ResourceBundleCondition Class — spring-boot Architecture

Source Code

core/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/context/MessageSourceAutoConfiguration.java lines 113–151

	protected static class ResourceBundleCondition extends SpringBootCondition {

		private static final ConcurrentReferenceHashMap<String, ConditionOutcome> cache = new ConcurrentReferenceHashMap<>();

		@Override
		public ConditionOutcome getMatchOutcome(ConditionContext context, AnnotatedTypeMetadata metadata) {
			String basename = context.getEnvironment().getProperty("spring.messages.basename", "messages");
			ConditionOutcome outcome = cache.get(basename);
			if (outcome == null) {
				outcome = getMatchOutcomeForBasename(context, basename);
				cache.put(basename, outcome);
			}
			return outcome;
		}

		private ConditionOutcome getMatchOutcomeForBasename(ConditionContext context, String basename) {
			ConditionMessage.Builder message = ConditionMessage.forCondition("ResourceBundle");
			for (String name : StringUtils.commaDelimitedListToStringArray(StringUtils.trimAllWhitespace(basename))) {
				for (Resource resource : getResources(context.getClassLoader(), name)) {
					if (resource.exists()) {
						return ConditionOutcome.match(message.found("bundle").items(resource));
					}
				}
			}
			return ConditionOutcome.noMatch(message.didNotFind("bundle with basename " + basename).atAll());
		}

		private Resource[] getResources(@Nullable ClassLoader classLoader, String name) {
			String target = name.replace('.', '/');
			try {
				return new PathMatchingResourcePatternResolver(classLoader)
					.getResources("classpath*:" + target + ".properties");
			}
			catch (Exception ex) {
				return NO_RESOURCES;
			}
		}

	}