com.sun.spot.ipv6
Class Inet6Address

java.lang.Object
  com.sun.spot.ipv6.Inet6Address

All Implemented Interfaces:

Comparable

public class Inet6Address
extends Object
implements Comparable

This class represents an Internet Protocol version 6 (IPv6) address. Defined by RFC 2373: IP Version 6 Addressing Architecture.

Textual representation of IP addresses

Textual representation of IPv6 address used as input to methods takes one of the following forms:

1. The preferred form is x:x:x:x:x:x:x:x, where the 'x's are the hexadecimal values of the eight 16-bit pieces of the address. This is the full form. For example,

   1080:0:0:0:8:800:200C:417A

   Note that it is not necessary to write the leading zeros in an individual field. However, there must be at least one numeral in every field, except as described below.

2. Due to some methods of allocating certain styles of IPv6 addresses, it will be common for addresses to contain long strings of zero bits. In order to make writing addresses containing zero bits easier, a special syntax is available to compress the zeros. The use of "::" indicates multiple groups of 16-bits of zeros. The "::" can only appear once in an address. The "::" can also be used to compress the leading and/or trailing zeros in an address. For example,

   1080::8:800:200C:417A

3. An alternative form that is sometimes more convenient when dealing with a mixed environment of IPv4 and IPv6 nodes is x:x:x:x:x:x:d.d.d.d, where the 'x's are the hexadecimal values of the six high-order 16-bit pieces of the address, and the 'd's are the decimal values of the four low-order 8-bit pieces of the standard IPv4 representation address, for example,

   ::FFFF:129.144.52.38
   ::129.144.52.38

   where "::FFFF:d.d.d.d" and "::d.d.d.d" are, respectively, the general forms of an IPv4-mapped IPv6 address and an IPv4-compatible IPv6 address. Note that the IPv4 portion must be in the "d.d.d.d" form. The following forms are invalid:

   ::FFFF:d.d.d
   ::FFFF:d.d
   ::d.d.d
   ::d.d

   The following form:

   ::FFFF:d

   is valid, however it is an unconventional representation of the IPv4-compatible IPv6 address,

   ::255.255.0.d

   while "::d" corresponds to the general IPv6 address "0:0:0:0:0:0:0:d".

For methods that return a textual representation as output value, the full form is used. Inet6Address will return the full form because it is unambiguous when used in combination with other textual data.

Special IPv6 address

IPv4-mapped address

Of the form::ffff:w.x.y.z, this IPv6 address is used to represent an IPv4 address. It allows the native program to use the same address data structure and also the same socket when communicating with both IPv4 and IPv6 nodes. In InetAddress and Inet6Address, it is used for internal representation; it has no functional role. Java will never return an IPv4-mapped address. These classes can take an IPv4-mapped address as input, both in byte array and text representation. However, it will be converted into an IPv4 address.

Textual representation of IPv6 scoped addresses

The textual representation of IPv6 addresses as described above can be extended to specify IPv6 scoped addresses. This extension to the basic addressing architecture is described in [draft-ietf-ipngwg-scoping-arch-04.txt].

Because link-local and site-local addresses are non-global, it is possible that different hosts may have the same destination address and may be reachable through different interfaces on the same originating system. In this case, the originating system is said to be connected to multiple zones of the same scope. In order to disambiguate which is the intended destination zone, it is possible to append a zone identifier (or scope_id) to an IPv6 address.

The general format for specifying the scope_id is the following:

IPv6-address%scope_id

The IPv6-address is a literal IPv6 address as described above. The scope_id refers to an interface on the local system, and it can be specified in two ways.

1. As a numeric identifier. This must be a positive integer that identifies the particular interface and scope as understood by the system. Usually, the numeric values can be determined through administration tools on the system. Each interface may have multiple values, one for each scope. If the scope is unspecified, then the default value used is zero.
2. As a string. This must be the exact string that is returned by java.net.NetworkInterface#getName() for the particular interface in question. When an Inet6Address is created in this way, the numeric scope-id is determined at the time the object is created by querying the relevant NetworkInterface.

