elemtemplateelement.java

来自「java jdk 1.4的源码」· Java 代码 · 共 1,705 行 · 第 1/4 页

   * Return the nodelist (same reference).
   *
   * @return The nodelist containing the child nodes (this)
   */
  public NodeList getChildNodes()
  {
    return this;
  }

  /**
   * Remove a child.
   * ADDED 9/8/200 to support compilation.
   * TODO: ***** Alternative is "removeMe() from my parent if any"
   * ... which is less well checked, but more convenient in some cases.
   * Given that we assume only experts are calling this class, it might
   * be preferable. It's less DOMish, though.
   * 
   * @param childETE The child to remove. This operation is a no-op
   * if oldChild is not a child of this node.
   *
   * @return the removed child, or null if the specified
   * node was not a child of this element.
   */
  public ElemTemplateElement removeChild(ElemTemplateElement childETE)
  {

    if (childETE == null || childETE.m_parentNode != this)
      return null;

    // Pointers to the child
    if (childETE == m_firstChild)
      m_firstChild = childETE.m_nextSibling;
    else
    {
      ElemTemplateElement prev = childETE.getPreviousSiblingElem();

      prev.m_nextSibling = childETE.m_nextSibling;
    }

    // Pointers from the child
    childETE.m_parentNode = null;
    childETE.m_nextSibling = null;

    return childETE;
  }

  /**
   * Replace the old child with a new child.
   *
   * @param newChild New child to replace with
   * @param oldChild Old child to be replaced
   *
   * @return The new child
   *
   * @throws DOMException
   */
  public Node replaceChild(Node newChild, Node oldChild) throws DOMException
  {

    if (oldChild == null || oldChild.getParentNode() != this)
      return null;

    ElemTemplateElement newChildElem = ((ElemTemplateElement) newChild);
    ElemTemplateElement oldChildElem = ((ElemTemplateElement) oldChild);

    // Fix up previous sibling.
    ElemTemplateElement prev =
      (ElemTemplateElement) oldChildElem.getPreviousSibling();

    if (null != prev)
      prev.m_nextSibling = newChildElem;

    // Fix up parent (this)
    if (m_firstChild == oldChildElem)
      m_firstChild = newChildElem;

    newChildElem.m_parentNode = this;
    oldChildElem.m_parentNode = null;
    newChildElem.m_nextSibling = oldChildElem.m_nextSibling;
    oldChildElem.m_nextSibling = null;

    // newChildElem.m_stylesheet = oldChildElem.m_stylesheet;
    // oldChildElem.m_stylesheet = null;
    return newChildElem;
  }
  
  /**
   * Unimplemented. See org.w3c.dom.Node
   *
   * @param newChild New child node to insert
   * @param refChild Insert in front of this child
   *
   * @return null
   *
   * @throws DOMException
   */
  public Node insertBefore(Node newChild, Node refChild) throws DOMException
  {
  	if(null == refChild)
  	{
  		appendChild(newChild);
  		return newChild;
  	}
  	
  	if(newChild == refChild)
  	{
  		// hmm...
  		return newChild;
  	}

    Node node = m_firstChild; 
    Node prev = null;  
    boolean foundit = false;
    
    while (null != node)
    {
    	// If the newChild is already in the tree, it is first removed.
    	if(newChild == node)
    	{
    		if(null != prev)
    			((ElemTemplateElement)prev).m_nextSibling = 
    				(ElemTemplateElement)node.getNextSibling();
    		else
    			m_firstChild = (ElemTemplateElement)node.getNextSibling();
    		node = node.getNextSibling();
    		continue; // prev remains the same.
    	}
    	if(refChild == node)
    	{
    		if(null != prev)
    		{
    			((ElemTemplateElement)prev).m_nextSibling = (ElemTemplateElement)newChild;
    		}
    		else
    		{
    			m_firstChild = (ElemTemplateElement)newChild;
    		}
    		((ElemTemplateElement)newChild).m_nextSibling = (ElemTemplateElement)refChild;
    		((ElemTemplateElement)newChild).setParentElem(this);
    		prev = newChild;
    		node = node.getNextSibling();
    		foundit = true;
    		continue;
    	}
    	prev = node;
    	node = node.getNextSibling();
    }
    
    if(!foundit)
    	throw new DOMException(DOMException.NOT_FOUND_ERR, 
    		"refChild was not found in insertBefore method!");
    else
    	return newChild;
  }


  /**
   * Replace the old child with a new child.
   *
   * @param newChild New child to replace with
   * @param oldChild Old child to be replaced
   *
   * @return The new child
   *
   * @throws DOMException
   */
  public ElemTemplateElement replaceChild(ElemTemplateElement newChildElem, 
                                          ElemTemplateElement oldChildElem)
  {

    if (oldChildElem == null || oldChildElem.getParentElem() != this)
      return null;

    // Fix up previous sibling.
    ElemTemplateElement prev =
      oldChildElem.getPreviousSiblingElem();

    if (null != prev)
      prev.m_nextSibling = newChildElem;

    // Fix up parent (this)
    if (m_firstChild == oldChildElem)
      m_firstChild = newChildElem;

    newChildElem.m_parentNode = this;
    oldChildElem.m_parentNode = null;
    newChildElem.m_nextSibling = oldChildElem.m_nextSibling;
    oldChildElem.m_nextSibling = null;

    // newChildElem.m_stylesheet = oldChildElem.m_stylesheet;
    // oldChildElem.m_stylesheet = null;
    return newChildElem;
  }

  /**
   * NodeList method: Count the immediate children of this node
   *
   * @return The count of children of this node
   */
  public int getLength()
  {

