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