | ||
| 492 | * | ||
| 493 | * @return an array of <code>String</code>s. | ||
| 494 | */ | ||
| 495 | public static String[] getReaderMIMETypes() { | ||
| 496 | return getReaderWriterInfo(ImageReaderSpi.class, | ||
| 497 | SpiInfo.MIME_TYPES); | ||
| 498 | } | ||
| 499 | |||
| 500 | /** | ||
| 501 | * Returns an array of <code>String</code>s listing all of the | ||
| 502 | * file suffixes associated with the formats understood | ||
| 503 | * by the current set of registered readers. | ||
| 504 | * | ||
| 505 | * @return an array of <code>String</code>s. | ||
| 506 | * @since 1.6 | ||
| 507 | */ | ||
| 508 | public static String[] getReaderFileSuffixes() { | ||
| 509 | return getReaderWriterInfo(ImageReaderSpi.class, | ||
| 510 | SpiInfo.FILE_SUFFIXES); | ||
| 511 | } | ||
| 512 | |||
| 513 | static class ImageReaderIterator implements Iterator<ImageReader> { | ||
| 514 | // Contains ImageReaderSpis | ||
| 515 | public Iterator iter; | ||
| 516 | |||
| 517 | public ImageReaderIterator(Iterator iter) { | ||
| 518 | this.iter = iter; | ||
| 519 | } | ||
| 520 | |||
| 521 | public boolean hasNext() { | ||
| 522 | return iter.hasNext(); | ||
| 523 | } | ||
| 524 | |||
| 525 | public ImageReader next() { | ||
| 526 | ImageReaderSpi spi = null; | ||
| 527 | try { | ||
| 528 | spi = (ImageReaderSpi)iter.next(); | ||
| 529 | return spi.createReaderInstance(); | ||
| 530 | } catch (IOException e) { | ||
| 531 | // Deregister the spi in this case, but only as | ||
| 532 | // an ImageReaderSpi | ||
| 533 | theRegistry.deregisterServiceProvider(spi, ImageReaderSpi.class); | ||
| 534 | } | ||
| 535 | return null; | ||
| 536 | } | ||
| 537 | |||
| 538 | public void remove() { | ||
| 539 | throw new UnsupportedOperationException(); | ||
| 540 | } | ||
| 541 | } | ||
| 542 | |||
| 543 | static class CanDecodeInputFilter | ||
| 544 | implements ServiceRegistry.Filter { | ||
| 545 | |||
| 546 | Object input; | ||
| 547 | |||
| 548 | public CanDecodeInputFilter(Object input) { | ||
| 549 | this.input = input; | ||
| 550 | } | ||
| 551 | |||
| 552 | public boolean filter(Object elt) { | ||
| 553 | try { | ||
| 554 | ImageReaderSpi spi = (ImageReaderSpi)elt; | ||
| 555 | ImageInputStream stream = null; | ||
| 556 | if (input instanceof ImageInputStream) { | ||
| 557 | stream = (ImageInputStream)input; | ||
| 558 | } | ||
| 559 | |||
| 560 | // Perform mark/reset as a defensive measure | ||
| 561 | // even though plug-ins are supposed to take | ||
| 562 | // care of it. | ||
| 563 | boolean canDecode = false; | ||
| 564 | if (stream != null) { | ||
| 565 | stream.mark(); | ||
| 566 | } | ||
| 567 | canDecode = spi.canDecodeInput(input); | ||
| 568 | if (stream != null) { | ||
| 569 | stream.reset(); | ||
| 570 | } | ||
| 571 | |||
| 572 | return canDecode; | ||
| 573 | } catch (IOException e) { | ||
| 574 | return false; | ||
| 575 | } | ||
| 576 | } | ||
| 577 | } | ||
| 578 | |||
| 579 | static class CanEncodeImageAndFormatFilter | ||
| 580 | implements ServiceRegistry.Filter { | ||
| 581 | |||
| 582 | ImageTypeSpecifier type; | ||
| 583 | String formatName; | ||
| 584 | |||
| 585 | public CanEncodeImageAndFormatFilter(ImageTypeSpecifier type, | ||
| 586 | String formatName) { | ||
| 587 | this.type = type; | ||
| 588 | this.formatName = formatName; | ||
| 589 | } | ||
| 590 | |||
| 591 | public boolean filter(Object elt) { | ||
| 592 | ImageWriterSpi spi = (ImageWriterSpi)elt; | ||
| 593 | return Arrays.asList(spi.getFormatNames()).contains(formatName) && | ||
| 594 | spi.canEncodeImage(type); | ||
| 595 | } | ||
| 596 | } | ||
| 597 | |||
| 598 | static class ContainsFilter | ||
| 599 | implements ServiceRegistry.Filter { | ||
| 600 | |||
| 601 | Method method; | ||
| 602 | String name; | ||
| 603 | |||
| 604 | // method returns an array of Strings | ||
| 605 | public ContainsFilter(Method method, | ||
| 606 | String name) { | ||
| 607 | this.method = method; | ||
| 608 | this.name = name; | ||
| 609 | } | ||
| 610 | |||
| 611 | public boolean filter(Object elt) { | ||
| 612 | try { | ||
| 613 | return contains((String[])method.invoke(elt), name); | ||
| 614 | } catch (Exception e) { | ||
| 615 | return false; | ||
| 616 | } | ||
| 617 | } | ||
| 618 | } | ||
| 619 | |||
| 620 | /** | ||
| 621 | * Returns an <code>Iterator</code> containing all currently | ||
| 622 | * registered <code>ImageReader</code>s that claim to be able to | ||
| 623 | * decode the supplied <code>Object</code>, typically an | ||
| 624 | * <code>ImageInputStream</code>. | ||
| 625 | * | ||
| 626 | * <p> The stream position is left at its prior position upon | ||
| 627 | * exit from this method. | ||
| 628 | * | ||
| 629 | * @param input an <code>ImageInputStream</code> or other | ||
| 630 | * <code>Object</code> containing encoded image data. | ||
| 631 | * | ||
| 632 | * @return an <code>Iterator</code> containing <code>ImageReader</code>s. | ||
| 633 | * | ||
| 634 | * @exception IllegalArgumentException if <code>input</code> is | ||
| 635 | * <code>null</code>. | ||
| 636 | * | ||
| 637 | * @see javax.imageio.spi.ImageReaderSpi#canDecodeInput | ||
| 638 | */ | ||
| 639 | public static Iterator<ImageReader> getImageReaders(Object input) { | ||
| 640 | if (input == null) { | ||
| 641 | throw new IllegalArgumentException("input == null!"); | ||
| 642 | } | ||
| 643 | Iterator iter; | ||
| 644 | // Ensure category is present | ||
| 645 | try { | ||
| 646 | iter = theRegistry.getServiceProviders(ImageReaderSpi.class, | ||
| 647 | new CanDecodeInputFilter(input), | ||
| 648 | true); | ||
| 649 | } catch (IllegalArgumentException e) { | ||
| 650 | return Collections.emptyIterator(); | ||
| 651 | } | ||
| 652 | |||
| 653 | return new ImageReaderIterator(iter); | ||
| 654 | } | ||
| 655 | |||
| 656 | private static Method readerFormatNamesMethod; | ||
