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XNull.hpp

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00001 /*
00002  * The Apache Software License, Version 1.1
00003  *
00004  *
00005  * Copyright (c) 1999 The Apache Software Foundation.  All rights 
00006  * reserved.
00007  *
00008  * Redistribution and use in source and binary forms, with or without
00009  * modification, are permitted provided that the following conditions
00010  * are met:
00011  *
00012  * 1. Redistributions of source code must retain the above copyright
00013  *    notice, this list of conditions and the following disclaimer. 
00014  *
00015  * 2. Redistributions in binary form must reproduce the above copyright
00016  *    notice, this list of conditions and the following disclaimer in
00017  *    the documentation and/or other materials provided with the
00018  *    distribution.
00019  *
00020  * 3. The end-user documentation included with the redistribution,
00021  *    if any, must include the following acknowledgment:  
00022  *       "This product includes software developed by the
00023  *        Apache Software Foundation (http://www.apache.org/)."
00024  *    Alternately, this acknowledgment may appear in the software itself,
00025  *    if and wherever such third-party acknowledgments normally appear.
00026  *
00027  * 4. The names "Xalan" and "Apache Software Foundation" must
00028  *    not be used to endorse or promote products derived from this
00029  *    software without prior written permission. For written 
00030  *    permission, please contact apache@apache.org.
00031  *
00032  * 5. Products derived from this software may not be called "Apache",
00033  *    nor may "Apache" appear in their name, without prior written
00034  *    permission of the Apache Software Foundation.
00035  *
00036  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
00037  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
00038  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
00039  * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
00040  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
00041  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
00042  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
00043  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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00045  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
00046  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
00047  * SUCH DAMAGE.
00048  * ====================================================================
00049  *
00050  * This software consists of voluntary contributions made by many
00051  * individuals on behalf of the Apache Software Foundation and was
00052  * originally based on software copyright (c) 1999, International
00053  * Business Machines, Inc., http://www.ibm.com.  For more
00054  * information on the Apache Software Foundation, please see
00055  * <http://www.apache.org/>.
00056  */
00057 #if !defined(XNULL_HEADER_GUARD_1357924680)
00058 #define XNULL_HEADER_GUARD_1357924680
00059 
00060 
00061 
00062 // Base header file.  Must be first.
00063 #include <XPath/XPathDefinitions.hpp>
00064 
00065 
00066 
00067 // Base class header file.
00068 #include <XPath/XObject.hpp>
00069 
00070 
00071 
00072 class XALAN_XPATH_EXPORT XNull : public XObject
00073 {
00074 public:
00075 
00080     explicit
00081     XNull();
00082 
00089     XNull(const XNull&  source);
00090 
00091     virtual
00092     ~XNull();
00093 
00094     // These methods are inherited from XObject ...
00095 
00096 #if defined(XALAN_NO_COVARIANT_RETURN_TYPE)
00097     virtual XObject*
00098 #else
00099     virtual XNull*
00100 #endif
00101     clone(void*     theAddress = 0) const;
00102 
00103     virtual XalanDOMString
00104     getTypeString() const;
00105 
00106     virtual double
00107     num() const;
00108 
00109     virtual bool
00110     boolean() const;
00111 
00112     virtual const XalanDOMString&
00113     str() const;
00114 
00115     virtual void
00116     str(
00117             FormatterListener&  formatterListener,
00118             MemberFunctionPtr   function) const;
00119 
00120     virtual void
00121     ProcessXObjectTypeCallback(XObjectTypeCallback&     theCallbackObject);
00122 
00123     virtual void
00124     ProcessXObjectTypeCallback(XObjectTypeCallback&     theCallbackObject) const;
00125 
00126 private:
00127 
00128     // not implemented
00129     XNull& operator=(const XNull &);
00130 };
00131 
00132 
00133 
00134 #endif  // XNULL_HEADER_GUARD_1357924680

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