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/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
*
* Copyright (C) 2008 Sun Microsystems
*
* 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; version 2 of the License.
*
* 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef DRIZZLED_FUNCTION_CREATE_H
#define DRIZZLED_FUNCTION_CREATE_H
#include <drizzled/item.h>
#include <drizzled/sql_list.h>
#include <drizzled/item/bin_string.h>
#include <string>
#include <vector>
#include <functional>
class Function_builder
: public std::unary_function<MEM_ROOT*, Item_func *>
{
std::string name;
std::vector<std::string> aliases;
public:
Function_builder(std::string in_name) : name(in_name) {}
virtual result_type operator()(argument_type session) const= 0;
virtual ~Function_builder() {}
std::string getName() const
{
return name;
}
const std::vector<std::string>& getAliases() const
{
return aliases;
}
void addAlias(std::string alias)
{
aliases.push_back(alias);
}
};
template<class T>
class Create_function : public Function_builder
{
public:
typedef T Function_class;
Create_function(std::string in_name): Function_builder(in_name) {}
Create_function(const char *in_name): Function_builder(in_name) {}
virtual result_type operator()(argument_type root) const
{
return new (root) Function_class();
}
};
#endif /* DRIZZLED_FUNCTION_CREATE_H */
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