Clause.h

// -*- 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 1995-1999
// Please first read the full copyright statement in the file COPYRIGHT_URI.
//
// Authors:
// jhrg,jimg James Gallagher <jgallagher@gso.uri.edu>

// Interface for the CE Clause class.

#ifndef _clause_h
#define _clause_h


#ifndef _expr_h
#include "expr.h"
#endif

#ifndef _rvalue_h
#include "RValue.h"
#endif

namespace libdap
{

struct Clause
{

private:
    int _op;
    bool_func _b_func;

    btp_func _bt_func;

    int _argc;   // arg count
    rvalue *_arg1;  // only for operator
    rvalue_list *_args;  // vector arg

    Clause(const Clause &);
    Clause &operator=(const Clause &);

public:
    Clause(const int oper, rvalue *a1, rvalue_list *rv);
    Clause(bool_func func, rvalue_list *rv);
    Clause(btp_func func, rvalue_list *rv);
    Clause();

    virtual ~Clause();

    bool OK();

    bool boolean_clause();

    bool value_clause();

    bool value(DDS &dds);

    bool value(DDS &dds, BaseType **value);
};

} // namespace libdap

#endif // _clause_h