/// <summary>
/// Parse the given uri text.
/// Try to parse with a specific Uri literal parser registered for the target EdmType.
/// If no parser is registered, try to parse with the general parsers.
/// This method is public because of the Interface, but the Singleton instance in internal so it could not be accessed by clients.
/// </summary>
/// <param name="text">Part of the Uri which has to be parsed to a value of EdmType <paramref name="targetType"/></param>
/// <param name="targetType">The type which the uri text has to be parsed to</param>
/// <param name="parsingException">Assign the exception only in case the text could be parsed to the <paramref name="targetType"/> but failed during the parsing process</param>
/// <returns>If parsing process has succeeded, returns the parsed object, otherwise returns 'Null'</returns>
public object ParseUriStringToType(string text, IEdmTypeReference targetType, out UriLiteralParsingException parsingException)
{
IUriLiteralParser uriLiteralParserForEdmType = CustomUriLiteralParsers.GetUriLiteralParserByEdmType(targetType);
// Search for Uri literal parser which is registered for the given EdmType
if (uriLiteralParserForEdmType != null)
{
return(uriLiteralParserForEdmType.ParseUriStringToType(text, targetType, out parsingException));
}
// Parse with all the general parsers
// Stop when a parser succeeded parsing the text.
IUriLiteralParser[] localCustomUriLiteralParsers = CustomUriLiteralParsers.customUriLiteralParsers;
foreach (IUriLiteralParser customUriLiteralParser in localCustomUriLiteralParsers)
{
// Try to parse
object targetValue = customUriLiteralParser.ParseUriStringToType(text, targetType, out parsingException);
// The uriCustomParser could parse the given targetType but failed during the parsing process
if (parsingException != null)
{
return(null);
}
// In case of no exception and no value - The parse cannot parse the given text
if (targetValue != null)
{
return(targetValue);
}
}
// No uriCustomParser could parse the requested uri text.
parsingException = null;
return(null);
}
/// <summary>
/// Add a custom 'IUriLiteralParser' which will be called to parse a value of the given EdmType during the UriParsing process.
/// </summary>
/// <param name="edmTypeReference">The EdmType the Uri literal parser can parse.</param>
/// <param name="customUriLiteralParser">The custom uri type parser to add.</param>
/// <exception cref="ArgumentNullException"><paramref name="customUriLiteralParser"/> is null.</exception>
/// <exception cref="ArgumentNullException"><paramref name="edmTypeReference"/> is null.</exception>
/// <exception cref="ODataException">Another Uri literal parser is already registered for the given EdmType</exception>
public static void AddCustomUriLiteralParser(IEdmTypeReference edmTypeReference, IUriLiteralParser customUriLiteralParser)
{
ExceptionUtils.CheckArgumentNotNull(edmTypeReference, "edmTypeReference");
ExceptionUtils.CheckArgumentNotNull(customUriLiteralParser, "customUriLiteralParser");
lock (CustomUriLiteralParsers.Locker)
{
if (CustomUriLiteralParsers.IsEdmTypeAlreadyRegistered(edmTypeReference))
{
throw new ODataException(ODataErrorStrings.UriCustomTypeParsers_AddCustomUriTypeParserEdmTypeExists(edmTypeReference.FullName()));
}
CustomUriLiteralParsers.customUriLiteralParserPerEdmType = CustomUriLiteralParsers.customUriLiteralParserPerEdmType.Concat(
new UriLiteralParserPerEdmType[]
{
new UriLiteralParserPerEdmType
{
EdmTypeOfUriParser = edmTypeReference,
UriLiteralParser = customUriLiteralParser
}
})
.ToArray();
}
}
