1 /* 2 * Copyright (c) 2005, 2016, 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 javax.imageio.plugins.tiff; 26 27 import java.util.StringTokenizer; 28 import org.w3c.dom.NamedNodeMap; 29 import org.w3c.dom.Node; 30 import com.sun.imageio.plugins.tiff.TIFFFieldNode; 31 import com.sun.imageio.plugins.tiff.TIFFIFD; 32 33 /** 34 * A class representing a field in a TIFF 6.0 Image File Directory. 35 * 36 * <p> A field in a TIFF Image File Directory (IFD) is defined as a 37 * tag number accompanied by a sequence of values of identical data type. 38 * TIFF 6.0 defines 12 data types; a 13th type {@code IFD} is 39 * defined in TIFF Tech Note 1 of TIFF Specification Supplement 1. These 40 * TIFF data types are referred to by Java constants and mapped internally 41 * onto Java language data types and type names as follows: 42 * 43 * <br> 44 * <br> 45 * <table border="1"> 46 * <caption>TIFF Data Type to Java Data Type Mapping</caption> 47 * 48 * <tr> 49 * <th> 50 * <b>TIFF Data Type</b> 51 * </th> 52 * <th> 53 * <b>Java Constant</b> 54 * </th> 55 * <th> 56 * <b>Java Data Type</b> 57 * </th> 58 * <th> 59 * <b>Java Type Name</b> 60 * </th> 61 * </tr> 62 * 63 * <tr> 64 * <td> 65 * <tt>BYTE</tt> 66 * </td> 67 * <td> 68 * {@link TIFFTag#TIFF_BYTE} 69 * </td> 70 * <td> 71 * {@code byte} 72 * </td> 73 * <td> 74 * {@code "Byte"} 75 * </td> 76 * </tr> 77 * 78 * <tr> 79 * <td> 80 * <tt>ASCII</tt> 81 * </td> 82 * <td> 83 * {@link TIFFTag#TIFF_ASCII} 84 * </td> 85 * <td> 86 * {@code String} 87 * </td> 88 * <td> 89 * {@code "Ascii"} 90 * </td> 91 * </tr> 92 * 93 * <tr> 94 * <td> 95 * <tt>SHORT</tt> 96 * </td> 97 * <td> 98 * {@link TIFFTag#TIFF_SHORT} 99 * </td> 100 * <td> 101 * {@code char} 102 * </td> 103 * <td> 104 * {@code "Short"} 105 * </td> 106 * </tr> 107 * 108 * <tr> 109 * <td> 110 * <tt>LONG</tt> 111 * </td> 112 * <td> 113 * {@link TIFFTag#TIFF_LONG} 114 * </td> 115 * <td> 116 * {@code long} 117 * </td> 118 * <td> 119 * {@code "Long"} 120 * </td> 121 * </tr> 122 * 123 * <tr> 124 * <td> 125 * <tt>RATIONAL</tt> 126 * </td> 127 * <td> 128 * {@link TIFFTag#TIFF_RATIONAL} 129 * </td> 130 * <td> 131 * {@code long[2]} {numerator, denominator} 132 * </td> 133 * <td> 134 * {@code "Rational"} 135 * </td> 136 * </tr> 137 * 138 * <tr> 139 * <td> 140 * <tt>SBYTE</tt> 141 * </td> 142 * <td> 143 * {@link TIFFTag#TIFF_SBYTE} 144 * </td> 145 * <td> 146 * {@code byte} 147 * </td> 148 * <td> 149 * {@code "SByte"} 150 * </td> 151 * </tr> 152 * 153 * <tr> 154 * <td> 155 * <tt>UNDEFINED</tt> 156 * </td> 157 * <td> 158 * {@link TIFFTag#TIFF_UNDEFINED} 159 * </td> 160 * <td> 161 * {@code byte} 162 * </td> 163 * <td> 164 * {@code "Undefined"} 165 * </td> 166 * </tr> 167 * 168 * <tr> 169 * <td> 170 * <tt>SSHORT</tt> 171 * </td> 172 * <td> 173 * {@link TIFFTag#TIFF_SSHORT} 174 * </td> 175 * <td> 176 * {@code short} 177 * </td> 178 * <td> 179 * {@code "SShort"} 180 * </td> 181 * </tr> 182 * 183 * <tr> 184 * <td> 185 * <tt>SLONG</tt> 186 * </td> 187 * <td> 188 * {@link TIFFTag#TIFF_SLONG} 189 * </td> 190 * <td> 191 * {@code int} 192 * </td> 193 * <td> 194 * {@code "SLong"} 195 * </td> 196 * </tr> 197 * 198 * <tr> 199 * <td> 200 * <tt>SRATIONAL</tt> 201 * </td> 202 * <td> 203 * {@link TIFFTag#TIFF_SRATIONAL} 204 * </td> 205 * <td> 206 * {@code int[2]} {numerator, denominator} 207 * </td> 208 * <td> 209 * {@code "SRational"} 210 * </td> 211 * </tr> 212 * 213 * <tr> 214 * <td> 215 * <tt>FLOAT</tt> 216 * </td> 217 * <td> 218 * {@link TIFFTag#TIFF_FLOAT} 219 * </td> 220 * <td> 221 * {@code float} 222 * </td> 223 * <td> 224 * {@code "Float"} 225 * </td> 226 * </tr> 227 * 228 * <tr> 229 * <td> 230 * <tt>DOUBLE</tt> 231 * </td> 232 * <td> 233 * {@link TIFFTag#TIFF_DOUBLE} 234 * </td> 235 * <td> 236 * {@code double} 237 * </td> 238 * <td> 239 * {@code "Double"} 240 * </td> 241 * </tr> 242 * 243 * <tr> 244 * <td> 245 * <tt>IFD</tt> 246 * </td> 247 * <td> 248 * {@link TIFFTag#TIFF_IFD_POINTER} 249 * </td> 250 * <td> 251 * {@code long} 252 * </td> 253 * <td> 254 * {@code "IFDPointer"} 255 * </td> 256 * </tr> 257 * 258 * </table> 259 * 260 * @since 9 261 * @see TIFFDirectory 262 * @see TIFFTag 263 */ 264 public class TIFFField implements Cloneable { 265 266 private static final String[] typeNames = { 267 null, 268 "Byte", "Ascii", "Short", "Long", "Rational", 269 "SByte", "Undefined", "SShort", "SLong", "SRational", 270 "Float", "Double", "IFDPointer" 271 }; 272 273 private static final boolean[] isIntegral = { 274 false, 275 true, false, true, true, false, 276 true, true, true, true, false, 277 false, false, false 278 }; 279 280 /** The tag. */ 281 private TIFFTag tag; 282 283 /** The tag number. */ 284 private int tagNumber; 285 286 /** The tag type. */ 287 private int type; 288 289 /** The number of data items present in the field. */ 290 private int count; 291 292 /** The field data. */ 293 private Object data; 294 295 /** The IFD contents if available. This will usually be a TIFFIFD. */ 296 private TIFFDirectory dir; 297 298 /** The default constructor. */ 299 private TIFFField() {} 300 301 private static String getAttribute(Node node, String attrName) { 302 NamedNodeMap attrs = node.getAttributes(); 303 return attrs.getNamedItem(attrName).getNodeValue(); 304 } 305 306 private static void initData(Node node, 307 int[] otype, int[] ocount, Object[] odata) { 308 int type; 309 int count; 310 Object data = null; 311 312 String typeName = node.getNodeName(); 313 typeName = typeName.substring(4); 314 typeName = typeName.substring(0, typeName.length() - 1); 315 type = TIFFField.getTypeByName(typeName); 316 if (type == -1) { 317 throw new