private static Map<String, Object> getSourceMap(String group, String dataId,
			List<PropertySource<?>> propertySources) {
		if (CollectionUtils.isEmpty(propertySources)) {
			return Collections.emptyMap();
		}
		// If only one, return the internal element, otherwise wrap it.
		if (propertySources.size() == 1) {
			PropertySource propertySource = propertySources.get(0);
			if (propertySource != null && propertySource.getSource() instanceof Map source) {
				return source;
			}
		}

		Map<String, Object> sourceMap = new LinkedHashMap<>();
		List<PropertySource<?>> otherTypePropertySources = new ArrayList<>();
		for (PropertySource<?> propertySource : propertySources) {
			if (propertySource == null) {
				continue;
			}
			if (propertySource instanceof MapPropertySource mapPropertySource) {
				// If the Nacos configuration file uses "---" to separate property name,
				// propertySources will be multiple documents, and every document is a
				// map.
				// see org.springframework.boot.env.YamlPropertySourceLoader#load
				Map<String, Object> source = mapPropertySource.getSource();
				sourceMap.putAll(source);
			}
			else {
				otherTypePropertySources.add(propertySource);
			}
		}

		// Other property sources which is not instanceof MapPropertySource will be put as
		// it is,
		// and the internal elements cannot be directly retrieved,
		// so the user needs to implement the retrieval logic by himself
		if (!otherTypePropertySources.isEmpty()) {
			sourceMap.put(String.join(NacosConfigProperties.COMMAS, dataId, group),
					otherTypePropertySources);
		}
		return sourceMap;
	}
Whether to support dynamic refresh for this Property Source.
spring-cloud-alibaba-starters/spring-alibaba-nacos-config/src/main/java/com/alibaba/cloud/nacos/client/NacosPropertySource.java