public override HqlTreeNode BuildHql(
MethodInfo method,
Expression targetObject,
ReadOnlyCollection <Expression> arguments,
HqlTreeBuilder treeBuilder,
IHqlExpressionVisitor visitor)
{
// Get the StringComparison argument.
var comparison = (StringComparison)(arguments[1].As <ConstantExpression>().Value);
if (comparison == StringComparison.CurrentCultureIgnoreCase ||
comparison == StringComparison.InvariantCultureIgnoreCase ||
comparison == StringComparison.OrdinalIgnoreCase)
{
// If the comparison calls for us to ignore the case, use SQL LOWER()
return
(treeBuilder.Equality(
treeBuilder.MethodCall("lower", new[] { visitor.Visit(targetObject).AsExpression() }),
treeBuilder.MethodCall("lower", new[] { visitor.Visit(arguments[0]).AsExpression() })));
}
// Otherwise use the database's default string comparison mechanism.
return(treeBuilder.Equality(
visitor.Visit(targetObject).AsExpression(),
visitor.Visit(arguments[0]).AsExpression()));
}
private HqlTreeNode VisitTypeBinaryExpression(TypeBinaryExpression expression)
{
return(_hqlTreeBuilder.Equality(
_hqlTreeBuilder.Dot(
Visit(expression.Expression).AsExpression(),
_hqlTreeBuilder.Class()),
_hqlTreeBuilder.Ident(expression.TypeOperand.FullName)));
}
public override HqlTreeNode BuildHql(MethodInfo method, Expression targetObject, ReadOnlyCollection <Expression> arguments, HqlTreeBuilder treeBuilder, IHqlExpressionVisitor visitor)
{
var comparison = (StringComparison)(arguments[1].As <ConstantExpression>().Value);
if (comparison == StringComparison.CurrentCultureIgnoreCase ||
comparison == StringComparison.InvariantCultureIgnoreCase ||
comparison == StringComparison.OrdinalIgnoreCase)
{
return(treeBuilder.Equality(
treeBuilder.MethodCall("lower", new[] { visitor.Visit(targetObject).AsExpression() }),
treeBuilder.MethodCall("lower", new[] { visitor.Visit(arguments[0]).AsExpression() })));
}
return(treeBuilder.Equality(
visitor.Visit(targetObject).AsExpression(),
visitor.Visit(arguments[0]).AsExpression()));
}
internal HqlBooleanExpression BuildOfType(Expression expression, System.Type type)
{
var sessionFactory = _parameters.SessionFactory;
var meta = sessionFactory.GetClassMetadata(type) as Persister.Entity.AbstractEntityPersister;
if (meta != null && !meta.IsExplicitPolymorphism)
{
//Adapted the logic found in SingleTableEntityPersister.DiscriminatorFilterFragment
var nodes = meta
.SubclassClosure
.Select(typeName => (NHibernate.Persister.Entity.IQueryable)sessionFactory.GetEntityPersister(typeName))
.Where(persister => !persister.IsAbstract)
.Select(persister => _hqlTreeBuilder.Ident(persister.EntityName))
.ToList();
if (nodes.Count == 1)
{
return(_hqlTreeBuilder.Equality(
_hqlTreeBuilder.Dot(Visit(expression).AsExpression(), _hqlTreeBuilder.Class()),
nodes[0]));
}
if (nodes.Count > 1)
{
return(_hqlTreeBuilder.In(
_hqlTreeBuilder.Dot(
Visit(expression).AsExpression(),
_hqlTreeBuilder.Class()),
_hqlTreeBuilder.ExpressionSubTreeHolder(nodes)));
}
if (nodes.Count == 0)
{
const string abstractClassWithNoSubclassExceptionMessageTemplate =
@"The class {0} can't be instatiated and does not have mapped subclasses;
possible solutions:
- don't map the abstract class
- map its subclasses.";
throw new NotSupportedException(string.Format(abstractClassWithNoSubclassExceptionMessageTemplate, meta.EntityName));
}
}
return(_hqlTreeBuilder.Equality(
_hqlTreeBuilder.Dot(Visit(expression).AsExpression(), _hqlTreeBuilder.Class()),
_hqlTreeBuilder.Ident(type.FullName)));
}
private HqlEquality GenerateEqualityNode(Expression leftExpr, Expression rightExpr)
{
// TODO - why two visitors? Can't we just reuse?
