1 // NamespaceSupport.java - generic Namespace support for SAX. 2 // http://www.saxproject.org 3 // Written by David Megginson 4 // This class is in the Public Domain. NO WARRANTY! 5 // $Id: NamespaceSupport.java,v 1.15 2004/04/26 17:34:35 dmegginson Exp $ 6 7 package org.xml.sax.helpers; 8 9 import java.util.ArrayList; 10 import java.util.Collections; 11 import java.util.EmptyStackException; 12 import java.util.Enumeration; 13 import java.util.Hashtable; 14 15 /** 16 * Encapsulate Namespace logic for use by applications using SAX, 17 * or internally by SAX drivers. 18 * 19 * <blockquote> 20 * <em>This module, both source code and documentation, is in the 21 * Public Domain, and comes with <strong>NO WARRANTY</strong>.</em> 22 * See <a href='http://www.saxproject.org'>http://www.saxproject.org</a> 23 * for further information. 24 * </blockquote> 25 * 26 * <p>This class encapsulates the logic of Namespace processing: it 27 * tracks the declarations currently in force for each context and 28 * automatically processes qualified XML names into their Namespace 29 * parts; it can also be used in reverse for generating XML qnames 30 * from Namespaces.</p> 31 * 32 * <p>Namespace support objects are reusable, but the reset method 33 * must be invoked between each session.</p> 34 * 35 * <p>Here is a simple session:</p> 36 * 37 * <pre> 38 * String parts[] = new String[3]; 39 * NamespaceSupport support = new NamespaceSupport(); 40 * 41 * support.pushContext(); 42 * support.declarePrefix("", "http://www.w3.org/1999/xhtml"); 43 * support.declarePrefix("dc", "http://www.purl.org/dc#"); 44 * 45 * parts = support.processName("p", parts, false); 46 * System.out.println("Namespace URI: " + parts[0]); 47 * System.out.println("Local name: " + parts[1]); 48 * System.out.println("Raw name: " + parts[2]); 49 * 50 * parts = support.processName("dc:title", parts, false); 51 * System.out.println("Namespace URI: " + parts[0]); 52 * System.out.println("Local name: " + parts[1]); 53 * System.out.println("Raw name: " + parts[2]); 54 * 55 * support.popContext(); 56 * </pre> 57 * 58 * <p>Note that this class is optimized for the use case where most 59 * elements do not contain Namespace declarations: if the same 60 * prefix/URI mapping is repeated for each context (for example), this 61 * class will be somewhat less efficient.</p> 62 * 63 * <p>Although SAX drivers (parsers) may choose to use this class to 64 * implement namespace handling, they are not required to do so. 65 * Applications must track namespace information themselves if they 66 * want to use namespace information. 67 * 68 * @since SAX 2.0 69 * @author David Megginson 70 * @version 2.0.1 (sax2r2) 71 */ 72 public class NamespaceSupport 73 { 74 75 76 //////////////////////////////////////////////////////////////////// 77 // Constants. 78 //////////////////////////////////////////////////////////////////// 79 80 81 /** 82 * The XML Namespace URI as a constant. 83 * The value is <code>http://www.w3.org/XML/1998/namespace</code> 84 * as defined in the "Namespaces in XML" * recommendation. 85 * 86 * <p>This is the Namespace URI that is automatically mapped 87 * to the "xml" prefix.</p> 88 */ 89 public static final String XMLNS = 90 "http://www.w3.org/XML/1998/namespace"; 91 92 93 /** 94 * The namespace declaration URI as a constant. 95 * The value is <code>http://www.w3.org/xmlns/2000/</code>, as defined 96 * in a backwards-incompatible erratum to the "Namespaces in XML" 97 * recommendation. Because that erratum postdated SAX2, SAX2 defaults 98 * to the original recommendation, and does not normally use this URI. 99 * 100 * 101 * <p>This is the Namespace URI that is optionally applied to 102 * <em>xmlns</em> and <em>xmlns:*</em> attributes, which are used to 103 * declare namespaces. </p> 104 * 105 * @since SAX 2.1alpha 106 * @see #setNamespaceDeclUris 107 * @see #isNamespaceDeclUris 108 */ 109 public static final String NSDECL = 110 "http://www.w3.org/xmlns/2000/"; 111 112 113 /** 114 * An empty enumeration. 115 */ 116 private static final Enumeration EMPTY_ENUMERATION = Collections.enumeration(Collections.emptyList()); 117 118 119 //////////////////////////////////////////////////////////////////// 120 // Constructor. 121 //////////////////////////////////////////////////////////////////// 122 123 124 /** 125 * Create a new Namespace support object. 