---

comp_hook.h

Go to the documentation of this file.

// Search Node computation hook implementation -*- C++ -*-

// Copyright (C) 2003 Hermann Schichl
//
// This file is part of the COCONUT API.  This library
// is free software; you can redistribute it and/or modify it under the
// terms of the Library GNU General Public License as published by the
// Free Software Foundation; either version 2, 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
// Library GNU General Public License for more details.

// As a special exception, you may use this file as part of a free software
// library without restriction.  Specifically, if other files instantiate
// templates or use macros or inline functions from this file, or you compile
// this file and link it with other files to produce an executable, this
// file does not by itself cause the resulting executable to be covered by
// the Library GNU General Public License.  This exception does not however
// invalidate any other reasons why the executable file might be covered by
// the Library GNU General Public License.

#ifndef _COMP_HOOK_H
#define _COMP_HOOK_H

#include <dbtools.h>
#include <search_node.h>

class work_node_comp_hook
{
private:
  std::string __name;
  std::list<std::string> __managed_cols;

protected:
  template <class _CI>
  bool _init_column(vdbl::standard_table& stable, const std::string& colname,
                    const _CI& c);

  template <class _CI>
  bool _init_column(vdbl::standard_table& stable, const char* colname,
                    const _CI& c)
        { return _init_column(stable, std::string(colname), c); }

  bool _drop_columns(vdbl::standard_table& stable);

// accessors to the work_node class
  search_node_relation parent_relation(const work_node& wn) const;

  search_node_id node_id(const work_node& wn) const;

public:
  work_node_comp_hook(const std::string& name) : __name(name), __managed_cols()
        {}

  virtual ~work_node_comp_hook() {}

  virtual void operator()(const work_node& wn, dbt_row& dbr) = 0;

  virtual bool init_columns(vdbl::standard_table& stable) { return false; }

  virtual bool drop_columns(vdbl::standard_table& stable) { return false; }

  const std::string& name() { return __name; }
};

#endif // _COMP_HOOK_H

---