Returns a (possibly empty) collection view of X.509 certificates read from the given input stream <code>is</code>.
@param stream the input stream with the certificates.
@return a (possibly empty) collection view of X.509 certificate objects initialized with the data from the input stream.
@exception CertificateException on parsing errors.
See Implementation
Returns a (possibly empty) collection view of X.509 certificates read from the given input stream <code>is</code>.
@param stream the input stream with the certificates.
@return a (possibly empty) collection view of X.509 certificate objects initialized with the data from the input stream.
@exception CertificateException on parsing errors.