126 */ NamespaceSupport()127 public NamespaceSupport () 128 { 129 reset(); 130 } 131 132 133 134 //////////////////////////////////////////////////////////////////// 135 // Context management. 136 //////////////////////////////////////////////////////////////////// 137 138 139 /** 140 * Reset this Namespace support object for reuse. 141 * 142 * <p>It is necessary to invoke this method before reusing the 143 * Namespace support object for a new session. If namespace 144 * declaration URIs are to be supported, that flag must also 145 * be set to a non-default value. 146 * </p> 147 * 148 * @see #setNamespaceDeclUris 149 */ reset()150 public void reset () 151 { 152 contexts = new Context[32]; 153 namespaceDeclUris = false; 154 contextPos = 0; 155 contexts[contextPos] = currentContext = new Context(); 156 currentContext.declarePrefix("xml", XMLNS); 157 } 158 159 160 /** 161 * Start a new Namespace context. 162 * The new context will automatically inherit 163 * the declarations of its parent context, but it will also keep 164 * track of which declarations were made within this context. 165 * 166 * <p>Event callback code should start a new context once per element. 167 * This means being ready to call this in either of two places. 168 * For elements that don't include namespace declarations, the 169 * <em>ContentHandler.startElement()</em> callback is the right place. 170 * For elements with such a declaration, it'd done in the first 171 * <em>ContentHandler.startPrefixMapping()</em> callback. 172 * A boolean flag can be used to 173 * track whether a context has been started yet. When either of 174 * those methods is called, it checks the flag to see if a new context 175 * needs to be started. If so, it starts the context and sets the 176 * flag. After <em>ContentHandler.startElement()</em> 177 * does that, it always clears the flag. 178 * 179 * <p>Normally, SAX drivers would push a new context at the beginning 180 * of each XML element. Then they perform a first pass over the 181 * attributes to process all namespace declarations, making 182 * <em>ContentHandler.startPrefixMapping()</em> callbacks. 183 * Then a second pass is made, to determine the namespace-qualified 184 * names for all attributes and for the element name. 185 * Finally all the information for the 186 * <em>ContentHandler.startElement()</em> callback is available, 187 * so it can then be made. 188 * 189 * <p>The Namespace support object always starts with a base context 190 * already in force: in this context, only the "xml" prefix is 191 * declared.</p> 192 * 193 * @see org.xml.sax.ContentHandler 194 * @see #popContext 195 */ pushContext()196 public void pushContext () 197 { 198 int max = contexts.length; 199 200 contexts [contextPos].declsOK = false; 201 contextPos++; 202 203 // Extend the array if necessary 204 if (contextPos >= max) { 205 Context newContexts[] = new Context[max*2]; 206 System.arraycopy(contexts, 0, newContexts, 0, max); 207 max *= 2; 208 contexts = newContexts; 209 } 210 211 // Allocate the context if necessary. 212 currentContext = contexts[contextPos]; 213 if (currentContext == null) { 214 contexts[contextPos] = currentContext = new Context(); 215 } 216 217 // Set the parent, if any. 218 if (contextPos > 0) { 219 currentContext.setParent(contexts[contextPos - 1]); 220 } 221 } 222 223 224 /** 225 * Revert to the previous Namespace context. 226 * 227 * <p>Normally, you should pop the context at the end of each 228 * XML element. After popping the context, all Namespace prefix 229 * mappings that were previously in force are restored.</p> 230 * 231 * <p>You must not attempt to declare additional Namespace 232 * prefixes after popping a context, unless you push another 233 * context first.</p> 234 * 235 * @see #pushContext 236 */ popContext()237 public void popContext () 238 { 239 contexts[contextPos].clear(); 240 contextPos--; 241 if (contextPos < 0) { 242 throw new EmptyStackException(); 243 } 244 currentContext = contexts[contextPos]; 245 } 246 247 248 249 //////////////////////////////////////////////////////////////////// 250 // Operations within a context. 251 //////////////////////////////////////////////////////////////////// 252 253 254 /** 255 * Declare a Namespace prefix. All prefixes must be declared 256 * before they are referenced. For example, a SAX driver (parser) 257 * would scan an element's attributes 258 * in two passes: first for namespace declarations, 259 * then a second pass using {@link #processName processName()} to 260 * interpret prefixes against (potentially redefined) prefixes. 