zmacomber commented on a change in pull request #358:
ClassUtils.getBaseClasses(desiredBase, packageName)
URL: https://github.com/apache/commons-lang/pull/358#discussion_r244380194
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File path: src/main/java/org/apache/commons/lang3/ClassUtils.java
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@@ -1059,6 +1067,62 @@ public static boolean isInnerClass(final Class<?> cls) {
return getClass(loader, className, initialize);
}
+ /**
+ * Returns a list of base classes/interfaces underneath the supplied
package
+ * This method only retrieves base classes/interfaces that have children
that can be instantiated
+ * via a no-args constructor
+ * The class loader is retrieved via
Thread.currentThread().getContextClassLoader()
+ * This only retrieves base classes/interfaces directly underneath the
supplied package
+ *
+ * @param desiredBase the desired base class/interface to retrieve
+ * @param packageName the package name in the standard import format (i.e.
"java.lang.String")
+ * @param <T> The desired base class or interface type to retrieve
+ * @return a list of base classes/interfaces that match the supplied type
underneath the supplied package
+ * @throws IllegalArgumentException if the desiredBase or packageName are
invalid
+ * @throws IOException if an I/O error occurs in getting a new directory
stream
+ * @throws NullPointerException if desiredBase or url are null
+ * @throws URISyntaxException if the generated url can't be converted to a
URI
+ */
+ public static <T> List<T> getBaseClasses(final Class<T> desiredBase, final
String packageName)
+ throws IllegalArgumentException, IOException,
NullPointerException, URISyntaxException {
+
+ Objects.requireNonNull(desiredBase, "desiredBase must not be null");
+
+ if (StringUtils.isBlank(packageName)) {
+ throw new IllegalArgumentException("packageName must not be
blank");
+ }
+
+ ClassLoader classLoader =
Thread.currentThread().getContextClassLoader();
+ URL url = classLoader.getResource(packageName.replaceAll("[.]", "/"));
+ Objects.requireNonNull(url, "supplied package not found");
+
+ Path classesPath = Paths.get(url.toURI());
+
+ List<T> classes = new ArrayList<>();
+
+ try (DirectoryStream<Path> stream =
Files.newDirectoryStream(classesPath)) {
+ for (Path file: stream) {
+ Path pathFileName = file.getFileName();
+ if (( ! Files.isDirectory(file)) && (pathFileName != null)) {
+ String fullClassName = packageName + "." +
+
pathFileName.toString().replace(".class", "");
+
+ // Only add classes that can be instantiated via
newInstance()
+ try {
+ Object obj =
Class.forName(fullClassName).newInstance();
Review comment:
@ecki How is it complicated to use? The unit tests I wrote show it's
simple to use.
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