001: /*
002: * Licensed to the Apache Software Foundation (ASF) under one or more
003: * contributor license agreements. See the NOTICE file distributed with
004: * this work for additional information regarding copyright ownership.
005: * The ASF licenses this file to You under the Apache License, Version 2.0
006: * (the "License"); you may not use this file except in compliance with
007: * the License. You may obtain a copy of the License at
008: *
009: * http://www.apache.org/licenses/LICENSE-2.0
010: *
011: * Unless required by applicable law or agreed to in writing, software
012: * distributed under the License is distributed on an "AS IS" BASIS,
013: * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014: * See the License for the specific language governing permissions and
015: * limitations under the License.
016: */
017:
018: package org.apache.harmony.luni.net;
019:
020: import java.net.Inet4Address;
021: import java.net.Inet6Address;
022: import java.net.InetAddress;
023: import java.net.NetworkInterface;
024: import java.util.Enumeration;
025:
026: /**
027: * This class provides is used to pass the information required in an ip_mreq or
028: * ip6_mreq structure to java natives. We don't have accessor methods as it is
029: * more straight forward in the natives to simply access the fields directly
030: */
031: final class GenericIPMreq {
032:
033: private InetAddress multiaddr;
034:
035: @SuppressWarnings("unused")
036: private InetAddress interfaceAddr;
037:
038: @SuppressWarnings("unused")
039: private boolean isIPV6Address;
040:
041: @SuppressWarnings("unused")
042: private int interfaceIdx;
043:
044: /**
045: * This constructor is used to create an instance of the object
046: *
047: * @param addr multicast address to join/leave
048: *
049: */
050: GenericIPMreq(InetAddress addr) {
051: multiaddr = addr;
052: interfaceAddr = null;
053: interfaceIdx = 0;
054: init();
055: }
056:
057: /**
058: * This constructor is used to create an instance of the object
059: *
060: * @param addr multicast address to join/leave
061: * @param netInterface the NetworkInterface object identifying the interface
062: * on which to join/leave
063: */
064: GenericIPMreq(InetAddress addr, NetworkInterface netInterface) {
065: multiaddr = addr;
066: if (null != netInterface) {
067: // TODO check if necessary
068: //interfaceIdx = netInterface.getIndex();
069:
070: /*
071: * here we need to get the first IPV4 address as we only use it if
072: * we are setting the interface for an IPV4 multicast socket. For
073: * adds/drops on IPV6 addresses we use the index within the
074: * networkInterface
075: */
076: interfaceAddr = null;
077: Enumeration<InetAddress> theAddresses = netInterface
078: .getInetAddresses();
079: if ((addr instanceof Inet4Address)
080: && (theAddresses != null)) {
081: boolean found = false;
082: while ((theAddresses.hasMoreElements())
083: && (found != true)) {
084: InetAddress theAddress = theAddresses.nextElement();
085: if (theAddress instanceof Inet4Address) {
086: interfaceAddr = theAddress;
087: found = true;
088: }
089: }
090: }
091: } else {
092: /*
093: * network interface is null so we just want to defer the decision
094: * to the system
095: */
096: interfaceIdx = 0;
097: interfaceAddr = null;
098: }
099: init();
100: }
101:
102: /**
103: * This method does any required initialization for the constructors
104: */
105: private void init() {
106: /*
107: * set the flag indicating if the multicast address is an IPV6 address
108: * or not
109: */
110: isIPV6Address = ((multiaddr != null) && (multiaddr instanceof Inet6Address));
111: }
112: }
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