Using wildcards for spring MessageSources

by Emil Korladinov 

Overview 

Recently I worked on a Spring project which uses a lot of property files located all over the source tree. The requirement is to use these property files as part of the messageSource configured by Spring Framework.After dome time spent in searching suitable solution, I came up with a custom solution which I want to share with all interested.

Wildcard enabled Spring message source

	public class WildcardReloadableResourceBundleMessageSource extends
	org.springframework.context.support.ReloadableResourceBundleMessageSource {
	private ResourcePatternResolver resourcePatternResolver = new PathMatchingResourcePatternResolver();
	@Override
	public void setBasenames(String... basenames) {
	if (basenames != null) {
	List<String> baseNames = new ArrayList<String>();
	for (int i = 0; i < basenames.length; i++) {
	String basename = trimToEmpty(basenames[i]);
	if (isNotBlank(basename)) {
	try {
	Resource[] resources = resourcePatternResolver.getResources(basename);
	for (int j = 0; j < resources.length; j++) {
	Resource resource = resources[j];
	String uri = resource.getURI().toString();
	String baseName = null;
	if (resource instanceof FileSystemResource) {
	baseName = "classpath:" + substringBetween(uri, "/classes/", ".properties");
	} else if (resource instanceof ClassPathResource) {
	baseName = substringBefore(uri, ".properties");
	} else if (resource instanceof UrlResource) {
	baseName = "classpath:" + substringBetween(uri, ".jar!/", ".properties");
	}
	if (baseName != null) {
	String fullName = processBasename(baseName);
	baseNames.add(fullName);
	}
	}
	} catch (IOException e) {
	logger.debug("No message source files found for basename " + basename + ".");
	}
	}
	String[] resourceBasenames = Op.onList(baseNames).toSet().toArrayOf(Types.STRING).get();
	super.setBasenames(resourceBasenames);
	}
	}
	}
	String processBasename(String baseName) {
	String prefix = substringBeforeLast(baseName, "/");
	String name = substringAfterLast(baseName, "/");
	do {
	name = substringBeforeLast(name, "_");
	} while (name.contains("_"));
	return prefix + "/" + name;
	}
	}

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XML Configuration

	<?xml version="1.0" encoding="UTF-8"?>
	<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://www.springframework.org/schema/beans
	http://www.springframework.org/schema/beans/spring-beans.xsd">
	<bean id="messageSource"
	class="co.jware.spring.WildcardReloadableResourceBundleMessageSource">
	<property name="basenames">
	<array>
	<value>classpath*:**/msg-*</value>
	<value>classpath*:**/label-*</value>
	</array>
	</property>
	</bean>
	</beans>

view raw application-context.xml hosted with ❤ by GitHub

Java Configuration

	@Bean(name = "messageSource")
	public ReloadableResourceBundleMessageSource resourceBundleMessageSource() {
	WildcardReloadableResourceBundleMessageSource messageSource =
	new WildcardReloadableResourceBundleMessageSource();
	String[] baseNames = StringUtils.commaDelimitedListToStringArray("classpath*:**/label-*");
	messageSource.setBasenames(baseNames);
	return messageSource;
	}

view raw SpringConfig.java hosted with ❤ by GitHub