| 657 | private static Method readerFileSuffixesMethod; | ||
| 658 | private static Method readerMIMETypesMethod; | ||
| 659 | private static Method writerFormatNamesMethod; | ||
| 660 | private static Method writerFileSuffixesMethod; | ||
| 661 | private static Method writerMIMETypesMethod; | ||
| 662 | |||
| 663 | static { | ||
| 664 | try { | ||
| 665 | readerFormatNamesMethod = | ||
| 666 | ImageReaderSpi.class.getMethod("getFormatNames"); | ||
| 667 | readerFileSuffixesMethod = | ||
| 668 | ImageReaderSpi.class.getMethod("getFileSuffixes"); | ||
| 669 | readerMIMETypesMethod = | ||
| 670 | ImageReaderSpi.class.getMethod("getMIMETypes"); | ||
| 671 | |||
| 672 | writerFormatNamesMethod = | ||
| 673 | ImageWriterSpi.class.getMethod("getFormatNames"); | ||
| 674 | writerFileSuffixesMethod = | ||
| 675 | ImageWriterSpi.class.getMethod("getFileSuffixes"); | ||
| 676 | writerMIMETypesMethod = | ||
| 677 | ImageWriterSpi.class.getMethod("getMIMETypes"); | ||
| 678 | } catch (NoSuchMethodException e) { | ||
| 679 | e.printStackTrace(); | ||
| 680 | } | ||
| 681 | } | ||
| 682 | |||
| 683 | /** | ||
| 684 | * Returns an <code>Iterator</code> containing all currently | ||
| 685 | * registered <code>ImageReader</code>s that claim to be able to | ||
| 686 | * decode the named format. | ||
| 687 | * | ||
| 688 | * @param formatName a <code>String</code> containing the informal | ||
| 689 | * name of a format (<i>e.g.</i>, "jpeg" or "tiff". | ||
| 690 | * | ||
| 691 | * @return an <code>Iterator</code> containing | ||
| 692 | * <code>ImageReader</code>s. | ||
| 693 | * | ||
| 694 | * @exception IllegalArgumentException if <code>formatName</code> | ||
| 695 | * is <code>null</code>. | ||
| 696 | * | ||
| 697 | * @see javax.imageio.spi.ImageReaderSpi#getFormatNames | ||
| 698 | */ | ||
| 699 | public static Iterator<ImageReader> | ||
| 700 | getImageReadersByFormatName(String formatName) | ||
| 701 | { | ||
| 702 | if (formatName == null) { | ||
| 703 | throw new IllegalArgumentException("formatName == null!"); | ||
| 704 | } | ||
| 705 | Iterator iter; | ||
| 706 | // Ensure category is present | ||
| 707 | try { | ||
| 708 | iter = theRegistry.getServiceProviders(ImageReaderSpi.class, | ||
| 709 | new ContainsFilter(readerFormatNamesMethod, | ||
| 710 | formatName), | ||
| 711 | true); | ||
| 712 | } catch (IllegalArgumentException e) { | ||
| 713 | return Collections.emptyIterator(); | ||
| 714 | } | ||
| 715 | return new ImageReaderIterator(iter); | ||
| 716 | } | ||
| 717 | |||
| 718 | /** | ||
| 719 | * Returns an <code>Iterator</code> containing all currently | ||
| 720 | * registered <code>ImageReader</code>s that claim to be able to | ||
| 721 | * decode files with the given suffix. | ||
| 722 | * | ||
| 723 | * @param fileSuffix a <code>String</code> containing a file | ||
| 724 | * suffix (<i>e.g.</i>, "jpg" or "tiff"). | ||
| 725 | * | ||
| 726 | * @return an <code>Iterator</code> containing | ||
| 727 | * <code>ImageReader</code>s. | ||
| 728 | * | ||
| 729 | * @exception IllegalArgumentException if <code>fileSuffix</code> | ||
| 730 | * is <code>null</code>. | ||
| 731 | * | ||
| 732 | * @see javax.imageio.spi.ImageReaderSpi#getFileSuffixes | ||
| 733 | */ | ||
| 734 | public static Iterator<ImageReader> | ||
| 735 | getImageReadersBySuffix(String fileSuffix) | ||
| 736 | { | ||
| 737 | if (fileSuffix == null) { | ||
| 738 | throw new IllegalArgumentException("fileSuffix == null!"); | ||
| 739 | } | ||
| 740 | // Ensure category is present | ||
| 741 | Iterator iter; | ||
| 742 | try { | ||
| 743 | iter = theRegistry.getServiceProviders(ImageReaderSpi.class, | ||
| 744 | new ContainsFilter(readerFileSuffixesMethod, | ||
| 745 | fileSuffix), | ||
| 746 | true); | ||
| 747 | } catch (IllegalArgumentException e) { | ||
| 748 | return Collections.emptyIterator(); | ||
| 749 | } | ||
| 750 | return new ImageReaderIterator(iter); | ||
| 751 | } | ||
| 752 | |||
| 753 | /** | ||
| 754 | * Returns an <code>Iterator</code> containing all currently | ||
| 755 | * registered <code>ImageReader</code>s that claim to be able to | ||
| 756 | * decode files with the given MIME type. | ||
| 757 | * | ||
| 758 | * @param MIMEType a <code>String</code> containing a file | ||
| 759 | * suffix (<i>e.g.</i>, "image/jpeg" or "image/x-bmp"). | ||
| 760 | * | ||
| 761 | * @return an <code>Iterator</code> containing | ||
| 762 | * <code>ImageReader</code>s. | ||
| 763 | * | ||
| 764 | * @exception IllegalArgumentException if <code>MIMEType</code> is | ||
| 765 | * <code>null</code>. | ||
| 766 | * | ||
| 767 | * @see javax.imageio.spi.ImageReaderSpi#getMIMETypes | ||
| 768 | */ | ||
| 769 | public static Iterator<ImageReader> | ||
| 770 | getImageReadersByMIMEType(String MIMEType) | ||
| 771 | { | ||
| 772 | if (MIMEType == null) { | ||
| 773 | throw new IllegalArgumentException("MIMEType == null!"); | ||
| 774 | } | ||
| 775 | // Ensure category is present | ||
| 776 | Iterator iter; | ||
| 777 | try { | ||
| 778 | iter = theRegistry.getServiceProviders(ImageReaderSpi.class, | ||
| 779 | new ContainsFilter(readerMIMETypesMethod, | ||
| 780 | MIMEType), | ||
| 781 | true); | ||
| 782 | } catch (IllegalArgumentException e) { | ||
| 783 | return Collections.emptyIterator(); | ||
| 784 | } | ||
| 785 | return new ImageReaderIterator(iter); | ||
| 786 | } | ||
| 787 | |||
| 788 | // Writers | ||
| 789 | |||
| 790 | /** | ||
| 791 | * Returns an array of <code>String</code>s listing all of the | ||
| 792 | * informal format names understood by the current set of registered | ||
| 793 | * writers. | ||
| 794 | * | ||
| 795 | * @return an array of <code>String</code>s. | ||
| 796 | */ | ||
| 797 | public static String[] getWriterFormatNames() { | ||
| 798 | return getReaderWriterInfo(ImageWriterSpi.class, | ||
| 799 | SpiInfo.FORMAT_NAMES); | ||
