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 android.compat.annotation.UnsupportedAppUsage; 10 import java.util.ArrayList; 11 import java.util.Collections; 12 import java.util.EmptyStackException; 13 import java.util.Enumeration; 14 import java.util.Hashtable; 15 16 /** 17 * Encapsulate Namespace logic for use by applications using SAX, 18 * or internally by SAX drivers. 19 * 20 * <blockquote> 21 * <em>This module, both source code and documentation, is in the 22 * Public Domain, and comes with <strong>NO WARRANTY</strong>.</em> 23 * See <a href='http://www.saxproject.org'>http://www.saxproject.org</a> 24 * for further information. 25 * </blockquote> 26 * 27 * <p>This class encapsulates the logic of Namespace processing: it 28 * tracks the declarations currently in force for each context and 29 * automatically processes qualified XML names into their Namespace 30 * parts; it can also be used in reverse for generating XML qnames 31 * from Namespaces.</p> 32 * 33 * <p>Namespace support objects are reusable, but the reset method 34 * must be invoked between each session.</p> 35 * 36 * <p>Here is a simple session:</p> 37 * 38 * <pre> 39 * String parts[] = new String[3]; 40 * NamespaceSupport support = new NamespaceSupport(); 41 * 42 * support.pushContext(); 43 * support.declarePrefix("", "http://www.w3.org/1999/xhtml"); 44 * support.declarePrefix("dc", "http://www.purl.org/dc#"); 45 * 46 * parts = support.processName("p", parts, false); 47 * System.out.println("Namespace URI: " + parts[0]); 48 * System.out.println("Local name: " + parts[1]); 49 * System.out.println("Raw name: " + parts[2]); 50 * 51 * parts = support.processName("dc:title", parts, false); 52 * System.out.println("Namespace URI: " + parts[0]); 53 * System.out.println("Local name: " + parts[1]); 54 * System.out.println("Raw name: " + parts[2]); 55 * 56 * support.popContext(); 57 * </pre> 58 * 59 * <p>Note that this class is optimized for the use case where most 60 * elements do not contain Namespace declarations: if the same 61 * prefix/URI mapping is repeated for each context (for example), this 62 * class will be somewhat less efficient.</p> 63 * 64 * <p>Although SAX drivers (parsers) may choose to use this class to 65 * implement namespace handling, they are not required to do so. 66 * Applications must track namespace information themselves if they 67 * want to use namespace information. 68 * 69 * @since SAX 2.0 70 * @author David Megginson 71 * @version 2.0.1 (sax2r2) 72 */ 73 public class NamespaceSupport 74 { 75 76 77 //////////////////////////////////////////////////////////////////// 78 // Constants. 79 //////////////////////////////////////////////////////////////////// 80 81 82 /** 83 * The XML Namespace URI as a constant. 84 * The value is <code>http://www.w3.org/XML/1998/namespace</code> 85 * as defined in the "Namespaces in XML" * recommendation. 86 * 87 * <p>This is the Namespace URI that is automatically mapped 88 * to the "xml" prefix.</p> 89 */ 90 public static final String XMLNS = 91 "http://www.w3.org/XML/1998/namespace"; 92 93 94 /** 95 * The namespace declaration URI as a constant. 96 * The value is <code>http://www.w3.org/xmlns/2000/</code>, as defined 97 * in a backwards-incompatible erratum to the "Namespaces in XML" 98 * recommendation. Because that erratum postdated SAX2, SAX2 defaults 99 * to the original recommendation, and does not normally use this URI. 100 * 101 * 102 * <p>This is the Namespace URI that is optionally applied to 103 * <em>xmlns</em> and <em>xmlns:*</em> attributes, which are used to 104 * declare namespaces. </p> 105 * 106 * @since SAX 2.1alpha 107 * @see #setNamespaceDeclUris 108 * @see #isNamespaceDeclUris 109 */ 110 public static final String NSDECL = 111 "http://www.w3.org/xmlns/2000/"; 112 113 114 /** 115 * An empty enumeration. 116 */ 117 @UnsupportedAppUsage 118 private static final Enumeration EMPTY_ENUMERATION = Collections.enumeration(Collections.emptyList()); 119 120 121 //////////////////////////////////////////////////////////////////// 122 // Constructor. 123 //////////////////////////////////////////////////////////////////// 124 125 126 /** 127 * Create a new Namespace support object. 128 */ NamespaceSupport()129 public NamespaceSupport () 130 { 131 reset(); 132 } 133 134 135 136 //////////////////////////////////////////////////////////////////// 137 // Context management. 