Thu, 31 Aug 2017 15:18:52 +0800
merge
aoqi@0 | 1 | /* |
aoqi@0 | 2 | * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved. |
aoqi@0 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
aoqi@0 | 4 | * |
aoqi@0 | 5 | * This code is free software; you can redistribute it and/or modify it |
aoqi@0 | 6 | * under the terms of the GNU General Public License version 2 only, as |
aoqi@0 | 7 | * published by the Free Software Foundation. Oracle designates this |
aoqi@0 | 8 | * particular file as subject to the "Classpath" exception as provided |
aoqi@0 | 9 | * by Oracle in the LICENSE file that accompanied this code. |
aoqi@0 | 10 | * |
aoqi@0 | 11 | * This code is distributed in the hope that it will be useful, but WITHOUT |
aoqi@0 | 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
aoqi@0 | 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
aoqi@0 | 14 | * version 2 for more details (a copy is included in the LICENSE file that |
aoqi@0 | 15 | * accompanied this code). |
aoqi@0 | 16 | * |
aoqi@0 | 17 | * You should have received a copy of the GNU General Public License version |
aoqi@0 | 18 | * 2 along with this work; if not, write to the Free Software Foundation, |
aoqi@0 | 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
aoqi@0 | 20 | * |
aoqi@0 | 21 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
aoqi@0 | 22 | * or visit www.oracle.com if you need additional information or have any |
aoqi@0 | 23 | * questions. |
aoqi@0 | 24 | */ |
aoqi@0 | 25 | |
aoqi@0 | 26 | package com.sun.xml.internal.org.jvnet.mimepull; |
aoqi@0 | 27 | |
aoqi@0 | 28 | import java.io.BufferedReader; |
aoqi@0 | 29 | import java.io.IOException; |
aoqi@0 | 30 | import java.io.InputStream; |
aoqi@0 | 31 | import java.io.InputStreamReader; |
aoqi@0 | 32 | import java.util.logging.Level; |
aoqi@0 | 33 | import java.util.logging.Logger; |
aoqi@0 | 34 | |
aoqi@0 | 35 | class FactoryFinder { |
aoqi@0 | 36 | |
aoqi@0 | 37 | private static ClassLoader cl = FactoryFinder.class.getClassLoader(); |
aoqi@0 | 38 | |
aoqi@0 | 39 | static Object find(String factoryId) throws ClassNotFoundException, |
aoqi@0 | 40 | InstantiationException, IllegalAccessException { |
aoqi@0 | 41 | String systemProp = System.getProperty(factoryId); |
aoqi@0 | 42 | if (systemProp != null) { |
aoqi@0 | 43 | return newInstance(systemProp); |
aoqi@0 | 44 | } |
aoqi@0 | 45 | |
aoqi@0 | 46 | String providerName = findJarServiceProviderName(factoryId); |
aoqi@0 | 47 | if (providerName != null && providerName.trim().length() > 0) { |
aoqi@0 | 48 | return newInstance(providerName); |
aoqi@0 | 49 | } |
aoqi@0 | 50 | |
aoqi@0 | 51 | return null; |
aoqi@0 | 52 | } |
aoqi@0 | 53 | |
aoqi@0 | 54 | static Object newInstance(String className) throws ClassNotFoundException, |
aoqi@0 | 55 | InstantiationException, IllegalAccessException { |
aoqi@0 | 56 | Class providerClass = cl.loadClass(className); |
aoqi@0 | 57 | Object instance = providerClass.newInstance(); |
aoqi@0 | 58 | return instance; |
aoqi@0 | 59 | } |
aoqi@0 | 60 | |
aoqi@0 | 61 | private static String findJarServiceProviderName(String factoryId) { |
aoqi@0 | 62 | String serviceId = "META-INF/services/" + factoryId; |
aoqi@0 | 63 | InputStream is; |
aoqi@0 | 64 | is = cl.getResourceAsStream(serviceId); |
aoqi@0 | 65 | |
aoqi@0 | 66 | if (is == null) { |
aoqi@0 | 67 | return null; |
aoqi@0 | 68 | } |
aoqi@0 | 69 | |
aoqi@0 | 70 | String factoryClassName; |
aoqi@0 | 71 | BufferedReader rd = null; |
aoqi@0 | 72 | try { |
aoqi@0 | 73 | try { |
aoqi@0 | 74 | rd = new BufferedReader(new InputStreamReader(is, "UTF-8")); |
aoqi@0 | 75 | } catch (java.io.UnsupportedEncodingException e) { |
aoqi@0 | 76 | rd = new BufferedReader(new InputStreamReader(is)); |
aoqi@0 | 77 | } |
aoqi@0 | 78 | try { |
aoqi@0 | 79 | factoryClassName = rd.readLine(); |
aoqi@0 | 80 | } catch (IOException x) { |
aoqi@0 | 81 | return null; |
aoqi@0 | 82 | } |
aoqi@0 | 83 | } finally { |
aoqi@0 | 84 | if (rd != null) { |
aoqi@0 | 85 | try { |
aoqi@0 | 86 | rd.close(); |
aoqi@0 | 87 | } catch (IOException ex) { |
aoqi@0 | 88 | Logger.getLogger(FactoryFinder.class.getName()).log(Level.INFO, null, ex); |
aoqi@0 | 89 | } |
aoqi@0 | 90 | } |
aoqi@0 | 91 | } |
aoqi@0 | 92 | |
aoqi@0 | 93 | return factoryClassName; |
aoqi@0 | 94 | } |
aoqi@0 | 95 | |
aoqi@0 | 96 | } |