nodeimpl.java

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        // Find the ancestor of each node, and the distance each node is from 
        // its ancestor.
        // During this traversal, look for ancestor/descendent relationships 
        // between the 2 nodes in question. 
        // We do this now, so that we get this info correct for attribute nodes 
        // and their children. 

        Node node; 
        Node thisAncestor = this;
        Node otherAncestor = other;
       
        int thisDepth=0;
        int otherDepth=0;
        for (node=this; node != null; node = node.getParentNode()) {
            thisDepth +=1;
            if (node == other) 
              // The other node is an ancestor of this one.
              return (DOCUMENT_POSITION_CONTAINS | 
                      DOCUMENT_POSITION_PRECEDING);
            thisAncestor = node;
        }

        for (node=other; node!=null; node=node.getParentNode()) {
            otherDepth +=1;
            if (node == this) 
              // The other node is a descendent of the reference node.
              return (DOCUMENT_POSITION_IS_CONTAINED | 
                      DOCUMENT_POSITION_FOLLOWING);
            otherAncestor = node;
        }
        
       

        int thisAncestorType = thisAncestor.getNodeType();
        int otherAncestorType = otherAncestor.getNodeType();
        Node thisNode = this;
        Node otherNode = other;

        // Special casing for ENTITY, NOTATION, DOCTYPE and ATTRIBUTES
        // LM:  should rewrite this.                                          
        switch (thisAncestorType) {
          case Node.NOTATION_NODE:
          case Node.ENTITY_NODE: {
            DocumentType container = thisOwnerDoc.getDoctype();
            if (container == otherAncestor) return 
                   (DOCUMENT_POSITION_CONTAINS | DOCUMENT_POSITION_PRECEDING);
            switch (otherAncestorType) {
              case Node.NOTATION_NODE: 
              case Node.ENTITY_NODE:  {
                if (thisAncestorType != otherAncestorType) 
                 // the nodes are of different types
                 return ((thisAncestorType>otherAncestorType) ? 
                    DOCUMENT_POSITION_PRECEDING:DOCUMENT_POSITION_FOLLOWING);
                else {
                 // the nodes are of the same type.  Find order.
                 if (thisAncestorType == Node.NOTATION_NODE)
                 
                     if (((NamedNodeMapImpl)container.getNotations()).precedes(otherAncestor,thisAncestor))
                       return (DOCUMENT_POSITION_PRECEDING | 
                               DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC);
                     else
                       return (DOCUMENT_POSITION_FOLLOWING | 
                               DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC);
                 else
                     if (((NamedNodeMapImpl)container.getEntities()).precedes(otherAncestor,thisAncestor))
                       return (DOCUMENT_POSITION_PRECEDING | 
                               DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC);
                     else
                       return (DOCUMENT_POSITION_FOLLOWING | 
                               DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC);
                }
              }
            }
            thisNode = thisAncestor = thisOwnerDoc;
            break;
          } 
          case Node.DOCUMENT_TYPE_NODE: {
            if (otherNode == thisOwnerDoc) 
              return (DOCUMENT_POSITION_PRECEDING | 
                      DOCUMENT_POSITION_CONTAINS);
            else if (thisOwnerDoc!=null && thisOwnerDoc==otherOwnerDoc)
              return (DOCUMENT_POSITION_FOLLOWING);
            break;
          }
          case Node.ATTRIBUTE_NODE: {
            thisNode = ((AttrImpl)thisAncestor).getOwnerElement();
            if (otherAncestorType==Node.ATTRIBUTE_NODE) {
              otherNode = ((AttrImpl)otherAncestor).getOwnerElement();
              if (otherNode == thisNode) {
                if (((NamedNodeMapImpl)thisNode.getAttributes()).precedes(other,this))
                  return (DOCUMENT_POSITION_PRECEDING | 
                          DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC);
                else
                  return (DOCUMENT_POSITION_FOLLOWING | 
                          DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC);
              }
            }

