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### =========================================================================
### CacheInfo class
### -------------------------------------------------------------------------
setClass("CacheInfo",
representation(expires = "POSIXt",
lastModified = "POSIXt",
hash = "character_OR_NULL"))
CacheInfo <- function(expires = Sys.time(),
lastModified = as.POSIXct("1960-01-01"),
hash = NULL)
{
if (!is.null(hash) && !isSingleString(hash))
stop("If not NULL, 'hash' must be a single, non-NA string")
new("CacheInfo", expires = expires, lastModified = lastModified, hash = hash)
}
setGeneric("expired", function(x, ...) standardGeneric("expired"))
setMethod("expired", "CacheInfo", function(x) {
x@expires < Sys.time()
})
setGeneric("modifiedSince",
function(x, date, ...) standardGeneric("modifiedSince"))
setMethod("modifiedSince", c("CacheInfo", "Date"), function(x, date) {
x@lastModified >= date
})
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