/// <summary>
/// Verifies that CreateEntryReader or CreateFeedReader can be called.
/// </summary>
/// <param name="entitySet">The entity set we are going to read entities for.</param>
/// <param name="entityType">The expected entity type for the entry/entries to be read.</param>
private void VerifyCanCreateODataReader(IEdmEntitySet entitySet, IEdmEntityType entityType)
{
Debug.Assert(entitySet == null || entityType != null, "If an entity set is specified, the entity type must be specified as well.");
// We require metadata information for reading requests.
if (!this.ReadingResponse)
{
this.VerifyUserModel();
if (entitySet == null)
{
throw new ODataException(ODataErrorStrings.ODataJsonLightInputContext_NoEntitySetForRequest);
}
}
// We only check that the base type of the entity set is assignable from the specified entity type.
// If no entity set/entity type is specified in the API, we will read it from the metadata URI.
IEdmEntityType entitySetElementType = this.EdmTypeResolver.GetElementType(entitySet);
if (entitySet != null && entityType != null && !entityType.IsOrInheritsFrom(entitySetElementType))
{
throw new ODataException(ODataErrorStrings.ODataJsonLightInputContext_EntityTypeMustBeCompatibleWithEntitySetBaseType(entityType.FullName(), entitySetElementType.FullName(), entitySet.FullName()));
}
}
/// <summary>
/// Resolves an entity set with an optional type cast and updates the parse result.
/// </summary>
/// <param name="entitySet">The entity set to resolve the type cast against.</param>
/// <param name="typeCast">The optional type cast.</param>
/// <param name="readerBehavior">Reader behavior if the caller is a reader, null if no reader behavior is available.</param>
/// <param name="version">The version of the payload being read.</param>
/// <param name="entitySetElementType">The type of the given entity set.</param>
/// <returns>The resolved entity type.</returns>
private IEdmEntityType ResolveTypeCast(IEdmEntitySet entitySet, string typeCast, ODataReaderBehavior readerBehavior, ODataVersion version, IEdmEntityType entitySetElementType)
{
Debug.Assert(entitySet != null, "entitySet != null");
IEdmEntityType entityType = entitySetElementType;
// Parse the type cast if it exists
if (!string.IsNullOrEmpty(typeCast))
{
EdmTypeKind typeKind;
entityType = MetadataUtils.ResolveTypeNameForRead(this.model, /*expectedType*/ null, typeCast, readerBehavior, version, out typeKind) as IEdmEntityType;
if (entityType == null)
{
throw new ODataException(ODataErrorStrings.ODataJsonLightMetadataUriParser_InvalidEntityTypeInTypeCast(UriUtilsCommon.UriToString(this.parseResult.MetadataUri), typeCast));
}
// Validate that the entity type is assignable to the base type of the set
if (!entitySetElementType.IsAssignableFrom(entityType))
{
throw new ODataException(ODataErrorStrings.ODataJsonLightMetadataUriParser_IncompatibleEntityTypeInTypeCast(UriUtilsCommon.UriToString(this.parseResult.MetadataUri), typeCast, entitySetElementType.FullName(), entitySet.FullName()));
}
}
return(entityType);
}