138 //////////////////////////////////////////////////////////////////// 139 140 141 /** 142 * Reset this Namespace support object for reuse. 143 * 144 * <p>It is necessary to invoke this method before reusing the 145 * Namespace support object for a new session. If namespace 146 * declaration URIs are to be supported, that flag must also 147 * be set to a non-default value. 148 * </p> 149 * 150 * @see #setNamespaceDeclUris 151 */ reset()152 public void reset () 153 { 154 contexts = new Context[32]; 155 namespaceDeclUris = false; 156 contextPos = 0; 157 contexts[contextPos] = currentContext = new Context(); 158 currentContext.declarePrefix("xml", XMLNS); 159 } 160 161 162 /** 163 * Start a new Namespace context. 164 * The new context will automatically inherit 165 * the declarations of its parent context, but it will also keep 166 * track of which declarations were made within this context. 167 * 168 * <p>Event callback code should start a new context once per element. 169 * This means being ready to call this in either of two places. 170 * For elements that don't include namespace declarations, the 171 * <em>ContentHandler.startElement()</em> callback is the right place. 172 * For elements with such a declaration, it'd done in the first 173 * <em>ContentHandler.startPrefixMapping()</em> callback. 174 * A boolean flag can be used to 175 * track whether a context has been started yet. When either of 176 * those methods is called, it checks the flag to see if a new context 177 * needs to be started. If so, it starts the context and sets the 178 * flag. After <em>ContentHandler.startElement()</em> 179 * does that, it always clears the flag. 180 * 181 * <p>Normally, SAX drivers would push a new context at the beginning 182 * of each XML element. Then they perform a first pass over the 183 * attributes to process all namespace declarations, making 184 * <em>ContentHandler.startPrefixMapping()</em> callbacks. 185 * Then a second pass is made, to determine the namespace-qualified 186 * names for all attributes and for the element name. 187 * Finally all the information for the 188 * <em>ContentHandler.startElement()</em> callback is available, 189 * so it can then be made. 190 * 191 * <p>The Namespace support object always starts with a base context 192 * already in force: in this context, only the "xml" prefix is 193 * declared.</p> 194 * 195 * @see org.xml.sax.ContentHandler 196 * @see #popContext 197 */ pushContext()198 public void pushContext () 199 { 200 int max = contexts.length; 201 202 contexts [contextPos].declsOK = false; 203 contextPos++; 204 205 // Extend the array if necessary 206 if (contextPos >= max) { 207 Context newContexts[] = new Context[max*2]; 208 System.arraycopy(contexts, 0, newContexts, 0, max); 209 max *= 2; 210 contexts = newContexts; 211 } 212 213 // Allocate the context if necessary. 214 currentContext = contexts[contextPos]; 215 if (currentContext == null) { 216 contexts[contextPos] = currentContext = new Context(); 217 } 218 219 // Set the parent, if any. 220 if (contextPos > 0) { 221 currentContext.setParent(contexts[contextPos - 1]); 222 } 223 } 224 225 226 /** 227 * Revert to the previous Namespace context. 228 * 229 * <p>Normally, you should pop the context at the end of each 230 * XML element. After popping the context, all Namespace prefix 231 * mappings that were previously in force are restored.</p> 232 * 233 * <p>You must not attempt to declare additional Namespace 234 * prefixes after popping a context, unless you push another 235 * context first.</p> 236 * 237 * @see #pushContext 238 */ popContext()239 public void popContext () 240 { 241 contexts[contextPos].clear(); 242 contextPos--; 243 if (contextPos < 0) { 244 throw new EmptyStackException(); 245 } 246 currentContext = contexts[contextPos]; 247 } 248 249 250 251 //////////////////////////////////////////////////////////////////// 252 // Operations within a context. 253 //////////////////////////////////////////////////////////////////// 254 255 256 /** 257 * Declare a Namespace prefix. All prefixes must be declared 258 * before they are referenced. For example, a SAX driver (parser) 259 * would scan an element's attributes 260 * in two passes: first for namespace declarations, 261 * then a second pass using {@link #processName processName()} to 262 * interpret prefixes against (potentially redefined) prefixes. 