public IPredicateVisitor Convert(Expression expression, IPredicateVisitorFactory predicateVisitorFactory)
{
MethodCallExpression methodCallExpression = expression as MethodCallExpression;
if (methodCallExpression == null)
{
return(null);
}
string methodName = FilterMapping.AllowedGroupMethods[methodCallExpression.Method.Name];
ConstantPredicateVisitor method = new ConstantPredicateVisitor(methodName);
IPredicateVisitor parent = predicateVisitorFactory.Create(methodCallExpression.Arguments[0]);
List <IPredicateVisitor> parameters = new List <IPredicateVisitor>();
if (methodCallExpression.Arguments[1].NodeType != ExpressionType.NewArrayInit)
{
return(null);
}
foreach (Expression part in ((NewArrayExpression)methodCallExpression.Arguments[1]).Expressions)
{
parameters.Add(predicateVisitorFactory.Create(part));
}
CollectionPredicateVisitor collection = new CollectionPredicateVisitor(parameters);
EqualPredicateVisitor equal = new EqualPredicateVisitor(method, collection);
Visitors.AccessorPredicateVisitor accessor = new Visitors.AccessorPredicateVisitor(equal, parent);
return(accessor);
}
private static bool ArePropertiesEqual(Visitors.AccessorPredicateVisitor left, Visitors.AccessorPredicateVisitor right)
{
ConstantPredicateVisitor constantLeft = left.Current as ConstantPredicateVisitor;
ConstantPredicateVisitor constantRight = right.Current as ConstantPredicateVisitor;
if (constantLeft != null && constantRight != null)
{
return(constantLeft.Constant == constantRight.Constant);
}
return(false);
}
private static IPredicateVisitor CombinePredicateVisitors(IPredicateVisitor left, IPredicateVisitor right)
{
EqualPredicateVisitor equalLeft = left as EqualPredicateVisitor;
EqualPredicateVisitor equalRight = right as EqualPredicateVisitor;
Visitors.AccessorPredicateVisitor accessorLeft = equalLeft?.Left as Visitors.AccessorPredicateVisitor;
Visitors.AccessorPredicateVisitor accessorRight = equalRight?.Left as Visitors.AccessorPredicateVisitor;
IPredicateVisitor collection;
if (equalLeft?.Right is RangeCollectionPredicateVisitor rangeLeft &&
equalRight?.Right is RangeCollectionPredicateVisitor rangeRight)
{
List <RangePredicateVisitor> combinedRanges = new List <RangePredicateVisitor>();
combinedRanges.AddRange(rangeLeft.Ranges);
combinedRanges.AddRange(rangeRight.Ranges);
collection = new RangeCollectionPredicateVisitor(combinedRanges);
}