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**** BEGIN LICENSE BLOCK ***** Version: CPL 1.0/GPL 2.0/LGPL 2.1 The contents of this file are subject to the Common Public License Version 1.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at Software distributed under the License is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for the specific language governing rights and limitations under the License. Copyright (C) 2009 Yoko Harada <> Alternatively, the contents of this file may be used under the terms of either of the GNU General Public License Version 2 or later (the "GPL"), or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"), in which case the provisions of the GPL or the LGPL are applicable instead of those above. If you wish to allow use of your version of this file only under the terms of either the GPL or the LGPL, and not to allow others to use your version of this file under the terms of the CPL, indicate your decision by deleting the provisions above and replace them with the notice and other provisions required by the GPL or the LGPL. If you do not delete the provisions above, a recipient may use your version of this file under the terms of any one of the CPL, the GPL or the LGPL. **** END LICENSE BLOCK *****
 package org.jruby.embed.jsr223;
 import java.util.List;
Finds SPI based services from classpath.

Yoko Harada <>
 class ServiceFinder {
     private ClassLoader loader = null;
     private String serviceName;
     private HashSet<?> services;
     ServiceFinder(ClassLoader loaderString serviceNamethrows IOException {
         this. = serviceName;
         Enumeration<URLurls = findResources(loader);
         List<StringclassNames = getClassNames(urls);
          = instantiateClasses(classNames);
     HashSet<?> getServices() {
         return ;
     private Enumeration<URLfindResources(ClassLoader loaderthrows IOException {
         if (loader == null) {
             this. = ClassLoader.getSystemClassLoader();
             urls = ClassLoader.getSystemResources();
         } else {
             this. = loader;
             urls = loader.getResources();
         return urls;
     private List<StringgetClassNames(Enumeration<URLurls) {
         String encoding = System.getProperty("file.encoding");
         List<Stringnames = new ArrayList();
         URL url = null;
         while (urls.hasMoreElements()) {
             try {
             url = urls.nextElement();
             BufferedReader reader =
                     new BufferedReader(new InputStreamReader(url.openStream(), encoding));
             String line;
             while ((line = reader.readLine()) != null) {
                 if ((line = deleteComments(line)) != null) {
             } catch (IOException e) {
                 ..println("Failed to get a class name from " + url.toString());
         return names;
     private String deleteComments(String line) {
         if (line.startsWith("#")) {
            return null;
        if (line.length() < 1) {
            return null;
        StringTokenizer st = new StringTokenizer(line"#");
        return ((Stringst.nextElement()).trim();
    private <T> HashSet<T> instantiateClasses(List<Stringnames) {
        HashSet<T> instances = new HashSet<T>();
        for (String name : names) {
            try {
                Class clazz = Class.forName(nametrue);
                T instance = (T) clazz.newInstance();
            } catch (ClassNotFoundException e) {
                ..println(name + " was not found");
            } catch (InstantiationException e) {
                ..println(name + " was not instantiated");
            } catch (IllegalAccessException e) {
                ..println(name + " committed illegal access");
            } catch (Throwable e) {
                ..println("failed to instantiate " + name);
        return instances;
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