private String[] getQualifiers(final Map<String, Object> client) {
        if (Objects.isNull(client)) {
            return null;
        }
        List<String> qualifierList = new ArrayList<>(Arrays.asList((String[]) client.get("qualifiers")));
        qualifierList.removeIf(qualifier -> StringUtils.isBlank(qualifier));
        if (CollectionUtils.isEmpty(qualifierList) && StringUtils.isNotBlank(getQualifier(client))) {
            qualifierList = Collections.singletonList(getQualifier(client));
        }
        return CollectionUtils.isNotEmpty(qualifierList) ? qualifierList.toArray(new String[0]) : null;
    }
Gets base packages.

@param importingClassMetadata the importing class metadata
@return the base packages
shenyu-sdk/shenyu-sdk-spring/src/main/java/org/apache/shenyu/sdk/spring/ShenyuClientsRegistrar.java