| 800 | } | ||
| 801 | |||
| 802 | /** | ||
| 803 | * Returns an array of <code>String</code>s listing all of the | ||
| 804 | * MIME types understood by the current set of registered | ||
| 805 | * writers. | ||
| 806 | * | ||
| 807 | * @return an array of <code>String</code>s. | ||
| 808 | */ | ||
| 809 | public static String[] getWriterMIMETypes() { | ||
| 810 | return getReaderWriterInfo(ImageWriterSpi.class, | ||
| 811 | SpiInfo.MIME_TYPES); | ||
| 812 | } | ||
| 813 | |||
| 814 | /** | ||
| 815 | * Returns an array of <code>String</code>s listing all of the | ||
| 816 | * file suffixes associated with the formats understood | ||
| 817 | * by the current set of registered writers. | ||
| 818 | * | ||
| 819 | * @return an array of <code>String</code>s. | ||
| 820 | * @since 1.6 | ||
| 821 | */ | ||
| 822 | public static String[] getWriterFileSuffixes() { | ||
| 823 | return getReaderWriterInfo(ImageWriterSpi.class, | ||
| 824 | SpiInfo.FILE_SUFFIXES); | ||
| 825 | } | ||
| 826 | |||
| 827 | static class ImageWriterIterator implements Iterator<ImageWriter> { | ||
| 828 | // Contains ImageWriterSpis | ||
| 829 | public Iterator iter; | ||
| 830 | |||
| 831 | public ImageWriterIterator(Iterator iter) { | ||
| 832 | this.iter = iter; | ||
| 833 | } | ||
| 834 | |||
| 835 | public boolean hasNext() { | ||
| 836 | return iter.hasNext(); | ||
| 837 | } | ||
| 838 | |||
| 839 | public ImageWriter next() { | ||
| 840 | ImageWriterSpi spi = null; | ||
| 841 | try { | ||
| 842 | spi = (ImageWriterSpi)iter.next(); | ||
| 843 | return spi.createWriterInstance(); | ||
| 844 | } catch (IOException e) { | ||
| 845 | // Deregister the spi in this case, but only as a writerSpi | ||
| 846 | theRegistry.deregisterServiceProvider(spi, ImageWriterSpi.class); | ||
| 847 | } | ||
| 848 | return null; | ||
| 849 | } | ||
| 850 | |||
| 851 | public void remove() { | ||
| 852 | throw new UnsupportedOperationException(); | ||
| 853 | } | ||
| 854 | } | ||
| 855 | |||
| 856 | private static boolean contains(String[] names, String name) { | ||
| 857 | for (int i = 0; i < names.length; i++) { | ||
| 858 | if (name.equalsIgnoreCase(names[i])) { | ||
| 859 | return true; | ||
| 860 | } | ||
| 861 | } | ||
| 862 | |||
| 863 | return false; | ||
| 864 | } | ||
| 865 | |||
| 866 | /** | ||
| 867 | * Returns an <code>Iterator</code> containing all currently | ||
| 868 | * registered <code>ImageWriter</code>s that claim to be able to | ||
| 869 | * encode the named format. | ||
| 870 | * | ||
| 871 | * @param formatName a <code>String</code> containing the informal | ||
| 872 | * name of a format (<i>e.g.</i>, "jpeg" or "tiff". | ||
| 873 | * | ||
| 874 | * @return an <code>Iterator</code> containing | ||
| 875 | * <code>ImageWriter</code>s. | ||
| 876 | * | ||
| 877 | * @exception IllegalArgumentException if <code>formatName</code> is | ||
| 878 | * <code>null</code>. | ||
| 879 | * | ||
| 880 | * @see javax.imageio.spi.ImageWriterSpi#getFormatNames | ||
| 881 | */ | ||
| 882 | public static Iterator<ImageWriter> | ||
| 883 | getImageWritersByFormatName(String formatName) | ||
| 884 | { | ||
| 885 | if (formatName == null) { | ||
| 886 | throw new IllegalArgumentException("formatName == null!"); | ||
| 887 | } | ||
| 888 | Iterator iter; | ||
| 889 | // Ensure category is present | ||
| 890 | try { | ||
| 891 | iter = theRegistry.getServiceProviders(ImageWriterSpi.class, | ||
| 892 | new ContainsFilter(writerFormatNamesMethod, | ||
| 893 | formatName), | ||
| 894 | true); | ||
| 895 | } catch (IllegalArgumentException e) { | ||
| 896 | return Collections.emptyIterator(); | ||
| 897 | } | ||
| 898 | return new ImageWriterIterator(iter); | ||
| 899 | } | ||
| 900 | |||
| 901 | /** | ||
| 902 | * Returns an <code>Iterator</code> containing all currently | ||
| 903 | * registered <code>ImageWriter</code>s that claim to be able to | ||
| 904 | * encode files with the given suffix. | ||
| 905 | * | ||
| 906 | * @param fileSuffix a <code>String</code> containing a file | ||
| 907 | * suffix (<i>e.g.</i>, "jpg" or "tiff"). | ||
| 908 | * | ||
| 909 | * @return an <code>Iterator</code> containing <code>ImageWriter</code>s. | ||
| 910 | * | ||
| 911 | * @exception IllegalArgumentException if <code>fileSuffix</code> is | ||
| 912 | * <code>null</code>. | ||
| 913 | * | ||
| 914 | * @see javax.imageio.spi.ImageWriterSpi#getFileSuffixes | ||
| 915 | */ | ||
| 916 | public static Iterator<ImageWriter> | ||
| 917 | getImageWritersBySuffix(String fileSuffix) | ||
| 918 | { | ||
| 919 | if (fileSuffix == null) { | ||
| 920 | throw new IllegalArgumentException("fileSuffix == null!"); | ||
| 921 | } | ||
| 922 | Iterator iter; | ||
| 923 | // Ensure category is present | ||
| 924 | try { | ||
| 925 | iter = theRegistry.getServiceProviders(ImageWriterSpi.class, | ||
| 926 | new ContainsFilter(writerFileSuffixesMethod, | ||
| 927 | fileSuffix), | ||
| 928 | true); | ||
| 929 | } catch (IllegalArgumentException e) { | ||
| 930 | return Collections.emptyIterator(); | ||
| 931 | } | ||
| 932 | return new ImageWriterIterator(iter); | ||
| 933 | } | ||
| 934 | |||
| 935 | /** | ||
| 936 | * Returns an <code>Iterator</code> containing all currently | ||
| 937 | * registered <code>ImageWriter</code>s that claim to be able to | ||
| 938 | * encode files with the given MIME type. | ||
| 939 | * | ||
| 940 | * @param MIMEType a <code>String</code> containing a file | ||
| 941 | * suffix (<i>e.g.</i>, "image/jpeg" or "image/x-bmp"). | ||
| 942 | * | ||
| 943 | * @return an <code>Iterator</code> containing <code>ImageWriter</code>s. | ||
| 944 | * | ||
| 945 | * @exception IllegalArgumentException if <code>MIMEType</code> is | ||
| 946 | * <code>null</code>. | ||
| 947 | * | ||
| 948 | * @see javax.imageio.spi.ImageWriterSpi#getMIMETypes | ||
| 949 | */ | ||