IllegalArgumentException("typeName = " + typeName); 318 } 319 320 Node child = node.getFirstChild(); 321 322 count = 0; 323 while (child != null) { 324 String childTypeName = child.getNodeName().substring(4); 325 if (!typeName.equals(childTypeName)) { 326 // warning 327 } 328 329 ++count; 330 child = child.getNextSibling(); 331 } 332 333 if (count > 0) { 334 data = createArrayForType(type, count); 335 child = node.getFirstChild(); 336 int idx = 0; 337 while (child != null) { 338 String value = getAttribute(child, "value"); 339 340 String numerator, denominator; 341 int slashPos; 342 343 switch (type) { 344 case TIFFTag.TIFF_ASCII: 345 ((String[])data)[idx] = value; 346 break; 347 case TIFFTag.TIFF_BYTE: 348 case TIFFTag.TIFF_SBYTE: 349 ((byte[])data)[idx] = 350 (byte)Integer.parseInt(value); 351 break; 352 case TIFFTag.TIFF_SHORT: 353 ((char[])data)[idx] = 354 (char)Integer.parseInt(value); 355 break; 356 case TIFFTag.TIFF_SSHORT: 357 ((short[])data)[idx] = 358 (short)Integer.parseInt(value); 359 break; 360 case TIFFTag.TIFF_SLONG: 361 ((int[])data)[idx] = 362 Integer.parseInt(value); 363 break; 364 case TIFFTag.TIFF_LONG: 365 case TIFFTag.TIFF_IFD_POINTER: 366 ((long[])data)[idx] = 367 Long.parseLong(value); 368 break; 369 case TIFFTag.TIFF_FLOAT: 370 ((float[])data)[idx] = 371 Float.parseFloat(value); 372 break; 373 case TIFFTag.TIFF_DOUBLE: 374 ((double[])data)[idx] = 375 Double.parseDouble(value); 376 break; 377 case TIFFTag.TIFF_SRATIONAL: 378 slashPos = value.indexOf("/"); 379 numerator = value.substring(0, slashPos); 380 denominator = value.substring(slashPos + 1); 381 382 ((int[][])data)[idx] = new int[2]; 383 ((int[][])data)[idx][0] = 384 Integer.parseInt(numerator); 385 ((int[][])data)[idx][1] = 386 Integer.parseInt(denominator); 387 break; 388 case TIFFTag.TIFF_RATIONAL: 389 slashPos = value.indexOf("/"); 390 numerator = value.substring(0, slashPos); 391 denominator = value.substring(slashPos + 1); 392 393 ((long[][])data)[idx] = new long[2]; 394 ((long[][])data)[idx][0] = 395 Long.parseLong(numerator); 396 ((long[][])data)[idx][1] = 397 Long.parseLong(denominator); 398 break; 399 default: 400 // error 401 } 402 403 idx++; 404 child = child.getNextSibling(); 405 } 406 } 407 408 otype[0] = type; 409 ocount[0] = count; 410 odata[0] = data; 411 } 412 413 /** 414 * Creates a {@code TIFFField} from a TIFF native image 415 * metadata node. If the value of the {@code "number"} attribute 416 * of the node is not found in {@code tagSet} then a new 417 * {@code TIFFTag} with name {@code TIFFTag.UNKNOWN_TAG_NAME} 418 * will be created and assigned to the field. 419 * 420 * @param tagSet The {@code TIFFTagSet} to which the 421 * {@code TIFFTag} of the field belongs. 422 * @param node A native TIFF image metadata {@code TIFFField} node. 423 * @throws IllegalArgumentException If the {@code Node} parameter content 424 * does not adhere to the {@code TIFFField} element structure defined by 425 * the <a href="../../metadata/doc-files/tiff_metadata.html#ImageMetadata"> 426 * TIFF native image metadata format specification</a>, or if the 427 * combination of node attributes and data is not legal per the 428 * {@link #TIFFField(TIFFTag,int,int,Object)} constructor specification. 429 * Note that a cause might be set on such an exception. 430 * @return A new {@code TIFFField}. 431 */ 432 public static TIFFField createFromMetadataNode(TIFFTagSet tagSet, 433 Node node) { 434 if (node == null) { 435 // This method is specified to throw only IllegalArgumentExceptions 436 // so we create an IAE with a NullPointerException as its cause. 437 throw new IllegalArgumentException(new NullPointerException 438 ("node == null!")); 439 } 440 String name = node.getNodeName(); 441 if (!name.equals("TIFFField")) { 442 throw new IllegalArgumentException("!name.equals(\"TIFFField\")"); 443 } 444 445 int tagNumber = Integer.parseInt(getAttribute(node, "number")); 446 TIFFTag tag = null; 447 if (tagSet != null) { 448 tag = tagSet.getTag(tagNumber); 449 } 450 451 int type = TIFFTag.TIFF_UNDEFINED; 452 int count = 0; 453 Object data = null; 454 455 Node child = node.getFirstChild(); 456 if (child != null) { 457 String typeName = child.getNodeName(); 458 if (typeName.equals("TIFFUndefined")) { 459 String values = getAttribute(child, "value"); 460 StringTokenizer st = new StringTokenizer(values, ","); 461 count = st.countTokens(); 462 463 byte[] bdata = new byte[count]; 464 for (int i = 0; i < count; i++) { 465 bdata[i] = (byte)Integer.parseInt(st.nextToken()); 466 } 467 468 type = TIFFTag.TIFF_UNDEFINED; 469 data = bdata; 470 } else { 471 int[] otype = new int[1]; 472 int[] ocount = new int[1]; 473 Object[] odata = new Object[1]; 474 475 initData(node.getFirstChild(), otype, ocount, odata); 476 type = otype[0]; 477 count = ocount[0]; 478 data = odata[0]; 479 } 480 } else if (tag != null) { 481 int t = TIFFTag.MAX_DATATYPE; 482 while(t >= TIFFTag.MIN_DATATYPE && !tag.isDataTypeOK(t)) { 483 t--; 484 } 485 type = t; 486 } 487 488 if (tag == null) { 489 tag = new TIFFTag(TIFFTag.UNKNOWN_TAG_NAME, tagNumber, 1 << type); 490 } 491 492 TIFFField field; 493 try { 494 field = new TIFFField(tag, type, count, data); 495 } catch (NullPointerException npe) { 496 // This method is specified to throw only IllegalArgumentExceptions 497 // so we catch the NullPointerException and set it as the cause of 498 // the IAE which is thrown. 499 throw new IllegalArgumentException(npe); 500 } 501 502 return field; 503 } 504 505 /** 506 * Constructs a {@code TIFFField} with arbitrary data. The 507 * {@code type} parameter must be a value for which 508 * {@link TIFFTag#isDataTypeOK tag.isDataTypeOK()} 509 * returns {@code true}. The {@code data} parameter must 510 * be an array of a Java type appropriate for the type of the TIFF 511 * field. 