ohair@286: /*
alanb@368:  * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.
ohair@286:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
ohair@286:  *
ohair@286:  * This code is free software; you can redistribute it and/or modify it
ohair@286:  * under the terms of the GNU General Public License version 2 only, as
ohair@286:  * published by the Free Software Foundation.  Oracle designates this
ohair@286:  * particular file as subject to the "Classpath" exception as provided
ohair@286:  * by Oracle in the LICENSE file that accompanied this code.
ohair@286:  *
ohair@286:  * This code is distributed in the hope that it will be useful, but WITHOUT
ohair@286:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
ohair@286:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
ohair@286:  * version 2 for more details (a copy is included in the LICENSE file that
ohair@286:  * accompanied this code).
ohair@286:  *
ohair@286:  * You should have received a copy of the GNU General Public License version
ohair@286:  * 2 along with this work; if not, write to the Free Software Foundation,
ohair@286:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
ohair@286:  *
ohair@286:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
ohair@286:  * or visit www.oracle.com if you need additional information or have any
ohair@286:  * questions.
ohair@286:  */
ohair@286: 
ohair@286: package com.sun.xml.internal.org.jvnet.mimepull;
ohair@286: 
ohair@286: import java.io.BufferedReader;
ohair@286: import java.io.IOException;
ohair@286: import java.io.InputStream;
ohair@286: import java.io.InputStreamReader;
alanb@368: import java.util.logging.Level;
alanb@368: import java.util.logging.Logger;
ohair@286: 
ohair@286: class FactoryFinder {
ohair@286: 
ohair@286:     private static ClassLoader cl = FactoryFinder.class.getClassLoader();
ohair@286: 
ohair@286:     static Object find(String factoryId) throws ClassNotFoundException,
ohair@286:             InstantiationException, IllegalAccessException {
ohair@286:         String systemProp = System.getProperty(factoryId);
ohair@286:         if (systemProp != null) {
ohair@286:             return newInstance(systemProp);
ohair@286:         }
ohair@286: 
ohair@286:         String providerName = findJarServiceProviderName(factoryId);
ohair@286:         if (providerName != null && providerName.trim().length() > 0) {
ohair@286:             return newInstance(providerName);
ohair@286:         }
ohair@286: 
ohair@286:         return null;
ohair@286:     }
ohair@286: 
ohair@286:     static Object newInstance(String className) throws ClassNotFoundException,
ohair@286:             InstantiationException, IllegalAccessException {
ohair@286:         Class providerClass = cl.loadClass(className);
ohair@286:         Object instance = providerClass.newInstance();
ohair@286:         return instance;
ohair@286:     }
ohair@286: 
ohair@286:     private static String findJarServiceProviderName(String factoryId) {
ohair@286:         String serviceId = "META-INF/services/" + factoryId;
alanb@368:         InputStream is;
ohair@286:         is = cl.getResourceAsStream(serviceId);
ohair@286: 
ohair@286:         if (is == null) {
ohair@286:             return null;
ohair@286:         }
ohair@286: 
alanb@368:         String factoryClassName;
alanb@368:         BufferedReader rd = null;
ohair@286:         try {
alanb@368:             try {
alanb@368:                 rd = new BufferedReader(new InputStreamReader(is, "UTF-8"));
alanb@368:             } catch (java.io.UnsupportedEncodingException e) {
alanb@368:                 rd = new BufferedReader(new InputStreamReader(is));
alanb@368:             }
alanb@368:             try {
alanb@368:                 factoryClassName = rd.readLine();
alanb@368:             } catch (IOException x) {
alanb@368:                 return null;
alanb@368:             }
alanb@368:         } finally {
alanb@368:             if (rd != null) {
alanb@368:                 try {
alanb@368:                     rd.close();
alanb@368:                 } catch (IOException ex) {
alanb@368:                     Logger.getLogger(FactoryFinder.class.getName()).log(Level.INFO, null, ex);
alanb@368:                 }
alanb@368:             }
ohair@286:         }
ohair@286: 
ohair@286:         return factoryClassName;
ohair@286:     }
ohair@286: 
ohair@286: }