261 * 262 * <p>This method declares a prefix in the current Namespace 263 * context; the prefix will remain in force until this context 264 * is popped, unless it is shadowed in a descendant context.</p> 265 * 266 * <p>To declare the default element Namespace, use the empty string as 267 * the prefix.</p> 268 * 269 * <p>Note that you must <em>not</em> declare a prefix after 270 * you've pushed and popped another Namespace context, or 271 * treated the declarations phase as complete by processing 272 * a prefixed name.</p> 273 * 274 * <p>Note that there is an asymmetry in this library: {@link 275 * #getPrefix getPrefix} will not return the "" prefix, 276 * even if you have declared a default element namespace. 277 * To check for a default namespace, 278 * you have to look it up explicitly using {@link #getURI getURI}. 279 * This asymmetry exists to make it easier to look up prefixes 280 * for attribute names, where the default prefix is not allowed.</p> 281 * 282 * @param prefix The prefix to declare, or the empty string to 283 * indicate the default element namespace. This may never have 284 * the value "xml" or "xmlns". 285 * @param uri The Namespace URI to associate with the prefix. 286 * @return true if the prefix was legal, false otherwise 287 * 288 * @see #processName 289 * @see #getURI 290 * @see #getPrefix 291 */ declarePrefix(String prefix, String uri)292 public boolean declarePrefix (String prefix, String uri) 293 { 294 if (prefix.equals("xml") || prefix.equals("xmlns")) { 295 return false; 296 } else { 297 currentContext.declarePrefix(prefix, uri); 298 return true; 299 } 300 } 301 302 303 /** 304 * Process a raw XML qualified name, after all declarations in the 305 * current context have been handled by {@link #declarePrefix 306 * declarePrefix()}. 307 * 308 * <p>This method processes a raw XML qualified name in the 309 * current context by removing the prefix and looking it up among 310 * the prefixes currently declared. The return value will be the 311 * array supplied by the caller, filled in as follows:</p> 312 * 313 * <dl> 314 * <dt>parts[0]</dt> 315 * <dd>The Namespace URI, or an empty string if none is 316 * in use.</dd> 317 * <dt>parts[1]</dt> 318 * <dd>The local name (without prefix).</dd> 319 * <dt>parts[2]</dt> 320 * <dd>The original raw name.</dd> 321 * </dl> 322 * 323 * <p>All of the strings in the array will be internalized. If 324 * the raw name has a prefix that has not been declared, then 325 * the return value will be null.</p> 326 * 327 * <p>Note that attribute names are processed differently than 328 * element names: an unprefixed element name will receive the 329 * default Namespace (if any), while an unprefixed attribute name 330 * will not.</p> 331 * 332 * @param qName The XML qualified name to be processed. 333 * @param parts An array supplied by the caller, capable of 334 * holding at least three members. 335 * @param isAttribute A flag indicating whether this is an 336 * attribute name (true) or an element name (false). 337 * @return The supplied array holding three internalized strings 338 * representing the Namespace URI (or empty string), the 339 * local name, and the XML qualified name; or null if there 340 * is an undeclared prefix. 341 * @see #declarePrefix 342 * @see java.lang.String#intern */ processName(String qName, String parts[], boolean isAttribute)343 public String [] processName (String qName, String parts[], 344 boolean isAttribute) 345 { 346 String myParts[] = currentContext.processName(qName, isAttribute); 347 if (myParts == null) { 348 return null; 349 } else { 350 parts[0] = myParts[0]; 351 parts[1] = myParts[1]; 352 parts[2] = myParts[2]; 353 return parts; 354 } 355 } 356 357 358 /** 359 * Look up a prefix and get the currently-mapped Namespace URI. 360 * 361 * <p>This method looks up the prefix in the current context. 362 * Use the empty string ("") for the default Namespace.</p> 363 * 364 * @param prefix The prefix to look up. 365 * @return The associated Namespace URI, or null if the prefix 366 * is undeclared in this context. 367 * @see #getPrefix 368 * @see #getPrefixes 369 */ getURI(String prefix)370 public String getURI (String prefix) 371 { 372 return currentContext.getURI(prefix); 373 } 374 375 376 /** 377 * Return an enumeration of all prefixes whose declarations are 378 * active in the current context. 