IDCasts.hpp
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上传日期:2007-01-10
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- #ifndef IDCasts_HEADER_GUARD_
- #define IDCasts_HEADER_GUARD_
- /*
- * The Apache Software License, Version 1.1
- *
- * Copyright (c) 2001 The Apache Software Foundation. All rights
- * reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- *
- * 3. The end-user documentation included with the redistribution,
- * if any, must include the following acknowledgment:
- * "This product includes software developed by the
- * Apache Software Foundation (http://www.apache.org/)."
- * Alternately, this acknowledgment may appear in the software itself,
- * if and wherever such third-party acknowledgments normally appear.
- *
- * 4. The names "Xerces" and "Apache Software Foundation" must
- * not be used to endorse or promote products derived from this
- * software without prior written permission. For written
- * permission, please contact apache@apache.org.
- *
- * 5. Products derived from this software may not be called "Apache",
- * nor may "Apache" appear in their name, without prior written
- * permission of the Apache Software Foundation.
- *
- * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
- * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
- * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
- * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
- * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
- * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- * ====================================================================
- *
- * This software consists of voluntary contributions made by many
- * individuals on behalf of the Apache Software Foundation, and was
- * originally based on software copyright (c) 2001, International
- * Business Machines, Inc., http://www.ibm.com . For more information
- * on the Apache Software Foundation, please see
- * <http://www.apache.org/>.
- */
- /*
- * $Id: IDCasts.hpp,v 1.3 2001/10/22 12:43:02 tng Exp $
- */
- //
- // 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 <dom/DOM.hpp> for the entire
- // DOM API, or DOM_*.hpp for individual DOM classes, where the class
- // name is substituded for the *.
- //
- //
- // Define inline casting functions to convert from
- // (IDOM_Node *) to IDParentNode or IDChildNode *.
- //
- // 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
- // IDNodeImpl fNode;
- // IDParentNode fParent;
- // IDChildNode fChild;
- // ... // other fields, depending on node type.
- //
- // Nodetypes that can not have children, e.g. TEXT
- //
- // Object
- // IDNodeImpl fNode;
- // IDChildNode 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
- // IDNodeImpl fNode;
- // IDParentNode 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 "IDElementImpl.hpp"
- #include "IDTextImpl.hpp"
- static inline IDNodeImpl *castToNodeImpl(const IDOM_Node *p)
- {
- IDElementImpl *pE = (IDElementImpl *)p;
- return &(pE->fNode);
- }
- static inline IDParentNode *castToParentImpl(const IDOM_Node *p) {
- IDElementImpl *pE = (IDElementImpl *)p;
- return &(pE->fParent);
- }
- static inline IDChildNode *castToChildImpl(const IDOM_Node *p) {
- IDElementImpl *pE = (IDElementImpl *)p;
- if (pE->fNode.isLeafNode()) {
- IDTextImpl *pT = (IDTextImpl *)p;
- return &(pT->fChild);
- }
- return &(pE->fChild);
- }
- static inline IDOM_Node *castToNode(const IDParentNode *p ) {
- int parentOffset = (char *)&(((IDElementImpl *)0)->fParent) - (char *)0;
- char *retPtr = (char *)p - parentOffset;
- return (IDOM_Node *)retPtr;
- }
- static inline IDOM_Node *castToNode(const IDNodeImpl *p) {
- int nodeImplOffset = (char *)&(((IDElementImpl *)0)->fNode) - (char *)0;
- char *retPtr = (char *)p - nodeImplOffset;
- return (IDOM_Node *)retPtr;
- }
- static inline IDNodeImpl *castToNodeImpl(const IDParentNode *p)
- {
- int nodeImplOffset = (char *)&(((IDElementImpl *)0)->fNode) - (char *)0;
- int parentOffset = (char *)&(((IDElementImpl *)0)->fParent) - (char *)0;
- char *retPtr = (char *)p - parentOffset + nodeImplOffset;
- return (IDNodeImpl *)retPtr;
- }
- #endif