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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, Inc.
*
* 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_PLUGIN_FUNCTION_H
#define DRIZZLED_PLUGIN_FUNCTION_H
#include <drizzled/item/func.h>
#include <drizzled/plugin.h>
#include <drizzled/plugin/plugin.h>
#include <string>
#include <vector>
#include <functional>
#include <boost/unordered_map.hpp>
#include <drizzled/visibility.h>
namespace drizzled
{
class Item_func;
namespace memory
{
class Root;
}
namespace util
{
struct insensitive_hash;
struct insensitive_equal_to;
}
namespace plugin
{
/**
* Functions in the server: AKA UDF
*/
class DRIZZLED_API Function
: public Plugin,
public std::unary_function<memory::Root*, Item_func *>
{
Function();
Function(const Function &);
Function& operator=(const Function &);
public:
Function(std::string in_name)
: Plugin(in_name, "Function"),
std::unary_function<memory::Root*, Item_func *>()
{ }
virtual result_type operator()(argument_type root) const= 0;
virtual ~Function() {}
/**
* Add a new Function factory to the list of factories we manage.
*/
static bool addPlugin(const plugin::Function *function_obj);
/**
* Remove a Function factory from the list of factory we manage.
*/
static void removePlugin(const plugin::Function *function_obj);
static const plugin::Function *get(const char *name, size_t len=0);
typedef boost::unordered_map<std::string, const plugin::Function *, util::insensitive_hash, util::insensitive_equal_to> UdfMap;
typedef boost::unordered_map<std::string, const plugin::Function *, util::insensitive_hash, util::insensitive_equal_to> Map;
static const UdfMap &getMap();
};
template<class T>
class Create_function
: public Function
{
public:
typedef T FunctionClass;
Create_function(std::string in_name)
: Function(in_name)
{ }
virtual result_type operator()(argument_type root) const
{
return new (root) FunctionClass();
}
};
} /* namespace plugin */
} /* namespace drizzled */
#endif /* DRIZZLED_PLUGIN_FUNCTION_H */
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