public static bool IsDirectiveAttribute(this RequiredAttributeDescriptor descriptor)
{
if (descriptor == null)
{
throw new ArgumentNullException(nameof(descriptor));
}
return
(descriptor.Metadata.TryGetValue(ComponentMetadata.Common.DirectiveAttribute, out var value) &&
string.Equals(bool.TrueString, value));
}
// Internal for testing
internal static bool SatisfiesRequiredAttribute(string attributeName, string attributeValue, RequiredAttributeDescriptor descriptor)
{
var nameMatches = false;
if (descriptor.NameComparison == RequiredAttributeDescriptor.NameComparisonMode.FullMatch)
{
nameMatches = string.Equals(descriptor.Name, attributeName, StringComparison.OrdinalIgnoreCase);
}
else if (descriptor.NameComparison == RequiredAttributeDescriptor.NameComparisonMode.PrefixMatch)
{
// attributeName cannot equal the Name if comparing as a PrefixMatch.
nameMatches = attributeName.Length != descriptor.Name.Length &&
attributeName.StartsWith(descriptor.Name, StringComparison.OrdinalIgnoreCase);
}
else
{
Debug.Assert(false, "Unknown name comparison.");
}
if (!nameMatches)
{
return(false);
}
switch (descriptor.ValueComparison)
{
case RequiredAttributeDescriptor.ValueComparisonMode.None:
return(true);
case RequiredAttributeDescriptor.ValueComparisonMode.PrefixMatch: // Value starts with
return(attributeValue.StartsWith(descriptor.Value, StringComparison.Ordinal));
case RequiredAttributeDescriptor.ValueComparisonMode.SuffixMatch: // Value ends with
return(attributeValue.EndsWith(descriptor.Value, StringComparison.Ordinal));
case RequiredAttributeDescriptor.ValueComparisonMode.FullMatch: // Value equals
return(string.Equals(attributeValue, descriptor.Value, StringComparison.Ordinal));
default:
Debug.Assert(false, "Unknown value comparison.");
return(false);
}
}
