private Condition <T> AddClause(ClauseElement clause)
{
Condition <T> parent = stack.Peek();
if (parent.GetType() == typeof(ListCondition <T>))
{
ListCondition <T> list = (ListCondition <T>)parent;
if (list.IsClosed())
{
throw new QueryException(String.Format("Invalid Stack State: List condition is already closed. [type={0}]", list.GetType().FullName));
}
if (clause.GetType() != typeof(ClauseValue))
{
throw new QueryException(String.Format("Invalid Clause: Expected Value clause. [type={0}]", clause.GetType().FullName));
}
list.AddValue((ClauseValue)clause);
return(list);
}
else if (parent.GetType() == typeof(BasicCondition <T>))
{
BasicCondition <T> condition = (BasicCondition <T>)parent;
if (condition.IsClosed())
{
throw new QueryException(String.Format("Invalid Stack State: List condition is already closed. [type={0}]", condition.GetType().FullName));
}
if (condition.LeftElement == null)
{
condition.LeftElement = clause;
}
else
{
condition.RightElement = clause;
}
return(condition);
}
throw new QueryException(String.Format("Invalid Stack State: Cannot add clause. [type={0}]", parent.GetType().FullName));
}
public Condition <T> Operation(ClauseElement clause)
{
Contract.Requires(clause != null);
return(AddClause(clause));
}