512 * 513 * <p>Note that the value (data) of the {@code TIFFField} 514 * will always be the actual field value regardless of the number of 515 * bytes required for that value. This is the case despite the fact 516 * that the TIFF <i>IFD Entry</i> corresponding to the field may 517 * actually contain the offset to the value of the field rather than 518 * the value itself (the latter occurring if and only if the 519 * value fits into 4 bytes). In other words, the value of the 520 * field will already have been read from the TIFF stream. (An exception 521 * to this case may occur when the field represents the contents of a 522 * non-baseline IFD. In that case the data will be a {@code long[]} 523 * containing the offset to the IFD and the {@code TIFFDirectory} 524 * returned by {@link #getDirectory()} will be its contents.) 525 * 526 * @param tag The tag to associated with this field. 527 * @param type One of the {@code TIFFTag.TIFF_*} constants 528 * indicating the data type of the field as written to the TIFF stream. 529 * @param count The number of data values. 530 * @param data The actual data content of the field. 531 * 532 * @throws NullPointerException if {@code tag == null}. 533 * @throws IllegalArgumentException if {@code type} is not 534 * one of the {@code TIFFTag.TIFF_*} data type constants. 535 * @throws IllegalArgumentException if {@code type} is an unacceptable 536 * data type for the supplied {@code TIFFTag}. 537 * @throws IllegalArgumentException if {@code count < 0}. 538 * @throws IllegalArgumentException if {@code count < 1} 539 * and {@code type} is {@code TIFF_RATIONAL} or 540 * {@code TIFF_SRATIONAL}. 541 * @throws IllegalArgumentException if {@code count != 1} 542 * and {@code type} is {@code TIFF_IFD_POINTER}. 543 * @throws NullPointerException if {@code data == null}. 544 * @throws IllegalArgumentException if {@code data} is an instance of 545 * a class incompatible with the specified type. 546 * @throws IllegalArgumentException if the size of the data array is wrong. 547 */ 548 public TIFFField(TIFFTag tag, int type, int count, Object data) { 549 if(tag == null) { 550 throw new NullPointerException("tag == null!"); 551 } else if(type < TIFFTag.MIN_DATATYPE || type > TIFFTag.MAX_DATATYPE) { 552 throw new IllegalArgumentException("Unknown data type "+type); 553 } else if(!tag.isDataTypeOK(type)) { 554 throw new IllegalArgumentException("Illegal data type " + type 555 + " for " + tag.getName() + " tag"); 556 } else if(count < 0) { 557 throw new IllegalArgumentException("count < 0!"); 558 } else if((type == TIFFTag.TIFF_RATIONAL 559 || type == TIFFTag.TIFF_SRATIONAL) 560 && count < 1) { 561 throw new IllegalArgumentException 562 ("Type is TIFF_RATIONAL or TIFF_SRATIONAL and count < 1"); 563 } else if (type == TIFFTag.TIFF_IFD_POINTER && count != 1) { 564 throw new IllegalArgumentException 565 ("Type is TIFF_IFD_POINTER count != 1"); 566 } else if(data == null) { 567 throw new NullPointerException("data == null!"); 568 } 569 570 boolean isDataArrayCorrect = false; 571 572 switch (type) { 573 case TIFFTag.TIFF_BYTE: 574 case TIFFTag.TIFF_SBYTE: 575 case TIFFTag.TIFF_UNDEFINED: 576 isDataArrayCorrect = data instanceof byte[] 577 && ((byte[])data).length == count; 578 break; 579 case TIFFTag.TIFF_ASCII: 580 isDataArrayCorrect = data instanceof String[] 581 && ((String[])data).length == count; 582 break; 583 case TIFFTag.TIFF_SHORT: 584 isDataArrayCorrect = data instanceof char[] 585 && ((char[])data).length == count; 586 break; 587 case TIFFTag.TIFF_LONG: 588 isDataArrayCorrect = data instanceof long[] 589 && ((long[])data).length == count; 590 break; 591 case TIFFTag.TIFF_IFD_POINTER: 592 isDataArrayCorrect = data instanceof long[] 593 && ((long[])data).length == 1; 594 break; 595 case TIFFTag.TIFF_RATIONAL: 596 isDataArrayCorrect = data instanceof long[][] 597 && ((long[][])data).length == count 598 && ((long[][])data)[0].length == 2; 599 break; 600 case TIFFTag.TIFF_SSHORT: 601 isDataArrayCorrect = data instanceof short[] 602 && ((short[])data).length == count; 603 break; 604 case TIFFTag.TIFF_SLONG: 605 isDataArrayCorrect = data instanceof int[] 606 && ((int[])data).length == count; 607 break; 608 case TIFFTag.TIFF_SRATIONAL: 609 isDataArrayCorrect = data instanceof int[][] 610 && ((int[][])data).length == count 611 && ((int[][])data)[0].length == 2; 612 break; 613 case TIFFTag.TIFF_FLOAT: 614 isDataArrayCorrect = data instanceof float[] 615 && ((float[])data).length == count; 616 break; 617 case TIFFTag.TIFF_DOUBLE: 618 isDataArrayCorrect = data instanceof double[] 619 && ((double[])data).length == count; 620 break; 621 default: 622 throw new IllegalArgumentException("Unknown data type "+type); 623 } 624 625 if (!isDataArrayCorrect) { 626 throw new IllegalArgumentException 627 ("Illegal class or length for data array"); 628 } 629 630 this.tag = tag; 631 this.tagNumber = tag.getNumber(); 632 this.type = type; 633 this.count = count; 634 this.data = data; 635 } 636 637 /** 638 * Constructs a data array using {@link #createArrayForType 639 * createArrayForType()} and invokes 640 * {@link #TIFFField(TIFFTag,int,int,Object)} with the supplied 641 * parameters and the created array. 642 * 643 * @param tag The tag to associated with this field. 644 * @param type One of the {@code TIFFTag.TIFF_*} constants 645 * indicating the data type of the field as written to the TIFF stream. 646 * @param count The number of data values. 