/// <summary>
/// Generate an expand item (and a select item for the implicit nav prop if necessary) based on an ExpandTermToken
/// </summary>
/// <param name="tokenIn">the expandTerm token to visit</param>
/// <returns>the expand item for this expand term token.</returns>
private SelectItem GenerateExpandItem(ExpandTermToken tokenIn)
{
ExceptionUtils.CheckArgumentNotNull(tokenIn, "tokenIn");
PathSegmentToken currentToken = tokenIn.PathToNavigationProp;
IEdmStructuredType currentLevelEntityType = this.EdmType;
List <ODataPathSegment> pathSoFar = new List <ODataPathSegment>();
PathSegmentToken firstNonTypeToken = currentToken;
if (currentToken.IsNamespaceOrContainerQualified())
{
pathSoFar.AddRange(SelectExpandPathBinder.FollowTypeSegments(currentToken, this.Model, this.Settings.SelectExpandLimit, this.configuration.Resolver, ref currentLevelEntityType, out firstNonTypeToken));
}
IEdmProperty edmProperty = this.configuration.Resolver.ResolveProperty(currentLevelEntityType, firstNonTypeToken.Identifier);
if (edmProperty == null)
{
throw new ODataException(ODataErrorStrings.MetadataBinder_PropertyNotDeclared(currentLevelEntityType.FullTypeName(), currentToken.Identifier));
}
IEdmNavigationProperty currentNavProp = edmProperty as IEdmNavigationProperty;
IEdmStructuralProperty currentComplexProp = edmProperty as IEdmStructuralProperty;
if (currentNavProp == null && currentComplexProp == null)
{
throw new ODataException(ODataErrorStrings.ExpandItemBinder_PropertyIsNotANavigationPropertyOrComplexProperty(currentToken.Identifier, currentLevelEntityType.FullTypeName()));
}
if (currentComplexProp != null)
{
currentNavProp = ParseComplexTypesBeforeNavigation(currentComplexProp, ref firstNonTypeToken, pathSoFar);
}
// ensure that we're always dealing with proper V4 syntax
if (firstNonTypeToken.NextToken != null && firstNonTypeToken.NextToken.NextToken != null)
{
throw new ODataException(ODataErrorStrings.ExpandItemBinder_TraversingMultipleNavPropsInTheSamePath);
}
bool isRef = false;
if (firstNonTypeToken.NextToken != null)
{
// lastly... make sure that, since we're on a NavProp, that the next token isn't null.
if (firstNonTypeToken.NextToken.Identifier == UriQueryConstants.RefSegment)
{
isRef = true;
}
else
{
throw new ODataException(ODataErrorStrings.ExpandItemBinder_TraversingMultipleNavPropsInTheSamePath);
}
}
// Add the segments in select and expand to parsed segments
this.parsedSegments.AddRange(pathSoFar);
IEdmNavigationSource targetNavigationSource = null;
if (this.NavigationSource != null)
{
IEdmPathExpression bindingPath;
targetNavigationSource = this.NavigationSource.FindNavigationTarget(currentNavProp, BindingPathHelper.MatchBindingPath, this.parsedSegments, out bindingPath);
}
NavigationPropertySegment navSegment = new NavigationPropertySegment(currentNavProp, targetNavigationSource);
pathSoFar.Add(navSegment);
this.parsedSegments.Add(navSegment); // Add the navigation property segment to parsed segments for future usage.
ODataExpandPath pathToNavProp = new ODataExpandPath(pathSoFar);
ApplyClause applyOption = null;
if (tokenIn.ApplyOptions != null)
{
MetadataBinder binder = this.BuildNewMetadataBinder(targetNavigationSource);
ApplyBinder applyBinder = new ApplyBinder(binder.Bind, binder.BindingState);
applyOption = applyBinder.BindApply(tokenIn.ApplyOptions);
}
ComputeClause computeOption = null;
if (tokenIn.ComputeOption != null)
{
MetadataBinder binder = this.BuildNewMetadataBinder(targetNavigationSource);
ComputeBinder computeBinder = new ComputeBinder(binder.Bind);
computeOption = computeBinder.BindCompute(tokenIn.ComputeOption);
}
var generatedProperties = GetGeneratedProperties(computeOption, applyOption);
bool collapsed = applyOption?.Transformations.Any(t => t.Kind == TransformationNodeKind.Aggregate || t.Kind == TransformationNodeKind.GroupBy) ?? false;
// call MetadataBinder to build the filter clause
FilterClause filterOption = null;
if (tokenIn.FilterOption != null)
{
MetadataBinder binder = this.BuildNewMetadataBinder(targetNavigationSource, generatedProperties, collapsed);
FilterBinder filterBinder = new FilterBinder(binder.Bind, binder.BindingState);
filterOption = filterBinder.BindFilter(tokenIn.FilterOption);
}
// call MetadataBinder again to build the orderby clause
OrderByClause orderbyOption = null;
if (tokenIn.OrderByOptions != null)
{
MetadataBinder binder = this.BuildNewMetadataBinder(targetNavigationSource, generatedProperties, collapsed);
OrderByBinder orderByBinder = new OrderByBinder(binder.Bind);
orderbyOption = orderByBinder.BindOrderBy(binder.BindingState, tokenIn.OrderByOptions);
}
SearchClause searchOption = null;
if (tokenIn.SearchOption != null)
{
MetadataBinder binder = this.BuildNewMetadataBinder(targetNavigationSource);
SearchBinder searchBinder = new SearchBinder(binder.Bind);
searchOption = searchBinder.BindSearch(tokenIn.SearchOption);
}
if (isRef)
{
return(new ExpandedReferenceSelectItem(pathToNavProp, targetNavigationSource, filterOption, orderbyOption, tokenIn.TopOption, tokenIn.SkipOption, tokenIn.CountQueryOption, searchOption, computeOption, applyOption));
}
SelectExpandClause subSelectExpand;
if (tokenIn.ExpandOption != null)
{
subSelectExpand = this.GenerateSubExpand(tokenIn);
}
else
{
subSelectExpand = BuildDefaultSubExpand();
}
subSelectExpand = this.DecorateExpandWithSelect(subSelectExpand, currentNavProp, tokenIn.SelectOption, this.CreateBindingState(targetNavigationSource, generatedProperties, collapsed));
LevelsClause levelsOption = ParseLevels(tokenIn.LevelsOption, currentLevelEntityType, currentNavProp);
return(new ExpandedNavigationSelectItem(pathToNavProp, targetNavigationSource, subSelectExpand, filterOption, orderbyOption, tokenIn.TopOption, tokenIn.SkipOption, tokenIn.CountQueryOption, searchOption, levelsOption, computeOption, applyOption));
}