protected override Expression VisitBinary(BinaryExpression node)
{
switch (node.NodeType)
{
case ExpressionType.Equal:
var constantExpression = node.Right as ConstantExpression;
if (constantExpression == null)
{
throw new NotSupportedException(Resources.KeySelectorVisitor_VisitBinary_The_right_operand_of_a_binary_expression_must_be_a_constant);
}
var primaryKey = MemberEvaluator.Evaluate(node.Left);
_primaryKeys.Add(primaryKey, constantExpression.Value == null ? "@" : constantExpression.Value.ToString());
return(node);
case ExpressionType.And:
return(base.VisitBinary(node));
case ExpressionType.AndAlso:
return(base.VisitBinary(node));
default:
throw new NotSupportedException(string.Format(Resources.KeySelectorVisitor_VisitBinary_Expressions_of_type_0_are_not_supported_in_primary_key_predicates, node.NodeType));
}
}
/// <summary>
/// Visits the member.
/// </summary>
/// <param name="member">The member.</param>
/// <returns></returns>
protected override Expression VisitMember(MemberExpression member)
{
if (member.Member.DeclaringType == typeof(QueryContext))
{
_filterExpression.Append(QueryContextEvaluator.Evaluate(member));
return(member);
}
_filterExpression.Append(MemberEvaluator.Evaluate(member));
return(member);
}
private Expression VisitStaticEnumerableContainsMethodCall(MethodCallExpression methodCall)
{
var member = MemberEvaluator.Evaluate(methodCall.Arguments[1]);
_filterExpression.Append(member);
_filterExpression.Append("=");
var enumerable = (IEnumerable)((ConstantExpression)methodCall.Arguments[0]).Value;
var operandValues = (from object operandValue in enumerable select(operandValue ?? "@").ToString()).ToArray();
_filterExpression.Append(operandValues.Any() ? string.Join(",", operandValues) : "@");
return(methodCall);
}
protected virtual Expression VisitOrderByMethodCall(MethodCallExpression methodCall, string direction)
{
Visit(methodCall.Arguments[0]);
if (SortExpression.Length > 0)
{
_sortExpression.Append(',');
}
_sortExpression.Append('@');
_sortExpression.Append(MemberEvaluator.Evaluate(methodCall.Arguments[1]));
_sortExpression.Append(" ");
_sortExpression.Append(direction);
return(methodCall);
}
private Expression VisitDirectPredicateMethodCall(MethodCallExpression methodCall)
{
if (methodCall.Method.Name != "Member")
{
throw new NotSupportedException();
}
var dataObjectType = methodCall.Method.DeclaringType.GetGenericArguments().First();
_filterExpression.Append("!");
_filterExpression.Append(dataObjectType.Name);
_filterExpression.Append(".");
_filterExpression.Append(MemberEvaluator.Evaluate(methodCall.Arguments.First()));
return(methodCall);
}
private Expression VisitStaticEnumerableAnyMethodCall(MethodCallExpression methodCall)
{
if (methodCall.Arguments.Count != 2)
{
throw new NotSupportedException();
}
var member = MemberEvaluator.Evaluate(methodCall.Arguments[0]);
_filterExpression.Append(member);
_filterExpression.Append(".");
int?queryId;
var predicate = Translate(methodCall.Arguments[1], out queryId);
_filterExpression.Append(predicate);
return(methodCall);
}
protected override Expression VisitMethodCall(MethodCallExpression methodCall)
{
if (methodCall.Method.DeclaringType != typeof(Enumerable))
{
throw new NotSupportedException(string.Format(Resources.VisitMethodCall_The_method_call_0_on_type_1_is_not_supported, methodCall.Method.Name, methodCall.Method.DeclaringType));
}
if (methodCall.Method.Name != "Contains")
{
throw new NotSupportedException(string.Format(Resources.VisitMethodCall_The_method_call_0_on_type_1_is_not_supported, methodCall.Method.Name, methodCall.Method.DeclaringType));
}
var memberExpression = methodCall.Arguments[0] as MemberExpression;
if (memberExpression == null || memberExpression.Member.DeclaringType != typeof(QueryContext))
{
throw new NotSupportedException();
}
switch (memberExpression.Member.Name)
{
case "WritableAdministrativeUnitIds":
_filterExpression.Append(MemberEvaluator.Evaluate(methodCall.Arguments[1]));
_filterExpression.Append("=");
_filterExpression.Append("|AI_RED|");
break;
case "ActiveAdministrativeUnitSubHierarchyIds":
_filterExpression.Append(MemberEvaluator.Evaluate(methodCall.Arguments[1]));
_filterExpression.Append("=");
_filterExpression.Append("|AI_UND|");
break;
case "ActiveAdministrativeUnitHierarchyIds":
_filterExpression.Append(MemberEvaluator.Evaluate(methodCall.Arguments[1]));
_filterExpression.Append("=");
_filterExpression.Append("|AI_FULL|");
break;
default:
throw new NotSupportedException(string.Format(Resources.QueryContextVisitor_VisitMethodCall_The_method_0_on_1_is_not_supported, methodCall.Method.Name, methodCall.Method.DeclaringType));
}
return(methodCall);
}
protected virtual Expression VisitIncludeMethodCall(MethodCallExpression methodCall)
{
Visit(methodCall.Arguments[0]);
var lambda = (LambdaExpression)StripQuotes(methodCall.Arguments[1]);
var memberPath = MemberEvaluator.Evaluate(lambda.Body);
var memberPathElements = memberPath.Split('.');
var memberExpressionPathElements = UnwindMemberAccess(lambda.Body).Reverse().ToList();
for (var memberPathElementIndex = 0; memberPathElementIndex < memberPathElements.Length; memberPathElementIndex++)
{
var partialMemberLambdaBody = memberExpressionPathElements[memberPathElementIndex];
var partialMemberLambda = Expression.Lambda(partialMemberLambdaBody, lambda.Parameters.ToArray());
ProcessIncludeSelector(partialMemberLambda);
}
return(methodCall);
}
private Expression VisitStringMethodCall(MethodCallExpression methodCall)
{
_filterExpression.Append(MemberEvaluator.Evaluate(methodCall.Object));
_filterExpression.Append("=");
switch (methodCall.Method.Name)
{
case "StartsWith":
return(VisitStringStartsWithMethodCall(methodCall));
case "EndsWith":
return(VisitStringEndsWithMethodCall(methodCall));
case "Contains":
return(VisitStringContainsMethodCall(methodCall));
default:
throw new NotSupportedException(string.Format(Resources.VisitMethodCall_The_method_call_0_on_type_1_is_not_supported, methodCall.Method.Name, methodCall.Method.DeclaringType));
}
}
protected virtual void ProcessIncludeSelector(LambdaExpression lambda)
{
var memberPath = MemberEvaluator.Evaluate(lambda.Body);
if (_includeSelectors.ContainsKey(memberPath))
{
return;
}
if (typeof(IDataObjectCollection).IsAssignableFrom(lambda.Body.Type))
{
var memberSelector = lambda.Compile();
_includeSelectors.Add(memberPath, memberSelector);
return;
}
if (typeof(INotifyPropertyChanged).IsAssignableFrom(lambda.Body.Type))
{
_relatedObjects.Add(memberPath);
var memberSelector = lambda.Compile();
_includeSelectors.Add(memberPath, memberSelector);
}
}
