diff options
Diffstat (limited to 'storage/mroonga/lib/mrn_table_fields_offset_mover.cpp')
-rw-r--r-- | storage/mroonga/lib/mrn_table_fields_offset_mover.cpp | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/storage/mroonga/lib/mrn_table_fields_offset_mover.cpp b/storage/mroonga/lib/mrn_table_fields_offset_mover.cpp new file mode 100644 index 00000000..bc2d2f25 --- /dev/null +++ b/storage/mroonga/lib/mrn_table_fields_offset_mover.cpp @@ -0,0 +1,47 @@ +/* -*- c-basic-offset: 2 -*- */ +/* + Copyright(C) 2017 Kouhei Sutou <kou@clear-code.com> + + This library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, 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 GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with this library; if not, write to the Free Software + Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA +*/ + +#include "mrn_table_fields_offset_mover.hpp" + +namespace mrn { + FieldTableChanger::FieldTableChanger(TABLE *table, + TABLE *new_table) + : old_table_(table), + new_table_(new_table) { + my_ptrdiff_t diff = + PTR_BYTE_DIFF(new_table_->record[0], old_table_->record[0]); + uint n_columns = old_table_->s->fields; + for (uint i = 0; i < n_columns; ++i) { + Field *field = old_table_->field[i]; + field->move_field_offset(diff); + field->table = new_table; + } + } + + FieldTableChanger::~FieldTableChanger() { + my_ptrdiff_t diff = + PTR_BYTE_DIFF(new_table_->record[0], old_table_->record[0]); + uint n_columns = old_table_->s->fields; + for (uint i = 0; i < n_columns; ++i) { + Field *field = old_table_->field[i]; + field->move_field_offset(-diff); + field->table = old_table_; + } + } +} |