internal virtual Expression VisitInputReferenceExpression(InputReferenceExpression ire)
{
// Debug.Assert(ire != null, "ire != null -- otherwise caller never should have visited here");
ResourceExpression re = (ResourceExpression)this.Visit(ire.Target);
return(re.CreateReference());
}
internal void OverrideTarget(ResourceSetExpression newTarget)
{
Debug.Assert(newTarget != null, "Resource set cannot be null");
Debug.Assert(newTarget.ResourceType.Equals(this.Type), "Cannot reference a resource set with a different resource type");
this.target = newTarget;
}
private static void AnalyzeResourceExpression(LambdaExpression lambda, ResourceExpression resource)
{
PathBox pb = new PathBox();
ProjectionAnalyzer.Analyze(lambda, pb);
resource.Projection = new ProjectionQueryOptionExpression(lambda.Body.Type, lambda, pb.ProjectionPaths.ToList());
resource.ExpandPaths = pb.ExpandPaths.Union(resource.ExpandPaths, StringComparer.Ordinal).ToList();
}
internal void VisitQueryOptions(ResourceExpression re)
{
if (re.HasQueryOptions)
{
ResourceSetExpression rse = re as ResourceSetExpression;
if (rse != null)
{
IEnumerator options = rse.SequenceQueryOptions.GetEnumerator();
while (options.MoveNext())
{
Expression e = (Expression)options.Current;
ResourceExpressionType et = (ResourceExpressionType)e.NodeType;
switch (et)
{
case ResourceExpressionType.RequestOptions:
this.VisitQueryOptionExpression((RequestOptionsQueryOptionExpression)e);
break;
case ResourceExpressionType.OperationContext:
this.VisitQueryOptionExpression((OperationContextQueryOptionExpression)e);
break;
case ResourceExpressionType.Resolver:
this.VisitQueryOptionExpression((EntityResolverQueryOptionExpression)e);
break;
case ResourceExpressionType.TakeQueryOption:
this.VisitQueryOptionExpression((TakeQueryOptionExpression)e);
break;
case ResourceExpressionType.FilterQueryOption:
this.VisitQueryOptionExpression((FilterQueryOptionExpression)e);
break;
default:
Debug.Assert(false, "Unexpected expression type " + (int)et);
break;
}
}
}
if (re.Projection != null && re.Projection.Paths.Count > 0)
{
this.Projection = re.Projection;
this.SelectColumns = re.Projection.Paths;
}
if (re.CustomQueryOptions.Count > 0)
{
this.VisitCustomQueryOptions(re.CustomQueryOptions);
}
}
}
internal static Expression Bind(Expression e, ResourceExpression currentInput, ParameterExpression inputParameter, List <ResourceExpression> referencedInputs)
{
Debug.Assert(e != null, "Expression cannot be null");
Debug.Assert(currentInput != null, "A current input resource set is required");
Debug.Assert(inputParameter != null, "The input lambda parameter is required");
Debug.Assert(referencedInputs != null, "The referenced inputs list is required");
InputBinder binder = new InputBinder(currentInput, inputParameter);
Expression result = binder.Visit(e);
referencedInputs.AddRange(binder.referencedInputs);
return(result);
}
internal static bool Analyze(LambdaExpression le, ResourceExpression re, bool matchMembers)
{
Debug.Assert(le != null, "le != null");
if (le.Body.NodeType == ExpressionType.Constant)
{
if (CommonUtil.IsClientType(le.Body.Type))
{
throw new NotSupportedException(SR.ALinqCannotCreateConstantEntity);
}
re.Projection = new ProjectionQueryOptionExpression(le.Body.Type, le, new List <string>());
return(true);
}
if (le.Body.NodeType == ExpressionType.Call)
{
MethodCallExpression mce = le.Body as MethodCallExpression;
if (mce.Method == ReflectionUtil.ProjectMethodInfo.MakeGenericMethod(le.Body.Type))
{
ConstantExpression paths = mce.Arguments[1] as ConstantExpression;
re.Projection = new ProjectionQueryOptionExpression(le.Body.Type, ProjectionQueryOptionExpression.DefaultLambda, new List <string>((string[])paths.Value));
return(true);
}
}
if (le.Body.NodeType == ExpressionType.MemberInit || le.Body.NodeType == ExpressionType.New)
{
AnalyzeResourceExpression(le, re);
return(true);
}
if (matchMembers)
{
Expression withoutConverts = SkipConverts(le.Body);
if (withoutConverts.NodeType == ExpressionType.MemberAccess)
{
AnalyzeResourceExpression(le, re);
return(true);
}
}
return(false);
}
#pragma warning disable 618
internal InputReferenceExpression(ResourceExpression target)
: base((ExpressionType)ResourceExpressionType.InputReference, target.ResourceType)
{
Debug.Assert(target != null, "Target resource set cannot be null");
this.target = target;
}
internal override Expression VisitMemberAccess(MemberExpression m)
{
if (this.inputSet == null ||
!this.inputSet.HasTransparentScope)
{
return(base.VisitMemberAccess(m));
}
ParameterExpression innerParamRef = null;
Stack <PropertyInfo> nestedAccesses = new Stack <PropertyInfo>();
MemberExpression memberRef = m;
while (memberRef != null &&
memberRef.Member.MemberType == MemberTypes.Property &&
memberRef.Expression != null)
{
nestedAccesses.Push((PropertyInfo)memberRef.Member);
if (memberRef.Expression.NodeType == ExpressionType.Parameter)
{
innerParamRef = (ParameterExpression)memberRef.Expression;
}
memberRef = memberRef.Expression as MemberExpression;
}
if (innerParamRef != this.inputParameter || nestedAccesses.Count == 0)
{
return(m);
}
ResourceExpression target = this.input;
ResourceSetExpression targetSet = this.inputSet;
bool transparentScopeTraversed = false;
while (nestedAccesses.Count > 0)
{
if (targetSet == null || !targetSet.HasTransparentScope)
{
break;
}
PropertyInfo currentProp = nestedAccesses.Peek();
if (currentProp.Name.Equals(targetSet.TransparentScope.Accessor, StringComparison.Ordinal))
{
target = targetSet;
nestedAccesses.Pop();
transparentScopeTraversed = true;
continue;
}
Expression source;
if (!targetSet.TransparentScope.SourceAccessors.TryGetValue(currentProp.Name, out source))
{
break;
}
transparentScopeTraversed = true;
nestedAccesses.Pop();
Debug.Assert(source != null, "source != null -- otherwise ResourceBinder created an accessor to nowhere");
InputReferenceExpression sourceReference = source as InputReferenceExpression;
if (sourceReference == null)
{
targetSet = source as ResourceSetExpression;
if (targetSet == null || !targetSet.HasTransparentScope)
{
target = (ResourceExpression)source;
}
}
else
{
targetSet = sourceReference.Target as ResourceSetExpression;
target = targetSet;
}
}
if (!transparentScopeTraversed)
{
return(m);
}
Expression result = this.CreateReference(target);
while (nestedAccesses.Count > 0)
{
result = Expression.Property(result, nestedAccesses.Pop());
}
return(result);
}
private InputBinder(ResourceExpression resource, ParameterExpression setReferenceParam)
{
this.input = resource;
this.inputSet = resource as ResourceSetExpression;
this.inputParameter = setReferenceParam;
}
private Expression CreateReference(ResourceExpression resource)
{
this.referencedInputs.Add(resource);
return(resource.CreateReference());
}