--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/src/java.base/unix/classes/java/net/DefaultDatagramSocketImplFactory.java	Sun Aug 17 15:54:13 2014 +0100
@@ -0,0 +1,73 @@
+/*
+ * Copyright (c) 2007,2011, 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 java.net;
+
+import java.security.AccessController;
+
+/**
+ * This class defines a factory for creating DatagramSocketImpls. It defaults
+ * to creating plain DatagramSocketImpls, but may create other DatagramSocketImpls
+ * by setting the impl.prefix system property.
+ *
+ * @author Chris Hegarty
+ */
+
+class DefaultDatagramSocketImplFactory {
+    static Class<?> prefixImplClass = null;
+
+    static {
+        String prefix = null;
+        try {
+            prefix = AccessController.doPrivileged(
+                new sun.security.action.GetPropertyAction("impl.prefix", null));
+            if (prefix != null)
+                prefixImplClass = Class.forName("java.net."+prefix+"DatagramSocketImpl");
+        } catch (Exception e) {
+            System.err.println("Can't find class: java.net." +
+                                prefix +
+                                "DatagramSocketImpl: check impl.prefix property");
+            //prefixImplClass = null;
+        }
+    }
+
+    /**
+     * Creates a new <code>DatagramSocketImpl</code> instance.
+     *
+     * @param   isMulticast     true if this impl if for a MutlicastSocket
+     * @return  a new instance of a <code>DatagramSocketImpl</code>.
+     */
+    static DatagramSocketImpl createDatagramSocketImpl(boolean isMulticast /*unused on unix*/)
+        throws SocketException {
+        if (prefixImplClass != null) {
+            try {
+                return (DatagramSocketImpl)prefixImplClass.newInstance();
+            } catch (Exception e) {
+                throw new SocketException("can't instantiate DatagramSocketImpl");
+            }
+        } else {
+            return new java.net.PlainDatagramSocketImpl();
+        }
+    }
+}