private static List getUrlsFromManifestClassPathAttribute()

in spring-boot-project/spring-boot-devtools/src/main/java/org/springframework/boot/devtools/restart/ChangeableUrls.java [142:180]

39 lines of code
8 McCabe index (conditional complexity)


	private static List<URL> getUrlsFromManifestClassPathAttribute(URL jarUrl, JarFile jarFile) throws IOException {
		Manifest manifest = jarFile.getManifest();
		if (manifest == null) {
			return Collections.emptyList();
		}
		String classPath = manifest.getMainAttributes().getValue(Attributes.Name.CLASS_PATH);
		if (!StringUtils.hasText(classPath)) {
			return Collections.emptyList();
		}
		String[] entries = StringUtils.delimitedListToStringArray(classPath, " ");
		List<URL> urls = new ArrayList<>(entries.length);
		List<URL> nonExistentEntries = new ArrayList<>();
		for (String entry : entries) {
			try {
				URL referenced = new URL(jarUrl, entry);
				if (new File(referenced.getFile()).exists()) {
					urls.add(referenced);
				}
				else {
					referenced = new URL(jarUrl, URLDecoder.decode(entry, "UTF-8"));
					if (new File(referenced.getFile()).exists()) {
						urls.add(referenced);
					}
					else {
						nonExistentEntries.add(referenced);
					}
				}
			}
			catch (MalformedURLException ex) {
				throw new IllegalStateException("Class-Path attribute contains malformed URL", ex);
			}
		}
		if (!nonExistentEntries.isEmpty()) {
			logger.info(LogMessage.of(() -> "The Class-Path manifest attribute in " + jarFile.getName()
					+ " referenced one or more files that do not exist: "
					+ StringUtils.collectionToCommaDelimitedString(nonExistentEntries)));
		}
		return urls;
	}