647 * @throws NullPointerException if {@code tag == null}. 648 * @throws IllegalArgumentException if {@code type} is not 649 * one of the {@code TIFFTag.TIFF_*} data type constants. 650 * @throws IllegalArgumentException if {@code type} is an unacceptable 651 * data type for the supplied {@code TIFFTag}. 652 * @throws IllegalArgumentException if {@code count < 0}. 653 * @see #TIFFField(TIFFTag,int,int,Object) 654 */ 655 public TIFFField(TIFFTag tag, int type, int count) { 656 this(tag, type, count, createArrayForType(type, count)); 657 } 658 659 /** 660 * Constructs a {@code TIFFField} with a single non-negative integral 661 * value. 662 * The field will have type 663 * {@link TIFFTag#TIFF_SHORT TIFF_SHORT} if 664 * {@code val < 65536} and type 665 * {@link TIFFTag#TIFF_LONG TIFF_LONG} otherwise. The count 666 * of the field will be unity. 667 * 668 * @param tag The tag to associate with this field. 669 * @param value The value to associate with this field. 670 * @throws NullPointerException if {@code tag == null}. 671 * @throws IllegalArgumentException if the derived type is unacceptable 672 * for the supplied {@code TIFFTag}. 673 * @throws IllegalArgumentException if {@code value < 0}. 674 */ 675 public TIFFField(TIFFTag tag, int value) { 676 if(tag == null) { 677 throw new NullPointerException("tag == null!"); 678 } 679 if (value < 0) { 680 throw new IllegalArgumentException("value < 0!"); 681 } 682 683 this.tag = tag; 684 this.tagNumber = tag.getNumber(); 685 this.count = 1; 686 687 if (value < 65536) { 688 if (!tag.isDataTypeOK(TIFFTag.TIFF_SHORT)) { 689 throw new IllegalArgumentException("Illegal data type " 690 + TIFFTag.TIFF_SHORT + " for " + tag.getName() + " tag"); 691 } 692 this.type = TIFFTag.TIFF_SHORT; 693 char[] cdata = new char[1]; 694 cdata[0] = (char)value; 695 this.data = cdata; 696 } else { 697 if (!tag.isDataTypeOK(TIFFTag.TIFF_LONG)) { 698 throw new IllegalArgumentException("Illegal data type " 699 + TIFFTag.TIFF_LONG + " for " + tag.getName() + " tag"); 700 } 701 this.type = TIFFTag.TIFF_LONG; 702 long[] ldata = new long[1]; 703 ldata[0] = value; 704 this.data = ldata; 705 } 706 } 707 708 /** 709 * Constructs a {@code TIFFField} with an IFD offset and contents. 710 * The offset will be stored as the data of this field as 711 * {@code long[] {offset}}. The directory will not be cloned. The count 712 * of the field will be unity. 713 * 714 * @param tag The tag to associated with this field. 715 * @param type One of the constants {@code TIFFTag.TIFF_LONG} or 716 * {@code TIFFTag.TIFF_IFD_POINTER}. 717 * @param offset The IFD offset. 718 * @param dir The directory. 719 * 720 * @throws NullPointerException if {@code tag == null}. 721 * @throws IllegalArgumentException if {@code type} is an unacceptable 722 * data type for the supplied {@code TIFFTag}. 723 * @throws IllegalArgumentException if {@code type} is neither 724 * {@code TIFFTag.TIFF_LONG} nor {@code TIFFTag.TIFF_IFD_POINTER}. 725 * @throws IllegalArgumentException if {@code offset <= 0}. 726 * @throws NullPointerException if {@code dir == null}. 727 * 728 * @see #TIFFField(TIFFTag,int,int,Object) 729 */ 730 public TIFFField(TIFFTag tag, int type, long offset, TIFFDirectory dir) { 731 if (tag == null) { 732 throw new NullPointerException("tag == null!"); 733 } else if (type < TIFFTag.MIN_DATATYPE || type > TIFFTag.MAX_DATATYPE) { 734 throw new IllegalArgumentException("Unknown data type "+type); 735 } else if (!tag.isDataTypeOK(type)) { 736 throw new IllegalArgumentException("Illegal data type " + type 737 + " for " + tag.getName() + " tag"); 738 } else if (type != TIFFTag.TIFF_LONG 739 && type != TIFFTag.TIFF_IFD_POINTER) { 740 throw new IllegalArgumentException("type " + type 741 + " is neither TIFFTag.TIFF_LONG nor TIFFTag.TIFF_IFD_POINTER"); 742 } else if (offset <= 0) { 743 throw new IllegalArgumentException("offset " + offset 744 + " is non-positive"); 745 } else if (dir == null) { 746 throw new NullPointerException("dir == null"); 747 } 748 749 this.tag = tag; 750 this.tagNumber = tag.getNumber(); 751 this.type = type; 752 this.count = 1; 753 this.data = new long[] {offset}; 754 755 this.dir = dir; 756 } 757 758 /** 759 * Retrieves the tag associated with this field. 760 * 761 * @return The associated {@code TIFFTag}. 762 */ 763 public TIFFTag getTag() { 764 return tag; 765 } 766 767 /** 768 * Retrieves the tag number in the range {@code [0,65535]}. 769 * 770 * @return The tag number. 771 */ 772 public int getTagNumber() { 773 return tagNumber; 774 } 775 776 /** 777 * Returns the type of the data stored in the field. For a TIFF 6.0 778 * stream, the value will equal one of the {@code TIFFTag.TIFF_*} 779 * constants. For future revisions of TIFF, higher values are possible. 780 * 781 * @return The data type of the field value. 782 */ 783 public int getType() { 784 return type; 785 } 786 787 /** 788 * Returns the name of the supplied data type constant. 789 * 790 * @param dataType One of the {@code TIFFTag.TIFF_*} constants 791 * indicating the data type of the field as written to the TIFF stream. 792 * @return The type name corresponding to the supplied type constant. 793 * @throws IllegalArgumentException if {@code dataType} is not 794 * one of the {@code TIFFTag.TIFF_*} data type constants. 795 */ 796 public static String getTypeName(int dataType) { 797 if (dataType < TIFFTag.MIN_DATATYPE || 798 dataType > TIFFTag.MAX_DATATYPE) { 799 throw new IllegalArgumentException("Unknown data type "+dataType); 800 } 801 802 return typeNames[dataType]; 803 } 804 805 /** 806 * Returns the data type constant corresponding to the supplied data 807 * type name. If the name is unknown {@code -1} will be returned. 