domnodeimpl.cpp

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/*
 * Copyright 2001-2004 The Apache Software Foundation.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/*
 * $Id: DOMNodeImpl.cpp,v 1.34 2004/09/08 13:55:52 peiyongz Exp $
 */

// This class doesn't support having any children, and implements the behavior
// of an empty NodeList as far getChildNodes is concerned.
// The ParentNode subclass overrides this behavior.


#include "DOMCasts.hpp"

#include "DOMDocumentTypeImpl.hpp"
#include "DOMElementImpl.hpp"
#include "DOMAttrImpl.hpp"

#include <xercesc/dom/DOMImplementation.hpp>
#include <xercesc/dom/DOMException.hpp>

#include <xercesc/util/XMLUniDefs.hpp>
#include <xercesc/util/XMLRegisterCleanup.hpp>
#include <xercesc/util/PlatformUtils.hpp>
#include <stdio.h>
#include <assert.h>

XERCES_CPP_NAMESPACE_BEGIN

//Though DOMNodeImpl does not derivate from DOMNode, it shares
//the same GetDOMNodeMemoryManager

const unsigned short DOMNodeImpl::READONLY     = 0x1<<0;
const unsigned short DOMNodeImpl::SYNCDATA     = 0x1<<1;
const unsigned short DOMNodeImpl::SYNCCHILDREN = 0x1<<2;
const unsigned short DOMNodeImpl::OWNED        = 0x1<<3;
const unsigned short DOMNodeImpl::FIRSTCHILD   = 0x1<<4;
const unsigned short DOMNodeImpl::SPECIFIED    = 0x1<<5;
const unsigned short DOMNodeImpl::IGNORABLEWS  = 0x1<<6;
const unsigned short DOMNodeImpl::SETVALUE     = 0x1<<7;
const unsigned short DOMNodeImpl::ID_ATTR      = 0x1<<8;
const unsigned short DOMNodeImpl::USERDATA     = 0x1<<9;
const unsigned short DOMNodeImpl::LEAFNODETYPE = 0x1<<10;
const unsigned short DOMNodeImpl::CHILDNODE    = 0x1<<11;
const unsigned short DOMNodeImpl::TOBERELEASED = 0x1<<12;

// -----------------------------------------------------------------------
//  Reset the singleton gEmptyNodeList
// -----------------------------------------------------------------------
static DOMNodeListImpl *gEmptyNodeList = 0;  // make a singleton empty node list
static XMLMutex* gEmptyNodeListMutex = 0;
static XMLRegisterCleanup emptyNodeListCleanup;

static void reinitEmptyNodeList()
{
    delete gEmptyNodeList;
    gEmptyNodeList = 0;

    delete gEmptyNodeListMutex;
    gEmptyNodeListMutex = 0;
}

// -----------------------------------------------------------------------
//  DOMNodeImpl Functions
// -----------------------------------------------------------------------
DOMNodeImpl::DOMNodeImpl(DOMNode *ownerNode)
:  fOwnerNode(ownerNode)
{
    this->flags = 0;
    // as long as we do not have any owner, fOwnerNode is our ownerDocument    
}

// This only makes a shallow copy, cloneChildren must also be called for a
// deep clone
DOMNodeImpl::DOMNodeImpl(const DOMNodeImpl &other)
{
    this->flags = other.flags;
    this->isReadOnly(false);

    // Need to break the association w/ original parent
    this->fOwnerNode = other.getOwnerDocument();
    this->isOwned(false);
}



DOMNodeImpl::~DOMNodeImpl() {
}


DOMNode * DOMNodeImpl::appendChild(DOMNode *)
{
    // Only node types that don't allow children will use this default function.
    //   Others will go to DOMParentNode::appendChild.
    throw DOMException(DOMException::HIERARCHY_REQUEST_ERR,0, GetDOMNodeMemoryManager);
    return 0;
    //  return insertBefore(newChild, 0);
}


