presto-base-jdbc/src/main/java/io/prestosql/plugin/jdbc/credential/ConfigFileBasedCredentialProvider.java/ConfigFileBasedCredentialProvider/ConfigFileBasedCredentialProvider
class ConfigFileBasedCredentialProvider:    @Inject
    public ConfigFileBasedCredentialProvider(CredentialConfig credentialsConfig)
    {
        requireNonNull(credentialsConfig, "credentialsConfig is null");
        this.connectionUser = credentialsConfig.getConnectionUser();
        this.connectionPassword = credentialsConfig.getConnectionPassword();
    }