var left = new HqlGeneratorExpressionTreeVisitor(_parameters);
var right = new HqlGeneratorExpressionTreeVisitor(_parameters);
return(_hqlTreeBuilder.Equality(left.Visit(leftExpr).AsExpression(), right.Visit(rightExpr).AsExpression()));
}
public override HqlTreeNode BuildHql(MethodInfo method, Expression targetObject, ReadOnlyCollection <Expression> arguments, HqlTreeBuilder treeBuilder, IHqlExpressionVisitor visitor)
{
HqlExpression targetExpression = visitor.Visit(targetObject).AsExpression();
HqlExpression argument0Expression = visitor.Visit(arguments[0]).AsExpression();
HqlEquality result = treeBuilder.Equality(targetExpression, argument0Expression);
return(result);
}
public override HqlTreeNode BuildHql(MethodInfo method, Expression targetObject, ReadOnlyCollection <Expression> arguments, HqlTreeBuilder treeBuilder, IHqlExpressionVisitor visitor)
{
Expression lhs = arguments.Count == 1 ? targetObject : arguments[0];
Expression rhs = arguments.Count == 1 ? arguments[0] : arguments[1];
return(treeBuilder.Equality(
visitor.Visit(lhs).ToArithmeticExpression(),
visitor.Visit(rhs).ToArithmeticExpression()));
}
public override HqlTreeNode BuildHql(MethodInfo method, Expression targetObject, ReadOnlyCollection <Expression> arguments, HqlTreeBuilder treeBuilder, IHqlExpressionVisitor visitor)
{
// HqlGeneratorExpressionTreeVisitor.VisitConstantExpression will always return an HqlEquality
// instead of HqlParameter for argument that is of type bool.
// Use the HqlParameter that exists as first children to the HqlEquality as second argument into treeBuilder.Equality
return(treeBuilder.Equality(
visitor.Visit(targetObject).AsExpression(),
visitor.Visit(arguments[0]).Children.First().AsExpression()));
}
public override HqlTreeNode BuildHql(MethodInfo method, Expression targetObject, ReadOnlyCollection <Expression> arguments, HqlTreeBuilder treeBuilder, IHqlExpressionVisitor visitor)
{
var isExtensionMethod = (targetObject == null);
var expressions = isExtensionMethod ? arguments : new[] { targetObject }.Concat(arguments);
var parameters = expressions.Select(o => visitor.Visit(o).AsExpression());
var methodCall = treeBuilder.MethodCall(SpatialDialect.HqlPrefix + (methodName ?? method.Name), parameters);
if (typeof(TResult) == typeof(bool))
{
return(treeBuilder.Equality(methodCall, treeBuilder.True()));
}
return(methodCall);
}
public override HqlTreeNode BuildHql(MemberInfo member, Expression expression, HqlTreeBuilder treeBuilder, IHqlExpressionVisitor visitor)
{
var methodCall = treeBuilder.MethodCall(SpatialDialect.HqlPrefix + member.Name, new[]
{
visitor.Visit(expression).AsExpression()
});
if (typeof(TResult) == typeof(bool))
{
return(treeBuilder.Equality(methodCall, treeBuilder.True()));
}
return(methodCall);
}
public override HqlTreeNode BuildHql(
MethodInfo method,
Expression targetObject,
ReadOnlyCollection <Expression> arguments,
HqlTreeBuilder treeBuilder,
IHqlExpressionVisitor visitor)
{
var left = treeBuilder.Cast(visitor.Visit(targetObject).AsExpression(), typeof(string));
var right = treeBuilder.Cast(visitor.Visit(arguments.First()).AsExpression(), typeof(string));
var leftSubstring = treeBuilder.MethodCall("substring", left, treeBuilder.Constant(4));
var rightSubstring = treeBuilder.MethodCall("substring", right, treeBuilder.Constant(4));
var equals = treeBuilder.Equality(leftSubstring, rightSubstring);
return(equals);
}
public override HqlTreeNode BuildHql(MethodInfo method, Expression targetObject, ReadOnlyCollection <Expression> arguments, HqlTreeBuilder treeBuilder, IHqlExpressionVisitor visitor)
{
// Instance a.CompareTo(b) or static string.Compare(a, b)?
Expression lhs = arguments.Count == 1 ? targetObject : arguments[0];
Expression rhs = arguments.Count == 1 ? arguments[0] : arguments[1];
HqlExpression lhs1 = visitor.Visit(lhs).AsExpression();
HqlExpression rhs1 = visitor.Visit(rhs).AsExpression();
HqlExpression lhs2 = visitor.Visit(lhs).AsExpression();
HqlExpression rhs2 = visitor.Visit(rhs).AsExpression();
// CASE WHEN (table.[Name] = N'Foo') THEN 0
// WHEN (table.[Name] > N'Foo') THEN 1
// ELSE -1 END
return(treeBuilder.Case(
new[]
{
treeBuilder.When(treeBuilder.Equality(lhs1, rhs1), treeBuilder.Constant(0)),
treeBuilder.When(treeBuilder.GreaterThan(lhs2, rhs2), treeBuilder.Constant(1))
},
treeBuilder.Constant(-1)));
}
public override HqlTreeNode BuildHql(MethodInfo method, Expression targetObject,
ReadOnlyCollection <Expression> arguments, HqlTreeBuilder treeBuilder, IHqlExpressionVisitor visitor)
{
return(treeBuilder.Equality(visitor.Visit(targetObject).AsExpression(),
visitor.Visit(arguments[0]).AsExpression()));
}
private HqlEquality GenerateEqualityNode(Expression leftExpr, Expression rightExpr, IHqlExpressionVisitor visitor)
{
return(_hqlTreeBuilder.Equality(
visitor.Visit(leftExpr).ToArithmeticExpression(),
visitor.Visit(rightExpr).ToArithmeticExpression()));
}
