DefaultPropertyMapper Class — spring-boot Architecture

Source Code

core/spring-boot/src/main/java/org/springframework/boot/context/properties/source/DefaultPropertyMapper.java lines 36–106

final class DefaultPropertyMapper implements PropertyMapper {

	public static final PropertyMapper INSTANCE = new DefaultPropertyMapper();

	private @Nullable LastMapping<ConfigurationPropertyName, List<String>> lastMappedConfigurationPropertyName;

	private @Nullable LastMapping<String, ConfigurationPropertyName> lastMappedPropertyName;

	private DefaultPropertyMapper() {
	}

	@Override
	public List<String> map(ConfigurationPropertyName configurationPropertyName) {
		// Use a local copy in case another thread changes things
		LastMapping<ConfigurationPropertyName, List<String>> last = this.lastMappedConfigurationPropertyName;
		if (last != null && last.isFrom(configurationPropertyName)) {
			return last.getMapping();
		}
		String convertedName = configurationPropertyName.toString();
		List<String> mapping = Collections.singletonList(convertedName);
		this.lastMappedConfigurationPropertyName = new LastMapping<>(configurationPropertyName, mapping);
		return mapping;
	}

	@Override
	public ConfigurationPropertyName map(String propertySourceName) {
		// Use a local copy in case another thread changes things
		LastMapping<String, ConfigurationPropertyName> last = this.lastMappedPropertyName;
		if (last != null && last.isFrom(propertySourceName)) {
			return last.getMapping();
		}
		ConfigurationPropertyName mapping = tryMap(propertySourceName);
		this.lastMappedPropertyName = new LastMapping<>(propertySourceName, mapping);
		return mapping;
	}

	private ConfigurationPropertyName tryMap(String propertySourceName) {
		try {
			ConfigurationPropertyName convertedName = ConfigurationPropertyName.adapt(propertySourceName, '.');
			if (!convertedName.isEmpty()) {
				return convertedName;
			}
		}
		catch (Exception ex) {
			// Ignore
		}
		return ConfigurationPropertyName.EMPTY;
	}

	private static class LastMapping<T, M> {

		private final T from;

		private final M mapping;

		LastMapping(T from, M mapping) {
			this.from = from;
			this.mapping = mapping;
		}

		boolean isFrom(T from) {
			return ObjectUtils.nullSafeEquals(from, this.from);
		}

		M getMapping() {
			return this.mapping;
		}

	}

}