public virtual void AddDiscriminatorWhereFragment(IRestrictableStatement statement, IQueryable persister, IDictionary <string, IFilter> enabledFilters, string alias)
{
string whereFragment = persister.FilterFragment(alias, enabledFilters).Trim();
if (string.Empty.Equals(whereFragment))
{
return;
}
if (whereFragment.StartsWith("and", StringComparison.Ordinal))
{
whereFragment = whereFragment.Substring(4);
}
// Need to parse off the column qualifiers; this is assuming (which is true as of now)
// that this is only used from update and delete HQL statement parsing
whereFragment = StringHelper.Replace(whereFragment, persister.GenerateFilterConditionAlias(alias) + ".", "");
// Note: this simply constructs a "raw" SQL_TOKEN representing the
// where fragment and injects this into the tree. This "works";
// however it is probably not the best long-term solution.
//
// At some point we probably want to apply an additional grammar to
// properly tokenize this where fragment into constituent parts
// focused on the operators embedded within the fragment.
IASTNode discrimNode = Create(HqlSqlWalker.SQL_TOKEN, whereFragment);
if (statement.WhereClause.ChildCount == 0)
{
statement.WhereClause.SetFirstChild(discrimNode);
}
else
{
IASTNode and = Create(HqlSqlWalker.AND, "{and}");
IASTNode currentFirstChild = statement.WhereClause.GetFirstChild();
and.SetFirstChild(discrimNode);
and.AddChild(currentFirstChild);
statement.WhereClause.SetFirstChild(and);
}
}