263 * 264 * <p>This method declares a prefix in the current Namespace 265 * context; the prefix will remain in force until this context 266 * is popped, unless it is shadowed in a descendant context.</p> 267 * 268 * <p>To declare the default element Namespace, use the empty string as 269 * the prefix.</p> 270 * 271 * <p>Note that you must <em>not</em> declare a prefix after 272 * you've pushed and popped another Namespace context, or 273 * treated the declarations phase as complete by processing 274 * a prefixed name.</p> 275 * 276 * <p>Note that there is an asymmetry in this library: {@link 277 * #getPrefix getPrefix} will not return the "" prefix, 278 * even if you have declared a default element namespace. 279 * To check for a default namespace, 280 * you have to look it up explicitly using {@link #getURI getURI}. 281 * This asymmetry exists to make it easier to look up prefixes 282 * for attribute names, where the default prefix is not allowed.</p> 283 * 284 * @param prefix The prefix to declare, or the empty string to 285 * indicate the default element namespace. This may never have 286 * the value "xml" or "xmlns". 287 * @param uri The Namespace URI to associate with the prefix. 288 * @return true if the prefix was legal, false otherwise 289 * 290 * @see #processName 291 * @see #getURI 292 * @see #getPrefix 293 */ declarePrefix(String prefix, String uri)294 public boolean declarePrefix (String prefix, String uri) 295 { 296 if (prefix.equals("xml") || prefix.equals("xmlns")) { 297 return false; 298 } else { 299 currentContext.declarePrefix(prefix, uri); 300 return true; 301 } 302 } 303 304 305 /** 306 * Process a raw XML qualified name, after all declarations in the 307 * current context have been handled by {@link #declarePrefix 308 * declarePrefix()}. 309 * 310 * <p>This method processes a raw XML qualified name in the 311 * current context by removing the prefix and looking it up among 312 * the prefixes currently declared. The return value will be the 313 * array supplied by the caller, filled in as follows:</p> 314 * 315 * <dl> 316 * <dt>parts[0]</dt> 317 * <dd>The Namespace URI, or an empty string if none is 318 * in use.</dd> 319 * <dt>parts[1]</dt> 320 * <dd>The local name (without prefix).</dd> 321 * <dt>parts[2]</dt> 322 * <dd>The original raw name.</dd> 323 * </dl> 324 * 325 * <p>All of the strings in the array will be internalized. If 326 * the raw name has a prefix that has not been declared, then 327 * the return value will be null.</p> 328 * 329 * <p>Note that attribute names are processed differently than 330 * element names: an unprefixed element name will receive the 331 * default Namespace (if any), while an unprefixed attribute name 332 * will not.</p> 333 * 334 * @param qName The XML qualified name to be processed. 335 * @param parts An array supplied by the caller, capable of 336 * holding at least three members. 337 * @param isAttribute A flag indicating whether this is an 338 * attribute name (true) or an element name (false). 339 * @return The supplied array holding three internalized strings 340 * representing the Namespace URI (or empty string), the 341 * local name, and the XML qualified name; or null if there 342 * is an undeclared prefix. 343 * @see #declarePrefix 344 * @see java.lang.String#intern */ processName(String qName, String parts[], boolean isAttribute)345 public String [] processName (String qName, String parts[], 346 boolean isAttribute) 347 { 348 String myParts[] = currentContext.processName(qName, isAttribute); 349 if (myParts == null) { 350 return null; 351 } else { 352 parts[0] = myParts[0]; 353 parts[1] = myParts[1]; 354 parts[2] = myParts[2]; 355 return parts; 356 } 357 } 358 359 360 /** 361 * Look up a prefix and get the currently-mapped Namespace URI. 362 * 363 * <p>This method looks up the prefix in the current context. 364 * Use the empty string ("") for the default Namespace.</p> 365 * 366 * @param prefix The prefix to look up. 367 * @return The associated Namespace URI, or null if the prefix 368 * is undeclared in this context. 369 * @see #getPrefix 370 * @see #getPrefixes 371 */ getURI(String prefix)372 public String getURI (String prefix) 373 { 374 return currentContext.getURI(prefix); 375 } 376 377 378 /** 379 * Return an enumeration of all prefixes whose declarations are 380 * active in the current context. 381 * This includes declarations from parent contexts that have 382 * not been overridden. 