379 * This includes declarations from parent contexts that have 380 * not been overridden. 381 * 382 * <p><strong>Note:</strong> if there is a default prefix, it will not be 383 * returned in this enumeration; check for the default prefix 384 * using the {@link #getURI getURI} with an argument of "".</p> 385 * 386 * @return An enumeration of prefixes (never empty). 387 * @see #getDeclaredPrefixes 388 * @see #getURI 389 */ getPrefixes()390 public Enumeration getPrefixes () 391 { 392 return currentContext.getPrefixes(); 393 } 394 395 396 /** 397 * Return one of the prefixes mapped to a Namespace URI. 398 * 399 * <p>If more than one prefix is currently mapped to the same 400 * URI, this method will make an arbitrary selection; if you 401 * want all of the prefixes, use the {@link #getPrefixes} 402 * method instead.</p> 403 * 404 * <p><strong>Note:</strong> this will never return the empty (default) prefix; 405 * to check for a default prefix, use the {@link #getURI getURI} 406 * method with an argument of "".</p> 407 * 408 * @param uri the namespace URI 409 * @return one of the prefixes currently mapped to the URI supplied, 410 * or null if none is mapped or if the URI is assigned to 411 * the default namespace 412 * @see #getPrefixes(java.lang.String) 413 * @see #getURI 414 */ getPrefix(String uri)415 public String getPrefix (String uri) 416 { 417 return currentContext.getPrefix(uri); 418 } 419 420 421 /** 422 * Return an enumeration of all prefixes for a given URI whose 423 * declarations are active in the current context. 424 * This includes declarations from parent contexts that have 425 * not been overridden. 426 * 427 * <p>This method returns prefixes mapped to a specific Namespace 428 * URI. The xml: prefix will be included. If you want only one 429 * prefix that's mapped to the Namespace URI, and you don't care 430 * which one you get, use the {@link #getPrefix getPrefix} 431 * method instead.</p> 432 * 433 * <p><strong>Note:</strong> the empty (default) prefix is <em>never</em> included 434 * in this enumeration; to check for the presence of a default 435 * Namespace, use the {@link #getURI getURI} method with an 436 * argument of "".</p> 437 * 438 * @param uri The Namespace URI. 439 * @return An enumeration of prefixes (never empty). 440 * @see #getPrefix 441 * @see #getDeclaredPrefixes 442 * @see #getURI 443 */ getPrefixes(String uri)444 public Enumeration getPrefixes(String uri) { 445 ArrayList<String> prefixes = new ArrayList<String>(); 446 Enumeration allPrefixes = getPrefixes(); 447 while (allPrefixes.hasMoreElements()) { 448 String prefix = (String) allPrefixes.nextElement(); 449 if (uri.equals(getURI(prefix))) { 450 prefixes.add(prefix); 451 } 452 } 453 return Collections.enumeration(prefixes); 454 } 455 456 457 /** 458 * Return an enumeration of all prefixes declared in this context. 459 * 460 * <p>The empty (default) prefix will be included in this 461 * enumeration; note that this behaviour differs from that of 462 * {@link #getPrefix} and {@link #getPrefixes}.</p> 463 * 464 * @return An enumeration of all prefixes declared in this 465 * context. 466 * @see #getPrefixes 467 * @see #getURI 468 */ getDeclaredPrefixes()469 public Enumeration getDeclaredPrefixes () 470 { 471 return currentContext.getDeclaredPrefixes(); 472 } 473 474 /** 475 * Controls whether namespace declaration attributes are placed 476 * into the {@link #NSDECL NSDECL} namespace 477 * by {@link #processName processName()}. This may only be 478 * changed before any contexts have been pushed. 479 * 480 * @param value the namespace declaration attribute state. A value of true 481 * enables this feature, a value of false disables it. 482 * 483 * @since SAX 2.1alpha 484 * 485 * @exception IllegalStateException when attempting to set this 486 * after any context has been pushed. 487 */ setNamespaceDeclUris(boolean value)488 public void setNamespaceDeclUris (boolean value) 489 { 490 if (contextPos != 0) 491 throw new IllegalStateException (); 492 if (value == namespaceDeclUris) 493 return; 494 namespaceDeclUris = value; 495 if (value) 496 currentContext.declarePrefix ("xmlns", NSDECL); 497 else { 498 contexts[contextPos] = currentContext = new Context(); 499 currentContext.declarePrefix("xml", XMLNS); 500 } 501 } 502 503 /** 504 * Returns true if namespace declaration attributes are placed into 505 * a namespace. This behavior is not the default. 