Read-only Zarr-backed Daf class. — ZarrDafReadOnly • dafr

Concrete DafReadOnly subclass instantiated by zarr_daf() when opened with mode "r". All mutating format_* generics reject calls on this class with a clear "store opened read-only" error.

Usage

ZarrDafReadOnly(
  name = character(0),
  internal = new.env(parent = emptyenv()),
  cache = new.env(parent = emptyenv()),
  axis_version_counter = new.env(parent = emptyenv()),
  vector_version_counter = new.env(parent = emptyenv()),
  matrix_version_counter = new.env(parent = emptyenv()),
  store = ZarrStore()
)

Arguments

name: Human-readable identifier for the Daf store.
internal: Internal per-store environment used by format backends to stash backend-specific state; reserved for package use.
cache: Three-tier cache environment (mapped / memory / query). See new_cache_env().
axis_version_counter: Environment tracking per-axis mutation counters; invalidates cached reads when an axis is modified.
vector_version_counter: Environment tracking per-vector mutation counters.
matrix_version_counter: Environment tracking per-matrix mutation counters.
store: Internal ZarrStore instance (set by zarr_daf()); not intended for direct use.

Examples

if (FALSE) { # \dontrun{
d <- zarr_daf("/path/to/existing.daf.zarr", mode = "r")
inherits(d, "dafr::ZarrDafReadOnly")
} # }