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POJava, Get all classes available to a URLClassLoader that implement a specific interface
 

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    <p>I am working on a command line app that loads user specified text translators at runtime (path to class files/jar provided via command line arg). Basically I am taking that argument and using it to create a URLClassLoader. Then I need to find all classes available to the URLClassloader that implement the Transable interface.</p> <p>Right now I am only allowing this command line arg to be a directory with class files in it. Making the solution fairly simple (code below). But honestly I don't like the solution as it breaks down for jar files, directory of jar files, etc... Also, this obviously breaks down for any classes with a defined package, as loadClass needs the full name including the package. Anyone have a better method?</p> <pre><code> File d = new File(path); if(d.isDirectory()) { URL url = d.toURI().toURL(); ClassLoader cl = new URLClassLoader(new URL[]{url}); FilenameFilter filter = new FilenameFilter() { @Override public boolean accept(File dir, String name) { return name.endsWith(".class"); } }; for(File f : d.listFiles(filter)) { String name = f.getName().substring(0, f.getName().indexOf(".")); String key = ""; if(name.endsWith("Translator")) { key = name.substring(0, name.indexOf("Translator")); } else if(name.endsWith("translator")) { key = name.substring(0, name.indexOf("translator")); } else key = name; Class c = cl.loadClass(name); if(Transable.class.isAssignableFrom(c)) { Transable t = (Transable)c.newInstance(); env.registerTranslator(key, t); } else { System.out.println("[ClassLoader] "+c.getCanonicalName()+" will not be loaded. It is not a translator class"); } } } else { throw new Error("NOT IMPLEMENTED"); } </code></pre>
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    1. COjust go in the jar file and check all entries.
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