808 * 809 * @param typeName The type name. 810 * @return One of the {@code TIFFTag.TIFF_*} constants or 811 * {@code -1} if the name is not recognized. 812 */ 813 public static int getTypeByName(String typeName) { 814 for (int i = TIFFTag.MIN_DATATYPE; i <= TIFFTag.MAX_DATATYPE; i++) { 815 if (typeName.equals(typeNames[i])) { 816 return i; 817 } 818 } 819 820 return -1; 821 } 822 823 /** 824 * Creates an array appropriate for the indicated data type. 825 * 826 * @param dataType One of the {@code TIFFTag.TIFF_*} data type 827 * constants. 828 * @param count The number of values in the array. 829 * @return An array appropriate for the specified data type. 830 * 831 * @throws IllegalArgumentException if {@code dataType} is not 832 * one of the {@code TIFFTag.TIFF_*} data type constants. 833 * @throws IllegalArgumentException if {@code count < 0}. 834 */ 835 public static Object createArrayForType(int dataType, int count) { 836 if(count < 0) { 837 throw new IllegalArgumentException("count < 0!"); 838 } 839 switch (dataType) { 840 case TIFFTag.TIFF_BYTE: 841 case TIFFTag.TIFF_SBYTE: 842 case TIFFTag.TIFF_UNDEFINED: 843 return new byte[count]; 844 case TIFFTag.TIFF_ASCII: 845 return new String[count]; 846 case TIFFTag.TIFF_SHORT: 847 return new char[count]; 848 case TIFFTag.TIFF_LONG: 849 case TIFFTag.TIFF_IFD_POINTER: 850 return new long[count]; 851 case TIFFTag.TIFF_RATIONAL: 852 return new long[count][2]; 853 case TIFFTag.TIFF_SSHORT: 854 return new short[count]; 855 case TIFFTag.TIFF_SLONG: 856 return new int[count]; 857 case TIFFTag.TIFF_SRATIONAL: 858 return new int[count][2]; 859 case TIFFTag.TIFF_FLOAT: 860 return new float[count]; 861 case TIFFTag.TIFF_DOUBLE: 862 return new double[count]; 863 default: 864 throw new IllegalArgumentException("Unknown data type "+dataType); 865 } 866 } 867 868 /** 869 * Returns the {@code TIFFField} as a node named either 870 * <tt>"TIFFField"</tt> or <tt>"TIFFIFD"</tt> as described in the 871 * TIFF native image metadata specification. The node will be named 872 * <tt>"TIFFIFD"</tt> if and only if {@link #hasDirectory()} returns 873 * {@code true} and the field's type is either {@link TIFFTag#TIFF_LONG} 874 * or {@link TIFFTag#TIFF_IFD_POINTER}. 875 * 876 * @return a {@code Node} named <tt>"TIFFField"</tt> or 877 * <tt>"TIFFIFD"</tt>. 878 */ 879 public Node getAsNativeNode() { 880 return new TIFFFieldNode(this); 881 } 882 883 /** 884 * Indicates whether the value associated with the field is of 885 * integral data type. 886 * 887 * @return Whether the field type is integral. 888 */ 889 public boolean isIntegral() { 890 return isIntegral[type]; 891 } 892 893 /** 894 * Returns the number of data items present in the field. For 895 * {@code TIFFTag.TIFF_ASCII} fields, the value returned is the 896 * number of {@code String}s, not the total length of the 897 * data as in the file representation. 898 * 899 * @return The number of data items present in the field. 900 */ 901 public int getCount() { 902 return count; 903 } 904 905 /** 906 * Returns a reference to the data object associated with the field. 907 * 908 * @return The data object of the field. 909 */ 910 public Object getData() { 911 return data; 912 } 913 914 /** 915 * Returns the data as an uninterpreted array of 916 * {@code byte}s. The type of the field must be one of 917 * {@code TIFFTag.TIFF_BYTE}, {@code TIFF_SBYTE}, or 918 * {@code TIFF_UNDEFINED}. 919 * 920 * <p> For data in {@code TIFFTag.TIFF_BYTE} format, the application 921 * must take care when promoting the data to longer integral types 922 * to avoid sign extension. 923 * 924 * @throws ClassCastException if the field is not of type 925 * {@code TIFF_BYTE}, {@code TIFF_SBYTE}, or 926 * {@code TIFF_UNDEFINED}. 927 * @return The data as an uninterpreted array of bytes. 928 */ 929 public byte[] getAsBytes() { 930 return (byte[])data; 931 } 932 933 /** 934 * Returns {@code TIFFTag.TIFF_SHORT} data as an array of 935 * {@code char}s (unsigned 16-bit integers). 936 * 937 * @throws ClassCastException if the field is not of type 938 * {@code TIFF_SHORT}. 939 * @return The data as an array of {@code char}s. 940 */ 941 public char[] getAsChars() { 942 return (char[])data; 943 } 944 945 /** 946 * Returns {@code TIFFTag.TIFF_SSHORT} data as an array of 947 * {@code short}s (signed 16-bit integers). 948 * 949 * @throws ClassCastException if the field is not of type 950 * {@code TIFF_SSHORT}. 951 * @return The data as an array of {@code short}s. 952 */ 953 public short[] getAsShorts() { 954 return (short[])data; 955 } 956 957 /** 958 * Returns {@code TIFFTag.TIFF_SLONG} data as an array of 959 * {@code int}s (signed 32-bit integers). 960 * 961 * @throws ClassCastException if the field is not of type 962 * {@code TIFF_SHORT}, {@code TIFF_SSHORT}, or 963 * {@code TIFF_SLONG}. 964 * @return The data as an array of {@code int}s. 965 */ 966 public int[] getAsInts() { 967 if (data instanceof int[]) { 968 return (int[])data; 969 } else if (data instanceof char[]){ 970 char[] cdata = (char[])data; 971 int[] idata = new int[cdata.length]; 972 for (int i = 0; i < cdata.length; i++) { 973 idata[i] = cdata[i] & 0xffff; 974 } 975 return idata; 976 } else if (data instanceof short[]){ 977 short[] sdata = (short[])data; 978 int[] idata = new int[sdata.length]; 979 for (int i = 0; i < sdata.length; i++) { 980 idata[i] = (int)sdata[i]; 981 } 982 return idata; 983 } else { 984 throw new ClassCastException("Data not char[], short[], or int[]!"); 985 } 986 } 987 988 /** 989 * Returns {@code TIFFTag.TIFF_LONG} or 990 * {@code TIFF_IFD_POINTER} data as an array of 991 * {@code long}s (signed 64-bit integers). 