D4FilterClause.h

 
// -*- mode: c++; c-basic-offset:4 -*-
 
// This file is part of libdap, A C++ implementation of the OPeNDAP Data
// Access Protocol.
 
// Copyright (c) 2015 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 _d4_filter_clause_h
#define _d4_filter_clause_h
 
#include <cassert>
#include <vector>
 
#include "ce_expr.tab.hh"   // Use the same codes for D4 as we use in DAP2
 
namespace libdap
{
 
class D4Rvalue;
class D4FilterClause;
 
class D4FilterClauseList
{
private:
    std::vector<D4FilterClause *> d_clauses;
 
    void m_duplicate(const D4FilterClauseList &src);
 
public:
    typedef std::vector<D4FilterClause *>::iterator iter;
    typedef std::vector<D4FilterClause *>::const_iterator citer;
 
    D4FilterClauseList() { }
    D4FilterClauseList(const D4FilterClauseList &src) { m_duplicate(src); }
 
    D4FilterClauseList(D4FilterClause *c) { add_clause(c); }
 
    virtual ~D4FilterClauseList();
 
    D4FilterClauseList &operator=(const D4FilterClauseList &rhs) {
        if (this == &rhs)
            return *this;
 
        m_duplicate(rhs);
 
        return *this;
    }
 
    void add_clause(D4FilterClause *c) {
        d_clauses.push_back(c);
    }
 
    D4FilterClause *get_clause(unsigned int i) {
        return d_clauses.at(i);
    }
 
    citer cbegin() const { return d_clauses.begin(); }
    citer cend() const { return d_clauses.end(); }
 
    unsigned int size() const { return d_clauses.size(); }
 
    // get the clause value; this version supports functional clauses
    bool value(DMR &dmr);
 
    bool value();
};
 
class D4FilterClause
{
public:
    enum ops {
        // Stock relops
        null = 0,
        less = SCAN_LESS,
        greater = SCAN_GREATER,
        less_equal = SCAN_LESS_EQL,
        greater_equal = SCAN_GREATER_EQL,
        equal = SCAN_EQUAL,
        not_equal = SCAN_NOT_EQUAL,
        // Regex match for strings
        match = SCAN_REGEXP,
        // The mapping operator; not sure if this will be implemented
        map,
        // No Data 'operator' for array filtering; may not be impl'd
        ND
    };
 
private:
    ops d_op;
 
    D4RValue *d_arg1, *d_arg2;
 
    D4FilterClause() : d_op(null), d_arg1(0), d_arg2(0) { }
 
    void m_duplicate(const D4FilterClause &rhs);
 
    // These methods factor out first the first argument and then the
    // second. I could write one really large cmp() for all of this...
    //template<typename T> bool cmp(ops op, BaseType *arg1, T arg2);
    bool cmp(ops op, BaseType *arg1, BaseType *arg2);
 
    friend class D4FilterClauseList;
 
public:
    D4FilterClause(const ops op, D4RValue *arg1, D4RValue *arg2) :
        d_op(op), d_arg1(arg1), d_arg2(arg2) {
        assert(op != null && "null operator");
        assert(arg1 && "null arg1");
        assert(arg2 && "null arg2");
    }
 
    D4FilterClause(const D4FilterClause &src) {
        m_duplicate(src);
    }
 
    D4FilterClause &operator=(const D4FilterClause &rhs) {
        if (this == &rhs)
            return *this;
 
        m_duplicate(rhs);
 
        return *this;
    }
 
    virtual ~D4FilterClause() {
        delete d_arg1;
        delete d_arg2;
    }
 
    // get the clause value; this version supports functional clauses
    bool value(DMR &dmr);
 
    bool value();
};
 
} // namespace libdap
 
#endif // _clause_h