| FDO API Reference | Feature Data Objects |
00001 #ifndef _EXPRESSION_H_ 00002 #define _EXPRESSION_H_ 00003 // 00004 00005 // 00006 // Copyright (C) 2004-2006 Autodesk, Inc. 00007 // 00008 // This library is free software; you can redistribute it and/or 00009 // modify it under the terms of version 2.1 of the GNU Lesser 00010 // General Public License as published by the Free Software Foundation. 00011 // 00012 // This library is distributed in the hope that it will be useful, 00013 // but WITHOUT ANY WARRANTY; without even the implied warranty of 00014 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00015 // Lesser General Public License for more details. 00016 // 00017 // You should have received a copy of the GNU Lesser General Public 00018 // License along with this library; if not, write to the Free Software 00019 // Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 00020 // 00021 00022 #ifdef _WIN32 00023 #pragma once 00024 #endif 00025 00026 #include <FdoStd.h> 00027 00028 class FdoIExpressionProcessor; 00029 class FdoIdentifierCollection; 00030 00031 /// \brief 00032 /// FdoExpression is an abstract base class that forms the root of an expression 00033 /// tree. The FdoExpression class contains operations for converting between the 00034 /// well defined text representation and the object representation of an 00035 /// expression. 00036 class FdoExpression : public FdoIDisposable 00037 { 00038 protected: 00039 /// \cond DOXYGEN-IGNORE 00040 FdoExpression(); 00041 virtual ~FdoExpression(); 00042 /// \endcond 00043 00044 public: 00045 /// \brief 00046 /// Static operation that parses the specified text and returns an 00047 /// expression. An exception is thrown if the text does not conform to the 00048 /// well defined text representation of an expression. 00049 /// 00050 /// \param expressionText 00051 /// Input expression in well defined text 00052 /// 00053 /// \return 00054 /// Returns parse tree root node 00055 /// 00056 FDO_API static FdoExpression* Parse(FdoString* expressionText); 00057 00058 /// \brief 00059 /// Abstract operation that takes an FdoIExpressionProcessor as an argument. 00060 /// Concrete expression subclasses must override this method and pass 00061 /// themselves as an argument to the appropriate expression processor 00062 /// operation. 00063 /// 00064 /// \param p 00065 /// Input expression processor 00066 /// 00067 /// \return 00068 /// Returns nothing 00069 /// 00070 FDO_API virtual void Process(FdoIExpressionProcessor* p) = 0; 00071 00072 /// \brief 00073 /// Abstract operation that returns the well defined text representation of 00074 /// this expression. 00075 /// 00076 /// \return 00077 /// Returns the well defined text string 00078 /// 00079 FDO_API virtual FdoString* ToString() = 0; 00080 00081 /// \brief 00082 /// This is an internal method. It returns the well defined text representation of the expression. 00083 /// 00084 /// \param pIdCol 00085 /// A identifier collection that contains all the computed identifier used by the filter 00086 /// 00087 /// \return 00088 /// Returns the well defined text string 00089 /// 00090 virtual FdoString* ToStringInternal( FdoIdentifierCollection *pIdCol ); 00091 00092 protected: 00093 wchar_t* m_toString; 00094 }; 00095 #endif 00096 00097
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