383 * 384 * <p><strong>Note:</strong> if there is a default prefix, it will not be 385 * returned in this enumeration; check for the default prefix 386 * using the {@link #getURI getURI} with an argument of "".</p> 387 * 388 * @return An enumeration of prefixes (never empty). 389 * @see #getDeclaredPrefixes 390 * @see #getURI 391 */ getPrefixes()392 public Enumeration getPrefixes () 393 { 394 return currentContext.getPrefixes(); 395 } 396 397 398 /** 399 * Return one of the prefixes mapped to a Namespace URI. 400 * 401 * <p>If more than one prefix is currently mapped to the same 402 * URI, this method will make an arbitrary selection; if you 403 * want all of the prefixes, use the {@link #getPrefixes} 404 * method instead.</p> 405 * 406 * <p><strong>Note:</strong> this will never return the empty (default) prefix; 407 * to check for a default prefix, use the {@link #getURI getURI} 408 * method with an argument of "".</p> 409 * 410 * @param uri the namespace URI 411 * @return one of the prefixes currently mapped to the URI supplied, 412 * or null if none is mapped or if the URI is assigned to 413 * the default namespace 414 * @see #getPrefixes(java.lang.String) 415 * @see #getURI 416 */ getPrefix(String uri)417 public String getPrefix (String uri) 418 { 419 return currentContext.getPrefix(uri); 420 } 421 422 423 /** 424 * Return an enumeration of all prefixes for a given URI whose 425 * declarations are active in the current context. 426 * This includes declarations from parent contexts that have 427 * not been overridden. 428 * 429 * <p>This method returns prefixes mapped to a specific Namespace 430 * URI. The xml: prefix will be included. If you want only one 431 * prefix that's mapped to the Namespace URI, and you don't care 432 * which one you get, use the {@link #getPrefix getPrefix} 433 * method instead.</p> 434 * 435 * <p><strong>Note:</strong> the empty (default) prefix is <em>never</em> included 436 * in this enumeration; to check for the presence of a default 437 * Namespace, use the {@link #getURI getURI} method with an 438 * argument of "".</p> 439 * 440 * @param uri The Namespace URI. 441 * @return An enumeration of prefixes (never empty). 442 * @see #getPrefix 443 * @see #getDeclaredPrefixes 444 * @see #getURI 445 */ getPrefixes(String uri)446 public Enumeration getPrefixes(String uri) { 447 ArrayList<String> prefixes = new ArrayList<String>(); 448 Enumeration allPrefixes = getPrefixes(); 449 while (allPrefixes.hasMoreElements()) { 450 String prefix = (String) allPrefixes.nextElement(); 451 if (uri.equals(getURI(prefix))) { 452 prefixes.add(prefix); 453 } 454 } 455 return Collections.enumeration(prefixes); 456 } 457 458 459 /** 460 * Return an enumeration of all prefixes declared in this context. 461 * 462 * <p>The empty (default) prefix will be included in this 463 * enumeration; note that this behaviour differs from that of 464 * {@link #getPrefix} and {@link #getPrefixes}.</p> 465 * 466 * @return An enumeration of all prefixes declared in this 467 * context. 468 * @see #getPrefixes 469 * @see #getURI 470 */ getDeclaredPrefixes()471 public Enumeration getDeclaredPrefixes () 472 { 473 return currentContext.getDeclaredPrefixes(); 474 } 475 476 /** 477 * Controls whether namespace declaration attributes are placed 478 * into the {@link #NSDECL NSDECL} namespace 479 * by {@link #processName processName()}. This may only be 480 * changed before any contexts have been pushed. 481 * 482 * @param value the namespace declaration attribute state. A value of true 483 * enables this feature, a value of false disables it. 484 * 485 * @since SAX 2.1alpha 486 * 487 * @exception IllegalStateException when attempting to set this 488 * after any context has been pushed. 489 */ setNamespaceDeclUris(boolean value)490 public void setNamespaceDeclUris (boolean value) 491 { 492 if (contextPos != 0) 493 throw new IllegalStateException (); 494 if (value == namespaceDeclUris) 495 return; 496 namespaceDeclUris = value; 497 if (value) 498 currentContext.declarePrefix ("xmlns", NSDECL); 499 else { 500 contexts[contextPos] = currentContext = new Context(); 501 currentContext.declarePrefix("xml", XMLNS); 502 } 503 } 504 505 /** 506 * Returns true if namespace declaration attributes are placed into 507 * a namespace. This behavior is not the default. 508 * 509 * @return true if namespace declaration attributes are enabled, false 510 * otherwise. 