| 950 | public static Iterator<ImageWriter> | ||
| 951 | getImageWritersByMIMEType(String MIMEType) | ||
| 952 | { | ||
| 953 | if (MIMEType == null) { | ||
| 954 | throw new IllegalArgumentException("MIMEType == null!"); | ||
| 955 | } | ||
| 956 | Iterator iter; | ||
| 957 | // Ensure category is present | ||
| 958 | try { | ||
| 959 | iter = theRegistry.getServiceProviders(ImageWriterSpi.class, | ||
| 960 | new ContainsFilter(writerMIMETypesMethod, | ||
| 961 | MIMEType), | ||
| 962 | true); | ||
| 963 | } catch (IllegalArgumentException e) { | ||
| 964 | return Collections.emptyIterator(); | ||
| 965 | } | ||
| 966 | return new ImageWriterIterator(iter); | ||
| 967 | } | ||
| 968 | |||
| 969 | /** | ||
| 970 | * Returns an <code>ImageWriter</code>corresponding to the given | ||
| 971 | * <code>ImageReader</code>, if there is one, or <code>null</code> | ||
| 972 | * if the plug-in for this <code>ImageReader</code> does not | ||
| 973 | * specify a corresponding <code>ImageWriter</code>, or if the | ||
| 974 | * given <code>ImageReader</code> is not registered. This | ||
| 975 | * mechanism may be used to obtain an <code>ImageWriter</code> | ||
| 976 | * that will understand the internal structure of non-pixel | ||
| 977 | * metadata (as encoded by <code>IIOMetadata</code> objects) | ||
| 978 | * generated by the <code>ImageReader</code>. By obtaining this | ||
| 979 | * data from the <code>ImageReader</code> and passing it on to the | ||
| 980 | * <code>ImageWriter</code> obtained with this method, a client | ||
| 981 | * program can read an image, modify it in some way, and write it | ||
| 982 | * back out preserving all metadata, without having to understand | ||
| 983 | * anything about the structure of the metadata, or even about | ||
| 984 | * the image format. Note that this method returns the | ||
| 985 | * "preferred" writer, which is the first in the list returned by | ||
| 986 | * <code>javax.imageio.spi.ImageReaderSpi.getImageWriterSpiNames()</code>. | ||
| 987 | * | ||
| 988 | * @param reader an instance of a registered <code>ImageReader</code>. | ||
| 989 | * | ||
| 990 | * @return an <code>ImageWriter</code>, or null. | ||
| 991 | * | ||
| 992 | * @exception IllegalArgumentException if <code>reader</code> is | ||
| 993 | * <code>null</code>. | ||
| 994 | * | ||
| 995 | * @see #getImageReader(ImageWriter) | ||
| 996 | * @see javax.imageio.spi.ImageReaderSpi#getImageWriterSpiNames() | ||
| 997 | */ | ||
| 998 | public static ImageWriter getImageWriter(ImageReader reader) { | ||
| 999 | if (reader == null) { | ||
| 1000 | throw new IllegalArgumentException("reader == null!"); | ||
| 1001 | } | ||
| 1002 | |||
| 1003 | ImageReaderSpi readerSpi = reader.getOriginatingProvider(); | ||
| 1004 | if (readerSpi == null) { | ||
| 1005 | Iterator readerSpiIter; | ||
| 1006 | // Ensure category is present | ||
| 1007 | try { | ||
| 1008 | readerSpiIter = | ||
| 1009 | theRegistry.getServiceProviders(ImageReaderSpi.class, | ||
| 1010 | false); | ||
| 1011 | } catch (IllegalArgumentException e) { | ||
| 1012 | return null; | ||
| 1013 | } | ||
| 1014 | |||
| 1015 | while (readerSpiIter.hasNext()) { | ||
| 1016 | ImageReaderSpi temp = (ImageReaderSpi) readerSpiIter.next(); | ||
| 1017 | if (temp.isOwnReader(reader)) { | ||
| 1018 | readerSpi = temp; | ||
| 1019 | break; | ||
| 1020 | } | ||
| 1021 | } | ||
| 1022 | if (readerSpi == null) { | ||
| 1023 | return null; | ||
| 1024 | } | ||
| 1025 | } | ||
| 1026 | |||
| 1027 | String[] writerNames = readerSpi.getImageWriterSpiNames(); | ||
| 1028 | if (writerNames == null) { | ||
| 1029 | return null; | ||
| 1030 | } | ||
| 1031 | |||
| 1032 | Class writerSpiClass = null; | ||
| 1033 | try { | ||
| 1034 | writerSpiClass = Class.forName(writerNames[0], true, | ||
| 1035 | ClassLoader.getSystemClassLoader()); | ||
| 1036 | } catch (ClassNotFoundException e) { | ||
| 1037 | return null; | ||
| 1038 | } | ||
| 1039 | |||
| 1040 | ImageWriterSpi writerSpi = (ImageWriterSpi) | ||
| 1041 | theRegistry.getServiceProviderByClass(writerSpiClass); | ||
| 1042 | if (writerSpi == null) { | ||
| 1043 | return null; | ||
| 1044 | } | ||
| 1045 | |||
| 1046 | try { | ||
| 1047 | return writerSpi.createWriterInstance(); | ||
| 1048 | } catch (IOException e) { | ||
| 1049 | // Deregister the spi in this case, but only as a writerSpi | ||
| 1050 | theRegistry.deregisterServiceProvider(writerSpi, | ||
| 1051 | ImageWriterSpi.class); | ||
| 1052 | return null; | ||
| 1053 | } | ||
| 1054 | } | ||
| 1055 | |||
| 1056 | /** | ||
| 1057 | * Returns an <code>ImageReader</code>corresponding to the given | ||
| 1058 | * <code>ImageWriter</code>, if there is one, or <code>null</code> | ||
| 1059 | * if the plug-in for this <code>ImageWriter</code> does not | ||
| 1060 | * specify a corresponding <code>ImageReader</code>, or if the | ||
| 1061 | * given <code>ImageWriter</code> is not registered. This method | ||
| 1062 | * is provided principally for symmetry with | ||
| 1063 | * <code>getImageWriter(ImageReader)</code>. Note that this | ||
| 1064 | * method returns the "preferred" reader, which is the first in | ||
| 1065 | * the list returned by | ||
| 1066 | * javax.imageio.spi.ImageWriterSpi.<code>getImageReaderSpiNames()</code>. | ||
| 1067 | * | ||
| 1068 | * @param writer an instance of a registered <code>ImageWriter</code>. | ||
| 1069 | * | ||
| 1070 | * @return an <code>ImageReader</code>, or null. | ||
| 1071 | * | ||
| 1072 | * @exception IllegalArgumentException if <code>writer</code> is | ||
| 1073 | * <code>null</code>. | ||
| 1074 | * | ||
| 1075 | * @see #getImageWriter(ImageReader) | ||
| 1076 | * @see javax.imageio.spi.ImageWriterSpi#getImageReaderSpiNames() | ||
| 1077 | */ | ||
| 1078 | public static ImageReader getImageReader(ImageWriter writer) { | ||
| 1079 | if (writer == null) { | ||