506 * 507 * @return true if namespace declaration attributes are enabled, false 508 * otherwise. 509 * @since SAX 2.1alpha 510 */ isNamespaceDeclUris()511 public boolean isNamespaceDeclUris () 512 { return namespaceDeclUris; } 513 514 515 516 //////////////////////////////////////////////////////////////////// 517 // Internal state. 518 //////////////////////////////////////////////////////////////////// 519 520 private Context contexts[]; 521 private Context currentContext; 522 private int contextPos; 523 private boolean namespaceDeclUris; 524 525 526 //////////////////////////////////////////////////////////////////// 527 // Internal classes. 528 //////////////////////////////////////////////////////////////////// 529 530 /** 531 * Internal class for a single Namespace context. 532 * 533 * <p>This module caches and reuses Namespace contexts, 534 * so the number allocated 535 * will be equal to the element depth of the document, not to the total 536 * number of elements (i.e. 5-10 rather than tens of thousands). 537 * Also, data structures used to represent contexts are shared when 538 * possible (child contexts without declarations) to further reduce 539 * the amount of memory that's consumed. 540 * </p> 541 */ 542 final class Context { 543 544 /** 545 * Create the root-level Namespace context. 546 */ Context()547 Context () 548 { 549 copyTables(); 550 } 551 552 553 /** 554 * (Re)set the parent of this Namespace context. 555 * The context must either have been freshly constructed, 556 * or must have been cleared. 557 * 558 * @param context The parent Namespace context object. 559 */ setParent(Context parent)560 void setParent (Context parent) 561 { 562 this.parent = parent; 563 declarations = null; 564 prefixTable = parent.prefixTable; 565 uriTable = parent.uriTable; 566 elementNameTable = parent.elementNameTable; 567 attributeNameTable = parent.attributeNameTable; 568 defaultNS = parent.defaultNS; 569 declSeen = false; 570 declsOK = true; 571 } 572 573 /** 574 * Makes associated state become collectible, 575 * invalidating this context. 576 * {@link #setParent} must be called before 577 * this context may be used again. 578 */ clear()579 void clear () 580 { 581 parent = null; 582 prefixTable = null; 583 uriTable = null; 584 elementNameTable = null; 585 attributeNameTable = null; 586 defaultNS = null; 587 } 588 589 590 /** 591 * Declare a Namespace prefix for this context. 592 * 593 * @param prefix The prefix to declare. 594 * @param uri The associated Namespace URI. 595 * @see org.xml.sax.helpers.NamespaceSupport#declarePrefix 596 */ declarePrefix(String prefix, String uri)597 void declarePrefix(String prefix, String uri) { 598 // Lazy processing... 599 if (!declsOK) { 600 throw new IllegalStateException ("can't declare any more prefixes in this context"); 601 } 602 if (!declSeen) { 603 copyTables(); 604 } 605 if (declarations == null) { 606 declarations = new ArrayList<String>(); 607 } 608 609 prefix = prefix.intern(); 610 uri = uri.intern(); 611 if ("".equals(prefix)) { 612 if ("".equals(uri)) { 613 defaultNS = null; 614 } else { 615 defaultNS = uri; 616 } 617 } else { 618 prefixTable.put(prefix, uri); 619 uriTable.put(uri, prefix); // may wipe out another prefix 620 } 621 declarations.add(prefix); 622 } 623 624 625 /** 626 * Process an XML qualified name in this context. 627 * 628 * @param qName The XML qualified name. 629 * @param isAttribute true if this is an attribute name. 630 * @return An array of three strings containing the 631 * URI part (or empty string), the local part, 632 * and the raw name, all internalized, or null 633 * if there is an undeclared prefix. 634 * @see org.xml.sax.helpers.NamespaceSupport#processName 635 */ processName(String qName, boolean isAttribute)636 String [] processName (String qName, boolean isAttribute) 637 { 638 String name[]; 639 Hashtable table; 640 641 // detect errors in call sequence 642 declsOK = false; 643 644 // Select the appropriate table. 645 if (isAttribute) { 646 table = attributeNameTable; 647 } else { 648 table = elementNameTable; 649 } 650 651 // Start by looking in the cache, and 652 // return immediately if the name 653 // is already known in this content 654 name = (String[])table.get(qName); 655 if (name != null) { 656 return name; 657 } 658 659 // We haven't seen this name in this 660 // context before. Maybe in the parent 661 // context, but we can't assume prefix 662 // bindings are the same. 663 name = new String[3]; 664 name[2] = qName.intern(); 665 int index = qName.indexOf(':'); 666 667 668 // No prefix. 