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 EntityExpression GetParentExpression(MemberExpression expr, out string memberName, out IType nhibernateType)
{
memberName = null;
nhibernateType = null;
CollectionAccessExpression collectionExpr = expr.Expression as CollectionAccessExpression;
if (collectionExpr != null)
{
return(null);
}
PropertyAccessExpression propExpr = expr.Expression as PropertyAccessExpression;
if (propExpr != null)
{
memberName = propExpr.Name + "." + expr.Member.Name;
nhibernateType = propExpr.Expression.MetaData.GetPropertyType(memberName);
return(propExpr.Expression);
}
EntityExpression entityExpr = expr.Expression as EntityExpression;
if (entityExpr != null)
{
memberName = expr.Member.Name;
nhibernateType = entityExpr.MetaData.GetPropertyType(memberName);
return(entityExpr);
}
return(null);
}
protected override Expression VisitCollectionAccess(CollectionAccessExpression expr)
{
MemberNameVisitor visitor = new MemberNameVisitor(_rootCriteria, false);
visitor.Visit(expr.Expression);
visitor.CurrentCriteria.CreateCriteria(expr.Name, _alias, JoinType.LeftOuterJoin);
return(expr);
}
protected virtual Expression VisitCollectionAccess(CollectionAccessExpression expr)
{
EntityExpression e = (EntityExpression)Visit(expr.Expression);
if (e != expr.Expression)
{
return(new CollectionAccessExpression(expr.Name, expr.Type, expr.NHibernateType, e, expr.ElementExpression));
}
return(expr);
}
protected override Expression VisitMemberAccess(MemberExpression m)
{
CollectionAccessExpression parent = m.Expression as CollectionAccessExpression;
if (parent != null && m.Member.Name == "Count")
{
MethodInfo method = GetCountMethod(parent.ElementExpression.Type);
return(Expression.Call(method, CastIfNecessary(parent)));
}
return(base.VisitMemberAccess(m));
}
private Expression CastIfNecessary(CollectionAccessExpression expr)
{
if (expr.Type.IsGenericType)
{
return(expr);
}
MethodInfo method = typeof(Enumerable).GetMethod("Cast")
.MakeGenericMethod(expr.ElementExpression.Type);
return(Expression.Call(method, expr));
}
protected override Expression VisitCollectionAccess(CollectionAccessExpression expr)
{
expr = (CollectionAccessExpression)base.VisitCollectionAccess(expr);
//memberNameBuilder.Append(expr.Name + ".");
ResetMemberName(expr.Name + ".");
currentExpression = expr;
if (createCriteriaForCollections)
{
if (expr.ElementExpression != null)
{
currentCriteria = EnsureCriteria(expr.Name, expr.ElementExpression.Alias);
}
}
isQueringEntity = false;
return(expr);
}
protected override Expression VisitCollectionAccess(CollectionAccessExpression expr)
{
EntityExpression elementExpression = expr.ElementExpression;
if (elementExpression == null)
{
return(expr);
}
string alias = FindCollectionAlias(elementExpression.Type);
if (String.IsNullOrEmpty(alias))
{
return(expr);
}
elementExpression = new EntityExpression(elementExpression.AssociationPath, alias, elementExpression.Type, elementExpression.MetaData, elementExpression.Expression);
return(new CollectionAccessExpression(expr.Name, expr.Type, expr.NHibernateType, expr.Expression, elementExpression));
}
protected override Expression VisitMethodCall(MethodCallExpression expr)
{
if (WhereArgumentsVisitor.SupportsMethod(expr.Method.Name))
{
return(VisitCriterionExpression(expr));
}
//TODO: this needs to be refactored...
//create any collection subcriteria and get the collection access expression
MemberNameVisitor memberVisitor = new MemberNameVisitor(_rootCriteria, true);
memberVisitor.Visit(expr.Arguments[0]);
CollectionAccessExpression collectionExpr = (CollectionAccessExpression)memberVisitor.CurrentExpression;
string propertyName = null;
IProjection projection = null;
PropertyProjection currentProjection;
if (expr.Arguments.Count > 1)
{
propertyName = MemberNameVisitor.GetMemberName(_rootCriteria, expr.Arguments[1]);
}
else if ((currentProjection = _rootCriteria.GetProjection() as PropertyProjection) != null)
{
propertyName = currentProjection.PropertyName;
}
switch (expr.Method.Name)
{
case "Average":
projection = NHProjections.Avg(propertyName);
break;
case "Count":
case "LongCount":
if (expr.Arguments.Count > 1)
{
_rootCriteria.Add(WhereArgumentsVisitor.GetCriterion(_rootCriteria, _session, expr.Arguments[1]));
}
if (collectionExpr != null)
{
//get count on collection element's identifier property
propertyName = memberVisitor.MemberName + "." + collectionExpr.ElementExpression.MetaData.IdentifierPropertyName;
projection = NHProjections.Count(propertyName);
}
else
{
projection = NHProjections.RowCount();
}
break;
case "Max":
projection = NHProjections.Max(propertyName);
break;
case "Min":
projection = NHProjections.Min(propertyName);
break;
case "Sum":
projection = NHProjections.Sum(propertyName);
break;
default:
throw new NotImplementedException("The method '" + expr.Method.Name + "' is not implemented.");
}
_projections.Add(projection);
return(expr);
}
protected override Expression VisitCollectionAccess(CollectionAccessExpression expr)
{
return(VisitPropertyAccess(expr));
}
protected override Expression VisitCollectionAccess(CollectionAccessExpression expr)
{
Type = BinaryCriterionType.Property;
return(expr);
}
