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/*
* 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 java.net;
import java.io.IOException;
import java.io.ObjectInputStream;
/**
* This class represents a socket endpoint described by a IP address and a port
* number. It is a concrete implementation of {@code SocketAddress} for IP.
*/
public class InetSocketAddress extends SocketAddress {
private static final long serialVersionUID = 5076001401234631237L;
private String hostname;
private InetAddress addr;
private int port;
/**
* Creates a socket endpoint with the given port number {@code port} and
* no specified address. The range for valid port numbers is between 0 and
* 65535 inclusive.
*
* @param port
* the specified port number to which this socket is bound.
*/
public InetSocketAddress(int port) {
this((InetAddress) null, port);
}
/**
* Creates a socket endpoint with the given port number {@code port} and
* {@code address}. The range for valid port numbers is between 0 and 65535
* inclusive. If {@code address} is {@code null} this socket is bound to the
* IPv4 wildcard address.
*
* @param port
* the specified port number to which this socket is bound.
* @param address
* the specified address to which this socket is bound.
*/
public InetSocketAddress(InetAddress address, int port) {
if (port < 0 || port > 65535) {
throw new IllegalArgumentException();
}
if (address == null) {
addr = Inet4Address.ANY;
} else {
addr = address;
}
hostname = addr.getHostName();
this.port = port;
}
/**
* Creates a socket endpoint with the given port number {@code port} and the
* hostname {@code host}. The hostname is tried to be resolved and cannot be
* {@code null}. The range for valid port numbers is between 0 and 65535
* inclusive.
*
* @param port
* the specified port number to which this socket is bound.
* @param host
* the specified hostname to which this socket is bound.
* @throws SecurityException
* if a {@link SecurityManager} is installed and its {@code
* checkConnect()} method does not allow the resolving of the
* host name.
*/
public InetSocketAddress(String host, int port) {
this(host, port, true);
}
/*
* Internal constructor for InetSocketAddress(String, int) and
* createUnresolved(String, int);
*/
InetSocketAddress(String host, int port, boolean needResolved) {
if (host == null || port < 0 || port > 65535) {
throw new IllegalArgumentException();
}
hostname = host;
this.port = port;
if (needResolved) {
// BEGIN android-added
SecurityManager smgr = System.getSecurityManager();
if(smgr != null) {
smgr.checkConnect(host, port);
}
// END android-added
try {
addr = InetAddress.getByName(hostname);
hostname = null;
} catch (UnknownHostException e) {
// Ignored
}
} else {
addr = null;
}
}
/**
* Creates an {@code InetSocketAddress} without trying to resolve the
* hostname into an {@code InetAddress}. The address field is marked as
* unresolved.
*
* @param host
* the specified hostname to which this socket is bound.
* @param port
* the specified port number to which this socket is bound.
* @return the created InetSocketAddress instance.
* @throws IllegalArgumentException
* if the hostname {@code host} is {@code null} or the port is
* not in the range between 0 and 65535.
*/
public static InetSocketAddress createUnresolved(String host, int port) {
return new InetSocketAddress(host, port, false);
}
/**
* Gets the port number of this socket.
*
* @return the socket endpoint port number.
*/
public final int getPort() {
return port;
}
/**
* Gets the address of this socket.
*
* @return the socket endpoint address.
*/
public final InetAddress getAddress() {
return addr;
}
/**
* Gets the hostname of this socket.
*
* @return the socket endpoint hostname.
*/
public final String getHostName() {
return (null != addr) ? addr.getHostName() : hostname;
}
/**
* Returns whether this socket address is unresolved or not.
*
* @return {@code true} if this socket address is unresolved, {@code false}
* otherwise.
*/
public final boolean isUnresolved() {
return addr == null;
}
/**
* Gets a string representation of this socket included the address and the
* port number.
*
* @return the address and port number as a textual representation.
*/
@Override
public String toString() {
String host;
if (addr != null) {
host = addr.toString();
} else {
host = hostname;
}
return host + ":" + port;
}
/**
* Compares two socket endpoints and returns true if they are equal. Two
* socket endpoints are equal if the IP address or the hostname of both are
* equal and they are bound to the same port.
*
* @param socketAddr
* the object to be tested for equality.
* @return {@code true} if this socket and the given socket object {@code
* socketAddr} are equal, {@code false} otherwise.
*/
@Override
public final boolean equals(Object socketAddr) {
if (this == socketAddr) {
return true;
}
if (!(socketAddr instanceof InetSocketAddress)) {
return false;
}
InetSocketAddress iSockAddr = (InetSocketAddress) socketAddr;
// check the ports as we always need to do this
if (port != iSockAddr.port) {
return false;
}
// we only use the hostnames in the comparison if the addrs were not
// resolved
if ((addr == null) && (iSockAddr.addr == null)) {
return hostname.equals(iSockAddr.hostname);
}
// addrs were resolved so use them for the comparison
if (addr == null) {
// if we are here we know iSockAddr is not null so just return
// false
return false;
}
return addr.equals(iSockAddr.addr);
}
/**
* Gets the hashcode of this socket.
*
* @return the appropriate hashcode.
*/
@Override
public final int hashCode() {
if (addr == null) {
return hostname.hashCode() + port;
}
return addr.hashCode() + port;
}
private void readObject(ObjectInputStream stream) throws IOException,
ClassNotFoundException {
stream.defaultReadObject();
}
}
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