DOMNodeImpl.cpp

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.
 */

/*
 * $Id$
 */

// 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/PlatformUtils.hpp>
#include <xercesc/util/XMLInitializer.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;

//
//
static DOMNodeListImpl *gEmptyNodeList = 0; // Singleton empty node list.

void XMLInitializer::initializeDOMNodeListImpl()
{
    gEmptyNodeList = new DOMNodeListImpl(0);
}

void XMLInitializer::terminateDOMNodeListImpl()
{
    delete gEmptyNodeList;
    gEmptyNodeList = 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 {
    return 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
{