| 1 | /*************************************************************************** |
| 2 | * Copyright (C) 2006 by Gerd v. Egidy * |
| 3 | * gve@intra2net.com * |
| 4 | * * |
| 5 | * This library is free software; you can redistribute it and/or modify * |
| 6 | * it under the terms of the GNU Lesser General Public License version * |
| 7 | * 2.1 as published by the Free Software Foundation. * |
| 8 | * * |
| 9 | * This library is distributed in the hope that it will be useful, * |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of * |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * |
| 12 | * GNU Lesser General Public License for more details. * |
| 13 | * * |
| 14 | * You should have received a copy of the GNU Lesser General Public * |
| 15 | * License along with this program; if not, write to the * |
| 16 | * Free Software Foundation, Inc., * |
| 17 | * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. * |
| 18 | ***************************************************************************/ |
| 19 | #ifndef __LIBT2N_CONTAINER |
| 20 | #define __LIBT2N_CONTAINER |
| 21 | |
| 22 | #include "command.hxx" |
| 23 | #include "t2n_exception.hxx" |
| 24 | |
| 25 | namespace libt2n |
| 26 | { |
| 27 | |
| 28 | /** @brief contains the result (return value or exception) of a executed command |
| 29 | */ |
| 30 | class result_container |
| 31 | { |
| 32 | private: |
| 33 | enum result_type_t { regular, exception } result_type; |
| 34 | |
| 35 | result *res; |
| 36 | t2n_exception *ex; |
| 37 | |
| 38 | friend class boost::serialization::access; |
| 39 | // When the class Archive corresponds to an output archive, the |
| 40 | // & operator is defined similar to <<. Likewise, when the class Archive |
| 41 | // is a type of input archive the & operator is defined similar to >>. |
| 42 | template<class Archive> |
| 43 | void serialize(Archive & ar, const unsigned int version) |
| 44 | { |
| 45 | ar & BOOST_SERIALIZATION_NVP(result_type); |
| 46 | ar & BOOST_SERIALIZATION_NVP(res); |
| 47 | ar & BOOST_SERIALIZATION_NVP(ex); |
| 48 | } |
| 49 | |
| 50 | public: |
| 51 | result_container() |
| 52 | { res=0; ex=0; } |
| 53 | |
| 54 | result_container(result *_res) |
| 55 | { set_result(_res); } |
| 56 | result_container(t2n_exception *_ex) |
| 57 | { set_exception(_ex); } |
| 58 | |
| 59 | void set_result(result *_res) |
| 60 | { res=_res; ex=0; result_type=regular; } |
| 61 | void set_exception(t2n_exception *_ex) |
| 62 | { res=0; ex=_ex; result_type=exception; } |
| 63 | |
| 64 | /** @brief returns the result or throw the carried exception. |
| 65 | ATTENTION: the result object is deleted in the destructor |
| 66 | */ |
| 67 | result* get_result(void) |
| 68 | { |
| 69 | if (result_type==exception) |
| 70 | ex->do_throw(); |
| 71 | return res; |
| 72 | } |
| 73 | |
| 74 | /// deletes the carried result or exception objects |
| 75 | ~result_container() |
| 76 | { |
| 77 | if (res) |
| 78 | delete res; |
| 79 | if (ex) |
| 80 | delete ex; |
| 81 | } |
| 82 | }; |
| 83 | |
| 84 | /** @brief contains a command |
| 85 | */ |
| 86 | class command_container |
| 87 | { |
| 88 | private: |
| 89 | command *cmd; |
| 90 | |
| 91 | friend class boost::serialization::access; |
| 92 | template<class Archive> |
| 93 | void serialize(Archive & ar, const unsigned int version) |
| 94 | { |
| 95 | ar & BOOST_SERIALIZATION_NVP(cmd); |
| 96 | } |
| 97 | |
| 98 | public: |
| 99 | command_container() |
| 100 | { cmd=0; } |
| 101 | command_container(command *_cmd) |
| 102 | { cmd=_cmd; } |
| 103 | |
| 104 | /// return the contained command |
| 105 | command* get_command() |
| 106 | { return cmd; } |
| 107 | |
| 108 | ~command_container() |
| 109 | { |
| 110 | if (cmd) |
| 111 | delete cmd; |
| 112 | } |
| 113 | }; |
| 114 | |
| 115 | } // namespace libt2n |
| 116 | |
| 117 | BOOST_CLASS_TRACKING(libt2n::result_container, boost::serialization::track_never) |
| 118 | BOOST_CLASS_TRACKING(libt2n::command_container, boost::serialization::track_never) |
| 119 | |
| 120 | #endif |
| 121 | |