DOMNamedNodeMap * DOMNodeImpl::getAttributes() const {
    return 0;                   // overridden in ElementImpl
}


DOMNodeList *DOMNodeImpl::getChildNodes() const {

    if (!gEmptyNodeList)
    {
        if (!gEmptyNodeListMutex)
        {
            XMLMutexLock lock(XMLPlatformUtils::fgAtomicMutex);
			
            if (!gEmptyNodeListMutex)
                gEmptyNodeListMutex = new XMLMutex;
        }

        // Use a faux scope to synchronize while we do this
        {
            XMLMutexLock lock(gEmptyNodeListMutex);

            if (!gEmptyNodeList)
            {
                gEmptyNodeList = new DOMNodeListImpl(0);
                emptyNodeListCleanup.registerCleanup(reinitEmptyNodeList);
            }
        }
    }

    return (DOMNodeList *)gEmptyNodeList;
}



DOMNode * DOMNodeImpl::getFirstChild() const {
    return 0;                   // overridden in ParentNode
}


DOMNode * DOMNodeImpl::getLastChild() const
{
    return 0;                   // overridden in ParentNode
}


DOMNode * DOMNodeImpl::getNextSibling() const {
    return 0;                // overridden in ChildNode
}


const XMLCh * DOMNodeImpl::getNodeValue() const {
    return 0;                    // Overridden by anything that has a value
}


//
//  Unlike the external getOwnerDocument, this one returns the owner document
//     for document nodes as well as all of the other node types.
//
DOMDocument *DOMNodeImpl::getOwnerDocument() const
{
    if (!this->isLeafNode())
    {
        DOMElementImpl *ep = (DOMElementImpl *)castToNode(this);
        return ep->fParent.fOwnerDocument;
    }

    //  Leaf node types - those that cannot have children, like Text.
    if (isOwned()) {

        DOMDocument* ownerDoc = fOwnerNode->getOwnerDocument();

        if (!ownerDoc) {

            assert (fOwnerNode->getNodeType() == DOMNode::DOCUMENT_NODE);
            return  (DOMDocument *)fOwnerNode;
        }
        else {
            return ownerDoc;
        }
    } else {
        assert (fOwnerNode->getNodeType() == DOMNode::DOCUMENT_NODE);
        return  (DOMDocument *)fOwnerNode;
    }
}


void DOMNodeImpl::setOwnerDocument(DOMDocument *doc) {
    // if we have an owner we rely on it to have it right
    // otherwise fOwnerNode is our ownerDocument
    if (!isOwned()) {
        // revisit.  Problem with storage for doctype nodes that were created
        //                on the system heap in advance of having a document.
        fOwnerNode = doc;
    }
}

DOMNode * DOMNodeImpl::getParentNode() const
{
    return 0;                // overridden in ChildNode
}


DOMNode*  DOMNodeImpl::getPreviousSibling() const
{
    return 0;                // overridden in ChildNode
}

bool DOMNodeImpl::hasChildNodes() const
{
    return false;
}



DOMNode *DOMNodeImpl::insertBefore(DOMNode *, DOMNode *) {
    throw DOMException(DOMException::HIERARCHY_REQUEST_ERR, 0, GetDOMNodeMemoryManager);
    return 0;
}


DOMNode *DOMNodeImpl::removeChild(DOMNode *)
{
    throw DOMException(DOMException::NOT_FOUND_ERR, 0, GetDOMNodeMemoryManager);
    return 0;
}


