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/*
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* Copyright 2007-2008 Sun Microsystems, Inc. All Rights Reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Sun designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Sun in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*/
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package sun.nio.ch;
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import java.nio.channels.*;
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import java.net.InetAddress;
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import java.net.NetworkInterface;
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import java.io.IOException;
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import java.util.HashSet;
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/**
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* MembershipKey implementation.
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*/
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class MembershipKeyImpl
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extends MembershipKey
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{
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private final MulticastChannel ch;
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private final InetAddress group;
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private final NetworkInterface interf;
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private final InetAddress source;
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// true when key is valid
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private volatile boolean valid = true;
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// lock used when creating or accessing blockedSet
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private Object stateLock = new Object();
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// set of source addresses that are blocked
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private HashSet<InetAddress> blockedSet;
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private MembershipKeyImpl(MulticastChannel ch,
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InetAddress group,
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NetworkInterface interf,
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InetAddress source)
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{
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this.ch = ch;
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this.group = group;
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this.interf = interf;
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this.source = source;
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}
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/**
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* MembershipKey will additional context for IPv4 membership
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*/
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static class Type4 extends MembershipKeyImpl {
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private final int groupAddress;
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private final int interfAddress;
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private final int sourceAddress;
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Type4(MulticastChannel ch,
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InetAddress group,
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NetworkInterface interf,
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InetAddress source,
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int groupAddress,
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int interfAddress,
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int sourceAddress)
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{
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super(ch, group, interf, source);
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this.groupAddress = groupAddress;
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this.interfAddress = interfAddress;
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this.sourceAddress = sourceAddress;
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}
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int group() {
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return groupAddress;
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}
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int interfaceAddress() {
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return interfAddress;
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}
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int source() {
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return sourceAddress;
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}
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}
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/**
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* MembershipKey will additional context for IPv6 membership
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*/
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static class Type6 extends MembershipKeyImpl {
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private final byte[] groupAddress;
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private final int index;
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private final byte[] sourceAddress;
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Type6(MulticastChannel ch,
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InetAddress group,
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NetworkInterface interf,
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InetAddress source,
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byte[] groupAddress,
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int index,
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byte[] sourceAddress)
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{
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super(ch, group, interf, source);
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this.groupAddress = groupAddress;
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this.index = index;
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this.sourceAddress = sourceAddress;
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}
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byte[] group() {
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return groupAddress;
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}
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int index() {
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return index;
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}
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byte[] source() {
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return sourceAddress;
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}
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}
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public boolean isValid() {
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return valid;
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}
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// package-private
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void invalidate() {
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valid = false;
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}
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public void drop() throws IOException {
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// delegate to channel
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((DatagramChannelImpl)ch).drop(this);
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}
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@Override
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public MulticastChannel getChannel() {
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return ch;
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}
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@Override
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public InetAddress getGroup() {
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return group;
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}
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@Override
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public NetworkInterface getNetworkInterface() {
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return interf;
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}
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@Override
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public InetAddress getSourceAddress() {
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return source;
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}
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@Override
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public MembershipKey block(InetAddress toBlock)
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throws IOException
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{
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if (source != null)
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throw new IllegalStateException("key is source-specific");
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synchronized (stateLock) {
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if ((blockedSet != null) && blockedSet.contains(toBlock)) {
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// already blocked, nothing to do
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return this;
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}
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((DatagramChannelImpl)ch).block(this, toBlock);
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// created blocked set if required and add source address
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if (blockedSet == null)
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blockedSet = new HashSet<InetAddress>();
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blockedSet.add(toBlock);
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}
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return this;
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}
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@Override
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public MembershipKey unblock(InetAddress toUnblock)
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throws IOException
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{
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synchronized (stateLock) {
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if ((blockedSet == null) || !blockedSet.contains(toUnblock))
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throw new IllegalStateException("not blocked");
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((DatagramChannelImpl)ch).unblock(this, toUnblock);
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blockedSet.remove(toUnblock);
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}
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return this;
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}
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@Override
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public String toString() {
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StringBuilder sb = new StringBuilder(64);
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sb.append('<');
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sb.append(group.getHostAddress());
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sb.append(',');
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sb.append(interf.getName());
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if (source != null) {
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sb.append(',');
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sb.append(source.getHostAddress());
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}
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sb.append('>');
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return sb.toString();
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}
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}
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