R/findCache.R

In HenrikBengtsson/aroma.seq: High-Throughput Sequence Analysis using the Aroma Framework

.findCache <- local({
  db <- new.env(parent=emptyenv())

  getKey <- function(name, version=NULL) {
    if (!is.null(version)) {
      version <- as.character(version)
      version <- rep(version, length.out=2L)
      name <- sprintf("%s;version=[%s,%s]", name, version[1L], version[2L])
    }
    name
  } # getKey()

  function(name, version=NULL, path, ...) {
    if (missing(path)) {
      if (missing(name)) {
        return(as.list(db))
      }
      key <- getKey(name, version=version)
      res <- db[[key]]
      if (!is.null(res) || !is.null(version)) {
        return(res)
      }
      # Find all possible matches
      pattern <- sprintf("^%s;version=", key)
      res <- as.list(db)
      keys <- grep(pattern, names(res))
      res <- res[keys]
      if (length(res) == 0L) res <- NULL
      return(res)
    } else {
      key <- getKey(name, version=version)
      db[[key]] <- list(key=key, name=name, version=version, path=path)
    }
    invisible(NULL)
  }
}) # .findCache()