511 * @since SAX 2.1alpha 512 */ isNamespaceDeclUris()513 public boolean isNamespaceDeclUris () 514 { return namespaceDeclUris; } 515 516 517 518 //////////////////////////////////////////////////////////////////// 519 // Internal state. 520 //////////////////////////////////////////////////////////////////// 521 522 @UnsupportedAppUsage 523 private Context contexts[]; 524 @UnsupportedAppUsage 525 private Context currentContext; 526 @UnsupportedAppUsage 527 private int contextPos; 528 @UnsupportedAppUsage 529 private boolean namespaceDeclUris; 530 531 532 //////////////////////////////////////////////////////////////////// 533 // Internal classes. 534 //////////////////////////////////////////////////////////////////// 535 536 /** 537 * Internal class for a single Namespace context. 538 * 539 * <p>This module caches and reuses Namespace contexts, 540 * so the number allocated 541 * will be equal to the element depth of the document, not to the total 542 * number of elements (i.e. 5-10 rather than tens of thousands). 543 * Also, data structures used to represent contexts are shared when 544 * possible (child contexts without declarations) to further reduce 545 * the amount of memory that's consumed. 546 * </p> 547 */ 548 final class Context { 549 550 /** 551 * Create the root-level Namespace context. 552 */ 553 @UnsupportedAppUsage Context()554 Context () 555 { 556 copyTables(); 557 } 558 559 560 /** 561 * (Re)set the parent of this Namespace context. 562 * The context must either have been freshly constructed, 563 * or must have been cleared. 564 * 565 * @param context The parent Namespace context object. 566 */ setParent(Context parent)567 void setParent (Context parent) 568 { 569 this.parent = parent; 570 declarations = null; 571 prefixTable = parent.prefixTable; 572 uriTable = parent.uriTable; 573 elementNameTable = parent.elementNameTable; 574 attributeNameTable = parent.attributeNameTable; 575 defaultNS = parent.defaultNS; 576 declSeen = false; 577 declsOK = true; 578 } 579 580 /** 581 * Makes associated state become collectible, 582 * invalidating this context. 583 * {@link #setParent} must be called before 584 * this context may be used again. 585 */ clear()586 void clear () 587 { 588 parent = null; 589 prefixTable = null; 590 uriTable = null; 591 elementNameTable = null; 592 attributeNameTable = null; 593 defaultNS = null; 594 } 595 596 597 /** 598 * Declare a Namespace prefix for this context. 599 * 600 * @param prefix The prefix to declare. 601 * @param uri The associated Namespace URI. 602 * @see org.xml.sax.helpers.NamespaceSupport#declarePrefix 603 */ declarePrefix(String prefix, String uri)604 void declarePrefix(String prefix, String uri) { 605 // Lazy processing... 606 if (!declsOK) { 607 throw new IllegalStateException ("can't declare any more prefixes in this context"); 608 } 609 if (!declSeen) { 610 copyTables(); 611 } 612 if (declarations == null) { 613 declarations = new ArrayList<String>(); 614 } 615 616 prefix = prefix.intern(); 617 uri = uri.intern(); 618 if ("".equals(prefix)) { 619 if ("".equals(uri)) { 620 defaultNS = null; 621 } else { 622 defaultNS = uri; 623 } 624 } else { 625 prefixTable.put(prefix, uri); 626 uriTable.put(uri, prefix); // may wipe out another prefix 627 } 628 declarations.add(prefix); 629 } 630 631 632 /** 633 * Process an XML qualified name in this context. 634 * 635 * @param qName The XML qualified name. 636 * @param isAttribute true if this is an attribute name. 637 * @return An array of three strings containing the 638 * URI part (or empty string), the local part, 639 * and the raw name, all internalized, or null 640 * if there is an undeclared prefix. 641 * @see org.xml.sax.helpers.NamespaceSupport#processName 642 */ processName(String qName, boolean isAttribute)643 String [] processName (String qName, boolean isAttribute) 644 { 645 String name[]; 646 Hashtable table; 647 648 // detect errors in call sequence 649 declsOK = false; 650 651 // Select the appropriate table. 652 if (isAttribute) { 653 table = attributeNameTable; 654 } else { 655 table = elementNameTable; 656 } 657 658 // Start by looking in the cache, and 659 // return immediately if the name 660 // is already known in this content 661 name = (String[])table.get(qName); 662 if (name != null) { 663 return name; 664 } 665 666 // We haven't seen this name in this 667 // context before. Maybe in the parent 668 // context, but we can't assume prefix 669 // bindings are the same. 670 name = new String[3]; 671 name[2] = qName.intern(); 672 int index = qName.indexOf(':'); 673 674 675 // No prefix. 