ConstraintEvaluator.h
// -*- 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 <vector>
#include "RValue.h"
#include "expr.h"
namespace libdap {
class DDS;
class DataDDS;
struct Clause;
class ServerFunctionsList;
class ConstraintEvaluator {
private:
std::vector<Clause *> expr; // List of CE Clauses
std::vector<BaseType *> constants; // List of temporary objects
ServerFunctionsList *d_functions_list; // Known 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 &);
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;
ConstraintEvaluator();
virtual ~ConstraintEvaluator();
bool find_function(const std::string &name, bool_func *f) const;
bool find_function(const std::string &name, btp_func *f) const;
bool find_function(const std::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 std::string &dataset);
BaseType *eval_function(DDS &dds, const std::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 std::string &constraint, DDS &dds);
void append_constant(BaseType *btp);
};
} // namespace libdap
#endif // constraint_evaluator_h
libdap::BaseType
The basic data type for the DODS DAP types.
Definition BaseType.h:118
libdap::ConstraintEvaluator
Evaluate a constraint expression.
Definition ConstraintEvaluator.h:41
libdap::ConstraintEvaluator::boolean_expression
bool boolean_expression()
Does the current constraint expression return a boolean value?
Definition ConstraintEvaluator.cc:281
libdap::ConstraintEvaluator::eval_selection
bool eval_selection(DDS &dds, const std::string &dataset)
Evaluate a boolean-valued constraint expression. This is main method for the evaluator and is called ...
Definition ConstraintEvaluator.cc:300
libdap::ConstraintEvaluator::find_function
bool find_function(const std::string &name, bool_func *f) const
Find a Boolean function with a given name in the function list.
Definition ConstraintEvaluator.cc:150
libdap::ConstraintEvaluator::clause_value
bool clause_value(Clause_iter &i, DDS &dds)
Definition ConstraintEvaluator.cc:85
libdap::ConstraintEvaluator::parse_constraint
void parse_constraint(const std::string &constraint, DDS &dds)
Parse the constraint expression given the current DDS.
Definition ConstraintEvaluator.cc:333
libdap::ConstraintEvaluator::append_clause
void append_clause(int op, rvalue *arg1, rvalue_list *arg2)
Add a clause to a constraint expression.
Definition ConstraintEvaluator.cc:104
libdap::ConstraintEvaluator::clause_begin
Clause_iter clause_begin()
Definition ConstraintEvaluator.cc:77
libdap::ConstraintEvaluator::eval_function
BaseType * eval_function(DDS &dds, const std::string &dataset)
Evaluate a function-valued constraint expression.
Definition ConstraintEvaluator.cc:184
libdap::ConstraintEvaluator::function_clauses
bool function_clauses()
Does the current constraint expression contain function clauses.
Definition ConstraintEvaluator.cc:205
libdap::ConstraintEvaluator::eval_function_clauses
DDS * eval_function_clauses(DDS &dds)
Evaluate a function-valued constraint expression that contains several function calls.
Definition ConstraintEvaluator.cc:233
libdap::ConstraintEvaluator::append_constant
void append_constant(BaseType *btp)
Definition ConstraintEvaluator.cc:147
libdap::ConstraintEvaluator::clause_end
Clause_iter clause_end()
Definition ConstraintEvaluator.cc:81
libdap::ConstraintEvaluator::functional_expression
bool functional_expression()
Does the current constraint expression return a BaseType pointer? This method does not evaluate the c...
Definition ConstraintEvaluator.cc:173
libdap::DDS
Definition DDS.h:176
libdap::DataDDS
Holds a DAP2 DDS.
Definition DataDDS.h:76
libdap::ServerFunctionsList
Definition ServerFunctionsList.h:46
libdap::rvalue
Definition RValue.h:47
libdap
top level DAP object to house generic methods
Definition AlarmHandler.h:35