These functions provide an API to handle/retrieve data from source's collections.
.source_collections() lists all collections of a source.
.source_collection_aws() returns the aws
attribute of a collection. The attribute must define the following AWS
environment variables: AWS_DEFAULT_REGION, AWS_S3_ENDPOINT,
and AWS_REQUEST_PAYER.
.source_collection_aws_check() checks if a collection
defines aws variables.
.source_collection_check() checks if a collection
is from a source.
.source_collection_name() returns the name of a
collection in its original source.
.source_collections(source).source_access_test(source, collection, ...)
.source_collection_aws(source, collection)
.source_collection_aws_check(source, collection)
.source_collection_check(source, collection)
.source_collection_name(source, collection)
A character value referring to a valid data source.
A character value referring to a collection of the
source.
The values returned by each function are described as follows.
.source_collections() returns a character vector
with all collection names of a given source.
.source_collection_aws() returns a named list with
AWS environment variables.
.source_collection_aws_check() returns NULL if
no error occurs.
.source_collection_check() returns NULL if
no error occurs.
.source_collection_name() returns a character.