author | weijun |
Tue, 26 Jun 2018 18:55:48 +0800 | |
changeset 50788 | 6274aee1f692 |
parent 48435 | 20fe8cd3179d |
child 52220 | 9c260a6b6471 |
permissions | -rw-r--r-- |
2 | 1 |
/* |
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* Copyright (c) 2000, 2018, Oracle and/or its affiliates. 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. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package java.net; |
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||
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import java.io.IOException; |
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import java.io.InvalidObjectException; |
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16089 | 29 |
import java.io.ObjectInputStream; |
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import java.io.ObjectOutputStream; |
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import java.io.ObjectStreamException; |
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import java.io.ObjectStreamField; |
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/** |
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* |
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* This class implements an IP Socket Address (IP address + port number) |
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* It can also be a pair (hostname + port number), in which case an attempt |
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* will be made to resolve the hostname. If resolution fails then the address |
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* is said to be <I>unresolved</I> but can still be used on some circumstances |
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* like connecting through a proxy. |
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* <p> |
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* It provides an immutable object used by sockets for binding, connecting, or |
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* as returned values. |
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* <p> |
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* The <i>wildcard</i> is a special local IP address. It usually means "any" |
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* and can only be used for {@code bind} operations. |
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* |
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* @see java.net.Socket |
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* @see java.net.ServerSocket |
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* @since 1.4 |
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*/ |
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public class InetSocketAddress |
53 |
extends SocketAddress |
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{ |
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// Private implementation class pointed to by all public methods. |
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private static class InetSocketAddressHolder { |
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// The hostname of the Socket Address |
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private String hostname; |
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// The IP address of the Socket Address |
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private InetAddress addr; |
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// The port number of the Socket Address |
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private int port; |
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private InetSocketAddressHolder(String hostname, InetAddress addr, int port) { |
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this.hostname = hostname; |
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this.addr = addr; |
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this.port = port; |
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} |
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private int getPort() { |
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return port; |
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} |
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private InetAddress getAddress() { |
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return addr; |
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} |
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private String getHostName() { |
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if (hostname != null) |
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return hostname; |
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if (addr != null) |
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return addr.getHostName(); |
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return null; |
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} |
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private String getHostString() { |
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if (hostname != null) |
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return hostname; |
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if (addr != null) { |
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if (addr.holder().getHostName() != null) |
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return addr.holder().getHostName(); |
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else |
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return addr.getHostAddress(); |
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} |
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return null; |
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} |
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private boolean isUnresolved() { |
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return addr == null; |
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} |
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@Override |
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public String toString() { |
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if (isUnresolved()) { |
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return hostname + ":" + port; |
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} else { |
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return addr.toString() + ":" + port; |
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} |
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} |
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||
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@Override |
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public final boolean equals(Object obj) { |
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if (obj == null || !(obj instanceof InetSocketAddressHolder)) |
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return false; |
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InetSocketAddressHolder that = (InetSocketAddressHolder)obj; |
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boolean sameIP; |
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if (addr != null) |
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sameIP = addr.equals(that.addr); |
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else if (hostname != null) |
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sameIP = (that.addr == null) && |
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hostname.equalsIgnoreCase(that.hostname); |
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else |
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sameIP = (that.addr == null) && (that.hostname == null); |
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return sameIP && (port == that.port); |
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} |
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@Override |
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public final int hashCode() { |
|
129 |
if (addr != null) |
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return addr.hashCode() + port; |