| 1080 | throw new IllegalArgumentException("writer == null!"); | ||
| 1081 | } | ||
| 1082 | |||
| 1083 | ImageWriterSpi writerSpi = writer.getOriginatingProvider(); | ||
| 1084 | if (writerSpi == null) { | ||
| 1085 | Iterator writerSpiIter; | ||
| 1086 | // Ensure category is present | ||
| 1087 | try { | ||
| 1088 | writerSpiIter = | ||
| 1089 | theRegistry.getServiceProviders(ImageWriterSpi.class, | ||
| 1090 | false); | ||
| 1091 | } catch (IllegalArgumentException e) { | ||
| 1092 | return null; | ||
| 1093 | } | ||
| 1094 | |||
| 1095 | while (writerSpiIter.hasNext()) { | ||
| 1096 | ImageWriterSpi temp = (ImageWriterSpi) writerSpiIter.next(); | ||
| 1097 | if (temp.isOwnWriter(writer)) { | ||
| 1098 | writerSpi = temp; | ||
| 1099 | break; | ||
| 1100 | } | ||
| 1101 | } | ||
| 1102 | if (writerSpi == null) { | ||
| 1103 | return null; | ||
| 1104 | } | ||
| 1105 | } | ||
| 1106 | |||
| 1107 | String[] readerNames = writerSpi.getImageReaderSpiNames(); | ||
| 1108 | if (readerNames == null) { | ||
| 1109 | return null; | ||
| 1110 | } | ||
| 1111 | |||
| 1112 | Class readerSpiClass = null; | ||
| 1113 | try { | ||
| 1114 | readerSpiClass = Class.forName(readerNames[0], true, | ||
| 1115 | ClassLoader.getSystemClassLoader()); | ||
| 1116 | } catch (ClassNotFoundException e) { | ||
| 1117 | return null; | ||
| 1118 | } | ||
| 1119 | |||
| 1120 | ImageReaderSpi readerSpi = (ImageReaderSpi) | ||
| 1121 | theRegistry.getServiceProviderByClass(readerSpiClass); | ||
| 1122 | if (readerSpi == null) { | ||
| 1123 | return null; | ||
| 1124 | } | ||
| 1125 | |||
| 1126 | try { | ||
| 1127 | return readerSpi.createReaderInstance(); | ||
| 1128 | } catch (IOException e) { | ||
| 1129 | // Deregister the spi in this case, but only as a readerSpi | ||
| 1130 | theRegistry.deregisterServiceProvider(readerSpi, | ||
| 1131 | ImageReaderSpi.class); | ||
| 1132 | return null; | ||
| 1133 | } | ||
| 1134 | } | ||
| 1135 | |||
| 1136 | /** | ||
| 1137 | * Returns an <code>Iterator</code> containing all currently | ||
| 1138 | * registered <code>ImageWriter</code>s that claim to be able to | ||
| 1139 | * encode images of the given layout (specified using an | ||
| 1140 | * <code>ImageTypeSpecifier</code>) in the given format. | ||
| 1141 | * | ||
| 1142 | * @param type an <code>ImageTypeSpecifier</code> indicating the | ||
| 1143 | * layout of the image to be written. | ||
| 1144 | * @param formatName the informal name of the <code>format</code>. | ||
| 1145 | * | ||
| 1146 | * @return an <code>Iterator</code> containing <code>ImageWriter</code>s. | ||
| 1147 | * | ||
| 1148 | * @exception IllegalArgumentException if any parameter is | ||
| 1149 | * <code>null</code>. | ||
| 1150 | * | ||
| 1151 | * @see javax.imageio.spi.ImageWriterSpi#canEncodeImage(ImageTypeSpecifier) | ||
| 1152 | */ | ||
| 1153 | public static Iterator<ImageWriter> | ||
| 1154 | getImageWriters(ImageTypeSpecifier type, String formatName) | ||
| 1155 | { | ||
| 1156 | if (type == null) { | ||
| 1157 | throw new IllegalArgumentException("type == null!"); | ||
| 1158 | } | ||
| 1159 | if (formatName == null) { | ||
| 1160 | throw new IllegalArgumentException("formatName == null!"); | ||
| 1161 | } | ||
| 1162 | |||
| 1163 | Iterator iter; | ||
| 1164 | // Ensure category is present | ||
| 1165 | try { | ||
| 1166 | iter = theRegistry.getServiceProviders(ImageWriterSpi.class, | ||
| 1167 | new CanEncodeImageAndFormatFilter(type, | ||
| 1168 | formatName), | ||
| 1169 | true); | ||
| 1170 | } catch (IllegalArgumentException e) { | ||
| 1171 | return Collections.emptyIterator(); | ||
| 1172 | } | ||
| 1173 | |||
| 1174 | return new ImageWriterIterator(iter); | ||
| 1175 | } | ||
| 1176 | |||
| 1177 | static class ImageTranscoderIterator | ||
| 1178 | implements Iterator<ImageTranscoder> | ||
| 1179 | { | ||
| 1180 | // Contains ImageTranscoderSpis | ||
| 1181 | public Iterator iter; | ||
| 1182 | |||
| 1183 | public ImageTranscoderIterator(Iterator iter) { | ||
| 1184 | this.iter = iter; | ||
| 1185 | } | ||
| 1186 | |||
| 1187 | public boolean hasNext() { | ||
| 1188 | return iter.hasNext(); | ||
| 1189 | } | ||
| 1190 | |||
| 1191 | public ImageTranscoder next() { | ||
| 1192 | ImageTranscoderSpi spi = null; | ||
| 1193 | spi = (ImageTranscoderSpi)iter.next(); | ||
| 1194 | return spi.createTranscoderInstance(); | ||
| 1195 | } | ||
| 1196 | |||
| 1197 | public void remove() { | ||
| 1198 | throw new UnsupportedOperationException(); | ||
| 1199 | } | ||
| 1200 | } | ||
| 1201 | |||
| 1202 | static class TranscoderFilter | ||
| 1203 | implements ServiceRegistry.Filter { | ||
| 1204 | |||
| 1205 | String readerSpiName; | ||
| 1206 | String writerSpiName; | ||
| 1207 | |||
| 1208 | public TranscoderFilter(ImageReaderSpi readerSpi, | ||
| 1209 | ImageWriterSpi writerSpi) { | ||
| 1210 | this.readerSpiName = readerSpi.getClass().getName(); | ||
| 1211 | this.writerSpiName = writerSpi.getClass().getName(); | ||
| 1212 | } | ||
| 1213 | |||
| 1214 | public boolean filter(Object elt) { | ||
| 1215 | ImageTranscoderSpi spi = (ImageTranscoderSpi)elt; | ||
| 1216 | String readerName = spi.getReaderServiceProviderName(); | ||
| 1217 | String writerName = spi.getWriterServiceProviderName(); | ||
| 1218 | return (readerName.equals(readerSpiName) && | ||
| 1219 | writerName.equals(writerSpiName)); | ||
| 1220 | } | ||
| 1221 | } | ||
| 1222 | |||
| 1223 | /** | ||
| 1224 | * Returns an <code>Iterator</code> containing all currently | ||
| 1225 | * registered <code>ImageTranscoder</code>s that claim to be | ||
| 1226 | * able to transcode between the metadata of the given | ||
| 1227 | * <code>ImageReader</code> and <code>ImageWriter</code>. | ||
| 1228 | * | ||
| 1229 | * @param reader an <code>ImageReader</code>. | ||
| 1230 | * @param writer an <code>ImageWriter</code>. | ||
