Support persistence of FilterLabel.

The Exposure.filter component remains as Filter for API compatibility.
Filter information will be migrated to the FilterLabel class over
DM-27170 and DM-27177, then migrated back to the filter component
over DM-27177 and DM-27811.

python/lsst/daf/butler/configs/datastores/formatters.yaml

@@ -13,6 +13,7 @@ CoaddInputs: lsst.obs.base.formatters.fitsGeneric.FitsGenericFormatter
 VisitInfo: lsst.obs.base.formatters.fitsGeneric.FitsGenericFormatter
 ApCorr: lsst.obs.base.formatters.fitsGeneric.FitsGenericFormatter
 PhotoCalib: lsst.obs.base.formatters.fitsGeneric.FitsGenericFormatter
+FilterLabel: lsst.obs.base.formatters.fitsGeneric.FitsGenericFormatter
 TransmissionCurve: lsst.obs.base.formatters.fitsGeneric.FitsGenericFormatter
 Camera: lsst.obs.base.formatters.fitsGeneric.FitsGenericFormatter
 Detector: lsst.obs.base.formatters.fitsGeneric.FitsGenericFormatter
@@ -60,5 +61,6 @@ MetricValue:
     unsafe_dump: true
 BrighterFatterKernel: lsst.daf.butler.formatters.pickle.PickleFormatter
 StructuredDataDict: lsst.daf.butler.formatters.yaml.YamlFormatter
+# TODO: remove Filter in DM-27177
 Filter: lsst.obs.base.formatters.filter.FilterFormatter
 Stamps: lsst.obs.base.formatters.fitsGeneric.FitsGenericFormatter

python/lsst/daf/butler/configs/storageClasses.yaml

@@ -103,8 +103,13 @@ storageClasses:
     pytype: lsst.meas.algorithms.Curve
   CrosstalkCalib:
     pytype: lsst.ip.isr.CrosstalkCalib
+  # TODO: remove Filter in DM-27177
   Filter:
     pytype: lsst.afw.image.Filter
+  FilterLabel:
+    pytype: lsst.afw.image.FilterLabel
+    # To support exposure.filter; remove in DM-27177
+    delegate: lsst.obs.base.formatters.filter.FilterTranslator
   Exposure:
     pytype: lsst.afw.image.Exposure
     delegate: lsst.obs.base.exposureAssembler.ExposureAssembler
@@ -123,13 +128,16 @@ storageClasses:
       coaddInputs: CoaddInputs
       transmissionCurve: TransmissionCurve
       metadata: PropertyList
-      filter: Filter
+      # TODO: for consistency with Exposure.getFilterLabel(). Deprecate in DM-27177, remove in DM-27811.
+      filterLabel: FilterLabel
       detector: Detector
       validPolygon: Polygon
     derivedComponents:
       bbox: Box2I
       dimensions: Extent2I
       xy0: Point2I
+      # TODO: change filter to FilterLabel and make non-derived in DM-27177. This is a breaking change.
+      filter: Filter
   ExposureF:
     inheritsFrom: Exposure
     pytype: lsst.afw.image.ExposureF