            // Now, find the ancestor of the element
            thisDepth=0;
            for (node=thisNode; node != null; node=node.getParentNode()) {
                thisDepth +=1;
                if (node == otherNode) 
                  {
                  // The other node is an ancestor of the owning element
                  return (DOCUMENT_POSITION_CONTAINS | 
                          DOCUMENT_POSITION_PRECEDING);
                  }
                thisAncestor = node;
            }
          }
        }
        switch (otherAncestorType) {
          case Node.NOTATION_NODE:
          case Node.ENTITY_NODE: {
          DocumentType container = thisOwnerDoc.getDoctype();
            if (container == this) return (DOCUMENT_POSITION_IS_CONTAINED | 
                                          DOCUMENT_POSITION_FOLLOWING);
            otherNode = otherAncestor = thisOwnerDoc;
            break;
          }
          case Node.DOCUMENT_TYPE_NODE: {
            if (thisNode == otherOwnerDoc) 
              return (DOCUMENT_POSITION_FOLLOWING | 
                      DOCUMENT_POSITION_IS_CONTAINED);
            else if (otherOwnerDoc!=null && thisOwnerDoc==otherOwnerDoc)
              return (DOCUMENT_POSITION_PRECEDING);
            break;
          }
          case Node.ATTRIBUTE_NODE: {
            otherDepth=0;
            otherNode = ((AttrImpl)otherAncestor).getOwnerElement();
            for (node=otherNode; node != null; node=node.getParentNode()) {
                otherDepth +=1;
                if (node == thisNode) 
                  // The other node is a descendent of the reference 
                  // node's element
                  return DOCUMENT_POSITION_FOLLOWING | 
                         DOCUMENT_POSITION_IS_CONTAINED;
                otherAncestor = node;
            }

          }
        }
 
        // thisAncestor and otherAncestor must be the same at this point,  
        // otherwise, the original nodes are disconnected 
        if (thisAncestor != otherAncestor) {
          int thisAncestorNum, otherAncestorNum;
          thisAncestorNum = ((NodeImpl)thisAncestor).getNodeNumber();
          otherAncestorNum = ((NodeImpl)otherAncestor).getNodeNumber();
          
          if (thisAncestorNum > otherAncestorNum) 
            return DOCUMENT_POSITION_DISCONNECTED | 
                   DOCUMENT_POSITION_FOLLOWING | 
                   DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC;
          else
            return DOCUMENT_POSITION_DISCONNECTED | 
                   DOCUMENT_POSITION_PRECEDING | 
                   DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC;
        }

      
        // Go up the parent chain of the deeper node, until we find a node 
        // with the same depth as the shallower node

        if (thisDepth > otherDepth) {
          for (int i=0; i<thisDepth - otherDepth; i++)
            thisNode = thisNode.getParentNode();
          // Check if the node we have reached is in fact "otherNode". This can
          // happen in the case of attributes.  In this case, otherNode 
          // "precedes" this.
          if (thisNode == otherNode) 
{
            return DOCUMENT_POSITION_PRECEDING;
          }
        }
 
        else {
          for (int i=0; i<otherDepth - thisDepth; i++)
            otherNode = otherNode.getParentNode();
          // Check if the node we have reached is in fact "thisNode".  This can
          // happen in the case of attributes.  In this case, otherNode 
          // "follows" this.
          if (otherNode == thisNode) 
            return DOCUMENT_POSITION_FOLLOWING;
        }
             
        // We now have nodes at the same depth in the tree.  Find a common 
        // ancestor.                                   
        Node thisNodeP, otherNodeP;
        for (thisNodeP=thisNode.getParentNode(),
                  otherNodeP=otherNode.getParentNode();
             thisNodeP!=otherNodeP;) {
             thisNode = thisNodeP;
             otherNode = otherNodeP;
             thisNodeP = thisNodeP.getParentNode();
             otherNodeP = otherNodeP.getParentNode();
        }

        // At this point, thisNode and otherNode are direct children of 
        // the common ancestor.  
        // See whether thisNode or otherNode is the leftmost

        for (Node current=thisNodeP.getFirstChild(); 
                  current!=null;
                  current=current.getNextSibling()) {
               if (current==otherNode) {
                 return DOCUMENT_POSITION_PRECEDING;
               }
               else if (current==thisNode) {
                 return DOCUMENT_POSITION_FOLLOWING;
               }
        }
        // REVISIT:  shouldn't get here.   Should probably throw an 
        // exception
        return 0;

    }

    /**
     * This attribute returns the text content of this node and its 
     * descendants. When it is defined to be null, setting it has no effect. 
     * When set, any possible children this node may have are removed and 
     * replaced by a single <code>Text</code> node containing the string 
     * this attribute is set to. On getting, no serialization is performed, 
     * the returned string does not contain any markup. No whitespace 
     * normalization is performed, the returned string does not contain the 
     * element content whitespaces . Similarly, on setting, no parsing is 
     * performed either, the input string is taken as pure textual content.
     * <br>The string returned is made of the text content of this node 
     * depending on its type, as defined below: 
     * <table border='1'>
     * <tr>
     * <th>Node type</th>
     * <th>Content</th>
     * </tr>

