stylesheethandler.java

来自「java jdk 1.4的源码」· Java 代码 · 共 1,722 行 · 第 1/4 页

   * @return Valid XSLTElementProcessor, which should never be null.
   */
  XSLTElementProcessor getCurrentProcessor()
  {
    return (XSLTElementProcessor) m_processors.peek();
  }

  /**
   * Push the current XSLTElementProcessor onto the top of the stack.
   *
   * @param processor non-null reference to the current element processor.
   */
  void pushProcessor(XSLTElementProcessor processor)
  {
    m_processors.push(processor);
  }

  /**
   * Pop the current XSLTElementProcessor from the top of the stack.
   * @return the XSLTElementProcessor which was popped.
   */
  XSLTElementProcessor popProcessor()
  {
    return (XSLTElementProcessor) m_processors.pop();
  }

  /**
   * The root of the XSLT Schema, which tells us how to
   * transition content handlers, create elements, etc.
   * For the moment at least, this can't be static, since
   * the processors store state.
   */
  private XSLTSchema m_schema = new XSLTSchema();

  /**
   * Get the root of the XSLT Schema, which tells us how to
   * transition content handlers, create elements, etc.
   *
   * @return The root XSLT Schema, which should never be null.
   */
  XSLTSchema getSchema()
  {
    return m_schema;
  }

  /**
   * The stack of elements, pushed and popped as events occur.
   */
  private Stack m_elems = new Stack();

  /**
   * Get the current ElemTemplateElement at the top of the stack.
   * @return Valid ElemTemplateElement, which may be null.
   */
  ElemTemplateElement getElemTemplateElement()
  {

    try
    {
      return (ElemTemplateElement) m_elems.peek();
    }
    catch (java.util.EmptyStackException ese)
    {
      return null;
    }
  }  

  /** An increasing number that is used to indicate the order in which this element
   *  was encountered during the parse of the XSLT tree.
   */
  private int m_docOrderCount = 0;

  /**
   * Returns the next m_docOrderCount number and increments the number for future use.
   */
  int nextUid()
  {
    return m_docOrderCount++;
  }

  /**
   * Push the current XSLTElementProcessor to the top of the stack.  As a
   * side-effect, set the document order index (simply because this is a
   * convenient place to set it).
   *
   * @param elem Should be a non-null reference to the intended current
   * template element.
   */
  void pushElemTemplateElement(ElemTemplateElement elem)
  {

    if (elem.getUid() == -1)
      elem.setUid(nextUid());

    m_elems.push(elem);
  }

  /**
   * Get the current XSLTElementProcessor from the top of the stack.
   * @return the ElemTemplateElement which was popped.
   */
  ElemTemplateElement popElemTemplateElement()
  {
    return (ElemTemplateElement) m_elems.pop();
  }

  
  /**
   * A XSLMessages instance capable of producing user messages.
   */
  private static XSLMessages m_XSLMessages = new XSLMessages();

  /**
   * Get an XSLMessages instance capable of producing user messages.
   *
   * @return non-null reference to the error and warnings table.
   */
  XSLMessages getXSLMessages()
  {
    return m_XSLMessages;
  }

  /**
   * This will act as a stack to keep track of the
   * current include base.
   */
  Stack m_baseIdentifiers = new Stack();

  /**
   * Push a base identifier onto the base URI stack.
   *
   * @param baseID The current base identifier for this position in the
   * stylesheet, which may be a fragment identifier, or which may be null.
   * @see <a href="http://www.w3.org/TR/xslt#base-uri">
   * Section 3.2 Base URI of XSLT specification.</a>
   */
  void pushBaseIndentifier(String baseID)
  {

    if (null != baseID)
    {
      int posOfHash = baseID.indexOf('#');

      if (posOfHash > -1)
      {
        m_fragmentIDString = baseID.substring(posOfHash + 1);
        m_shouldProcess = false;
      }
      else
        m_shouldProcess = true;
    }
    else
      m_shouldProcess = true;

    m_baseIdentifiers.push(baseID);
  }

  /**
   * Pop a base URI from the stack.
   * @return baseIdentifier.
   */
  String popBaseIndentifier()
  {
    return (String) m_baseIdentifiers.pop();
  }

  /**
   * Return the base identifier.
   *
   * @return The base identifier of the current stylesheet.
   */
  public String getBaseIdentifier()
  {

    // Try to get the baseIdentifier from the baseIdentifier's stack,
    // which may not be the same thing as the value found in the
    // SourceLocators stack.
    String base = (String) (m_baseIdentifiers.isEmpty()
                            ? null : m_baseIdentifiers.peek());

    // Otherwise try the stylesheet.
    if (null == base)
    {
      SourceLocator locator = getLocator();

      base = (null == locator) ? "" : locator.getSystemId();
    }

    return base;
  }

  /**
   * The top of this stack should contain the currently processed
   * stylesheet SAX locator object.
   */
  private Stack m_stylesheetLocatorStack = new Stack();

  /**
   * Get the current stylesheet Locator object.
   *
   * @return non-null reference to the current locator object.
   */
  public SAXSourceLocator getLocator()
  {

    if (m_stylesheetLocatorStack.isEmpty())
    {
      SAXSourceLocator locator = new SAXSourceLocator();

      locator.setSystemId(this.getStylesheetProcessor().getDOMsystemID());

      return locator;

