domnodeimpl.cpp

来自「IBM的解析xml的工具Xerces的源代码」· C++ 代码 · 共 1,113 行 · 第 1/3 页

    if (thisAncestorType == DOMNode::ATTRIBUTE_NODE &&
            otherAncestorType == DOMNode::ATTRIBUTE_NODE &&
            thisNode==otherNode)
        return DOMNode::TREE_POSITION_EQUIVALENT;

    // Now, find the ancestor of the owning element, if the original
    // ancestor was an attribute

    if (thisAncestorType == DOMNode::ATTRIBUTE_NODE) {
        thisDepth=0;
        for (node=thisNode; node != 0; node = node->getParentNode()) {
            thisDepth +=1;
            if (node == otherNode)
                // The other node is an ancestor of the owning element
                return DOMNode::TREE_POSITION_PRECEDING;
            thisAncestor = node;
        }
        for (node=otherNode; node != 0; node = node->getParentNode()) {
            if (node == thisNode)
                // The other node is an ancestor of the owning element
                return DOMNode::TREE_POSITION_FOLLOWING;
        }
    }

    // Now, find the ancestor of the owning element, if the original
    // ancestor was an attribute
    if (otherAncestorType == DOMNode::ATTRIBUTE_NODE) {
        otherDepth=0;
        for (node=otherNode; node != 0; node = node->getParentNode()) {
            otherDepth +=1;
            if (node == thisNode)
                // The other node is a descendent of the reference
                // node's element
                return DOMNode::TREE_POSITION_FOLLOWING;
            otherAncestor = node;
        }
        for (node=thisNode; node != 0; node = node->getParentNode()) {
            if (node == otherNode)
                // The other node is an ancestor of the owning element
                return DOMNode::TREE_POSITION_PRECEDING;
        }
    }

    // thisAncestor and otherAncestor must be the same at this point,
    // otherwise, we are not in the same tree or document fragment
    if (thisAncestor != otherAncestor)
        return DOMNode::TREE_POSITION_DISCONNECTED;

    // Determine which node is of the greatest depth.
    if (thisDepth > otherDepth) {
        for (int i= 0 ; i < thisDepth - otherDepth; i++)
            thisNode = thisNode->getParentNode();
    }
    else {
        for (int i = 0; i < otherDepth - thisDepth; i++)
            otherNode = otherNode->getParentNode();
    }

    // We now have nodes at the same depth in the tree.  Find a common
    // ancestor.
    DOMNode *thisNodeP, *otherNodeP;
    for (thisNodeP = thisNode->getParentNode(),
                 otherNodeP = otherNode->getParentNode();
             thisNodeP != otherNodeP;) {
        thisNode = thisNodeP;
        otherNode = otherNodeP;
        thisNodeP = thisNodeP->getParentNode();
        otherNodeP = otherNodeP->getParentNode();
    }

    // See whether thisNode or otherNode is the leftmost
    for (DOMNode *current = thisNodeP->getFirstChild();
             current != 0;
             current = current->getNextSibling()) {
        if (current == otherNode) {
            return DOMNode::TREE_POSITION_PRECEDING;
        }
        else if (current == thisNode) {
            return DOMNode::TREE_POSITION_FOLLOWING;
        }
    }
    // REVISIT:  shouldn't get here.   Should probably throw an
    // exception
    return 0;

}

short DOMNodeImpl::reverseTreeOrderBitPattern(short pattern) const {

    if(pattern & DOMNode::TREE_POSITION_PRECEDING) {
        pattern &= !DOMNode::TREE_POSITION_PRECEDING;
        pattern |= DOMNode::TREE_POSITION_FOLLOWING;
    }
    else if(pattern & DOMNode::TREE_POSITION_FOLLOWING) {
        pattern &= !DOMNode::TREE_POSITION_FOLLOWING;
        pattern |= DOMNode::TREE_POSITION_PRECEDING;
    }

    if(pattern & DOMNode::TREE_POSITION_ANCESTOR) {
        pattern &= !DOMNode::TREE_POSITION_ANCESTOR;
        pattern |= DOMNode::TREE_POSITION_DESCENDANT;
    }
    else if(pattern & DOMNode::TREE_POSITION_DESCENDANT) {
        pattern &= !DOMNode::TREE_POSITION_DESCENDANT;
        pattern |= DOMNode::TREE_POSITION_ANCESTOR;
    }