DOMNode *DOMNodeImpl::replaceChild(DOMNode *, DOMNode *)
{
    throw DOMException(DOMException::HIERARCHY_REQUEST_ERR,0, GetDOMNodeMemoryManager);
    return 0;
}



void DOMNodeImpl::setNodeValue(const XMLCh *)
{
    // Default behavior is to do nothing, overridden in some subclasses
}



void DOMNodeImpl::setReadOnly(bool readOnl, bool deep)
{
    this->isReadOnly(readOnl);

    if (deep) {
        for (DOMNode *mykid = castToNode(this)->getFirstChild();
            mykid != 0;
            mykid = mykid->getNextSibling()) {

            short kidNodeType = mykid->getNodeType();

            switch (kidNodeType) {
            case DOMNode::ENTITY_REFERENCE_NODE:
                break;
            case DOMNode::ELEMENT_NODE:
                ((DOMElementImpl*) mykid)->setReadOnly(readOnl, true);
                break;
            case DOMNode::DOCUMENT_TYPE_NODE:
               ((DOMDocumentTypeImpl*) mykid)->setReadOnly(readOnl, true);
               break;
            default:
                castToNodeImpl(mykid)->setReadOnly(readOnl, true);
                break;
            }
        }
    }
}


//Introduced in DOM Level 2

void DOMNodeImpl::normalize()
{
    // does nothing by default, overridden by subclasses
}


bool DOMNodeImpl::isSupported(const XMLCh *feature, const XMLCh *version) const
{
    return DOMImplementation::getImplementation()->hasFeature(feature, version);
}

const XMLCh *DOMNodeImpl::getNamespaceURI() const
{
    return 0;
}

const XMLCh *DOMNodeImpl::getPrefix() const
{
    return 0;
}

const XMLCh *DOMNodeImpl::getLocalName() const
{
    return 0;
}


void DOMNodeImpl::setPrefix(const XMLCh *)
{
    throw DOMException(DOMException::NAMESPACE_ERR, 0, GetDOMNodeMemoryManager);
}


bool DOMNodeImpl::hasAttributes() const {
    return 0;                   // overridden in ElementImpl
}





const XMLCh *DOMNodeImpl::getXmlString()      {return XMLUni::fgXMLString;}
const XMLCh *DOMNodeImpl::getXmlURIString()   {return XMLUni::fgXMLURIName;}
const XMLCh *DOMNodeImpl::getXmlnsString()    {return XMLUni::fgXMLNSString;}
const XMLCh *DOMNodeImpl::getXmlnsURIString() {return XMLUni::fgXMLNSURIName;}

//Return a URI mapped from the given prefix and namespaceURI as below
//    prefix   namespaceURI    output
//---------------------------------------------------
//    "xml"     xmlURI          xmlURI
//    "xml"     otherwise       NAMESPACE_ERR
//    "xmlns"   xmlnsURI        xmlnsURI (nType = ATTRIBUTE_NODE only)
//    "xmlns"   otherwise       NAMESPACE_ERR (nType = ATTRIBUTE_NODE only)
//    != null   null or ""      NAMESPACE_ERR
//    else      any             namesapceURI
const XMLCh* DOMNodeImpl::mapPrefix(const XMLCh *prefix,
                                     const XMLCh *namespaceURI, short nType)
{
    if (prefix == 0)
        return namespaceURI;

    if (XMLString::equals(prefix, XMLUni::fgXMLString))  {
        if (XMLString::equals(namespaceURI, XMLUni::fgXMLURIName))
            return XMLUni::fgXMLURIName;
        throw DOMException(DOMException::NAMESPACE_ERR, 0);
    } else if (nType == DOMNode::ATTRIBUTE_NODE && XMLString::equals(prefix, XMLUni::fgXMLNSString)) {
        if (XMLString::equals(namespaceURI, XMLUni::fgXMLNSURIName))
            return XMLUni::fgXMLNSURIName;
        throw DOMException(DOMException::NAMESPACE_ERR, 0);
    } else if (namespaceURI == 0 || *namespaceURI == 0) {
        throw DOMException(DOMException::NAMESPACE_ERR, 0);
    } else
        return namespaceURI;
    return namespaceURI;
}

//Introduced in DOM Level 3
void* DOMNodeImpl::setUserData(const XMLCh* key, void* data, DOMUserDataHandler* handler)
{
   if (!data && !hasUserData())
       return 0;

    hasUserData(true);
    return ((DOMDocumentImpl*)getOwnerDocument())->setUserData(this, key, data, handler);