Note also, that the numeric scope_id can be retrieved from Inet6Address instances returned from the NetworkInterface class. This can be used to find out the current scope ids configured on the system.

Since:

1.4

Field Summary

static byte[]	anyBytes
protected static Inet6Address	anyLocalAddress
protected static int	INT16SZ
protected byte[]	ipaddress Holds a 128-bit (16 bytes) IPv6 address.
static byte[]	linkLocalAllNodes
static byte[]	linkLocalPrefix
static byte[]	loopbackAddress
static byte[]	nodeLocalAllNodes

Constructor Summary

Inet6Address()

Inet6Address(byte[] addr)

Inet6Address(byte[] buffer, int start)

Inet6Address(byte[] prefix, long address)

Inet6Address(Inet6Address original)

Inet6Address(long prefix, long address)

Inet6Address(String addr)

Method Summary

static Inet6Address	anyAddress()
static Inet6Address	anyLocalAddress()
int	compare(Object o)
boolean	equals(Object obj) Compares this object against the specified object.
byte[]	getAddress() Returns the raw IP address of this InetAddress object.
int	getNetmaskSize()
int	getScopeId() Returns the numeric scopeId, if this instance is associated with an interface.
int	hashCode() Returns a hashcode for this IP address.
boolean	isAnyLocalAddress() Utility routine to check if the InetAddress in a wildcard address.
boolean	isIPv4CompatibleAddress() Utility routine to check if the InetAddress is an IPv4 compatible IPv6 address.
boolean	isLinkLocalAddress() Utility routine to check if the InetAddress is an link local address.
boolean	isLoopbackAddress() Utility routine to check if the InetAddress is a loopbackAddress address.
boolean	isMCGlobal() Utility routine to check if the multicast address has global scope.
boolean	isMCLinkLocal() Utility routine to check if the multicast address has link scope.
boolean	isMCNodeLocal() Utility routine to check if the multicast address has node scope.
boolean	isMCOrgLocal() Utility routine to check if the multicast address has organization scope.
boolean	isMCSiteLocal() Utility routine to check if the multicast address has site scope.
boolean	isMulticastAddress() Utility routine to check if the InetAddress is an IP multicast address. 11111111 at the start of the address identifies the address as being a multicast address.
boolean	isSiteLocalAddress() Utility routine to check if the InetAddress is a site local address.
static Inet6Address	loopbackAddress()
String	toString() Returns a string representation of the object.

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Field Detail

ipaddress

protected byte[] ipaddress

Holds a 128-bit (16 bytes) IPv6 address.

anyBytes

public static final byte[] anyBytes

linkLocalPrefix

public static final byte[] linkLocalPrefix

anyLocalAddress

protected static Inet6Address anyLocalAddress

loopbackAddress

public static final byte[] loopbackAddress

nodeLocalAllNodes

public static final byte[] nodeLocalAllNodes

linkLocalAllNodes

public static final byte[] linkLocalAllNodes

INT16SZ

protected static final int INT16SZ

See Also:

Constant Field Values

Constructor Detail

Inet6Address

public Inet6Address()

Inet6Address

public Inet6Address(Inet6Address original)

Inet6Address

public Inet6Address(byte[] addr)

Inet6Address

public Inet6Address(String addr)

Inet6Address

public Inet6Address(long prefix,
                    long address)

Inet6Address

public Inet6Address(byte[] buffer,
                    int start)

Inet6Address

public Inet6Address(byte[] prefix,
                    long address)

Method Detail

anyLocalAddress

public static Inet6Address anyLocalAddress()

anyAddress

public static Inet6Address anyAddress()

loopbackAddress

public static Inet6Address loopbackAddress()

isMulticastAddress

public boolean isMulticastAddress()

Utility routine to check if the InetAddress is an IP multicast address. 11111111 at the start of the address identifies the address as being a multicast address.