    return pattern;
}

/***
 *
 *   Excerpt from http://www.w3.org/TR/2003/WD-DOM-Level-3-Core-20030226/core.html#Node3-textContent
 *
 *   textContent of type DOMString, introduced in DOM Level 3 
 *   
 *   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 Text 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 Fundamental Interfaces. 
 *
 *   Similarly, on setting, no parsing is performed either, the input string is taken as pure textual content.
 *
 *   The string returned is made of the text content of this node depending on its type, 
 *   as defined below: 
 *
 *       Node type                                           Content          
 *   ====================       ========================================================================
 *     ELEMENT_NODE               concatenation of the textContent attribute value of every child node, 
 *     ENTITY_NODE			      excluding COMMENT_NODE and PROCESSING_INSTRUCTION_NODE nodes. 
 *     ENTITY_REFERENCE_NODE	  This is the empty string if the node has no children. 
 *     DOCUMENT_FRAGMENT_NODE 
 *    --------------------------------------------------------------------------------------------------
 *     ATTRIBUTE_NODE
 *     TEXT_NODE
 *     CDATA_SECTION_NODE
 *     COMMENT_NODE, 
 *     PROCESSING_INSTRUCTION_NODE   nodeValue 
 *    --------------------------------------------------------------------------------------------------
 *     DOCUMENT_NODE, 
 *     DOCUMENT_TYPE_NODE, 
 *     NOTATION_NODE                 null 
 *
 ***/

const XMLCh*     DOMNodeImpl::getTextContent() const
{
	unsigned int nBufferLength = 0;

	getTextContent(NULL, nBufferLength);
	XMLCh* pzBuffer = (XMLCh*)((DOMDocumentImpl*)getOwnerDocument())->allocate((nBufferLength+1) * sizeof(XMLCh));
	getTextContent(pzBuffer, nBufferLength);
	pzBuffer[nBufferLength] = 0;

	return pzBuffer;

}

const XMLCh*    DOMNodeImpl::getTextContent(XMLCh* pzBuffer, unsigned int& rnBufferLength) const
{

	unsigned int nRemainingBuffer = rnBufferLength;
	rnBufferLength = 0;

	if (pzBuffer)   
		*pzBuffer = 0;

	DOMNode *thisNode = castToNode(this);

	switch (thisNode->getNodeType())
	{
	case DOMNode::ELEMENT_NODE:
    case DOMNode::ENTITY_NODE:
    case DOMNode::ENTITY_REFERENCE_NODE:
    case DOMNode::DOCUMENT_FRAGMENT_NODE:
    {
		DOMNode* current = thisNode->getFirstChild();

		while (current != NULL) 
		{
			if (current->getNodeType() != DOMNode::COMMENT_NODE &&
				current->getNodeType() != DOMNode::PROCESSING_INSTRUCTION_NODE)
			{

				if (pzBuffer)
				{
					unsigned int nContentLength = nRemainingBuffer;
					castToNodeImpl(current)->getTextContent(pzBuffer + rnBufferLength, nContentLength);
					rnBufferLength += nContentLength;
					nRemainingBuffer -= nContentLength;
				}
				else 
				{
					unsigned int nContentLength = 0;
					castToNodeImpl(current)->getTextContent(NULL, nContentLength);
					rnBufferLength += nContentLength;
				}
			}

			current = current->getNextSibling();

		}
    }

    break;

    case DOMNode::ATTRIBUTE_NODE:
    case DOMNode::TEXT_NODE:
    case DOMNode::CDATA_SECTION_NODE:
    case DOMNode::COMMENT_NODE:
    case DOMNode::PROCESSING_INSTRUCTION_NODE:
    {
		const XMLCh* pzValue = thisNode->getNodeValue();
		unsigned int nStrLen = XMLString::stringLen(pzValue);

		if (pzBuffer) 
		{
			unsigned int nContentLength = (nRemainingBuffer >= nStrLen) ? nStrLen : nRemainingBuffer;
			XMLString::copyNString(pzBuffer + rnBufferLength, pzValue, nContentLength);
			rnBufferLength += nContentLength;
			nRemainingBuffer -= nContentLength;
		}
		else 
		{
			rnBufferLength += nStrLen;
		}

    }

    break;

	/***
         DOCUMENT_NODE
		 DOCUMENT_TYPE_NODE
		 NOTATION_NODE
	***/
	default:

		break;
	}

	return pzBuffer;

