1 /* 2 * Copyright (c) 2007, 2019, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package java.net; 27 28 import sun.security.action.GetPropertyAction; 29 30 /** 31 * This class defines a factory for creating DatagramSocketImpls. It defaults 32 * to creating plain DatagramSocketImpls, but may create other DatagramSocketImpls 33 * by setting the impl.prefix system property. 34 * 35 * @author Chris Hegarty 36 */ 37 38 class DefaultDatagramSocketImplFactory { 39 static Class<?> prefixImplClass = null; 40 41 static { 42 String prefix = null; 43 try { 44 prefix = GetPropertyAction.privilegedGetProperty("impl.prefix"); 45 if (prefix != null) 46 prefixImplClass = Class.forName("java.net."+prefix+"DatagramSocketImpl"); 47 } catch (Exception e) { 48 System.err.println("Can't find class: java.net." + 49 prefix + 50 "DatagramSocketImpl: check impl.prefix property"); 51 //prefixImplClass = null; 52 } 53 } 54 55 /** 56 * Creates a new <code>DatagramSocketImpl</code> instance. 57 * 58 * @param isMulticast true if this impl if for a MutlicastSocket 59 * @return a new instance of a <code>DatagramSocketImpl</code>. 60 */ 61 static DatagramSocketImpl createDatagramSocketImpl(boolean isMulticast /*unused on unix*/) 62 throws SocketException { 63 if (prefixImplClass != null) { 64 try { 65 @SuppressWarnings("deprecation") 66 DatagramSocketImpl result = (DatagramSocketImpl)prefixImplClass.newInstance(); 67 return result; 68 } catch (Exception e) { 69 throw new SocketException("can't instantiate DatagramSocketImpl"); 70 } 71 } else { 72 return new java.net.PlainDatagramSocketImpl(isMulticast); 73 } 74 } 75 }