992 * 993 * @throws ClassCastException if the field is not of type 994 * {@code TIFF_LONG} or {@code TIFF_IFD_POINTER}. 995 * @return The data as an array of {@code long}s. 996 */ 997 public long[] getAsLongs() { 998 return (long[])data; 999 } 1000 1001 /** 1002 * Returns {@code TIFFTag.TIFF_FLOAT} data as an array of 1003 * {@code float}s (32-bit floating-point values). 1004 * 1005 * @throws ClassCastException if the field is not of type 1006 * {@code TIFF_FLOAT}. 1007 * @return The data as an array of {@code float}s. 1008 */ 1009 public float[] getAsFloats() { 1010 return (float[])data; 1011 } 1012 1013 /** 1014 * Returns {@code TIFFTag.TIFF_DOUBLE} data as an array of 1015 * {@code double}s (64-bit floating-point values). 1016 * 1017 * @throws ClassCastException if the field is not of type 1018 * {@code TIFF_DOUBLE}. 1019 * @return The data as an array of {@code double}s. 1020 */ 1021 public double[] getAsDoubles() { 1022 return (double[])data; 1023 } 1024 1025 /** 1026 * Returns {@code TIFFTag.TIFF_SRATIONAL} data as an array of 1027 * 2-element arrays of {@code int}s. 1028 * 1029 * @throws ClassCastException if the field is not of type 1030 * {@code TIFF_SRATIONAL}. 1031 * @return The data as an array of signed rationals. 1032 */ 1033 public int[][] getAsSRationals() { 1034 return (int[][])data; 1035 } 1036 1037 /** 1038 * Returns {@code TIFFTag.TIFF_RATIONAL} data as an array of 1039 * 2-element arrays of {@code long}s. 1040 * 1041 * @throws ClassCastException if the field is not of type 1042 * {@code TIFF_RATIONAL}. 1043 * @return The data as an array of unsigned rationals. 1044 */ 1045 public long[][] getAsRationals() { 1046 return (long[][])data; 1047 } 1048 1049 /** 1050 * Returns data in any format as an {@code int}. 1051 * 1052 * <p> {@code TIFFTag.TIFF_BYTE} values are treated as unsigned; that 1053 * is, no sign extension will take place and the returned value 1054 * will be in the range [0, 255]. {@code TIFF_SBYTE} data 1055 * will be returned in the range [-128, 127]. 1056 * 1057 * <p> A {@code TIFF_UNDEFINED} value is treated as though 1058 * it were a {@code TIFF_BYTE}. 1059 * 1060 * <p> Data in {@code TIFF_SLONG}, {@code TIFF_LONG}, 1061 * {@code TIFF_FLOAT}, {@code TIFF_DOUBLE} or 1062 * {@code TIFF_IFD_POINTER} format are simply cast to 1063 * {@code int} and may suffer from truncation. 1064 * 1065 * <p> Data in {@code TIFF_SRATIONAL} or 1066 * {@code TIFF_RATIONAL} format are evaluated by dividing the 1067 * numerator into the denominator using double-precision 1068 * arithmetic and then casting to {@code int}. Loss of 1069 * precision and truncation may occur. 1070 * 1071 * <p> Data in {@code TIFF_ASCII} format will be parsed as by 1072 * the {@code Double.parseDouble} method, with the result 1073 * case to {@code int}. 1074 * 1075 * @param index The index of the data. 1076 * @return The data at the given index as an {@code int}. 1077 */ 1078 public int getAsInt(int index) { 1079 switch (type) { 1080 case TIFFTag.TIFF_BYTE: 1081 case TIFFTag.TIFF_UNDEFINED: 1082 return ((byte[])data)[index] & 0xff; 1083 case TIFFTag.TIFF_SBYTE: 1084 return ((byte[])data)[index]; 1085 case TIFFTag.TIFF_SHORT: 1086 return ((char[])data)[index] & 0xffff; 1087 case TIFFTag.TIFF_SSHORT: 1088 return ((short[])data)[index]; 1089 case TIFFTag.TIFF_SLONG: 1090 return ((int[])data)[index]; 1091 case TIFFTag.TIFF_LONG: 1092 case TIFFTag.TIFF_IFD_POINTER: 1093 return (int)((long[])data)[index]; 1094 case TIFFTag.TIFF_FLOAT: 1095 return (int)((float[])data)[index]; 1096 case TIFFTag.TIFF_DOUBLE: 1097 return (int)((double[])data)[index]; 1098 case TIFFTag.TIFF_SRATIONAL: 1099 int[] ivalue = getAsSRational(index); 1100 return (int)((double)ivalue[0]/ivalue[1]); 1101 case TIFFTag.TIFF_RATIONAL: 1102 long[] lvalue = getAsRational(index); 1103 return (int)((double)lvalue[0]/lvalue[1]); 1104 case TIFFTag.TIFF_ASCII: 1105 String s = ((String[])data)[index]; 1106 return (int)Double.parseDouble(s); 1107 default: 1108 throw new ClassCastException(); // should never happen 1109 } 1110 } 1111 1112 /** 1113 * Returns data in any format as a {@code long}. 1114 * 1115 * <p> {@code TIFFTag.TIFF_BYTE} and {@code TIFF_UNDEFINED} data 1116 * are treated as unsigned; that is, no sign extension will take 1117 * place and the returned value will be in the range [0, 255]. 1118 * {@code TIFF_SBYTE} data will be returned in the range 1119 * [-128, 127]. 1120 * 1121 * <p> Data in {@code TIFF_FLOAT} and {@code TIFF_DOUBLE} are 1122 * simply cast to {@code long} and may suffer from truncation. 1123 * 1124 * <p> Data in {@code TIFF_SRATIONAL} or 1125 * {@code TIFF_RATIONAL} format are evaluated by dividing the 1126 * numerator into the denominator using double-precision 1127 * arithmetic and then casting to {@code long}. Loss of 1128 * precision and truncation may occur. 1129 * 1130 * <p> Data in {@code TIFF_ASCII} format will be parsed as by 1131 * the {@code Double.parseDouble} method, with the result 1132 * cast to {@code long}. 1133 * 1134 * @param index The index of the data. 1135 * @return The data at the given index as a {@code long}. 