| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package org.apache.harmony.luni.net; |
| |
| import java.net.Inet4Address; |
| import java.net.Inet6Address; |
| import java.net.InetAddress; |
| import java.net.NetworkInterface; |
| import java.util.Enumeration; |
| |
| /** |
| * This class provides is used to pass the information required in an ip_mreq or |
| * ip6_mreq structure to java natives. We don't have accessor methods as it is |
| * more straight forward in the natives to simply access the fields directly |
| */ |
| final class GenericIPMreq { |
| |
| private InetAddress multiaddr; |
| |
| @SuppressWarnings("unused") |
| private InetAddress interfaceAddr; |
| |
| @SuppressWarnings("unused") |
| private boolean isIPV6Address; |
| |
| @SuppressWarnings("unused") |
| private int interfaceIdx; |
| |
| /** |
| * This constructor is used to create an instance of the object |
| * |
| * @param addr multicast address to join/leave |
| * |
| */ |
| GenericIPMreq(InetAddress addr) { |
| multiaddr = addr; |
| interfaceAddr = null; |
| interfaceIdx = 0; |
| init(); |
| } |
| |
| /** |
| * This constructor is used to create an instance of the object |
| * |
| * @param addr multicast address to join/leave |
| * @param netInterface the NetworkInterface object identifying the interface |
| * on which to join/leave |
| */ |
| GenericIPMreq(InetAddress addr, NetworkInterface netInterface) { |
| multiaddr = addr; |
| if (null != netInterface) { |
| // TODO check if necessary |
| //interfaceIdx = netInterface.getIndex(); |
| |
| /* |
| * here we need to get the first IPV4 address as we only use it if |
| * we are setting the interface for an IPV4 multicast socket. For |
| * adds/drops on IPV6 addresses we use the index within the |
| * networkInterface |
| */ |
| interfaceAddr = null; |
| Enumeration<InetAddress> theAddresses = netInterface.getInetAddresses(); |
| if ((addr instanceof Inet4Address) && (theAddresses != null)) { |
| boolean found = false; |
| while ((theAddresses.hasMoreElements()) && (found != true)) { |
| InetAddress theAddress = theAddresses.nextElement(); |
| if (theAddress instanceof Inet4Address) { |
| interfaceAddr = theAddress; |
| found = true; |
| } |
| } |
| } |
| } else { |
| /* |
| * network interface is null so we just want to defer the decision |
| * to the system |
| */ |
| interfaceIdx = 0; |
| interfaceAddr = null; |
| } |
| init(); |
| } |
| |
| /** |
| * This method does any required initialization for the constructors |
| */ |
| private void init() { |
| /* |
| * set the flag indicating if the multicast address is an IPV6 address |
| * or not |
| */ |
| isIPV6Address = ((multiaddr != null) && (multiaddr instanceof Inet6Address)); |
| } |
| } |