'Return the set of imports under the given prefix.
"prefix" is a tuple of import name parts. E.g. ("xml", "sax")
for "import xml.sax." in Python. Or ("XML", "Parser") for
"use XML::Parser::" in Perl.
See description in database.py docstring for details.'

def get_blob_imports(self, prefix):

    if (prefix not in self._blob_imports_from_prefix_cache):
        matches = filter_blobnames_for_prefix(self.blob_index, prefix, self.import_handler.sep)
        self._blob_imports_from_prefix_cache[prefix] = matches
    return self._blob_imports_from_prefix_cache[prefix]