      // m_stylesheetLocatorStack.push(locator);
    }

    return ((SAXSourceLocator) m_stylesheetLocatorStack.peek());
  }

  /**
   * A stack of URL hrefs for imported stylesheets.  This is
   * used to diagnose circular imports.
   */
  private Stack m_importStack = new Stack();

  /**
   * Push an import href onto the stylesheet stack.
   *
   * @param hrefUrl non-null reference to the URL for the current imported
   * stylesheet.
   */
  void pushImportURL(String hrefUrl)
  {
    m_importStack.push(hrefUrl);
  }

  /**
   * See if the imported stylesheet stack already contains
   * the given URL.  Used to test for recursive imports.
   *
   * @param hrefUrl non-null reference to a URL string.
   *
   * @return true if the URL is on the import stack.
   */
  boolean importStackContains(String hrefUrl)
  {
    return stackContains(m_importStack, hrefUrl);
  }

  /**
   * Pop an import href from the stylesheet stack.
   *
   * @return non-null reference to the import URL that was popped.
   */
  String popImportURL()
  {
    return (String) m_importStack.pop();
  }

  /**
   * If this is set to true, we've already warned about using the
   * older XSLT namespace URL.
   */
  private boolean warnedAboutOldXSLTNamespace = false;

  /** Stack of NamespaceSupport objects. */
  Stack m_nsSupportStack = new Stack();

  /**
   * Push a new NamespaceSupport instance.
   */
  void pushNewNamespaceSupport()
  {
    m_nsSupportStack.push(new NamespaceSupport2());
  }

  /**
   * Pop the current NamespaceSupport object.
   *
   */
  void popNamespaceSupport()
  {
    m_nsSupportStack.pop();
  }

  /**
   * Get the current NamespaceSupport object.
   *
   * @return a non-null reference to the current NamespaceSupport object,
   * which is the top of the namespace support stack.
   */
  NamespaceSupport getNamespaceSupport()
  {
    return (NamespaceSupport) m_nsSupportStack.peek();
  }

  /**
   * The originating node if the current stylesheet is being created
   *  from a DOM.
   *  @see org.apache.xml.utils.NodeConsumer
   */
  private Node m_originatingNode;

  /**
   * Set the node that is originating the SAX event.
   *
   * @param n Reference to node that originated the current event.
   * @see org.apache.xml.utils.NodeConsumer
   */
  public void setOriginatingNode(Node n)
  {
    m_originatingNode = n;
  }

  /**
   * Set the node that is originating the SAX event.
   *
   * @return Reference to node that originated the current event.
   * @see org.apache.xml.utils.NodeConsumer
   */
  public Node getOriginatingNode()
  {
    return m_originatingNode;
  }
  
  /**
   * Stack of booleans that are pushed and popped in start/endElement depending 
   * on the value of xml:space=default/preserve.
   */
  private BoolStack m_spacePreserveStack = new BoolStack();
  
  /**
   * Return boolean value from the spacePreserve stack depending on the value 
   * of xml:space=default/preserve.
   * 
   * @return true if space should be preserved, false otherwise.
   */
  boolean isSpacePreserve()
  {
    return m_spacePreserveStack.peek();
  }
  
  /**
   * Pop boolean value from the spacePreserve stack.
   */
  void popSpaceHandling()
  {
    m_spacePreserveStack.pop();
  }
  
  /**
   * Push boolean value on to the spacePreserve stack.
   * 
   * @param b true if space should be preserved, false otherwise.
   */
  void pushSpaceHandling(boolean b)
    throws org.xml.sax.SAXParseException
  {
    m_spacePreserveStack.push(b);
  }
  
  /**
   * Push boolean value on to the spacePreserve stack depending on the value 
   * of xml:space=default/preserve.
   * 
   * @param attrs list of attributes that were passed to startElement.
   */
  void pushSpaceHandling(Attributes attrs)
    throws org.xml.sax.SAXParseException
  {    
    String value = attrs.getValue("xml:space");
    if(null == value)
    {
      m_spacePreserveStack.push(m_spacePreserveStack.peekOrFalse());
    }
    else if(value.equals("preserve"))
    {
      m_spacePreserveStack.push(true);
    }
    else if(value.equals("default"))
    {
      m_spacePreserveStack.push(false);
    }
    else
    {
      SAXSourceLocator locator = getLocator();
      ErrorListener handler = m_stylesheetProcessor.getErrorListener();
  
      try
      {
        handler.error(new TransformerException(XSLMessages.createMessage(XSLTErrorResources.ER_ILLEGAL_XMLSPACE_VALUE, null), locator)); //"Illegal value for xml:space", locator));
      }
      catch (TransformerException te)
      {
        throw new org.xml.sax.SAXParseException(te.getMessage(), locator, te);
      }
      m_spacePreserveStack.push(m_spacePreserveStack.peek());
    }
  }
  
  private double getElemVersion()
  {
    ElemTemplateElement elem = getElemTemplateElement();
    double version = -1; 
    while ((version == -1 || version == Constants.XSLTVERSUPPORTED) && elem != null)
    {
      try{
      version = Double.valueOf(elem.getVersion()).doubleValue();
      }
      catch (Exception ex)
      {
        version = -1;
      }
      elem = elem.getParentElem();
      }
    return (version == -1)? Constants.XSLTVERSUPPORTED : version;
  }
	/**
	 * @see PrefixResolver#handlesNullPrefixes()
	 */
	public boolean handlesNullPrefixes() {
		return false;
	}

}