1136 */ 1137 public long getAsLong(int index) { 1138 switch (type) { 1139 case TIFFTag.TIFF_BYTE: 1140 case TIFFTag.TIFF_UNDEFINED: 1141 return ((byte[])data)[index] & 0xff; 1142 case TIFFTag.TIFF_SBYTE: 1143 return ((byte[])data)[index]; 1144 case TIFFTag.TIFF_SHORT: 1145 return ((char[])data)[index] & 0xffff; 1146 case TIFFTag.TIFF_SSHORT: 1147 return ((short[])data)[index]; 1148 case TIFFTag.TIFF_SLONG: 1149 return ((int[])data)[index]; 1150 case TIFFTag.TIFF_LONG: 1151 case TIFFTag.TIFF_IFD_POINTER: 1152 return ((long[])data)[index]; 1153 case TIFFTag.TIFF_FLOAT: 1154 return (long)((float[])data)[index]; 1155 case TIFFTag.TIFF_DOUBLE: 1156 return (long)((double[])data)[index]; 1157 case TIFFTag.TIFF_SRATIONAL: 1158 int[] ivalue = getAsSRational(index); 1159 return (long)((double)ivalue[0]/ivalue[1]); 1160 case TIFFTag.TIFF_RATIONAL: 1161 long[] lvalue = getAsRational(index); 1162 return (long)((double)lvalue[0]/lvalue[1]); 1163 case TIFFTag.TIFF_ASCII: 1164 String s = ((String[])data)[index]; 1165 return (long)Double.parseDouble(s); 1166 default: 1167 throw new ClassCastException(); // should never happen 1168 } 1169 } 1170 1171 /** 1172 * Returns data in any format as a {@code float}. 1173 * 1174 * <p> {@code TIFFTag.TIFF_BYTE} and {@code TIFF_UNDEFINED} data 1175 * are treated as unsigned; that is, no sign extension will take 1176 * place and the returned value will be in the range [0, 255]. 1177 * {@code TIFF_SBYTE} data will be returned in the range 1178 * [-128, 127]. 1179 * 1180 * <p> Data in {@code TIFF_SLONG}, {@code TIFF_LONG}, 1181 * {@code TIFF_DOUBLE}, or {@code TIFF_IFD_POINTER} format are 1182 * simply cast to {@code float} and may suffer from 1183 * truncation. 1184 * 1185 * <p> Data in {@code TIFF_SRATIONAL} or 1186 * {@code TIFF_RATIONAL} format are evaluated by dividing the 1187 * numerator into the denominator using double-precision 1188 * arithmetic and then casting to {@code float}. 1189 * 1190 * <p> Data in {@code TIFF_ASCII} format will be parsed as by 1191 * the {@code Double.parseDouble} method, with the result 1192 * cast to {@code float}. 1193 * 1194 * @param index The index of the data. 1195 * @return The data at the given index as a {@code float}. 1196 */ 1197 public float getAsFloat(int index) { 1198 switch (type) { 1199 case TIFFTag.TIFF_BYTE: 1200 case TIFFTag.TIFF_UNDEFINED: 1201 return ((byte[])data)[index] & 0xff; 1202 case TIFFTag.TIFF_SBYTE: 1203 return ((byte[])data)[index]; 1204 case TIFFTag.TIFF_SHORT: 1205 return ((char[])data)[index] & 0xffff; 1206 case TIFFTag.TIFF_SSHORT: 1207 return ((short[])data)[index]; 1208 case TIFFTag.TIFF_SLONG: 1209 return ((int[])data)[index]; 1210 case TIFFTag.TIFF_LONG: 1211 case TIFFTag.TIFF_IFD_POINTER: 1212 return ((long[])data)[index]; 1213 case TIFFTag.TIFF_FLOAT: 1214 return ((float[])data)[index]; 1215 case TIFFTag.TIFF_DOUBLE: 1216 return (float)((double[])data)[index]; 1217 case TIFFTag.TIFF_SRATIONAL: 1218 int[] ivalue = getAsSRational(index); 1219 return (float)((double)ivalue[0]/ivalue[1]); 1220 case TIFFTag.TIFF_RATIONAL: 1221 long[] lvalue = getAsRational(index); 1222 return (float)((double)lvalue[0]/lvalue[1]); 1223 case TIFFTag.TIFF_ASCII: 1224 String s = ((String[])data)[index]; 1225 return (float)Double.parseDouble(s); 1226 default: 1227 throw new ClassCastException(); // should never happen 1228 } 1229 } 1230 1231 /** 1232 * Returns data in any format as a {@code double}. 1233 * 1234 * <p> {@code TIFFTag.TIFF_BYTE} and {@code TIFF_UNDEFINED} data 1235 * are treated as unsigned; that is, no sign extension will take 1236 * place and the returned value will be in the range [0, 255]. 1237 * {@code TIFF_SBYTE} data will be returned in the range 1238 * [-128, 127]. 1239 * 1240 * <p> Data in {@code TIFF_SRATIONAL} or 1241 * {@code TIFF_RATIONAL} format are evaluated by dividing the 1242 * numerator into the denominator using double-precision 1243 * arithmetic. 1244 * 1245 * <p> Data in {@code TIFF_ASCII} format will be parsed as by 1246 * the {@code Double.parseDouble} method. 1247 * 1248 * @param index The index of the data. 1249 * @return The data at the given index as a {@code double}. 1250 */ 1251 public double getAsDouble(int index) { 1252 switch (type) { 1253 case TIFFTag.TIFF_BYTE: 1254 case TIFFTag.TIFF_UNDEFINED: 1255 return ((byte[])data)[index] & 0xff; 1256 case TIFFTag.TIFF_SBYTE: 1257 return ((byte[])data)[index]; 1258 case TIFFTag.TIFF_SHORT: 1259 return ((char[])data)[index] & 0xffff; 1260 case TIFFTag.TIFF_SSHORT: 1261 return ((short[])data)[index]; 1262 case TIFFTag.TIFF_SLONG: 1263 return ((int[])data)[index]; 1264 case TIFFTag.TIFF_LONG: 1265 case TIFFTag.TIFF_IFD_POINTER: 1266 return ((long[])data)[index]; 1267 case TIFFTag.TIFF_FLOAT: 1268 return ((float[])data)[index]; 1269 case TIFFTag.TIFF_DOUBLE: 1270 return ((double[])data)[index]; 1271 case TIFFTag.TIFF_SRATIONAL: 1272 int[] ivalue = getAsSRational(index); 1273 return (double)ivalue[0]/ivalue[1]; 1274 case TIFFTag.TIFF_RATIONAL: 1275 long[] lvalue = getAsRational(index); 1276 return (double)lvalue[0]/lvalue[1]; 1277 case TIFFTag.TIFF_ASCII: 1278 String s = ((String[])data)[index]; 1279 return Double.parseDouble(s); 1280 default: 1281 throw new ClassCastException(); // should never happen 1282 } 1283 } 1284 1285 /** 1286 * Returns a {@code TIFFTag.TIFF_ASCII} value as a 1287 * {@code String}. 1288 * 1289 * @throws ClassCastException if the field is not of type 1290 * {@code TIFF_ASCII}. 1291 * 1292 * @param index The index of the data. 1293 * @return The data at the given index as a {@code String}. 1294 */ 1295 public String getAsString(int index) { 1296 return ((String[])data)[index]; 1297 } 1298 1299 /** 1300 * Returns a {@code TIFFTag.TIFF_SRATIONAL} data item as a 1301 * two-element array of {@code int}s. 1302 * 1303 * @param index The index of the data. 1304 * @return The data at the given index as a signed rational. 1305 * @throws ClassCastException if the field is not of type 1306 * {@code TIFF_SRATIONAL}. 