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// -*- mode: c++; c-basic-offset:4 -*-
// This file is part of libdap, A C++ implementation of the OPeNDAP Data
// Access Protocol.
// Copyright (c) 2006 OPeNDAP, Inc.
// Author: James Gallagher <jgallagher@opendap.org>
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
//
// You can contact OPeNDAP, Inc. at PO Box 112, Saunderstown, RI. 02874-0112.
#ifndef constraint_evaluator_h
#define constraint_evaluator_h
#include <list>
#ifndef _dds_h
#include "DDS.h"
#endif
#ifndef _datadds_h
#include "DataDDS.h"
#endif
#ifndef _clause_h
#include "Clause.h"
#endif
namespace libdap
{
class ServerFunctionsList;
/** @brief Evaluate a constraint expression */
class ConstraintEvaluator
{
private:
#if 0
// This struct is used to hold all the known `user defined' functions
// (including those that are `built-in').
struct function
{
string name;
bool_func b_func;
btp_func bt_func;
proj_func p_func;
function(const string &n, const bool_func f)
: name(n), b_func(f), bt_func(0), p_func(0)
{}
function(const string &n, const btp_func f)
: name(n), bt_func(f), p_func(0)
{}
function(const string &n, const proj_func f)
: name(n), bt_func(0), p_func(f)
{}
function(): name(""), bt_func(0), p_func(0)
{}
};
#endif
vector<Clause *> expr; // List of CE Clauses
vector<BaseType *> constants;// List of temporary objects
#if 0
list<function> functions; // Known external functions
#endif
ServerFunctionsList *d_functions_list; // Know external functions from
// modules
// The default versions of these methods will break this class. Because
// Clause does not support deep copies, that class will need to be modified
// before these can be properly implemented. jhrg 4/3/06
ConstraintEvaluator(const ConstraintEvaluator &)
{}
ConstraintEvaluator &operator=(const ConstraintEvaluator &)
{
throw InternalErr(__FILE__, __LINE__, "Unimplemented method");
}
friend class func_name_is;
public:
typedef std::vector<Clause *>::const_iterator Clause_citer ;
typedef std::vector<Clause *>::iterator Clause_iter ;
typedef std::vector<BaseType *>::const_iterator Constants_citer ;
typedef std::vector<BaseType *>::iterator Constants_iter ;
#if 0
typedef std::list<function>::const_iterator Functions_citer ;
typedef std::list<function>::iterator Functions_iter ;
#endif
ConstraintEvaluator();
virtual ~ConstraintEvaluator();
#if 0
void add_function(const string &name, bool_func f);
void add_function(const string &name, btp_func f);
void add_function(const string &name, proj_func f);
#endif
bool find_function(const string &name, bool_func *f) const;
bool find_function(const string &name, btp_func *f) const;
bool find_function(const string &name, proj_func *f) const;
void append_clause(int op, rvalue *arg1, rvalue_list *arg2);
void append_clause(bool_func func, rvalue_list *args);
void append_clause(btp_func func, rvalue_list *args);
bool functional_expression();
bool boolean_expression();
bool eval_selection(DDS &dds, const string &dataset);
BaseType *eval_function(DDS &dds, const string &dataset);
// New for libdap 3.11. These methods provide a way to evaluate multiple
// functions in one CE
bool function_clauses();
DDS *eval_function_clauses(DDS &dds);
DataDDS *eval_function_clauses(DataDDS &dds);
Clause_iter clause_begin();
Clause_iter clause_end();
bool clause_value(Clause_iter &i, DDS &dds);
void parse_constraint(const string &constraint, DDS &dds);
void append_constant(BaseType *btp);
};
} // namespace libdap
#endif // constraint_evaluator_h
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