public static Criterion From(BinaryExpression expression)
{
if (expression.NodeType == ExpressionType.OrElse || expression.NodeType == ExpressionType.AndAlso)
{
return(BinaryCriterion.From(expression));
}
Criterion create(string property)
{
if (property.IsEmpty())
{
return(null);
}
return(new Criterion(property, expression.NodeType.ToFilterFunction(), expression.Right.GetValue()));
}
var left = expression.Left;
if (left is ParameterExpression)
{
return(create("ID"));
}
if (left is MemberExpression memberEx)
{
return(create(memberEx.GetDatabaseColumnPath()));
}
if (left is UnaryExpression unary && unary.Operand is MemberExpression member)
{
return(create(member.GetDatabaseColumnPath()));
}
return(null);
}
Criterion ProcessCriteria(Expression expression)
{
var binary = expression as BinaryExpression;
if (binary != null)
{
if (binary.NodeType == ExpressionType.OrElse)
{
var criterion = BinaryCriterion.From <T>(binary);
if (criterion?.IsConvertedCompletely == false)
{
ConvertedCompletely = false;
}
return(criterion);
}
}
return(CreateCriterion(expression));
}
public BinaryCriterion And(BinaryCriterion left, BinaryCriterion right)
{
return(new BinaryCriterion(left, BinaryOperator.AND, right));
}
public BinaryCriterion Or(BinaryCriterion left, BinaryCriterion right)
{
return(new BinaryCriterion(left, BinaryOperator.OR, right));
}
string Generate(BinaryCriterion criterion)
{
return($"({Generate(criterion.Left)} {criterion.Operator} {Generate(criterion.Right)})");
}
