Optional Readonly matchesETagValid if matching any of the given ETags.
Optional Readonly modifiedValid if modified since the given date.
Optional Readonly notValid if not matching any of the given ETags.
Optional Readonly unmodifiedValid if not modified since the given date.
Checks validity based on the given ETag and/or date.
This function assumes the resource being checked exists.
If not, the matchesMetadata function should be used.
Optional eTag: stringCondition based on ETag.
Optional lastModified: DateCondition based on last modified date.
Checks validity based on the given metadata.
Optional metadata: RepresentationMetadataMetadata of the representation. Undefined if the resource does not exist.
Stores all the relevant Conditions values and matches them based on RFC7232.