    // It is assumed that the getChildNodes call synchronized
    // the children. Therefore, we can access the first child
    // reference directly.
    int count = 0;

    for (ElemTemplateElement node = m_firstChild; node != null;
            node = node.m_nextSibling)
    {
      count++;
    }

    return count;
  }  // getLength():int

  /**
   * NodeList method: Return the Nth immediate child of this node, or
   * null if the index is out of bounds.
   *
   * @param index Index of child to find
   * @return org.w3c.dom.Node: the child node at given index
   */
  public Node item(int index)
  {

    // It is assumed that the getChildNodes call synchronized
    // the children. Therefore, we can access the first child
    // reference directly.
    ElemTemplateElement node = m_firstChild;

    for (int i = 0; i < index && node != null; i++)
    {
      node = node.m_nextSibling;
    }

    return node;
  }  // item(int):Node

  /**
   * Get the stylesheet owner.
   *
   * @return The stylesheet owner
   */
  public Document getOwnerDocument()
  {
    return getStylesheet();
  }
  
  /**
   * Get the owning xsl:template element.
   *
   * @return The owning xsl:template element, this element if it is a xsl:template, or null if not found.
   */
  public ElemTemplate getOwnerXSLTemplate()
  {
  	ElemTemplateElement el = this;
  	int type = el.getXSLToken();
  	while((null != el) && (type != Constants.ELEMNAME_TEMPLATE))
  	{
    	el = el.getParentElem();
    	if(null != el)
  			type = el.getXSLToken();
  	}
  	return (ElemTemplate)el;
  }


  /**
   * Return the element name.
   *
   * @return The element name
   */
  public String getTagName()
  {
    return getNodeName();
  }
  
  /**
   * Tell if this element only has one text child, for optimization purposes.
   * @return true of this element only has one text literal child.
   */
  public boolean hasTextLitOnly()
  {
    return m_hasTextLitOnly;
  }

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

    // Should this always be absolute?
    return this.getSystemId();
  }

  /** line number where the current document event ends.
   *  @serial         */
  private int m_lineNumber;

  /**
   * Return the line number where the current document event ends.
   * Note that this is the line position of the first character
   * after the text associated with the document event.
   * @return The line number, or -1 if none is available.
   * @see #getColumnNumber
   */
  public int getLineNumber()
  {
    return m_lineNumber;
  }

  /** the column number where the current document event ends.
   *  @serial        */
  private int m_columnNumber;

  /**
   * Return the column number where the current document event ends.
   * Note that this is the column number of the first
   * character after the text associated with the document
   * event.  The first column in a line is position 1.
   * @return The column number, or -1 if none is available.
   * @see #getLineNumber
   */
  public int getColumnNumber()
  {
    return m_columnNumber;
  }

  /**
   * Return the public identifier for the current document event.
   * <p>This will be the public identifier
   * @return A string containing the public identifier, or
   *         null if none is available.
   * @see #getSystemId
   */
  public String getPublicId()
  {
    return (null != m_parentNode) ? m_parentNode.getPublicId() : null;
  }

  /**
   * Return the system identifier for the current document event.
   *
   * <p>If the system identifier is a URL, the parser must resolve it
   * fully before passing it to the application.</p>
   *
   * @return A string containing the system identifier, or null
   *         if none is available.
   * @see #getPublicId
   */
  public String getSystemId()
  {
    Stylesheet sheet=getStylesheet();
    return (sheet==null) ? null : sheet.getHref();
  }

  /**
   * Set the location information for this element.
   *
   * @param locator Source Locator with location information for this element
   */
  public void setLocaterInfo(SourceLocator locator)
  {
    m_lineNumber = locator.getLineNumber();
    m_columnNumber = locator.getColumnNumber();
  }

  /**
   * Tell if this element has the default space handling
   * turned off or on according to the xml:space attribute.
   * @serial
   */
  private boolean m_defaultSpace = true;

  /**
   * Tell if this element only has one text child, for optimization purposes.
   * @serial
   */
  private boolean m_hasTextLitOnly = false;

  /**
   * Tell if this element only has one text child, for optimization purposes.
   * @serial
   */
  protected boolean m_hasVariableDecl = false;
  
  public boolean hasVariableDecl()
  {
    return m_hasVariableDecl;
  }

  /**
   * Set the "xml:space" attribute.
   * A text node is preserved if an ancestor element of the text node
   * has an xml:space attribute with a value of preserve, and
   * no closer ancestor element has xml:space with a value of default.
   * @see <a href="http://www.w3.org/TR/xslt#strip">strip in XSLT Specification</a>
   * @see <a href="http://www.w3.org/TR/xslt#section-Creating-Text">section-Creating-Text in XSLT Specification</a>
   *
   * @param v  Enumerated value, either Constants.ATTRVAL_PRESERVE 
   * or Constants.ATTRVAL_STRIP.
   */
  public void setXmlSpace(int v)
  {
    m_defaultSpace = ((Constants.ATTRVAL_STRIP == v) ? true : false);
  }

  /**
   * Get the "xml:space" attribute.
   * A text node is preserved if an ancestor element of the text node
   * has an xml:space attribute with a value of preserve, and
   * no closer ancestor element has xml:space with a value of default.
   * @see <a href="http://www.w3.org/TR/xslt#strip">strip in XSLT Specification</a>
   * @see <a href="http://www.w3.org/TR/xslt#section-Creating-Text">section-Creating-Text in XSLT Specification</a>
   *
   * @return The value of the xml:space attribute
   */
  public boolean getXmlSpace()
  {
    return m_defaultSpace;
  }

  /**