private ICriterion GetCollectionContainsCriteria(CollectionAccessExpression arg, Expression containsExpression)
{
EntityExpression rootEntity = EntityExpressionVisitor.FirstEntity(arg);
var rootEntityType = rootEntity.Type;
if (rootEntity.MetaData.HasProxy)
{
rootEntityType = rootEntity.MetaData.GetMappedClass(EntityMode.Poco);
}
DetachedCriteria query = DetachedCriteria.For(rootEntityType)
.SetProjection(Projections.Id());
var visitor = new MemberNameVisitor(query.Adapt(session), true);
visitor.Visit(arg);
//TODO: this won't work for collections of values
var containedEntity = QueryUtil.GetExpressionValue(containsExpression);
var collectionIdPropertyName = visitor.MemberName + "." + arg.ElementExpression.MetaData.IdentifierPropertyName;
var idValue = arg.ElementExpression.MetaData.GetIdentifier(containedEntity, EntityMode.Poco);
query.Add(Restrictions.Eq(collectionIdPropertyName, idValue));
string identifierName = rootEntity.MetaData.IdentifierPropertyName;
return(Subqueries.PropertyIn(identifierName, query));
}
private ICriterion GetExistsCriteria(MethodCallExpression expr)
{
EntityExpression rootEntity = EntityExpressionVisitor.FirstEntity(expr);
string propertyName = MemberNameVisitor.GetMemberName(rootCriteria, expr);
var rootEntityType = rootEntity.Type;
if (rootEntity.MetaData.HasProxy)
{
rootEntityType = rootEntity.MetaData.GetMappedClass(EntityMode.Poco);
}
DetachedCriteria query = DetachedCriteria.For(rootEntityType)
.SetProjection(Projections.Id())
.Add(Restrictions.IsNotEmpty(propertyName));
if (expr.Arguments.Count > 1)
{
var arg = (LambdaExpression)LinqUtil.StripQuotes(expr.Arguments[1]);
string alias = arg.Parameters[0].Name;
DetachedCriteria subquery = query.CreateCriteria(propertyName, alias);
var temp = new WhereArgumentsVisitor(subquery.Adapt(session), session);
temp.Visit(arg.Body);
foreach (ICriterion c in temp.CurrentCriterions)
{
subquery.Add(c);
}
}
string identifierName = rootEntity.GetAliasedIdentifierPropertyName();
return(Subqueries.PropertyIn(identifierName, query));
}