}

void DOMNodeImpl::setTextContent(const XMLCh* textContent){
    DOMNode *thisNode = castToNode(this);
    switch (thisNode->getNodeType()) 
    {
        case DOMNode::ELEMENT_NODE:
        case DOMNode::ENTITY_NODE:
        case DOMNode::ENTITY_REFERENCE_NODE:
        case DOMNode::DOCUMENT_FRAGMENT_NODE:
            {
                if (isReadOnly())
                  throw DOMException(DOMException::NO_MODIFICATION_ALLOWED_ERR, 0, GetDOMNodeMemoryManager);

                // Remove all childs
                DOMNode* current = thisNode->getFirstChild();
                while (current != NULL) 
                {
                    thisNode->removeChild(current);
                    current = thisNode->getFirstChild();
                }
                if (textContent != NULL) 
                {
                    // Add textnode containing data
                    current = ((DOMDocumentImpl*)thisNode->getOwnerDocument())->createTextNode(textContent);
                    thisNode->appendChild(current);
                }
            }
            break;

        case DOMNode::ATTRIBUTE_NODE:
        case DOMNode::TEXT_NODE:
        case DOMNode::CDATA_SECTION_NODE:
        case DOMNode::COMMENT_NODE:
        case DOMNode::PROCESSING_INSTRUCTION_NODE:
            if (isReadOnly())
                throw DOMException(DOMException::NO_MODIFICATION_ALLOWED_ERR, 0, GetDOMNodeMemoryManager);

            thisNode->setNodeValue(textContent);
            break;

        case DOMNode::DOCUMENT_NODE:
        case DOMNode::DOCUMENT_TYPE_NODE:
        case DOMNode::NOTATION_NODE:
            break;

        default:
            throw DOMException(DOMException::NOT_SUPPORTED_ERR, 0, GetDOMNodeMemoryManager);
    }
}


bool DOMNodeImpl::isDefaultNamespace(const XMLCh* namespaceURI) const{
	DOMNode *thisNode = castToNode(this);
    short type = thisNode->getNodeType();
    switch (type) {
    case DOMNode::ELEMENT_NODE: {
        const XMLCh *prefix = thisNode->getPrefix();

        // REVISIT: is it possible that prefix is empty string?
        if (prefix == 0 || !*prefix) {
            return XMLString::equals(namespaceURI, thisNode->getNamespaceURI());
        }

        if (thisNode->hasAttributes()) {
            DOMElement *elem = (DOMElement *)thisNode;
            DOMNode *attr = elem->getAttributeNodeNS(XMLUni::fgXMLNSURIName, XMLUni::fgXMLNSString);
            if (attr != 0) {
                const XMLCh *value = attr->getNodeValue();
                return XMLString::equals(namespaceURI, value);
            }
        }
        DOMNode *ancestor = getElementAncestor(thisNode);
        if (ancestor != 0) {
            return ancestor->isDefaultNamespace(namespaceURI);
        }

        return false;
    }
    case DOMNode::DOCUMENT_NODE:{
        return ((DOMDocument*)thisNode)->getDocumentElement()->isDefaultNamespace(namespaceURI);
    }

    case DOMNode::ENTITY_NODE :
    case DOMNode::NOTATION_NODE:
    case DOMNode::DOCUMENT_FRAGMENT_NODE:
    case DOMNode::DOCUMENT_TYPE_NODE:
        // type is unknown
        return false;
    case DOMNode::ATTRIBUTE_NODE:{
        if (fOwnerNode->getNodeType() == DOMNode::ELEMENT_NODE) {
            return fOwnerNode->isDefaultNamespace(namespaceURI);

        }
        return false;
    }
    default:{
        DOMNode *ancestor = getElementAncestor(thisNode);
        if (ancestor != 0) {
            return ancestor->isDefaultNamespace(namespaceURI);
        }
        return false;
    }

    }
}

DOMNode*         DOMNodeImpl::getInterface(const XMLCh*)      {
    throw DOMException(DOMException::NOT_SUPPORTED_ERR, 0, GetDOMNodeMemoryManager);
    return 0;
}


// non-standard extension
void DOMNodeImpl::release()
{
    // shouldn't reach here
    throw DOMException(DOMException::INVALID_ACCESS_ERR,0, GetDOMNodeMemoryManager);
}

XERCES_CPP_NAMESPACE_END