protected override ThingGraphContent OpenInternal(Iori source)
{
var gateway = new Limaki.Data.db4o.Gateway();
try {
gateway.Open(source);
var sink = new ThingGraphContent {
Data = new ThingGraph(gateway),
Source = source,
ContentType = Db4oThingGraphSpot.Db4oThingGraphContentType,
};
return(sink);
} catch (DatabaseFileLockedException ex) {
throw;
} catch (Exception ex) {
if (ex.InnerException != null && ex.InnerException is DatabaseFileLockedException)
{
throw ex.InnerException;
}
else
{
var olderVersion = ProveIfOlderVersion(gateway);
if (olderVersion != null)
{
throw new NotSupportedException(olderVersion, ex);
}
else
{
throw;
}
}
}
}
protected virtual string ProveIfOlderVersion(Limaki.Data.db4o.Gateway gateway)
{
var repairer = new Db4oRepairer();
var clazzes = repairer.ClazzNames(gateway);
var name = (from clazz in clazzes
from field in clazz.Item2
where field == "_writeDate"
select field).FirstOrDefault();
if (name != null)
{
return("Database seems created with an older version. Please import into a new database.");
}
return(null);
}
