* It provides an immutable object used by sockets for binding, connecting, or * as returned values. *
* The wildcard is a special local IP address. It usually means "any"
* and can only be used for bind operations.
*
* @see java.net.Socket
* @see java.net.ServerSocket
* @since 1.4
*/
public class InetSocketAddress
extends SocketAddress
{
// Private implementation class pointed to by all public methods.
private static class InetSocketAddressHolder {
// The hostname of the Socket Address
private String hostname;
// The IP address of the Socket Address
private InetAddress addr;
// The port number of the Socket Address
private int port;
private InetSocketAddressHolder(String hostname, InetAddress addr, int port) {
this.hostname = hostname;
this.addr = addr;
this.port = port;
}
private int getPort() {
return port;
}
private InetAddress getAddress() {
return addr;
}
private String getHostName() {
if (hostname != null)
return hostname;
if (addr != null)
return addr.getHostName();
return null;
}
private String getHostString() {
if (hostname != null)
return hostname;
if (addr != null) {
if (addr.holder().getHostName() != null)
return addr.holder().getHostName();
else
return addr.getHostAddress();
}
return null;
}
private boolean isUnresolved() {
return addr == null;
}
@Override
public String toString() {
if (isUnresolved()) {
return hostname + ":" + port;
} else {
return addr.toString() + ":" + port;
}
}
@Override
public final boolean equals(Object obj) {
if (obj == null || !(obj instanceof InetSocketAddressHolder))
return false;
InetSocketAddressHolder that = (InetSocketAddressHolder)obj;
boolean sameIP;
if (addr != null)
sameIP = addr.equals(that.addr);
else if (hostname != null)
sameIP = (that.addr == null) &&
hostname.equalsIgnoreCase(that.hostname);
else
sameIP = (that.addr == null) && (that.hostname == null);
return sameIP && (port == that.port);
}
@Override
public final int hashCode() {
if (addr != null)
return addr.hashCode() + port;
if (hostname != null)
return hostname.toLowerCase().hashCode() + port;
return port;
}
}
private final transient InetSocketAddressHolder holder;
private static final long serialVersionUID = 5076001401234631237L;
private static int checkPort(int port) {
if (port < 0 || port > 0xFFFF)
throw new IllegalArgumentException("port out of range:" + port);
return port;
}
private static String checkHost(String hostname) {
if (hostname == null)
throw new IllegalArgumentException("hostname can't be null");
return hostname;
}
/**
* @hide internal use only
*/
public InetSocketAddress() {
// These will be filled in the native implementation of recvfrom.
holder = new InetSocketAddressHolder(null, null, 0);
}
/**
* Creates a socket address where the IP address is the wildcard address
* and the port number a specified value.
*
* A valid port value is between 0 and 65535.
* A port number of zero will let the system pick up an
* ephemeral port in a bind operation.
*
* @param port The port number * @throws IllegalArgumentException if the port parameter is outside the specified * range of valid port values. */ public InetSocketAddress(int port) { this((InetAddress)null, port); } /** * * Creates a socket address from an IP address and a port number. *
* A valid port value is between 0 and 65535.
* A port number of zero will let the system pick up an
* ephemeral port in a bind operation.
*
* A null address will assign the wildcard address.
*
* @param addr The IP address * @param port The port number * @throws IllegalArgumentException if the port parameter is outside the specified * range of valid port values. */ public InetSocketAddress(InetAddress addr, int port) { holder = new InetSocketAddressHolder( null, /* ----- BEGIN android ----- Return IPv4 address addr == null ? InetAddress.anyLocalAddress() : addr,*/ addr == null ? Inet6Address.ANY : addr, checkPort(port)); } /** * * Creates a socket address from a hostname and a port number. *
* An attempt will be made to resolve the hostname into an InetAddress. * If that attempt fails, the address will be flagged as unresolved. *
* If there is a security manager, its checkConnect method
* is called with the host name as its argument to check the permissiom
* to resolve it. This could result in a SecurityException.
*
* A valid port value is between 0 and 65535.
* A port number of zero will let the system pick up an
* ephemeral port in a bind operation.
*
* @param hostname the Host name * @param port The port number * @throws IllegalArgumentException if the port parameter is outside the range * of valid port values, or if the hostname parameter is null. * @throws SecurityException if a security manager is present and * permission to resolve the host name is * denied. * @see #isUnresolved() */ public InetSocketAddress(String hostname, int port) { checkHost(hostname); InetAddress addr = null; String host = null; try { addr = InetAddress.getByName(hostname); } catch(UnknownHostException e) { host = hostname; } holder = new InetSocketAddressHolder(host, addr, checkPort(port)); } // private constructor for creating unresolved instances private InetSocketAddress(int port, String hostname) { holder = new InetSocketAddressHolder(hostname, null, port); } /** * * Creates an unresolved socket address from a hostname and a port number. *
* No attempt will be made to resolve the hostname into an InetAddress. * The address will be flagged as unresolved. *
* A valid port value is between 0 and 65535.
