+IO::Seekable *Collection::open_from_sources(const string &name)
+{
+ for(SourceList::const_iterator i=sources.begin(); i!=sources.end(); ++i)
+ if(IO::Seekable *io = (*i)->open(name))
+ return io;
+
+ throw IO::file_not_found(name);
+}
+
+void Collection::gather_names_from_sources(list<string> &names, const CollectionItemTypeBase &type) const
+{
+ for(SourceList::const_iterator i=sources.begin(); i!=sources.end(); ++i)
+ {
+ std::list<std::string> available_names = (*i)->get_names(type);
+ for(std::list<std::string>::iterator j=available_names.begin(); j!=available_names.end(); ++j)
+ if(!items.count(*j))
+ names.push_back(*j);
+ }
+}
+
+void Collection::load_items_from_sources(const CollectionItemTypeBase &type)
+{
+ for(SourceList::const_iterator i=sources.begin(); i!=sources.end(); ++i)
+ {
+ std::list<std::string> available_names = (*i)->get_names(type);
+ for(std::list<std::string>::iterator j=available_names.begin(); j!=available_names.end(); ++j)
+ if(!items.count(*j))
+ (*i)->load(*this, type, *j);
+ }
+}
+
+void Collection::set_fallback(Collection *f)
+{
+ fallback = f;
+}
+