Returns:

a boolean indicating if the InetAddress is an IP multicast address

isAnyLocalAddress

public boolean isAnyLocalAddress()

Utility routine to check if the InetAddress in a wildcard address.

Returns:

a boolean indicating if the Inetaddress is a wildcard address.

isLoopbackAddress

public boolean isLoopbackAddress()

Utility routine to check if the InetAddress is a loopbackAddress address.

Returns:

a boolean indicating if the InetAddress is a loopbackAddress address; or false otherwise.

isLinkLocalAddress

public boolean isLinkLocalAddress()

Utility routine to check if the InetAddress is an link local address.

Returns:

a boolean indicating if the InetAddress is a link local address; or false if address is not a link local unicast address.

isSiteLocalAddress

public boolean isSiteLocalAddress()

Utility routine to check if the InetAddress is a site local address.

Returns:

a boolean indicating if the InetAddress is a site local address; or false if address is not a site local unicast address.

isMCGlobal

public boolean isMCGlobal()

Utility routine to check if the multicast address has global scope.

Returns:

a boolean indicating if the address has is a multicast address of global scope, false if it is not of global scope or it is not a multicast address

isMCNodeLocal

public boolean isMCNodeLocal()

Utility routine to check if the multicast address has node scope.

Returns:

a boolean indicating if the address has is a multicast address of node-local scope, false if it is not of node-local scope or it is not a multicast address

isMCLinkLocal

public boolean isMCLinkLocal()

Utility routine to check if the multicast address has link scope.

Returns:

a boolean indicating if the address has is a multicast address of link-local scope, false if it is not of link-local scope or it is not a multicast address

isMCSiteLocal

public boolean isMCSiteLocal()

Utility routine to check if the multicast address has site scope.

Returns:

a boolean indicating if the address has is a multicast address of site-local scope, false if it is not of site-local scope or it is not a multicast address

isMCOrgLocal

public boolean isMCOrgLocal()

Utility routine to check if the multicast address has organization scope.

Returns:

a boolean indicating if the address has is a multicast address of organization-local scope, false if it is not of organization-local scope or it is not a multicast address

getAddress

public byte[] getAddress()

Returns the raw IP address of this InetAddress object. The result is in network byte order: the highest order byte of the address is in getAddress()[0].

Returns:

the raw IP address of this object.

getScopeId

public int getScopeId()

Returns the numeric scopeId, if this instance is associated with an interface. If no scoped_id is set, the returned value is zero.

Returns:

the scopeId, or zero if not set.

getNetmaskSize

public int getNetmaskSize()

hashCode

public int hashCode()

Returns a hashcode for this IP address.

Overrides:

hashCode in class Object

Returns:

a hash code value for this IP address.

See Also:

Object.equals(java.lang.Object), Hashtable

equals

public boolean equals(Object obj)

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 IP address as this object.

Two instances of InetAddress represent the same IP address if the length of the byte arrays returned by getAddress is the same for both, and each of the array components is the same for the byte arrays.

Overrides:

equals in class Object

Parameters:

obj - the object to compare against.

Returns:

true if the objects are the same; false otherwise.

See Also:

java.net.InetAddress#getAddress()

isIPv4CompatibleAddress

public boolean isIPv4CompatibleAddress()

Utility routine to check if the InetAddress is an IPv4 compatible IPv6 address.

Returns:

a boolean indicating if the InetAddress is an IPv4 compatible IPv6 address; or false if address is IPv4 address.

toString

public String toString()

Description copied from class: Object

Returns a string representation of the object. In general, the toString method returns a string that "textually represents" this object. The result should be a concise but informative representation that is easy for a person to read. It is recommended that all subclasses override this method.

The toString method for class Object returns a string consisting of the name of the class of which the object is an instance, the at-sign character `@', and the unsigned hexadecimal representation of the hash code of the object. In other words, this method returns a string equal to the value of:

 getClass().getName() + '@' + Integer.toHexString(hashCode())
 

Overrides:

toString in class Object

Returns:

a string representation of the object.

compare

public int compare(Object o)

Specified by:

compare in interface Comparable