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if (hostname != null) |
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return hostname.toLowerCase().hashCode() + port; |
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return port; |
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} |
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} |
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private final transient InetSocketAddressHolder holder; |
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private static final long serialVersionUID = 5076001401234631237L; |
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private static int checkPort(int port) { |
142 |
if (port < 0 || port > 0xFFFF) |
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throw new IllegalArgumentException("port out of range:" + port); |
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return port; |
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} |
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private static String checkHost(String hostname) { |
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if (hostname == null) |
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throw new IllegalArgumentException("hostname can't be null"); |
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return hostname; |
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} |
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/** |
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* Creates a socket address where the IP address is the wildcard address |
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* and the port number a specified value. |
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* <p> |
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* A valid port value is between 0 and 65535. |
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* A port number of {@code zero} will let the system pick up an |
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* ephemeral port in a {@code bind} operation. |
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* |
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* @param port The port number |
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* @throws IllegalArgumentException if the port parameter is outside the specified |
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* range of valid port values. |
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*/ |
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public InetSocketAddress(int port) { |
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this(InetAddress.anyLocalAddress(), port); |
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} |
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/** |
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* |
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* Creates a socket address from an IP address and a port number. |
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* <p> |
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* A valid port value is between 0 and 65535. |
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* A port number of {@code zero} will let the system pick up an |
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* ephemeral port in a {@code bind} operation. |
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* <P> |
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* A {@code null} address will assign the <i>wildcard</i> address. |
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* |
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* @param addr The IP address |
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* @param port The port number |
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* @throws IllegalArgumentException if the port parameter is outside the specified |
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* range of valid port values. |
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*/ |
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public InetSocketAddress(InetAddress addr, int port) { |
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holder = new InetSocketAddressHolder( |
186 |
null, |
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addr == null ? InetAddress.anyLocalAddress() : addr, |
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checkPort(port)); |
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} |
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/** |
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* |
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* Creates a socket address from a hostname and a port number. |
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* <p> |
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* An attempt will be made to resolve the hostname into an InetAddress. |
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* If that attempt fails, the address will be flagged as <I>unresolved</I>. |
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* <p> |
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* If there is a security manager, its {@code checkConnect} method |
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* is called with the host name as its argument to check the permission |
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* to resolve it. This could result in a SecurityException. |
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* <P> |
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* A valid port value is between 0 and 65535. |
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* A port number of {@code zero} will let the system pick up an |
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* ephemeral port in a {@code bind} operation. |
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* |
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* @param hostname the Host name |
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* @param port The port number |
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* @throws IllegalArgumentException if the port parameter is outside the range |
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* of valid port values, or if the hostname parameter is {@code null}. |
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* @throws SecurityException if a security manager is present and |
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* permission to resolve the host name is |
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* denied. |
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* @see #isUnresolved() |
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*/ |
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public InetSocketAddress(String hostname, int port) { |
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checkHost(hostname); |
217 |
InetAddress addr = null; |
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String host = null; |
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try { |
220 |
addr = InetAddress.getByName(hostname); |
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} catch(UnknownHostException e) { |
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host = hostname; |
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} |
16089 | 224 |
holder = new InetSocketAddressHolder(host, addr, checkPort(port)); |
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} |
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// private constructor for creating unresolved instances |
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private InetSocketAddress(int port, String hostname) { |
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holder = new InetSocketAddressHolder(hostname, null, port); |
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} |
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232 |
/** |
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* |
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* Creates an unresolved socket address from a hostname and a port number. |
