private static ProjectionInfo AsArithmeticProjection(Expression expression)
{
if (!(expression is BinaryExpression be))
{
if (expression is UnaryExpression unary && unary.NodeType == ExpressionType.Negate)
{
return(ProjectionInfo.ForProjection(
new SqlFunctionProjection(_unaryNegateTemplate, TypeFactory.HeuristicType(unary.Type), FindMemberProjection(unary.Operand).AsProjection())));
}
var unwrapExpression = UnwrapConvertExpression(expression);
return(unwrapExpression != null?AsArithmeticProjection(unwrapExpression) : null);
}
if (!_binaryArithmethicTemplates.TryGetValue(be.NodeType, out var template))
{
return(null);
}
return(ProjectionInfo.ForProjection(
new SqlFunctionProjection(
template,
TypeFactory.HeuristicType(be.Type),
FindMemberProjection(be.Left).AsProjection(),
FindMemberProjection(be.Right).AsProjection())));
}
/// <summary>
/// Retrieves the projection for the expression
/// </summary>
public static ProjectionInfo FindMemberProjection(Expression expression)
{
if (!IsMemberExpression(expression))
{
return(ProjectionInfo.ForProjection(Projections.Constant(FindValue(expression))));
}
var unaryExpression = expression as UnaryExpression;
if (unaryExpression != null)
{
if (!IsConversion(unaryExpression.NodeType))
{
throw new Exception("Cannot interpret member from " + expression);
}
return(FindMemberProjection(unaryExpression.Operand));
}
var methodCallExpression = expression as MethodCallExpression;
if (methodCallExpression != null)
{
var signature = Signature(methodCallExpression.Method);
Func <MethodCallExpression, IProjection> processor;
if (_customProjectionProcessors.TryGetValue(signature, out processor))
{
return(ProjectionInfo.ForProjection(processor(methodCallExpression)));
}
}
return(ProjectionInfo.ForProperty(FindMemberExpression(expression)));
}
/// <summary>
/// Retrieves the projection for the expression
/// </summary>
public static ProjectionInfo FindMemberProjection(Expression expression)
{
if (!IsMemberExpression(expression))
{
return(ProjectionInfo.ForProjection(Projections.Constant(FindValue(expression))));
}
if (expression is UnaryExpression)
{
UnaryExpression unaryExpression = (UnaryExpression)expression;
if (!IsConversion(unaryExpression.NodeType))
{
throw new Exception("Cannot interpret member from " + expression.ToString());
}
return(FindMemberProjection(unaryExpression.Operand));
}
if (expression is MethodCallExpression)
{
MethodCallExpression methodCallExpression = (MethodCallExpression)expression;
string signature = Signature(methodCallExpression.Method);
if (_customProjectionProcessors.ContainsKey(signature))
{
return(ProjectionInfo.ForProjection(_customProjectionProcessors[signature](methodCallExpression)));
}
}
return(ProjectionInfo.ForProperty(FindMemberExpression(expression)));
}
/// <summary>
/// Retrieves the projection for the expression
/// </summary>
public static ProjectionInfo FindMemberProjection(Expression expression)
{
if (!IsMemberExpression(expression))
{
return(AsArithmeticProjection(expression)
?? ProjectionInfo.ForProjection(Projections.Constant(FindValue(expression), NHibernateUtil.GuessType(expression.Type))));
}
var unwrapExpression = UnwrapConvertExpression(expression);
if (unwrapExpression != null)
{
return(FindMemberProjection(unwrapExpression));
}
var methodCallExpression = expression as MethodCallExpression;
if (methodCallExpression != null)
{
var signature = Signature(methodCallExpression.Method);
Func <Expression, IProjection> processor;
if (_customProjectionProcessors.TryGetValue(signature, out processor))
{
return(ProjectionInfo.ForProjection(processor(methodCallExpression)));
}
}
var memberExpression = expression as MemberExpression;
if (memberExpression != null)
{
var signature = Signature(memberExpression.Member);
Func <Expression, IProjection> processor;
if (_customProjectionProcessors.TryGetValue(signature, out processor))
{
return(ProjectionInfo.ForProjection(processor(memberExpression)));
}
}
return(ProjectionInfo.ForProperty(FindMemberExpression(expression)));
}
