/// <summary>
/// Convert a lambda expression to NHibernate subquery AbstractCriterion
/// </summary>
/// <param name="subqueryType">type of subquery</param>
/// <param name="expression">lambda expression to convert</param>
/// <returns>NHibernate.ICriterion.AbstractCriterion</returns>
public static AbstractCriterion ProcessSubquery(LambdaSubqueryType subqueryType,
Expression <Func <bool> > expression)
{
BinaryExpression be = (BinaryExpression)expression.Body;
AbstractCriterion criterion = ProcessSubqueryExpression(subqueryType, be);
return(criterion);
}
private static AbstractCriterion ProcessSubqueryExpression(LambdaSubqueryType subqueryType,
BinaryExpression be)
{
string property = FindMemberExpression(be.Left);
DetachedCriteria detachedCriteria = FindDetachedCriteria(be.Right);
var subqueryExpressionCreators = _subqueryExpressionCreatorTypes[subqueryType];
Func <string, DetachedCriteria, AbstractCriterion> subqueryExpressionCreator;
if (!subqueryExpressionCreators.TryGetValue(be.NodeType, out subqueryExpressionCreator))
{
throw new InvalidOperationException("Unhandled subquery expression type: " + subqueryType + "," + be.NodeType);
}
return(subqueryExpressionCreator(property, detachedCriteria));
}
private static AbstractCriterion ProcessSubqueryExpression(LambdaSubqueryType subqueryType,
BinaryExpression be)
{
string property = FindMemberExpression(be.Left);
DetachedCriteria detachedCriteria = FindDetachedCriteria(be.Right);
var subqueryExpressionCreators = _subqueryExpressionCreatorTypes[subqueryType];
if (!subqueryExpressionCreators.ContainsKey(be.NodeType))
{
throw new Exception("Unhandled subquery expression type: " + subqueryType + "," + be.NodeType);
}
Func <string, DetachedCriteria, AbstractCriterion> subqueryExpressionCreator = subqueryExpressionCreators[be.NodeType];
return(subqueryExpressionCreator(property, detachedCriteria));
}
