These functions provide an API to handle/retrieve data from sources.
.sources() lists all sources available in sits.
.source_check() checks if a source is available in sits.
.source_new() creates an object with a corresponding
S3 class defined in a given source.
.source_service() returns the service associated
with a given source.
.source_s3class() returns the s3 class associated
with a given source.
.source_url() get an URL associated with a source. Not
all sources have an URL. In these cases, an NA is returned.
.sources().source_check(source)
.source_new(source)
.source_service(source)
.source_s3class(source)
.source_url(source)
A character value referring to a valid data source.
The values returned by each function are described as follows.
.sources() returns a character vector
with all sources names available in sits.
.source_check() returns NULL if no error occurs.
.source_new() returns a character vector with the
S3 class defined in source's S3class attribute.
.source_service() returns a character value or
NA if no service is associated with a given source.
.source_s3class() returns a character vector.
sits uses these classes to run source functions.
.source_url() returns a character value or NA
if no URL is associated with a given source.