| 1231 | * | ||
| 1232 | * @return an <code>Iterator</code> containing | ||
| 1233 | * <code>ImageTranscoder</code>s. | ||
| 1234 | * | ||
| 1235 | * @exception IllegalArgumentException if <code>reader</code> or | ||
| 1236 | * <code>writer</code> is <code>null</code>. | ||
| 1237 | */ | ||
| 1238 | public static Iterator<ImageTranscoder> | ||
| 1239 | getImageTranscoders(ImageReader reader, ImageWriter writer) | ||
| 1240 | { | ||
| 1241 | if (reader == null) { | ||
| 1242 | throw new IllegalArgumentException("reader == null!"); | ||
| 1243 | } | ||
| 1244 | if (writer == null) { | ||
| 1245 | throw new IllegalArgumentException("writer == null!"); | ||
| 1246 | } | ||
| 1247 | ImageReaderSpi readerSpi = reader.getOriginatingProvider(); | ||
| 1248 | ImageWriterSpi writerSpi = writer.getOriginatingProvider(); | ||
| 1249 | ServiceRegistry.Filter filter = | ||
| 1250 | new TranscoderFilter(readerSpi, writerSpi); | ||
| 1251 | |||
| 1252 | Iterator iter; | ||
| 1253 | // Ensure category is present | ||
| 1254 | try { | ||
| 1255 | iter = theRegistry.getServiceProviders(ImageTranscoderSpi.class, | ||
| 1256 | filter, true); | ||
| 1257 | } catch (IllegalArgumentException e) { | ||
| 1258 | return Collections.emptyIterator(); | ||
| 1259 | } | ||
| 1260 | return new ImageTranscoderIterator(iter); | ||
| 1261 | } | ||
| 1262 | |||
| 1263 | // All-in-one methods | ||
| 1264 | |||
| 1265 | /** | ||
| 1266 | * Returns a <code>BufferedImage</code> as the result of decoding | ||
| 1267 | * a supplied <code>File</code> with an <code>ImageReader</code> | ||
| 1268 | * chosen automatically from among those currently registered. | ||
| 1269 | * The <code>File</code> is wrapped in an | ||
| 1270 | * <code>ImageInputStream</code>. If no registered | ||
| 1271 | * <code>ImageReader</code> claims to be able to read the | ||
| 1272 | * resulting stream, <code>null</code> is returned. | ||
| 1273 | * | ||
| 1274 | * <p> The current cache settings from <code>getUseCache</code>and | ||
| 1275 | * <code>getCacheDirectory</code> will be used to control caching in the | ||
| 1276 | * <code>ImageInputStream</code> that is created. | ||
| 1277 | * | ||
| 1278 | * <p> Note that there is no <code>read</code> method that takes a | ||
| 1279 | * filename as a <code>String</code>; use this method instead after | ||
| 1280 | * creating a <code>File</code> from the filename. | ||
| 1281 | * | ||
| 1282 | * <p> This method does not attempt to locate | ||
| 1283 | * <code>ImageReader</code>s that can read directly from a | ||
| 1284 | * <code>File</code>; that may be accomplished using | ||
| 1285 | * <code>IIORegistry</code> and <code>ImageReaderSpi</code>. | ||
| 1286 | * | ||
| 1287 | * @param input a <code>File</code> to read from. | ||
| 1288 | * | ||
| 1289 | * @return a <code>BufferedImage</code> containing the decoded | ||
| 1290 | * contents of the input, or <code>null</code>. | ||
| 1291 | * | ||
| 1292 | * @exception IllegalArgumentException if <code>input</code> is | ||
| 1293 | * <code>null</code>. | ||
| 1294 | * @exception IOException if an error occurs during reading. | ||
| 1295 | */ | ||
| 1296 | public static BufferedImage read(File input) throws IOException { | ||
| 1297 | if (input == null) { | ||
| 1298 | throw new IllegalArgumentException("input == null!"); | ||
| 1299 | } | ||
| 1300 | if (!input.canRead()) { | ||
| 1301 | throw new IIOException("Can't read input file!"); | ||
| 1302 | } | ||
| 1303 | |||
| 1304 | ImageInputStream stream = createImageInputStream(input); | ||
| 1305 | if (stream == null) { | ||
| 1306 | throw new IIOException("Can't create an ImageInputStream!"); | ||
| 1307 | } | ||
| 1308 | BufferedImage bi = read(stream); | ||
| 1309 | if (bi == null) { | ||
| 1310 | stream.close(); | ||
| 1311 | } | ||
| 1312 | return bi; | ||
| 1313 | } | ||
| 1314 | |||
| 1315 | /** | ||
| 1316 | * Returns a <code>BufferedImage</code> as the result of decoding | ||
| 1317 | * a supplied <code>InputStream</code> with an <code>ImageReader</code> | ||
| 1318 | * chosen automatically from among those currently registered. | ||
| 1319 | * The <code>InputStream</code> is wrapped in an | ||
| 1320 | * <code>ImageInputStream</code>. If no registered | ||
| 1321 | * <code>ImageReader</code> claims to be able to read the | ||
| 1322 | * resulting stream, <code>null</code> is returned. | ||
| 1323 | * | ||
| 1324 | * <p> The current cache settings from <code>getUseCache</code>and | ||
| 1325 | * <code>getCacheDirectory</code> will be used to control caching in the | ||
| 1326 | * <code>ImageInputStream</code> that is created. | ||
| 1327 | * | ||
| 1328 | * <p> This method does not attempt to locate | ||
| 1329 | * <code>ImageReader</code>s that can read directly from an | ||
| 1330 | * <code>InputStream</code>; that may be accomplished using | ||
| 1331 | * <code>IIORegistry</code> and <code>ImageReaderSpi</code>. | ||
| 1332 | * | ||
| 1333 | * <p> This method <em>does not</em> close the provided | ||
| 1334 | * <code>InputStream</code> after the read operation has completed; | ||
| 1335 | * it is the responsibility of the caller to close the stream, if desired. | ||
| 1336 | * | ||
| 1337 | * @param input an <code>InputStream</code> to read from. | ||
| 1338 | * | ||
| 1339 | * @return a <code>BufferedImage</code> containing the decoded | ||
| 1340 | * contents of the input, or <code>null</code>. | ||
| 1341 | * | ||
| 1342 | * @exception IllegalArgumentException if <code>input</code> is | ||
| 1343 | * <code>null</code>. | ||
| 1344 | * @exception IOException if an error occurs during reading. | ||
| 1345 | */ | ||
| 1346 | public static BufferedImage read(InputStream input) throws IOException { | ||
| 1347 | if (input == null) { | ||
| 1348 | throw new IllegalArgumentException("input == null!"); | ||