    /**
     * This attribute returns the text content of this node and its 
     * descendants. When it is defined to be null, setting it has no effect. 
     * When set, any possible children this node may have are removed and 
     * replaced by a single <code>Text</code> node containing the string 
     * this attribute is set to. On getting, no serialization is performed, 
     * the returned string does not contain any markup. No whitespace 
     * normalization is performed, the returned string does not contain the 
     * element content whitespaces . Similarly, on setting, no parsing is 
     * performed either, the input string is taken as pure textual content.
     * <br>The string returned is made of the text content of this node 
     * depending on its type, as defined below: 
     * <table border='1'>
     * <tr>
     * <th>Node type</th>
     * <th>Content</th>
     * </tr>
     * <tr>
     * <td valign='top' rowspan='1' colspan='1'>
     * ELEMENT_NODE, ENTITY_NODE, ENTITY_REFERENCE_NODE, 
     * DOCUMENT_FRAGMENT_NODE</td>
     * <td valign='top' rowspan='1' colspan='1'>concatenation of the <code>textContent</code> 
     * attribute value of every child node, excluding COMMENT_NODE and 
     * PROCESSING_INSTRUCTION_NODE nodes</td>
     * </tr>
     * <tr>
     * <td valign='top' rowspan='1' colspan='1'>ATTRIBUTE_NODE, TEXT_NODE, 
     * CDATA_SECTION_NODE, COMMENT_NODE, PROCESSING_INSTRUCTION_NODE</td>
     * <td valign='top' rowspan='1' colspan='1'>
     * <code>nodeValue</code></td>
     * </tr>
     * <tr>
     * <td valign='top' rowspan='1' colspan='1'>DOCUMENT_NODE, DOCUMENT_TYPE_NODE, NOTATION_NODE</td>
     * <td valign='top' rowspan='1' colspan='1'>
     * null</td>
     * </tr>
     * </table>
     * @exception DOMException
     *   NO_MODIFICATION_ALLOWED_ERR: Raised when the node is readonly.
     * @exception DOMException
     *   DOMSTRING_SIZE_ERR: Raised when it would return more characters than 
     *   fit in a <code>DOMString</code> variable on the implementation 
     *   platform.
     * @since DOM Level 3
     */
    public String getTextContent() throws DOMException {
        return getNodeValue();  // overriden in some subclasses
    }

    // internal method taking a StringBuffer in parameter
    void getTextContent(StringBuffer buf) throws DOMException {
        String content = getNodeValue();
        if (content != null) {
            buf.append(content);
        }
    }

    /**
     * This attribute returns the text content of this node and its 
     * descendants. When it is defined to be null, setting it has no effect. 
     * When set, any possible children this node may have are removed and 
     * replaced by a single <code>Text</code> node containing the string 
     * this attribute is set to. On getting, no serialization is performed, 
     * the returned string does not contain any markup. No whitespace 
     * normalization is performed, the returned string does not contain the 
     * element content whitespaces . Similarly, on setting, no parsing is 
     * performed either, the input string is taken as pure textual content.
     * <br>The string returned is made of the text content of this node 
     * depending on its type, as defined below: 
     * <table border='1'>
     * <tr>
     * <th>Node type</th>
     * <th>Content</th>
     * </tr>
     * <tr>
     * <td valign='top' rowspan='1' colspan='1'>
     * ELEMENT_NODE, ENTITY_NODE, ENTITY_REFERENCE_NODE, 
     * DOCUMENT_FRAGMENT_NODE</td>
     * <td valign='top' rowspan='1' colspan='1'>concatenation of the <code>textContent</code> 
     * attribute value of every child node, excluding COMMENT_NODE and 
     * PROCESSING_INSTRUCTION_NODE nodes</td>
     * </tr>
     * <tr>
     * <td valign='top' rowspan='1' colspan='1'>ATTRIBUTE_NODE, TEXT_NODE, 
     * CDATA_SECTION_NODE, COMMENT_NODE, PROCESSING_INSTRUCTION_NODE</td>
     * <td valign='top' rowspan='1' colspan='1'>
     * <code>nodeValue</code></td>
     * </tr>
     * <tr>
     * <td valign='top' rowspan='1' colspan='1'>DOCUMENT_NODE, DOCUMENT_TYPE_NODE, NOTATION_NODE</td>
     * <td valign='top' rowspan='1' colspan='1'>
     * null</td>
     * </tr>
     * </table>
     * @exception DOMException
     *   NO_MODIFICATION_ALLOWED_ERR: Raised when the node is readonly.
     * @exception DOMException
     *   DOMSTRING_SIZE_ERR: Raised when it would return more characters than 
     *   fit in a <code>DOMString</code> variable on the implementation 
     *   platform.