00001 // Search Node logvolume computation hook implementation -*- C++ -*- 00002 00003 // Copyright (C) 2003 Hermann Schichl 00004 // 00005 // This file is part of the COCONUT API. This library 00006 // is free software; you can redistribute it and/or modify it under the 00007 // terms of the Library GNU General Public License as published by the 00008 // Free Software Foundation; either version 2, or (at your option) 00009 // any later version. 00010 00011 // This library is distributed in the hope that it will be useful, 00012 // but WITHOUT ANY WARRANTY; without even the implied warranty of 00013 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00014 // Library GNU General Public License for more details. 00015 00016 // As a special exception, you may use this file as part of a free software 00017 // library without restriction. Specifically, if other files instantiate 00018 // templates or use macros or inline functions from this file, or you compile 00019 // this file and link it with other files to produce an executable, this 00020 // file does not by itself cause the resulting executable to be covered by 00021 // the Library GNU General Public License. This exception does not however 00022 // invalidate any other reasons why the executable file might be covered by 00023 // the Library GNU General Public License. 00024 00027 #ifndef _LOGVOL_HOOK_H 00028 #define _LOGVOL_HOOK_H 00029 00030 #include <comp_hook.h> 00031 00032 class logvol_comp_hook : protected work_node_comp_hook 00033 { 00034 public: 00035 logvol_comp_hook() : __name(name), __managed_cols(); 00036 00037 virtual ~logvol_comp_hook() {} 00038 00039 void operator()(const work_node& wn, dbt_row& dbr) 00040 { 00041 add_to_dbt_row(dbr, "logvol", wn.log_volume()); 00042 } 00043 00044 bool init_columns(vdbl::standard_table& stable) 00045 { return _init_column(stable, "logvol", INFINITY); } 00046 00047 bool drop_columns(vdbl::standard_table& stable) 00048 { return _drop_columns(stable); } 00049 }; 00050 00051 #endif // _LOGVOL_HOOK_H