| 1349 | } | ||
| 1350 | |||
| 1351 | ImageInputStream stream = createImageInputStream(input); | ||
| 1352 | BufferedImage bi = read(stream); | ||
| 1353 | if (bi == null) { | ||
| 1354 | stream.close(); | ||
| 1355 | } | ||
| 1356 | return bi; | ||
| 1357 | } | ||
| 1358 | |||
| 1359 | /** | ||
| 1360 | * Returns a <code>BufferedImage</code> as the result of decoding | ||
| 1361 | * a supplied <code>URL</code> with an <code>ImageReader</code> | ||
| 1362 | * chosen automatically from among those currently registered. An | ||
| 1363 | * <code>InputStream</code> is obtained from the <code>URL</code>, | ||
| 1364 | * which is wrapped in an <code>ImageInputStream</code>. If no | ||
| 1365 | * registered <code>ImageReader</code> claims to be able to read | ||
| 1366 | * the resulting stream, <code>null</code> is returned. | ||
| 1367 | * | ||
| 1368 | * <p> The current cache settings from <code>getUseCache</code>and | ||
| 1369 | * <code>getCacheDirectory</code> will be used to control caching in the | ||
| 1370 | * <code>ImageInputStream</code> that is created. | ||
| 1371 | * | ||
| 1372 | * <p> This method does not attempt to locate | ||
| 1373 | * <code>ImageReader</code>s that can read directly from a | ||
| 1374 | * <code>URL</code>; that may be accomplished using | ||
| 1375 | * <code>IIORegistry</code> and <code>ImageReaderSpi</code>. | ||
| 1376 | * | ||
| 1377 | * @param input a <code>URL</code> to read from. | ||
| 1378 | * | ||
| 1379 | * @return a <code>BufferedImage</code> containing the decoded | ||
| 1380 | * contents of the input, or <code>null</code>. | ||
| 1381 | * | ||
| 1382 | * @exception IllegalArgumentException if <code>input</code> is | ||
| 1383 | * <code>null</code>. | ||
| 1384 | * @exception IOException if an error occurs during reading. | ||
| 1385 | */ | ||
| 1386 | public static BufferedImage read(URL input) throws IOException { | ||
| 1387 | if (input == null) { | ||
| 1388 | throw new IllegalArgumentException("input == null!"); | ||
| 1389 | } | ||
| 1390 | |||
| 1391 | InputStream istream = null; | ||
| 1392 | try { | ||
| 1393 | istream = input.openStream(); | ||
| 1394 | } catch (IOException e) { | ||
| 1395 | throw new IIOException("Can't get input stream from URL!", e); | ||
| 1396 | } | ||
| 1397 | ImageInputStream stream = createImageInputStream(istream); | ||
| 1398 | BufferedImage bi; | ||
| 1399 | try { | ||
| 1400 | bi = read(stream); | ||
| 1401 | if (bi == null) { | ||
| 1402 | stream.close(); | ||
| 1403 | } | ||
| 1404 | } finally { | ||
| 1405 | istream.close(); | ||
| 1406 | } | ||
| 1407 | return bi; | ||
| 1408 | } | ||
| 1409 | |||
| 1410 | /** | ||
| 1411 | * Returns a <code>BufferedImage</code> as the result of decoding | ||
| 1412 | * a supplied <code>ImageInputStream</code> with an | ||
| 1413 | * <code>ImageReader</code> chosen automatically from among those | ||
| 1414 | * currently registered. If no registered | ||
| 1415 | * <code>ImageReader</code> claims to be able to read the stream, | ||
| 1416 | * <code>null</code> is returned. | ||
| 1417 | * | ||
| 1418 | * <p> Unlike most other methods in this class, this method <em>does</em> | ||
| 1419 | * close the provided <code>ImageInputStream</code> after the read | ||
| 1420 | * operation has completed, unless <code>null</code> is returned, | ||
| 1421 | * in which case this method <em>does not</em> close the stream. | ||
| 1422 | * | ||
| 1423 | * @param stream an <code>ImageInputStream</code> to read from. | ||
| 1424 | * | ||
| 1425 | * @return a <code>BufferedImage</code> containing the decoded | ||
| 1426 | * contents of the input, or <code>null</code>. | ||
| 1427 | * | ||
| 1428 | * @exception IllegalArgumentException if <code>stream</code> is | ||
| 1429 | * <code>null</code>. | ||
| 1430 | * @exception IOException if an error occurs during reading. | ||
| 1431 | */ | ||
| 1432 | public static BufferedImage read(ImageInputStream stream) | ||
| 1433 | throws IOException { | ||
| 1434 | if (stream == null) { | ||
| 1435 | throw new IllegalArgumentException("stream == null!"); | ||
| 1436 | } | ||
| 1437 | |||
| 1438 | Iterator iter = getImageReaders(stream); | ||
| 1439 | if (!iter.hasNext()) { | ||
| 1440 | return null; | ||
| 1441 | } | ||
| 1442 | |||
| 1443 | ImageReader reader = (ImageReader)iter.next(); | ||
| 1444 | ImageReadParam param = reader.getDefaultReadParam(); | ||
| 1445 | reader.setInput(stream, true, true); | ||
| 1446 | BufferedImage bi; | ||
| 1447 | try { | ||
| 1448 | bi = reader.read(0, param); | ||
| 1449 | } finally { | ||
| 1450 | reader.dispose(); | ||
| 1451 | stream.close(); | ||
| 1452 | } | ||
| 1453 | return bi; | ||
| 1454 | } | ||
| 1455 | |||
| 1456 | /** | ||
| 1457 | * Writes an image using the an arbitrary <code>ImageWriter</code> | ||
| 1458 | * that supports the given format to an | ||
| 1459 | * <code>ImageOutputStream</code>. The image is written to the | ||
| 1460 | * <code>ImageOutputStream</code> starting at the current stream | ||
| 1461 | * pointer, overwriting existing stream data from that point | ||
| 1462 | * forward, if present. | ||
| 1463 | * | ||
| 1464 | * <p> This method <em>does not</em> close the provided | ||
| 1465 | * <code>ImageOutputStream</code> after the write operation has completed; | ||
| 1466 | * it is the responsibility of the caller to close the stream, if desired. | ||
| 1467 | * | ||
| 1468 | * @param im a <code>RenderedImage</code> to be written. | ||
| 1469 | * @param formatName a <code>String</code> containg the informal | ||
| 1470 | * name of the format. | ||
| 1471 | * @param output an <code>ImageOutputStream</code> to be written to. | ||
| 1472 | * | ||
| 1473 | * @return <code>false</code> if no appropriate writer is found. | ||
| 1474 | * | ||
| 1475 | * @exception IllegalArgumentException if any parameter is | ||
