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#ifndef DOMCasts_HEADER_GUARD_
#define DOMCasts_HEADER_GUARD_
/*
* Copyright 2001-2002,2004 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.
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*/
/*
* $Id$
*/
//
// This file is part of the internal implementation of the C++ XML DOM.
// It should NOT be included or used directly by application programs.
//
// Applications should include the file <xercesc/dom/DOM.hpp> for the entire
// DOM API, or xercesc/dom/DOM*.hpp for individual DOM classes, where the class
// name is substituded for the *.
//
//
// Define inline casting functions to convert from
// (DOMNode *) to DOMParentNode or DOMChildNode *.
//
// This requires knowledge of the structure of the fields of
// for all node types. There are three categories -
//
// Nodetypes that can have children and can be a child themselves.
// e.g. Elements
//
// Object
// DOMNodeImpl fNode;
// DOMParentNode fParent;
// DOMChildNode fChild;
// ... // other fields, depending on node type.
//
// Nodetypes that can not have children, e.g. TEXT
//
// Object
// DOMNodeImpl fNode;
// DOMChildNode fChild;
// ... // other fields, depending on node type
//
// Nodetypes that can not be a child of other nodes, but that can
// have children (are a parent) e.g. ATTR
// Object
// DOMNodeImpl fNode;
// DOMParentNode fParent
// ... // other fields, depending on node type
//
// The casting functions make these assumptions:
// 1. The cast is possible. Using code will not attempt to
// cast to something that does not exist, such as the child
// part of an ATTR
//
// 2. The nodes belong to this implementation.
//
// Some of the casts use the LEAFNODE flag in the common fNode part to
// determine whether an fParent field exists, and thus the
// position of the fChild part within the node.
//
// These functions also cast off const. It was either do that, or make
// a second overloaded set that took and returned const arguements.
//
#include "DOMElementImpl.hpp"
#include "DOMTextImpl.hpp"
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static inline DOMNodeImpl *castToNodeImpl(const DOMNode *p)
{
DOMElementImpl *pE = (DOMElementImpl *)p;
return &(pE->fNode);
}
static inline DOMParentNode *castToParentImpl(const DOMNode *p) {
DOMElementImpl *pE = (DOMElementImpl *)p;
return &(pE->fParent);
}
static inline DOMChildNode *castToChildImpl(const DOMNode *p) {
DOMElementImpl *pE = (DOMElementImpl *)p;
if (pE->fNode.isLeafNode()) {
DOMTextImpl *pT = (DOMTextImpl *)p;
return &(pT->fChild);
}
return &(pE->fChild);
}
static inline DOMNode *castToNode(const DOMParentNode *p ) {
int parentOffset = (char *)&(((DOMElementImpl *)0)->fParent) - (char *)0;
char *retPtr = (char *)p - parentOffset;
return (DOMNode *)retPtr;
}
static inline DOMNode *castToNode(const DOMNodeImpl *p) {
int nodeImplOffset = (char *)&(((DOMElementImpl *)0)->fNode) - (char *)0;
char *retPtr = (char *)p - nodeImplOffset;
return (DOMNode *)retPtr;
}
static inline DOMNodeImpl *castToNodeImpl(const DOMParentNode *p)
{
int nodeImplOffset = (char *)&(((DOMElementImpl *)0)->fNode) - (char *)0;
int parentOffset = (char *)&(((DOMElementImpl *)0)->fParent) - (char *)0;
char *retPtr = (char *)p - parentOffset + nodeImplOffset;
return (DOMNodeImpl *)retPtr;
}