source: NonGTP/Xerces/xercesc/dom/impl/DOMCasts.hpp @ 188

Revision 188, 6.2 KB checked in by mattausch, 19 years ago (diff)

added xercesc to support

Line 
1#ifndef DOMCasts_HEADER_GUARD_
2#define DOMCasts_HEADER_GUARD_
3
4/*
5 * The Apache Software License, Version 1.1
6 *
7 * Copyright (c) 2001-2002 The Apache Software Foundation.  All rights
8 * reserved.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 *
14 * 1. Redistributions of source code must retain the above copyright
15 *    notice, this list of conditions and the following disclaimer.
16 *
17 * 2. Redistributions in binary form must reproduce the above copyright
18 *    notice, this list of conditions and the following disclaimer in
19 *    the documentation and/or other materials provided with the
20 *    distribution.
21 *
22 * 3. The end-user documentation included with the redistribution,
23 *    if any, must include the following acknowledgment:
24 *       "This product includes software developed by the
25 *        Apache Software Foundation (http://www.apache.org/)."
26 *    Alternately, this acknowledgment may appear in the software itself,
27 *    if and wherever such third-party acknowledgments normally appear.
28 *
29 * 4. The names "Xerces" and "Apache Software Foundation" must
30 *    not be used to endorse or promote products derived from this
31 *    software without prior written permission. For written
32 *    permission, please contact apache\@apache.org.
33 *
34 * 5. Products derived from this software may not be called "Apache",
35 *    nor may "Apache" appear in their name, without prior written
36 *    permission of the Apache Software Foundation.
37 *
38 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
39 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
40 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
41 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
42 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
43 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
44 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
45 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
46 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
47 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
48 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
49 * SUCH DAMAGE.
50 * ====================================================================
51 *
52 * This software consists of voluntary contributions made by many
53 * individuals on behalf of the Apache Software Foundation, and was
54 * originally based on software copyright (c) 2001, International
55 * Business Machines, Inc., http://www.ibm.com .  For more information
56 * on the Apache Software Foundation, please see
57 * <http://www.apache.org/>.
58 */
59
60/*
61 * $Id: DOMCasts.hpp,v 1.2 2002/11/04 15:07:34 tng Exp $
62 */
63
64//
65//  This file is part of the internal implementation of the C++ XML DOM.
66//  It should NOT be included or used directly by application programs.
67//
68//  Applications should include the file <xercesc/dom/DOM.hpp> for the entire
69//  DOM API, or xercesc/dom/DOM*.hpp for individual DOM classes, where the class
70//  name is substituded for the *.
71//
72
73//
74//  Define inline casting functions to convert from
75//    (DOMNode *) to DOMParentNode or DOMChildNode *.
76//
77//  This requires knowledge of the structure of the fields of
78//   for all node types.  There are three categories -
79//
80//  Nodetypes that can have children and can be a child themselves.
81//    e.g.  Elements
82//
83//       Object
84//           DOMNodeImpl     fNode;
85//           DOMParentNode   fParent;
86//           DOMChildNode    fChild;
87//             ...            // other fields, depending on node type.
88//
89//  Nodetypes that can not have children, e.g. TEXT
90//
91//       Object
92//           DOMNodeImpl     fNode;
93//           DOMChildNode    fChild;
94//              ...            // other fields, depending on node type
95//
96//  Nodetypes that can not be a child of other nodes, but that can
97//  have children (are a parent)  e.g. ATTR
98//       Object
99//           DOMNodeImpl     fNode;
100//           DOMParentNode   fParent
101//               ...           // other fields, depending on node type
102//
103//   The casting functions make these assumptions:
104//      1.  The cast is possible.  Using code will not attempt to
105//          cast to something that does not exist, such as the child
106//          part of an ATTR
107//
108//      2.  The nodes belong to this implementation.
109//
110//    Some of the casts use the LEAFNODE flag in the common fNode part to
111//    determine whether an fParent field exists, and thus the
112//    position of the fChild part within the node.
113//
114//  These functions also cast off const.  It was either do that, or make
115//  a second overloaded set that took and returned const arguements.
116//
117
118#include "DOMElementImpl.hpp"
119#include "DOMTextImpl.hpp"
120
121XERCES_CPP_NAMESPACE_BEGIN
122
123
124static inline DOMNodeImpl *castToNodeImpl(const DOMNode *p)
125{
126    DOMElementImpl *pE = (DOMElementImpl *)p;
127    return &(pE->fNode);
128}
129
130
131static inline DOMParentNode *castToParentImpl(const DOMNode *p) {
132    DOMElementImpl *pE = (DOMElementImpl *)p;
133    return &(pE->fParent);
134}
135
136
137static inline DOMChildNode *castToChildImpl(const DOMNode *p) {
138    DOMElementImpl *pE = (DOMElementImpl *)p;
139    if (pE->fNode.isLeafNode())  {
140        DOMTextImpl *pT = (DOMTextImpl *)p;
141        return &(pT->fChild);
142    }
143    return &(pE->fChild);
144}
145
146
147static inline DOMNode *castToNode(const DOMParentNode *p ) {
148    int parentOffset = (char *)&(((DOMElementImpl *)0)->fParent) - (char *)0;
149    char *retPtr = (char *)p - parentOffset;
150    return (DOMNode *)retPtr;
151}
152
153static inline DOMNode *castToNode(const DOMNodeImpl *p) {
154    int nodeImplOffset = (char *)&(((DOMElementImpl *)0)->fNode) - (char *)0;
155    char *retPtr = (char *)p - nodeImplOffset;
156    return (DOMNode *)retPtr;
157}
158
159
160static inline DOMNodeImpl *castToNodeImpl(const DOMParentNode *p)
161{
162    int nodeImplOffset = (char *)&(((DOMElementImpl *)0)->fNode) - (char *)0;
163    int parentOffset = (char *)&(((DOMElementImpl *)0)->fParent) - (char *)0;
164    char *retPtr = (char *)p - parentOffset + nodeImplOffset;
165    return (DOMNodeImpl *)retPtr;
166}
167
168XERCES_CPP_NAMESPACE_END
169
170#endif
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