669 if (index == -1) { 670 if (isAttribute) { 671 if (qName == "xmlns" && namespaceDeclUris) 672 name[0] = NSDECL; 673 else 674 name[0] = ""; 675 } else if (defaultNS == null) { 676 name[0] = ""; 677 } else { 678 name[0] = defaultNS; 679 } 680 name[1] = name[2]; 681 } 682 683 // Prefix 684 else { 685 String prefix = qName.substring(0, index); 686 String local = qName.substring(index+1); 687 String uri; 688 if ("".equals(prefix)) { 689 uri = defaultNS; 690 } else { 691 uri = (String)prefixTable.get(prefix); 692 } 693 if (uri == null 694 || (!isAttribute && "xmlns".equals (prefix))) { 695 return null; 696 } 697 name[0] = uri; 698 name[1] = local.intern(); 699 } 700 701 // Save in the cache for future use. 702 // (Could be shared with parent context...) 703 table.put(name[2], name); 704 return name; 705 } 706 707 708 /** 709 * Look up the URI associated with a prefix in this context. 710 * 711 * @param prefix The prefix to look up. 712 * @return The associated Namespace URI, or null if none is 713 * declared. 714 * @see org.xml.sax.helpers.NamespaceSupport#getURI 715 */ getURI(String prefix)716 String getURI (String prefix) 717 { 718 if ("".equals(prefix)) { 719 return defaultNS; 720 } else if (prefixTable == null) { 721 return null; 722 } else { 723 return (String)prefixTable.get(prefix); 724 } 725 } 726 727 728 /** 729 * Look up one of the prefixes associated with a URI in this context. 730 * 731 * <p>Since many prefixes may be mapped to the same URI, 732 * the return value may be unreliable.</p> 733 * 734 * @param uri The URI to look up. 735 * @return The associated prefix, or null if none is declared. 736 * @see org.xml.sax.helpers.NamespaceSupport#getPrefix 737 */ getPrefix(String uri)738 String getPrefix (String uri) 739 { 740 if (uriTable == null) { 741 return null; 742 } else { 743 return (String)uriTable.get(uri); 744 } 745 } 746 747 748 /** 749 * Return an enumeration of prefixes declared in this context. 750 * 751 * @return An enumeration of prefixes (possibly empty). 752 * @see org.xml.sax.helpers.NamespaceSupport#getDeclaredPrefixes 753 */ getDeclaredPrefixes()754 Enumeration getDeclaredPrefixes() { 755 return (declarations == null) ? EMPTY_ENUMERATION : Collections.enumeration(declarations); 756 } 757 758 759 /** 760 * Return an enumeration of all prefixes currently in force. 761 * 762 * <p>The default prefix, if in force, is <em>not</em> 763 * returned, and will have to be checked for separately.</p> 764 * 765 * @return An enumeration of prefixes (never empty). 766 * @see org.xml.sax.helpers.NamespaceSupport#getPrefixes 767 */ getPrefixes()768 Enumeration getPrefixes () 769 { 770 if (prefixTable == null) { 771 return EMPTY_ENUMERATION; 772 } else { 773 return prefixTable.keys(); 774 } 775 } 776 777 778 779 //////////////////////////////////////////////////////////////// 780 // Internal methods. 781 //////////////////////////////////////////////////////////////// 782 783 784 /** 785 * Copy on write for the internal tables in this context. 786 * 787 * <p>This class is optimized for the normal case where most 788 * elements do not contain Namespace declarations.</p> 789 */ copyTables()790 private void copyTables () 791 { 792 if (prefixTable != null) { 793 prefixTable = (Hashtable)prefixTable.clone(); 794 } else { 795 prefixTable = new Hashtable(); 796 } 797 if (uriTable != null) { 798 uriTable = (Hashtable)uriTable.clone(); 799 } else { 800 uriTable = new Hashtable(); 801 } 802 elementNameTable = new Hashtable(); 803 attributeNameTable = new Hashtable(); 804 declSeen = true; 805 } 806 807 808 809 //////////////////////////////////////////////////////////////// 810 // Protected state. 811 //////////////////////////////////////////////////////////////// 812 813 Hashtable prefixTable; 814 Hashtable uriTable; 815 Hashtable elementNameTable; 816 Hashtable attributeNameTable; 817 String defaultNS = null; 818 boolean declsOK = true; 819 820 821 822 //////////////////////////////////////////////////////////////// 823 // Internal state. 824 //////////////////////////////////////////////////////////////// 825 826 private ArrayList<String> declarations = null; 827 private boolean declSeen = false; 828 private Context parent = null; 829 } 830 } 831 832 // end of NamespaceSupport.java 833