00001 /* 00002 * Copyright 1999-2004 The Apache Software Foundation. 00003 * 00004 * Licensed under the Apache License, Version 2.0 (the "License"); 00005 * you may not use this file except in compliance with the License. 00006 * You may obtain a copy of the License at 00007 * 00008 * http://www.apache.org/licenses/LICENSE-2.0 00009 * 00010 * Unless required by applicable law or agreed to in writing, software 00011 * distributed under the License is distributed on an "AS IS" BASIS, 00012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 00013 * See the License for the specific language governing permissions and 00014 * limitations under the License. 00015 */ 00016 #if !defined(XNULL_HEADER_GUARD_1357924680) 00017 #define XNULL_HEADER_GUARD_1357924680 00018 00019 00020 00021 // Base header file. Must be first. 00022 #include <xalanc/XPath/XPathDefinitions.hpp> 00023 00024 00025 00026 // Base class header file. 00027 #include <xalanc/XPath/XObject.hpp> 00028 00029 00030 00031 XALAN_CPP_NAMESPACE_BEGIN 00032 00033 00034 00035 class XALAN_XPATH_EXPORT XNull : public XObject 00036 { 00037 public: 00038 00039 typedef XObject ParentType; 00040 00044 static void 00045 initialize(); 00046 00050 static void 00051 terminate(); 00052 00057 explicit 00058 XNull(); 00059 00066 XNull(const XNull& source); 00067 00068 virtual 00069 ~XNull(); 00070 00071 // These methods are inherited from XObject ... 00072 00073 virtual const XalanDOMString& 00074 getTypeString() const; 00075 00076 virtual double 00077 num() const; 00078 00079 virtual bool 00080 boolean() const; 00081 00082 virtual const XalanDOMString& 00083 str() const; 00084 00085 virtual void 00086 str( 00087 FormatterListener& formatterListener, 00088 MemberFunctionPtr function) const; 00089 00090 #if !defined(XALAN_NO_USING_DECLARATION) 00091 using ParentType::str; 00092 #endif 00093 00094 virtual double 00095 stringLength() const; 00096 00097 virtual void 00098 ProcessXObjectTypeCallback(XObjectTypeCallback& theCallbackObject); 00099 00100 virtual void 00101 ProcessXObjectTypeCallback(XObjectTypeCallback& theCallbackObject) const; 00102 00103 private: 00104 00105 static XalanDOMString s_nullString; 00106 00107 // not implemented 00108 XNull& operator=(const XNull &); 00109 }; 00110 00111 00112 00113 XALAN_CPP_NAMESPACE_END 00114 00115 00116 00117 #endif // XNULL_HEADER_GUARD_1357924680
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