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* <p> |
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* No attempt will be made to resolve the hostname into an InetAddress. |
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* The address will be flagged as <I>unresolved</I>. |
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* <p> |
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239 |
* A valid port value is between 0 and 65535. |
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* A port number of {@code zero} will let the system pick up an |
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* ephemeral port in a {@code bind} operation. |
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* |
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* @param host the Host name |
244 |
* @param port The port number |
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* @throws IllegalArgumentException if the port parameter is outside |
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* the range of valid port values, or if the hostname |
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* parameter is {@code null}. |
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* @see #isUnresolved() |
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* @return an {@code InetSocketAddress} representing the unresolved |
2 | 250 |
* socket address |
251 |
* @since 1.5 |
|
252 |
*/ |
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253 |
public static InetSocketAddress createUnresolved(String host, int port) { |
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16089 | 254 |
return new InetSocketAddress(checkPort(port), checkHost(host)); |
2 | 255 |
} |
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/** |
258 |
* @serialField hostname String |
|
259 |
* @serialField addr InetAddress |
|
260 |
* @serialField port int |
|
261 |
*/ |
|
262 |
private static final ObjectStreamField[] serialPersistentFields = { |
|
263 |
new ObjectStreamField("hostname", String.class), |
|
264 |
new ObjectStreamField("addr", InetAddress.class), |
|
265 |
new ObjectStreamField("port", int.class)}; |
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266 |
||
267 |
private void writeObject(ObjectOutputStream out) |
|
268 |
throws IOException |
|
269 |
{ |
|
270 |
// Don't call defaultWriteObject() |
|
271 |
ObjectOutputStream.PutField pfields = out.putFields(); |
|
272 |
pfields.put("hostname", holder.hostname); |
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273 |
pfields.put("addr", holder.addr); |
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274 |
pfields.put("port", holder.port); |
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275 |
out.writeFields(); |
|
276 |
} |
|
277 |
||
278 |
private void readObject(ObjectInputStream in) |
|
279 |
throws IOException, ClassNotFoundException |
|
280 |
{ |
|
281 |
// Don't call defaultReadObject() |
|
282 |
ObjectInputStream.GetField oisFields = in.readFields(); |
|
283 |
final String oisHostname = (String)oisFields.get("hostname", null); |
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284 |
final InetAddress oisAddr = (InetAddress)oisFields.get("addr", null); |
|
285 |
final int oisPort = oisFields.get("port", -1); |
|
2 | 286 |
|
287 |
// Check that our invariants are satisfied |
|
16089 | 288 |
checkPort(oisPort); |
289 |
if (oisHostname == null && oisAddr == null) |
|
2 | 290 |
throw new InvalidObjectException("hostname and addr " + |
291 |
"can't both be null"); |
|
16089 | 292 |
|
293 |
InetSocketAddressHolder h = new InetSocketAddressHolder(oisHostname, |
|
294 |
oisAddr, |
|
295 |
oisPort); |
|
296 |
UNSAFE.putObject(this, FIELDS_OFFSET, h); |
|
297 |
} |
|
298 |
||
299 |
private void readObjectNoData() |
|
300 |
throws ObjectStreamException |
|
301 |
{ |
|
302 |
throw new InvalidObjectException("Stream data required"); |
|
303 |
} |
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private static final jdk.internal.misc.Unsafe UNSAFE |
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= jdk.internal.misc.Unsafe.getUnsafe(); |
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private static final long FIELDS_OFFSET |
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308 |
= UNSAFE.objectFieldOffset(InetSocketAddress.class, "holder"); |
2 | 309 |
|
310 |
/** |
|
311 |
* Gets the port number. |
|
312 |
* |
|
313 |
* @return the port number. |
|
314 |
*/ |
|
315 |
public final int getPort() { |
|
16089 | 316 |
return holder.getPort(); |
2 | 317 |
} |
318 |
||
319 |
/** |
|
19069 | 320 |
* Gets the {@code InetAddress}. |
2 | 321 |
* |
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* @return the InetAddress or {@code null} if it is unresolved. |
2 | 323 |
*/ |
324 |
public final InetAddress getAddress() { |
|
16089 | 325 |
return holder.getAddress(); |
2 | 326 |
} |
327 |
||
328 |
/** |
|
19069 | 329 |
* Gets the {@code hostname}. |
2 | 330 |
* Note: This method may trigger a name service reverse lookup if the |
331 |
* address was created with a literal IP address. |
|
332 |
* |
|
333 |
* @return the hostname part of the address. |
|
334 |
*/ |
|
335 |
public final String getHostName() { |
|
16089 | 336 |
return holder.getHostName(); |
2 | 337 |
} |
338 |
||
339 |
/** |
|
340 |
* Returns the hostname, or the String form of the address if it |
|
341 |
* doesn't have a hostname (it was created using a literal). |
|
16089 | 342 |
* This has the benefit of <b>not</b> attempting a reverse lookup. |
2 | 343 |
* |
344 |
* @return the hostname, or String representation of the address. |
|
345 |
* @since 1.7 |
|
346 |
*/ |
|
347 |
public final String getHostString() { |
|
16089 | 348 |
return holder.getHostString(); |
2 | 349 |
} |
350 |
||
351 |
/** |
|
352 |
* Checks whether the address has been resolved or not. |
|
353 |
* |
|
19069 | 354 |
* @return {@code true} if the hostname couldn't be resolved into |
355 |
* an {@code InetAddress}. |
|
2 | 356 |
*/ |
357 |
public final boolean isUnresolved() { |
|
16089 | 358 |
return holder.isUnresolved(); |
2 | 359 |
} |
360 |
||
361 |
/** |
|
362 |
* Constructs a string representation of this InetSocketAddress. |
|
363 |
* This String is constructed by calling toString() on the InetAddress |
|
364 |
* and concatenating the port number (with a colon). If the address |
|
365 |
* is unresolved then the part before the colon will only contain the hostname. |
|
366 |
* |
|
367 |
* @return a string representation of this object. |
|
368 |
*/ |
|
16089 | 369 |
@Override |
2 | 370 |
public String toString() { |
16089 | 371 |
return holder.toString(); |
2 | 372 |
} |
373 |
||
374 |
/** |
|
375 |
* Compares this object against the specified object. |
|
19069 | 376 |
* The result is {@code true} if and only if the argument is |
377 |
* not {@code null} and it represents the same address as |
|
2 | 378 |
* this object. |
379 |
* <p> |
|
19069 | 380 |
* Two instances of {@code InetSocketAddress} represent the same |
2 | 381 |
* address if both the InetAddresses (or hostnames if it is unresolved) and port |
382 |
* numbers are equal. |
|
18156 | 383 |
* If both addresses are unresolved, then the hostname and the port number |
2 | 384 |
* are compared. |
385 |
* |
|
386 |
* Note: Hostnames are case insensitive. e.g. "FooBar" and "foobar" are |
|
387 |
* considered equal. |
|
388 |
* |
|
389 |
* @param obj the object to compare against. |
|
19069 | 390 |
* @return {@code true} if the objects are the same; |
391 |
* {@code false} otherwise. |
|
2 | 392 |
* @see java.net.InetAddress#equals(java.lang.Object) |
393 |
*/ |
|
16089 | 394 |
@Override |
2 | 395 |
public final boolean equals(Object obj) { |
396 |
if (obj == null || !(obj instanceof InetSocketAddress)) |
|
397 |
return false; |
|
16089 | 398 |
return holder.equals(((InetSocketAddress) obj).holder); |
2 | 399 |
} |
400 |
||
401 |
/** |
|
402 |
* Returns a hashcode for this socket address. |
|
403 |
* |
|
404 |
* @return a hash code value for this socket address. |
|
405 |
*/ |
|
16089 | 406 |
@Override |
2 | 407 |
public final int hashCode() { |
16089 | 408 |
return holder.hashCode(); |
2 | 409 |
} |
410 |
} |