/// <summary>
/// Try to bind an identifier to a FunctionCallNode
/// </summary>
/// <param name="identifier">the identifier to bind</param>
/// <param name="arguments">the semantically bound list of arguments.</param>
/// <param name="parent">a semantically bound parent node.</param>
/// <param name="state">the current state of the binding algorithm</param>
/// <param name="boundFunction">a single value function call node representing this function call, if we found one.</param>
/// <returns>true if we found a function for this token.</returns>
private bool TryBindIdentifier(string identifier, IEnumerable <FunctionParameterToken> arguments, QueryNode parent, BindingState state, out QueryNode boundFunction)
{
boundFunction = null;
IEdmType bindingType = null;
SingleValueNode singleValueParent = parent as SingleValueNode;
if (singleValueParent != null)
{
if (singleValueParent.TypeReference != null)
{
bindingType = singleValueParent.TypeReference.Definition;
}
}
else
{
CollectionNode collectionValueParent = parent as CollectionNode;
if (collectionValueParent != null)
{
bindingType = collectionValueParent.CollectionType.Definition;
}
}
if (!UriEdmHelpers.IsBindingTypeValid(bindingType))
{
return(false);
}
// All functions should be fully qualified, if they aren't they they aren't functions.
// When using extension, there may be function call with unqualified name. So loose the restriction here.
if (identifier.IndexOf(".", StringComparison.Ordinal) == -1 && this.Resolver.GetType() == typeof(ODataUriResolver))
{
return(false);
}
IEdmOperation operation;
List <FunctionParameterToken> syntacticArguments = arguments == null ? new List <FunctionParameterToken>() : arguments.ToList();
if (!FunctionOverloadResolver.ResolveOperationFromList(identifier, syntacticArguments.Select(ar => ar.ParameterName).ToList(), bindingType, state.Model, out operation, this.Resolver))
{
// TODO: FunctionOverloadResolver.ResolveOperationFromList() looks up the function by parameter names, but it shouldn't ignore parameter types. (test case ParseFilter_AliasInFunction_PropertyAsValue_TypeMismatch should fail)
return(false);
}
if (singleValueParent != null && singleValueParent.TypeReference == null)
{
// if the parent exists, but has no type information, then we're in open type land, and we
// shouldn't go any farther.
throw new ODataException(ODataErrorStrings.FunctionCallBinder_CallingFunctionOnOpenProperty(identifier));
}
if (operation.IsAction())
{
return(false);
}
IEdmFunction function = (IEdmFunction)operation;
// TODO: $filter $orderby parameter expression which contains complex or collection should NOT be supported in this way
// but should be parsed into token tree, and binded to node tree: parsedParameters.Select(p => this.bindMethod(p));
ICollection <FunctionParameterToken> parsedParameters = HandleComplexOrCollectionParameterValueIfExists(state.Configuration.Model, function, syntacticArguments, state.Configuration.Resolver.EnableCaseInsensitive);
IEnumerable <QueryNode> boundArguments = parsedParameters.Select(p => this.bindMethod(p));
boundArguments = boundArguments.ToList(); // force enumerable to run : will immediately evaluate all this.bindMethod(p).
IEdmTypeReference returnType = function.ReturnType;
IEdmEntitySetBase returnSet = null;
SingleResourceNode singleEntityNode = parent as SingleResourceNode;
if (singleEntityNode != null)
{
returnSet = function.GetTargetEntitySet(singleEntityNode.NavigationSource, state.Model);
}
string functionName = function.FullName();
if (returnType.IsEntity())
{
boundFunction = new SingleResourceFunctionCallNode(functionName, new[] { function }, boundArguments, (IEdmEntityTypeReference)returnType.Definition.ToTypeReference(), returnSet, parent);
}
else if (returnType.IsStructuredCollection())
{
IEdmCollectionTypeReference collectionTypeReference = (IEdmCollectionTypeReference)returnType;
boundFunction = new CollectionResourceFunctionCallNode(functionName, new[] { function }, boundArguments, collectionTypeReference, returnSet, parent);
}
else if (returnType.IsCollection())
{
IEdmCollectionTypeReference collectionTypeReference = (IEdmCollectionTypeReference)returnType;
boundFunction = new CollectionFunctionCallNode(functionName, new[] { function }, boundArguments, collectionTypeReference, parent);
}
else
{
boundFunction = new SingleValueFunctionCallNode(functionName, new[] { function }, boundArguments,
returnType, parent);
}
return(true);
}
/// <summary>
/// Visit a SingleResourceFunctionCallNode
/// </summary>
/// <param name="nodeIn">the node to visit</param>
/// <returns>Defined by the implementer</returns>
public virtual T Visit(SingleResourceFunctionCallNode nodeIn)
{
throw new NotImplementedException();
}