GSEClause.h

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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) 2002,2003 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.
 
// (c) COPYRIGHT URI/MIT 1999
// Please read the full copyright statement in the file COPYRIGHT_URI.
//
// Authors:
//      jhrg,jimg       James Gallagher <jgallagher@gso.uri.edu>
 
// The Grid Selection Expression Clause class.
 
#ifndef _gseclause_h
#define _gseclause_h 1
 
#include <sstream>
#include <string>
 
#if 0
#include <Array.h>
#include <BaseType.h>
#include <Grid.h>
#endif
 
namespace libdap {
class BaseType;
class Array;
class Grid;
} // namespace libdap
 
namespace functions {
 
enum relop {
    dods_nop_op,
    dods_greater_op,
    dods_greater_equal_op,
    dods_less_op,
    dods_less_equal_op,
    dods_equal_op,
    dods_not_equal_op
};

 
class GSEClause {
private:
    libdap::Array *d_map;
    // _value1, 2 and _op1, 2 hold the first and second operators and
    // operands. For a clause like `var op value' only _op1 and _value1 have
    // valid information. For a clause like `value op var op value' the
    // second operator and operand are on _op2 and _value2. 1/19/99 jhrg
    double d_value1, d_value2;
    relop d_op1, d_op2;
    int d_start;
    int d_stop;
 
    string d_map_min_value, d_map_max_value;
 
    GSEClause(); // Hidden default constructor.
 
    GSEClause(const GSEClause &param);    // Hide
    GSEClause &operator=(GSEClause &rhs); // Hide
 
    template <class T> void set_start_stop();
    template <class T> void set_map_min_max_value(T min, T max);
 
    void compute_indices();
 
public:
    GSEClause(libdap::Grid *grid, const string &map, const double value, const relop op);
 
    GSEClause(libdap::Grid *grid, const string &map, const double value1, const relop op1, const double value2,
              const relop op2);
 
    virtual ~GSEClause();
 
    bool OK() const;

    libdap::Array *get_map() const;
 
    string get_map_name() const;
 
    int get_start() const;
 
    int get_stop() const;
 
    string get_map_min_value() const;
 
    string get_map_max_value() const;

    void set_map(libdap::Array *map);
 
    void set_start(int start);
 
    void set_stop(int stop);
};
 
} // namespace functions
 
#endif // _gseclause_h