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/* Copyright (C) 2003 MySQL AB
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
#ifndef ODBC_CODEGEN_Code_expr_const_hpp
#define ODBC_CODEGEN_Code_expr_const_hpp
#include <common/common.hpp>
#include <common/DataField.hpp>
#include "Code_expr.hpp"
/**
* @class Plan_expr_const
* @brief Constant expression value in PlanTree
*/
class Plan_expr_const : public Plan_expr {
public:
Plan_expr_const(Plan_root* root, LexType lexType, const char* value);
virtual ~Plan_expr_const();
Plan_base* analyze(Ctx& ctx, Ctl& ctl);
Exec_base* codegen(Ctx& ctx, Ctl& ctl);
void print(Ctx& ctx);
bool isEqual(const Plan_expr* expr) const;
bool isGroupBy(const Plan_expr_row* row) const;
protected:
// lexical type and token set by the parser
LexType m_lexType;
BaseString m_string;
};
inline
Plan_expr_const::Plan_expr_const(Plan_root* root, LexType lexType, const char* value) :
Plan_expr(root, TypeConst),
m_lexType(lexType),
m_string(value)
{
}
/**
* @class Exec_expr_const
* @brief Constant expression value in ExecTree
*/
class Exec_expr_const : public Exec_expr {
public:
class Code : public Exec_expr::Code {
public:
Code(const SqlField& sqlField);
virtual ~Code();
protected:
friend class Exec_expr_const;
const SqlField m_sqlField;
};
class Data : public Exec_expr::Data {
public:
Data(SqlField& sqlField);
virtual ~Data();
protected:
friend class Exec_expr_const;
SqlField m_sqlField;
};
Exec_expr_const(Exec_root* root);
virtual ~Exec_expr_const();
void alloc(Ctx& ctx, Ctl& ctl);
void evaluate(Ctx& ctx, Ctl& ctl);
void close(Ctx& ctx);
void print(Ctx& ctx);
// children
const Code& getCode() const;
Data& getData() const;
};
inline
Exec_expr_const::Code::Code(const SqlField& sqlField) :
Exec_expr::Code(m_sqlField.sqlSpec()),
m_sqlField(sqlField)
{
}
inline
Exec_expr_const::Data::Data(SqlField& sqlField) :
Exec_expr::Data(m_sqlField),
m_sqlField(sqlField)
{
}
inline
Exec_expr_const::Exec_expr_const(Exec_root* root) :
Exec_expr(root)
{
}
// children
inline const Exec_expr_const::Code&
Exec_expr_const::getCode() const
{
const Code* code = static_cast<const Code*>(m_code);
return *code;
}
inline Exec_expr_const::Data&
Exec_expr_const::getData() const
{
Data* data = static_cast<Data*>(m_data);
return *data;
}
#endif
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