| 1476 | * <code>null</code>. | ||
| 1477 | * @exception IOException if an error occurs during writing. | ||
| 1478 | */ | ||
| 1479 | public static boolean write(RenderedImage im, | ||
| 1480 | String formatName, | ||
| 1481 | ImageOutputStream output) throws IOException { | ||
| 1482 | if (im == null) { | ||
| 1483 | throw new IllegalArgumentException("im == null!"); | ||
| 1484 | } | ||
| 1485 | if (formatName == null) { | ||
| 1486 | throw new IllegalArgumentException("formatName == null!"); | ||
| 1487 | } | ||
| 1488 | if (output == null) { | ||
| 1489 | throw new IllegalArgumentException("output == null!"); | ||
| 1490 | } | ||
| 1491 | |||
| 1492 | return doWrite(im, getWriter(im, formatName), output); | ||
| 1493 | } | ||
| 1494 | |||
| 1495 | /** | ||
| 1496 | * Writes an image using an arbitrary <code>ImageWriter</code> | ||
| 1497 | * that supports the given format to a <code>File</code>. If | ||
| 1498 | * there is already a <code>File</code> present, its contents are | ||
| 1499 | * discarded. | ||
| 1500 | * | ||
| 1501 | * @param im a <code>RenderedImage</code> to be written. | ||
| 1502 | * @param formatName a <code>String</code> containg the informal | ||
| 1503 | * name of the format. | ||
| 1504 | * @param output a <code>File</code> to be written to. | ||
| 1505 | * | ||
| 1506 | * @return <code>false</code> if no appropriate writer is found. | ||
| 1507 | * | ||
| 1508 | * @exception IllegalArgumentException if any parameter is | ||
| 1509 | * <code>null</code>. | ||
| 1510 | * @exception IOException if an error occurs during writing. | ||
| 1511 | */ | ||
| 1512 | public static boolean write(RenderedImage im, | ||
| 1513 | String formatName, | ||
| 1514 | File output) throws IOException { | ||
| 1515 | if (output == null) { | ||
| 1516 | throw new IllegalArgumentException("output == null!"); | ||
| 1517 | } | ||
| 1518 | ImageOutputStream stream = null; | ||
| 1519 | |||
| 1520 | ImageWriter writer = getWriter(im, formatName); | ||
| 1521 | if (writer == null) { | ||
| 1522 | /* Do not make changes in the file system if we have | ||
| 1523 | * no appropriate writer. | ||
| 1524 | */ | ||
| 1525 | return false; | ||
| 1526 | } | ||
| 1527 | |||
| 1528 | try { | ||
| 1529 | output.delete(); | ||
| 1530 | stream = createImageOutputStream(output); | ||
| 1531 | } catch (IOException e) { | ||
| 1532 | throw new IIOException("Can't create output stream!", e); | ||
| 1533 | } | ||
| 1534 | |||
| 1535 | try { | ||
| 1536 | return doWrite(im, writer, stream); | ||
| 1537 | } finally { | ||
| 1538 | stream.close(); | ||
| 1539 | } | ||
| 1540 | } | ||
| 1541 | |||
| 1542 | /** | ||
| 1543 | * Writes an image using an arbitrary <code>ImageWriter</code> | ||
| 1544 | * that supports the given format to an <code>OutputStream</code>. | ||
| 1545 | * | ||
| 1546 | * <p> This method <em>does not</em> close the provided | ||
| 1547 | * <code>OutputStream</code> after the write operation has completed; | ||
| 1548 | * it is the responsibility of the caller to close the stream, if desired. | ||
| 1549 | * | ||
| 1550 | * <p> The current cache settings from <code>getUseCache</code>and | ||
| 1551 | * <code>getCacheDirectory</code> will be used to control caching. | ||
| 1552 | * | ||
| 1553 | * @param im a <code>RenderedImage</code> to be written. | ||
| 1554 | * @param formatName a <code>String</code> containg the informal | ||
| 1555 | * name of the format. | ||
| 1556 | * @param output an <code>OutputStream</code> to be written to. | ||
| 1557 | * | ||
| 1558 | * @return <code>false</code> if no appropriate writer is found. | ||
| 1559 | * | ||
| 1560 | * @exception IllegalArgumentException if any parameter is | ||
| 1561 | * <code>null</code>. | ||
| 1562 | * @exception IOException if an error occurs during writing. | ||
| 1563 | */ | ||
| 1564 | public static boolean write(RenderedImage im, | ||
| 1565 | String formatName, | ||
| 1566 | OutputStream output) throws IOException { | ||
| 1567 | if (output == null) { | ||
| 1568 | throw new IllegalArgumentException("output == null!"); | ||
| 1569 | } | ||
| 1570 | ImageOutputStream stream = null; | ||
| 1571 | try { | ||
| 1572 | stream = createImageOutputStream(output); | ||
| 1573 | } catch (IOException e) { | ||
| 1574 | throw new IIOException("Can't create output stream!", e); | ||
| 1575 | } | ||
| 1576 | |||
| 1577 | try { | ||
| 1578 | return doWrite(im, getWriter(im, formatName), stream); | ||
| 1579 | } finally { | ||
| 1580 | stream.close(); | ||
| 1581 | } | ||
| 1582 | } | ||
| 1583 | |||
| 1584 | /** | ||
| 1585 | * Returns <code>ImageWriter</code> instance according to given | ||
| 1586 | * rendered image and image format or <code>null</code> if there | ||
| 1587 | * is no appropriate writer. | ||
| 1588 | */ | ||
| 1589 | private static ImageWriter getWriter(RenderedImage im, | ||
| 1590 | String formatName) { | ||
| 1591 | ImageTypeSpecifier type = | ||
| 1592 | ImageTypeSpecifier.createFromRenderedImage(im); | ||
| 1593 | Iterator<ImageWriter> iter = getImageWriters(type, formatName); | ||
| 1594 | |||
| 1595 | if (iter.hasNext()) { | ||
| 1596 | return iter.next(); | ||
| 1597 | } else { | ||
| 1598 | return null; | ||
| 1599 | } | ||
| 1600 | } | ||
| 1601 | |||
| 1602 | /** | ||
| 1603 | * Writes image to output stream using given image writer. | ||
| 1604 | */ | ||
| 1605 | private static boolean doWrite(RenderedImage im, ImageWriter writer, | ||
| 1606 | ImageOutputStream output) throws IOException { | ||
| 1607 | if (writer == null) { | ||
| 1608 | return false; | ||
| 1609 | } | ||
| 1610 | writer.setOutput(output); | ||
| 1611 | try { | ||
| 1612 | writer.write(im); | ||
| 1613 | } finally { | ||
| 1614 | writer.dispose(); | ||
| 1615 | output.flush(); | ||
| 1616 | } | ||
| 1617 | return true; | ||
| 1618 | } | ||
| 1619 | } | ||