Constraints¶

class lsst.daf.butler.Constraints(config, *, universe)¶

Determine whether a DatasetRef, DatasetType, or StorageClass is allowed to be handled.

Parameters:	config : `ConstraintsConfig` or `str` Load configuration. If `None` then this is equivalent to having no restrictions. universe : `DimensionUniverse` The set of all known dimensions, used to normalize any lookup keys involving dimensions.

Attributes Summary

matchAllKey Configuration key associated with matching everything.

Methods Summary

`getLookupKeys`()	Retrieve the look up keys for all the constraints entries.
`isAcceptable`(entity)	Check whether the supplied entity will be acceptable to whatever this `Constraints` class is associated with.

Attributes Documentation

matchAllKey = LookupKey(name='all',)¶: Configuration key associated with matching everything.

Methods Documentation

getLookupKeys()¶

Retrieve the look up keys for all the constraints entries.

Returns:	keys : `set` of `LookupKey` The keys available for determining constraints. Does not include the special “all” lookup key.

isAcceptable(entity)¶

Check whether the supplied entity will be acceptable to whatever this Constraints class is associated with.

Parameters:	entity : `DatasetType`, `DatasetRef`, or `StorageClass` Instance to use to look in constraints table. The entity itself reports the `LookupKey` that is relevant.
Returns:	allowed : `bool` `True` if the entity is allowed.