* A port number of zero will let the system pick up an
* ephemeral port in a bind operation.
*
* @param host the Host name
* @param port The port number
* @throws IllegalArgumentException if the port parameter is outside
* the range of valid port values, or if the hostname
* parameter is null.
* @see #isUnresolved()
* @return a InetSocketAddress representing the unresolved
* socket address
* @since 1.5
*/
public static InetSocketAddress createUnresolved(String host, int port) {
return new InetSocketAddress(checkPort(port), checkHost(host));
}
/**
* @serialField hostname String
* @serialField addr InetAddress
* @serialField port int
*/
private static final ObjectStreamField[] serialPersistentFields = {
new ObjectStreamField("hostname", String.class),
new ObjectStreamField("addr", InetAddress.class),
new ObjectStreamField("port", int.class)};
private void writeObject(ObjectOutputStream out)
throws IOException
{
// Don't call defaultWriteObject()
ObjectOutputStream.PutField pfields = out.putFields();
pfields.put("hostname", holder.hostname);
pfields.put("addr", holder.addr);
pfields.put("port", holder.port);
out.writeFields();
}
private void readObject(ObjectInputStream in)
throws IOException, ClassNotFoundException
{
// Don't call defaultReadObject()
ObjectInputStream.GetField oisFields = in.readFields();
final String oisHostname = (String)oisFields.get("hostname", null);
final InetAddress oisAddr = (InetAddress)oisFields.get("addr", null);
final int oisPort = oisFields.get("port", -1);
// Check that our invariants are satisfied
checkPort(oisPort);
if (oisHostname == null && oisAddr == null)
throw new InvalidObjectException("hostname and addr " +
"can't both be null");
InetSocketAddressHolder h = new InetSocketAddressHolder(oisHostname,
oisAddr,
oisPort);
UNSAFE.putObject(this, FIELDS_OFFSET, h);
}
private void readObjectNoData()
throws ObjectStreamException
{
throw new InvalidObjectException("Stream data required");
}
private static final long FIELDS_OFFSET;
private static final sun.misc.Unsafe UNSAFE;
static {
try {
sun.misc.Unsafe unsafe = sun.misc.Unsafe.getUnsafe();
FIELDS_OFFSET = unsafe.objectFieldOffset(
InetSocketAddress.class.getDeclaredField("holder"));
UNSAFE = unsafe;
} catch (ReflectiveOperationException e) {
throw new Error(e);
}
}
/**
* Gets the port number.
*
* @return the port number.
*/
public final int getPort() {
return holder.getPort();
}
/**
*
* Gets the InetAddress.
*
* @return the InetAdress or null if it is unresolved.
*/
public final InetAddress getAddress() {
return holder.getAddress();
}
/**
* Gets the hostname.
* Note: This method may trigger a name service reverse lookup if the
* address was created with a literal IP address.
*
* @return the hostname part of the address.
*/
public final String getHostName() {
return holder.getHostName();
}
/**
* Returns the hostname, or the String form of the address if it
* doesn't have a hostname (it was created using a literal).
* This has the benefit of not attempting a reverse lookup.
*
* @return the hostname, or String representation of the address.
* @since 1.7
*/
public final String getHostString() {
return holder.getHostString();
}
/**
* Checks whether the address has been resolved or not.
*
* @return true if the hostname couldn't be resolved into
* an InetAddress.
*/
public final boolean isUnresolved() {
return holder.isUnresolved();
}
/**
* Constructs a string representation of this InetSocketAddress.
* This String is constructed by calling toString() on the InetAddress
* and concatenating the port number (with a colon). If the address
* is unresolved then the part before the colon will only contain the hostname.
*
* @return a string representation of this object.
*/
@Override
public String toString() {
return holder.toString();
}
/**
* Compares this object against the specified object.
* The result is true if and only if the argument is
* not null and it represents the same address as
* this object.
*
* Two instances of InetSocketAddress represent the same
* address if both the InetAddresses (or hostnames if it is unresolved) and port
* numbers are equal.
* If both addresses are unresolved, then the hostname & the port number
* are compared.
*
* Note: Hostnames are case insensitive. e.g. "FooBar" and "foobar" are
* considered equal.
*
* @param obj the object to compare against.
* @return true if the objects are the same;
* false otherwise.
* @see java.net.InetAddress#equals(java.lang.Object)
*/
@Override
public final boolean equals(Object obj) {
if (obj == null || !(obj instanceof InetSocketAddress))
return false;
return holder.equals(((InetSocketAddress) obj).holder);
}
/**
* Returns a hashcode for this socket address.
*
* @return a hash code value for this socket address.
*/
@Override
public final int hashCode() {
return holder.hashCode();
}
}