676 if (index == -1) { 677 if (isAttribute) { 678 if (qName == "xmlns" && namespaceDeclUris) 679 name[0] = NSDECL; 680 else 681 name[0] = ""; 682 } else if (defaultNS == null) { 683 name[0] = ""; 684 } else { 685 name[0] = defaultNS; 686 } 687 name[1] = name[2]; 688 } 689 690 // Prefix 691 else { 692 String prefix = qName.substring(0, index); 693 String local = qName.substring(index+1); 694 String uri; 695 if ("".equals(prefix)) { 696 uri = defaultNS; 697 } else { 698 uri = (String)prefixTable.get(prefix); 699 } 700 if (uri == null 701 || (!isAttribute && "xmlns".equals (prefix))) { 702 return null; 703 } 704 name[0] = uri; 705 name[1] = local.intern(); 706 } 707 708 // Save in the cache for future use. 709 // (Could be shared with parent context...) 710 table.put(name[2], name); 711 return name; 712 } 713 714 715 /** 716 * Look up the URI associated with a prefix in this context. 717 * 718 * @param prefix The prefix to look up. 719 * @return The associated Namespace URI, or null if none is 720 * declared. 721 * @see org.xml.sax.helpers.NamespaceSupport#getURI 722 */ getURI(String prefix)723 String getURI (String prefix) 724 { 725 if ("".equals(prefix)) { 726 return defaultNS; 727 } else if (prefixTable == null) { 728 return null; 729 } else { 730 return (String)prefixTable.get(prefix); 731 } 732 } 733 734 735 /** 736 * Look up one of the prefixes associated with a URI in this context. 737 * 738 * <p>Since many prefixes may be mapped to the same URI, 739 * the return value may be unreliable.</p> 740 * 741 * @param uri The URI to look up. 742 * @return The associated prefix, or null if none is declared. 743 * @see org.xml.sax.helpers.NamespaceSupport#getPrefix 744 */ getPrefix(String uri)745 String getPrefix (String uri) 746 { 747 if (uriTable == null) { 748 return null; 749 } else { 750 return (String)uriTable.get(uri); 751 } 752 } 753 754 755 /** 756 * Return an enumeration of prefixes declared in this context. 757 * 758 * @return An enumeration of prefixes (possibly empty). 759 * @see org.xml.sax.helpers.NamespaceSupport#getDeclaredPrefixes 760 */ getDeclaredPrefixes()761 Enumeration getDeclaredPrefixes() { 762 return (declarations == null) ? EMPTY_ENUMERATION : Collections.enumeration(declarations); 763 } 764 765 766 /** 767 * Return an enumeration of all prefixes currently in force. 768 * 769 * <p>The default prefix, if in force, is <em>not</em> 770 * returned, and will have to be checked for separately.</p> 771 * 772 * @return An enumeration of prefixes (never empty). 773 * @see org.xml.sax.helpers.NamespaceSupport#getPrefixes 774 */ getPrefixes()775 Enumeration getPrefixes () 776 { 777 if (prefixTable == null) { 778 return EMPTY_ENUMERATION; 779 } else { 780 return prefixTable.keys(); 781 } 782 } 783 784 785 786 //////////////////////////////////////////////////////////////// 787 // Internal methods. 788 //////////////////////////////////////////////////////////////// 789 790 791 /** 792 * Copy on write for the internal tables in this context. 793 * 794 * <p>This class is optimized for the normal case where most 795 * elements do not contain Namespace declarations.</p> 796 */ copyTables()797 private void copyTables () 798 { 799 if (prefixTable != null) { 800 prefixTable = (Hashtable)prefixTable.clone(); 801 } else { 802 prefixTable = new Hashtable(); 803 } 804 if (uriTable != null) { 805 uriTable = (Hashtable)uriTable.clone(); 806 } else { 807 uriTable = new Hashtable(); 808 } 809 elementNameTable = new Hashtable(); 810 attributeNameTable = new Hashtable(); 811 declSeen = true; 812 } 813 814 815 816 //////////////////////////////////////////////////////////////// 817 // Protected state. 818 //////////////////////////////////////////////////////////////// 819 820 Hashtable prefixTable; 821 Hashtable uriTable; 822 Hashtable elementNameTable; 823 Hashtable attributeNameTable; 824 String defaultNS = null; 825 boolean declsOK = true; 826 827 828 829 //////////////////////////////////////////////////////////////// 830 // Internal state. 831 //////////////////////////////////////////////////////////////// 832 833 private ArrayList<String> declarations = null; 834 private boolean declSeen = false; 835 private Context parent = null; 836 } 837 } 838 839 // end of NamespaceSupport.java 840