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/*
* Copyright (c) 2007, 2014, Oracle and/or its affiliates. All rights reserved.
*
* 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
*/
#include <grts/structs.db.h>
#include <grtpp_util.h>
#include <grtpp_undo_manager.h>
//================================================================================
// db_ForeignKey
// don't hold reference to the fk!
static std::map<grt::internal::Value*, std::set<db_ForeignKey*> > referenced_table_to_fk;
void db_ForeignKey::init()
{
}
void delete_foreign_key_mapping(const db_TableRef &table, db_ForeignKey *fk)
{
if (table.is_valid())
{
grt::internal::Value *t= table.valueptr();
std::map<grt::internal::Value*, std::set<db_ForeignKey*> >::iterator iter= referenced_table_to_fk.find(t);
if (iter != referenced_table_to_fk.end())
{
if (iter->second.find(fk) != iter->second.end())
iter->second.erase(iter->second.find(fk));
// if no more FKs to this table, remove the entry
if (iter->second.empty())
referenced_table_to_fk.erase(iter);
}
}
}
void add_foreign_key_mapping(const db_TableRef &table, db_ForeignKey *fk)
{
if (table.is_valid())
{
std::set<db_ForeignKey*> list;
std::map<grt::internal::Value*, std::set<db_ForeignKey*> >::iterator iter;
if ((iter= referenced_table_to_fk.find(table.valueptr())) != referenced_table_to_fk.end())
{
iter->second.insert(fk);
}
else
{
list.insert(fk);
referenced_table_to_fk[table.valueptr()]= list;
}
}
}
db_ForeignKey::~db_ForeignKey()
{
if (_referencedTable.is_valid())
delete_foreign_key_mapping(_referencedTable, this);
}
grt::ListRef<db_ForeignKey> get_foreign_keys_referencing_table(const db_TableRef &value)
{
std::map<grt::internal::Value*, std::set<db_ForeignKey*> >::const_iterator iter;
grt::ListRef<db_ForeignKey> result(value.get_grt());
if ((iter= referenced_table_to_fk.find(value.valueptr())) != referenced_table_to_fk.end())
{
for (std::set<db_ForeignKey*>::const_iterator fk= iter->second.begin();
fk != iter->second.end(); ++fk)
{
result.insert(db_ForeignKeyRef(*fk));
}
}
return result;
}
void db_ForeignKey::referencedTable(const db_TableRef &value)
{
grt::ValueRef ovalue(_referencedTable);
// remove old referenced table from backreference map
delete_foreign_key_mapping(_referencedTable, this);
_referencedTable= value;
// add new referenced table to backreference map
add_foreign_key_mapping(value, this);
member_changed("referencedTable", ovalue, value);
if (_owner.is_valid())
(*owner()->signal_foreignKeyChanged())(this);
}
void db_ForeignKey::owner(const db_TableRef &value)
{
super::owner(value);
if (value.is_valid())
(*value->signal_foreignKeyChanged())(this);
}
void db_ForeignKey::owned_list_item_added(grt::internal::OwnedList *list, const grt::ValueRef &value)
{
super::owned_list_item_added(list, value);
if (_owner.is_valid())
(*owner()->signal_foreignKeyChanged())(this);
}
void db_ForeignKey::owned_list_item_removed(grt::internal::OwnedList *list, const grt::ValueRef &value)
{
super::owned_list_item_removed(list, value);
if (_owner.is_valid())
(*owner()->signal_foreignKeyChanged())(this);
}
/** Performs basic validation of the foreign key
*/
grt::IntegerRef db_ForeignKey::checkCompleteness()
{
if (!_owner.is_valid() || !_referencedTable.is_valid())
return 0;
// If we are currently undoing then don't check completeness either.
grt::UndoManager *um= get_grt()->get_undo_manager();
if (um != NULL && um->is_undoing())
return 0;
if (db_TableRef::cast_from(_owner)->foreignKeys().get_index(db_ForeignKeyRef(this)) == grt::BaseListRef::npos)
return 0;
if (_columns.count() != _referencedColumns.count())
return 0;
for (size_t i= 0, c= _columns.count(); i < c; i++)
{
if (!_columns[i].is_valid() || !_referencedColumns[i].is_valid())
return 0;
}
return 1;
}
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