1307 */ 1308 public int[] getAsSRational(int index) { 1309 return ((int[][])data)[index]; 1310 } 1311 1312 /** 1313 * Returns a TIFFTag.TIFF_RATIONAL data item as a two-element array 1314 * of ints. 1315 * 1316 * @param index The index of the data. 1317 * @return The data at the given index as an unsigned rational. 1318 * @throws ClassCastException if the field is not of type 1319 * {@code TIFF_RATIONAL}. 1320 */ 1321 public long[] getAsRational(int index) { 1322 return ((long[][])data)[index]; 1323 } 1324 1325 1326 /** 1327 * Returns a {@code String} containing a human-readable 1328 * version of the data item. Data of type 1329 * {@code TIFFTag.TIFF_RATIONAL} or {@code TIFF_SRATIONAL} are 1330 * represented as a pair of integers separated by a 1331 * {@code '/'} character. If the numerator of a 1332 * {@code TIFFTag.TIFF_RATIONAL} or {@code TIFF_SRATIONAL} is an integral 1333 * multiple of the denominator, then the value is represented as 1334 * {@code "q/1"} where {@code q} is the quotient of the numerator and 1335 * denominator. 1336 * 1337 * @param index The index of the data. 1338 * @return The data at the given index as a {@code String}. 1339 * @throws ClassCastException if the field is not of one of the 1340 * legal field types. 1341 */ 1342 public String getValueAsString(int index) { 1343 switch (type) { 1344 case TIFFTag.TIFF_ASCII: 1345 return ((String[])data)[index]; 1346 case TIFFTag.TIFF_BYTE: 1347 case TIFFTag.TIFF_UNDEFINED: 1348 return Integer.toString(((byte[])data)[index] & 0xff); 1349 case TIFFTag.TIFF_SBYTE: 1350 return Integer.toString(((byte[])data)[index]); 1351 case TIFFTag.TIFF_SHORT: 1352 return Integer.toString(((char[])data)[index] & 0xffff); 1353 case TIFFTag.TIFF_SSHORT: 1354 return Integer.toString(((short[])data)[index]); 1355 case TIFFTag.TIFF_SLONG: 1356 return Integer.toString(((int[])data)[index]); 1357 case TIFFTag.TIFF_LONG: 1358 case TIFFTag.TIFF_IFD_POINTER: 1359 return Long.toString(((long[])data)[index]); 1360 case TIFFTag.TIFF_FLOAT: 1361 return Float.toString(((float[])data)[index]); 1362 case TIFFTag.TIFF_DOUBLE: 1363 return Double.toString(((double[])data)[index]); 1364 case TIFFTag.TIFF_SRATIONAL: 1365 int[] ivalue = getAsSRational(index); 1366 String srationalString; 1367 if(ivalue[1] != 0 && ivalue[0] % ivalue[1] == 0) { 1368 // If the denominator is a non-zero integral divisor 1369 // of the numerator then convert the fraction to be 1370 // with respect to a unity denominator. 1371 srationalString = 1372 Integer.toString(ivalue[0] / ivalue[1]) + "/1"; 1373 } else { 1374 // Use the values directly. 1375 srationalString = 1376 Integer.toString(ivalue[0]) + 1377 "/" + 1378 Integer.toString(ivalue[1]); 1379 } 1380 return srationalString; 1381 case TIFFTag.TIFF_RATIONAL: 1382 long[] lvalue = getAsRational(index); 1383 String rationalString; 1384 if(lvalue[1] != 0L && lvalue[0] % lvalue[1] == 0) { 1385 // If the denominator is a non-zero integral divisor 1386 // of the numerator then convert the fraction to be 1387 // with respect to a unity denominator. 1388 rationalString = 1389 Long.toString(lvalue[0] / lvalue[1]) + "/1"; 1390 } else { 1391 // Use the values directly. 1392 rationalString = 1393 Long.toString(lvalue[0]) + 1394 "/" + 1395 Long.toString(lvalue[1]); 1396 } 1397 return rationalString; 1398 default: 1399 throw new ClassCastException(); // should never happen 1400 } 1401 } 1402 1403 /** 1404 * Returns whether the field has a {@code TIFFDirectory}. 1405 * 1406 * @return true if and only if getDirectory() returns non-null. 1407 */ 1408 public boolean hasDirectory() { 1409 return getDirectory() != null; 1410 } 1411 1412 /** 1413 * Returns the associated {@code TIFFDirectory}, if available. If no 1414 * directory is set, then {@code null} will be returned. 1415 * 1416 * @return the TIFFDirectory instance or null. 1417 */ 1418 public TIFFDirectory getDirectory() { 1419 return dir; 1420 } 1421 1422 /** 1423 * Clones the field and all the information contained therein. 1424 * 1425 * @return A clone of this {@code TIFFField}. 1426 * @throws CloneNotSupportedException if the instance cannot be cloned. 1427 */ 1428 @Override 1429 public TIFFField clone() throws CloneNotSupportedException { 1430 TIFFField field = (TIFFField)super.clone(); 1431 1432 Object fieldData; 1433 switch (type) { 1434 case TIFFTag.TIFF_BYTE: 1435 case TIFFTag.TIFF_UNDEFINED: 1436 case TIFFTag.TIFF_SBYTE: 1437 fieldData = ((byte[])data).clone(); 1438 break; 1439 case TIFFTag.TIFF_SHORT: 1440 fieldData = ((char[])data).clone(); 1441 break; 1442 case TIFFTag.TIFF_SSHORT: 1443 fieldData = ((short[])data).clone(); 1444 break; 1445 case TIFFTag.TIFF_SLONG: 1446 fieldData = ((int[])data).clone(); 1447 break; 1448 case TIFFTag.TIFF_LONG: 1449 case TIFFTag.TIFF_IFD_POINTER: 1450 fieldData = ((long[])data).clone(); 1451 break; 1452 case TIFFTag.TIFF_FLOAT: 1453 fieldData = ((float[])data).clone(); 1454 break; 1455 case TIFFTag.TIFF_DOUBLE: 1456 fieldData = ((double[])data).clone(); 1457 break; 1458 case TIFFTag.TIFF_SRATIONAL: 1459 fieldData = ((int[][])data).clone(); 1460 break; 1461 case TIFFTag.TIFF_RATIONAL: 1462 fieldData = ((long[][])data).clone(); 1463 break; 1464 case TIFFTag.TIFF_ASCII: 1465 fieldData = ((String[])data).clone(); 1466 break; 1467 default: 1468 throw new ClassCastException(); // should never happen 1469 } 1470 1471 field.tag = tag; 1472 field.tagNumber = tagNumber; 1473 field.type = type; 1474 field.count = count; 1475 field.data = fieldData; 1476 field.dir = dir != null ? dir.clone() : null; 1477 1478 return field; 1479 } 1480 }