bool ClassInstanceData::change_rel(ToolCom * com, const char * args,
bool isadd)
{
com->get_unsigned(args); // 2
BrowserRelation * r = (BrowserRelation *) com->get_id(args);
BrowserClassInstance * other = (BrowserClassInstance *) com->get_id(args);
if (r->deletedp() || other->deletedp()) {
com->write_ack(FALSE);
return FALSE;
}
RelationData * rd = (RelationData *) r->get_data();
Q3ValueList<SlotRel>::Iterator it;
for (it = relations.begin(); it != relations.end(); ++it) {
const SlotRel & slot_rel = *it;
if ((slot_rel.value == other) &&
(r == ((slot_rel.is_a) ? rd->get_start() : rd->get_end())))
break;
}
if (isadd) {
if (it == relations.end()) {
// not yet present
QList<BrowserRelation *> l;
cl->get_rels(((ClassInstanceData *)other->get_data())->cl, l);
if ((! l.contains(r)) ||
(!other->is_writable() && !root_permission())) {
// illegal
com->write_ack(FALSE);
return FALSE;
}
// add it
if (rd->is_a(r))
add(other, rd);
else
((ClassInstanceData *)other->get_data())
->add((BrowserClassInstance *) browser_node, rd);
}
}
else if (it != relations.end()) {
// remove it
if (!other->is_writable() && !root_permission()) {
// illegal
com->write_ack(FALSE);
return FALSE;
}
replace(other, rd, 0, (*it).is_a, 0);
}
return TRUE;
}
