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