Clause.h

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00001 
00002 // -*- mode: c++; c-basic-offset:4 -*-
00003 
00004 // This file is part of libdap, A C++ implementation of the OPeNDAP Data
00005 // Access Protocol.
00006 
00007 // Copyright (c) 2002,2003 OPeNDAP, Inc.
00008 // Author: James Gallagher <jgallagher@opendap.org>
00009 //
00010 // This library is free software; you can redistribute it and/or
00011 // modify it under the terms of the GNU Lesser General Public
00012 // License as published by the Free Software Foundation; either
00013 // version 2.1 of the License, or (at your option) any later version.
00014 //
00015 // This library is distributed in the hope that it will be useful,
00016 // but WITHOUT ANY WARRANTY; without even the implied warranty of
00017 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00018 // Lesser General Public License for more details.
00019 //
00020 // You should have received a copy of the GNU Lesser General Public
00021 // License along with this library; if not, write to the Free Software
00022 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
00023 //
00024 // You can contact OPeNDAP, Inc. at PO Box 112, Saunderstown, RI. 02874-0112.
00025 
00026 // (c) COPYRIGHT URI/MIT 1995-1999
00027 // Please first read the full copyright statement in the file COPYRIGHT_URI.
00028 //
00029 // Authors:
00030 // jhrg,jimg James Gallagher <jgallagher@gso.uri.edu>
00031 
00032 // Interface for the CE Clause class.
00033 
00034 #ifndef _clause_h
00035 #define _clause_h
00036 
00037 
00038 #ifndef _expr_h
00039 #include "expr.h"
00040 #endif
00041 
00042 #ifndef _rvalue_h
00043 #include "RValue.h"
00044 #endif
00045 
00046 namespace libdap
00047 {
00048 
00090 struct Clause
00091 {
00092 
00093 private:
00095     int _op;
00097     bool_func _b_func;
00100     btp_func _bt_func;
00101 
00102     int _argc;   // arg count
00103     rvalue *_arg1;  // only for operator
00104     rvalue_list *_args;  // vector arg
00105 
00106     Clause(const Clause &)
00107     {}
00108     Clause &operator=(const Clause &)
00109     {
00110         throw InternalErr(__FILE__, __LINE__, "Unimplemented method");
00111     }
00112 
00113 public:
00114     Clause(const int oper, rvalue *a1, rvalue_list *rv);
00115     Clause(bool_func func, rvalue_list *rv);
00116     Clause(btp_func func, rvalue_list *rv);
00117     Clause();
00118 
00119     virtual ~Clause();
00120 
00121     bool OK();
00122 
00123     bool boolean_clause();
00124 
00125     bool value_clause();
00126 
00127     bool value(const string &dataset, DDS &dds);
00128 
00129     bool value(const string &dataset, DDS &dds, BaseType **value);
00130 };
00131 
00132 } // namespace libdap
00133 
00134 #endif // _clause_h

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