/// <summary>
/// Gets canonical url of current resource.
/// </summary>
/// <returns>The canonical url of current resource.</returns>
public virtual Uri GetCanonicalUrl()
{
if (this.canonicalUrl != null)
{
return(this.canonicalUrl);
}
// canonicalUrl = HasNonComputedId
if (this.resource.HasNonComputedId)
{
return(this.canonicalUrl = this.resource.NonComputedId);
}
// Compute canonicalUrl from parent canonicalUrl
var parent = this.ParentMetadataBuilder as ODataConventionalResourceMetadataBuilder;
if (this.NameAsProperty != null &&
parent != null &&
parent.GetCanonicalUrl() != null)
{
// If parent is collection of complex, the canonical url for this resource should be null.
if (parent.IsFromCollection && !(parent is ODataConventionalEntityMetadataBuilder))
{
return(this.canonicalUrl = null);
}
// canonicalUrl = parentCanonicalUrl[/typeCast]/propertyName
// Different from edit url and read url, canonical url only needs type cast when the property is defined on derived type.
this.canonicalUrl = parent.GetCanonicalUrl();
IODataResourceTypeContext typeContext = parent.ResourceMetadataContext.TypeContext;
if (parent.ResourceMetadataContext.ActualResourceTypeName != typeContext.ExpectedResourceTypeName)
{
// Do not append type cast if we know that the navigation property is in base type, not in derived type.
ODataResourceTypeContext.ODataResourceTypeContextWithModel typeContextWithModel =
typeContext as ODataResourceTypeContext.ODataResourceTypeContextWithModel;
if (typeContextWithModel == null ||
typeContextWithModel.ExpectedResourceType.FindProperty(
this.NameAsProperty) == null)
{
this.canonicalUrl = this.UriBuilder.AppendTypeSegment(canonicalUrl,
parent.ResourceMetadataContext.ActualResourceTypeName);
}
}
this.canonicalUrl = new Uri(string.Concat(this.canonicalUrl, "/", this.NameAsProperty), UriKind.RelativeOrAbsolute);
}
else
{
if (this.ODataUri != null && this.ODataUri.Path.Count != 0)
{
this.canonicalUrl = this.ODataUri.BuildUri(ODataUrlKeyDelimiter.Parentheses);
}
}
return(this.canonicalUrl);
}
private bool TryComputeIdFromParent(out Uri uri)
{
try
{
ODataConventionalResourceMetadataBuilder parent = this.ParentMetadataBuilder as ODataConventionalResourceMetadataBuilder;
if (parent != null && parent != this)
{
// Get the parent canonical url
uri = parent.GetCanonicalUrl();
if (uri != null)
{
// And append cast (if needed).
// A cast segment if the navigation property is defined on a type derived from the type expected.
IODataResourceTypeContext typeContext = parent.ResourceMetadataContext.TypeContext;
if (parent.ResourceMetadataContext.ActualResourceTypeName != typeContext.ExpectedResourceTypeName)
{
// Do not append type cast if we know that the navigation property is in base type, not in derived type.
ODataResourceTypeContext.ODataResourceTypeContextWithModel typeContextWithModel =
typeContext as ODataResourceTypeContext.ODataResourceTypeContextWithModel;
if (typeContextWithModel == null ||
typeContextWithModel.ExpectedResourceType.FindProperty(
this.ResourceMetadataContext.TypeContext.NavigationSourceName) == null)
{
uri = new Uri(UriUtils.EnsureTaillingSlash(uri),
parent.ResourceMetadataContext.ActualResourceTypeName);
}
}
return(true);
}
}
}
catch (ODataException)
{
}
uri = null;
return(false);
}