libdap Updated for version 3.20.11
libdap4 is an implementation of OPeNDAP's DAP protocol.
Clause.h
1
2// -*- mode: c++; c-basic-offset:4 -*-
3
4// This file is part of libdap, A C++ implementation of the OPeNDAP Data
5// Access Protocol.
6
7// Copyright (c) 2002,2003 OPeNDAP, Inc.
8// Author: James Gallagher <jgallagher@opendap.org>
9//
10// This library is free software; you can redistribute it and/or
11// modify it under the terms of the GNU Lesser General Public
12// License as published by the Free Software Foundation; either
13// version 2.1 of the License, or (at your option) any later version.
14//
15// This library is distributed in the hope that it will be useful,
16// but WITHOUT ANY WARRANTY; without even the implied warranty of
17// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18// Lesser General Public License for more details.
19//
20// You should have received a copy of the GNU Lesser General Public
21// License along with this library; if not, write to the Free Software
22// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23//
24// You can contact OPeNDAP, Inc. at PO Box 112, Saunderstown, RI. 02874-0112.
25
26// (c) COPYRIGHT URI/MIT 1995-1999
27// Please first read the full copyright statement in the file COPYRIGHT_URI.
28//
29// Authors:
30// jhrg,jimg James Gallagher <jgallagher@gso.uri.edu>
31
32// Interface for the CE Clause class.
33
34#ifndef _clause_h
35#define _clause_h
36
37
38#ifndef _expr_h
39#include "expr.h"
40#endif
41
42#ifndef _rvalue_h
43#include "RValue.h"
44#endif
45
46namespace libdap
47{
48
90struct Clause
91{
92
93private:
95 int _op;
97 bool_func _b_func;
98
101 btp_func _bt_func;
102
103 int _argc; // arg count
104 rvalue *_arg1; // only for operator
105 rvalue_list *_args; // vector arg
106
107 Clause(const Clause &);
108 Clause &operator=(const Clause &);
109
110public:
111 Clause(const int oper, rvalue *a1, rvalue_list *rv);
112 Clause(bool_func func, rvalue_list *rv);
113 Clause(btp_func func, rvalue_list *rv);
114 Clause();
115
116 virtual ~Clause();
117
118 bool OK();
119
120 bool boolean_clause();
121
122 bool value_clause();
123
124 bool value(DDS &dds);
125
126 bool value(DDS &dds, BaseType **value);
127};
128
129} // namespace libdap
130
131#endif // _clause_h
The basic data type for the DODS DAP types.
Definition: BaseType.h:118
top level DAP object to house generic methods
Definition: AlarmHandler.h:36
Holds a fragment of a constraint expression.
Definition: Clause.h:91
bool value_clause()
Return true if the clause returns a value in a BaseType pointer.
Definition: Clause.cc:138
bool boolean_clause()
Return true if the clause returns a boolean value.
Definition: Clause.cc:129
bool value(DDS &dds)
Evaluate a clause which returns a boolean value This method must only be evaluated for clauses with r...
Definition: Clause.cc:156
bool OK()
Checks the "representation invariant" of a clause.
Definition: Clause.cc:106