org.xmpp.packet

Class JID

java.lang.Object

org.xmpp.packet.JID

All Implemented Interfaces:

Serializable, Comparable<JID>

@Immutable
public class JID
extends Object
implements Comparable<JID>, Serializable

An XMPP address (JID). A JID is made up of a node (generally a username), a domain, and a resource. The node and resource are optional; domain is required. In simple ABNF form:

jid = [ node "@" ] domain [ "/" resource ]

Some sample JID's:

• user@example.com
• user@example.com/home
• example.com

Each allowable portion of a JID (node, domain, and resource) must not be more than 1023 bytes in length, resulting in a maximum total size (including the '@' and '/' separators) of 3071 bytes. JID instances are immutable. Multiple threads can act on data represented by JID objects without concern of the data being changed by other threads.

Author:

Matt Tucker, Guus der Kinderen, guus.der.kinderen@gmail.com

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
JID(String jid) Constructs a JID from it's String representation.
JID(String jid, boolean skipStringPrep) Constructs a JID from it's String representation.
JID(String node, String domain, String resource) Constructs a JID given a node, domain, and resource.
JID(String node, String domain, String resource, boolean skipStringprep) Constructs a JID given a node, domain, and resource being able to specify if stringprep should be applied or not.

Method Summary

Modifier and Type	Method and Description
JID	asBareJID() Returns the bare JID representation of this JID, which is the JID with resource information removed.
int	compareTo(JID jid)
static String	domainprep(String domain) Returns a valid representation of a JID domain part, based on the provided input.
boolean	equals(Object object)
static boolean	equals(String jid1, String jid2) Returns true if two JID's are equivalent.
static String	escapeNode(String node) Escapes the node portion of a JID according to "JID Escaping" (XEP-0106).
String	getDomain() Returns the domain.
String	getNode() Returns the node, or null if this JID does not contain node information.
String	getResource() Returns the resource, or null if this JID does not contain resource information.
int	hashCode()
static String	nodeprep(String node) Returns a valid representation of a JID node, based on the provided input.
static String	resourceprep(String resource) Returns a valid representation of a JID resource, based on the provided input.
String	toBareJID() Returns the String representation of the bare JID, which is the JID with resource information removed.
String	toFullJID() Returns the String representation of the full JID, for example: username@domain.com/mobile.
String	toString() Returns a String representation of the JID.
static String	unescapeNode(String node) Un-escapes the node portion of a JID according to "JID Escaping" (XEP-0106).

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

JID

public JID(String jid)

Constructs a JID from it's String representation.

Parameters:

jid - a valid JID.

Throws:

IllegalArgumentException - if the JID is not valid.

JID

public JID(String jid,
           boolean skipStringPrep)

Constructs a JID from it's String representation. This construction allows the caller to specify if stringprep should be applied or not.

Parameters:

jid - a valid JID.

skipStringPrep - true if stringprep should not be applied.

Throws:

IllegalArgumentException - if the JID is not valid.

JID

public JID(String node,
           String domain,
           String resource)

Constructs a JID given a node, domain, and resource.

Parameters:

node - the node.

domain - the domain, which must not be null.

resource - the resource.

Throws:

NullPointerException - if domain is null.

IllegalArgumentException - if the JID is not valid.

JID

public JID(String node,
           String domain,
           String resource,
           boolean skipStringprep)

Constructs a JID given a node, domain, and resource being able to specify if stringprep should be applied or not.

Parameters:

node - the node.

domain - the domain, which must not be null.

resource - the resource.

skipStringprep - true if stringprep should not be applied.

Throws:

NullPointerException - if domain is null.

IllegalArgumentException - if the JID is not valid.

Method Detail

escapeNode

public static String escapeNode(String node)

Escapes the node portion of a JID according to "JID Escaping" (XEP-0106). Escaping replaces characters prohibited by node-prep with escape sequences, as follows:

Unescaped Character	Encoded Sequence
<space>	\20
"	\22
&	\26
'	\27
/	\2f
:	\3a
<	\3c
>	\3e
@	\40
\	\5c

This process is useful when the node comes from an external source that doesn't conform to nodeprep. For example, a username in LDAP may be "Joe Smith". Because the <space> character isn't a valid part of a node, the username should be escaped to "Joe\20Smith" before being made into a JID (e.g. "joe\20smith@example.com" after case-folding, etc. has been applied).

All node escaping and un-escaping must be performed manually at the appropriate time; the JID class will not escape or un-escape automatically.

Parameters:

node - the node.

Returns:

the escaped version of the node.

See Also:

XEP-0106: JID Escaping

unescapeNode

public static String unescapeNode(String node)

Un-escapes the node portion of a JID according to "JID Escaping" (XEP-0106).

Escaping replaces characters prohibited by node-prep with escape sequences, as follows:

Unescaped Character	Encoded Sequence
<space>	\20
"	\22
&	\26
'	\27
/	\2f
:	\3a
<	\3c
>	\3e
@	\40
\	\5c

This process is useful when the node comes from an external source that doesn't conform to nodeprep. For example, a username in LDAP may be "Joe Smith". Because the <space> character isn't a valid part of a node, the username should be escaped to "Joe\20Smith" before being made into a JID (e.g. "joe\20smith@example.com" after case-folding, etc. has been applied).

All node escaping and un-escaping must be performed manually at the appropriate time; the JID class will not escape or un-escape automatically.

Parameters:

node - the escaped version of the node.

Returns:

the un-escaped version of the node.

See Also:

XEP-0106: JID Escaping

nodeprep

public static String nodeprep(String node)

Returns a valid representation of a JID node, based on the provided input. This method throws an IllegalArgumentException if the provided argument cannot be represented as a valid JID node (e.g. if StringPrepping fails).

Parameters:

node - The raw node value.

Returns:

A String based JID node representation

Throws:

IllegalStateException - If the UTF-8 charset is not supported by the system. This exception wraps an UnsupportedEncodingException.

IllegalArgumentException - if node is not a valid JID node.

domainprep

public static String domainprep(String domain)
                         throws gnu.inet.encoding.StringprepException

Returns a valid representation of a JID domain part, based on the provided input. This method throws an IllegalArgumentException if the provided argument cannot be represented as a valid JID domain part (e.g. if Stringprepping fails).

Parameters:

domain - The raw domain value.

Returns:

A String based JID domain part representation

Throws:

IllegalStateException - If the UTF-8 charset is not supported by the system. This exception wraps an UnsupportedEncodingException.

IllegalArgumentException - if domain is not a valid JID domain part.

gnu.inet.encoding.StringprepException

resourceprep

public static String resourceprep(String resource)
                           throws gnu.inet.encoding.StringprepException

Returns a valid representation of a JID resource, based on the provided input. This method throws an IllegalArgumentException if the provided argument cannot be represented as a valid JID resource (e.g. if StringPrepping fails).

Parameters:

resource - The raw resource value.

Returns:

A String based JID resource representation

Throws:

IllegalStateException - If the UTF-8 charset is not supported by the system. This exception wraps an UnsupportedEncodingException.

IllegalArgumentException - if resource is not a valid JID resource.

gnu.inet.encoding.StringprepException

getNode

public String getNode()

Returns the node, or null if this JID does not contain node information.

Returns:

the node.

getDomain

public String getDomain()

Returns the domain.

Returns:

the domain.

getResource

public String getResource()

Returns the resource, or null if this JID does not contain resource information.

Returns:

the resource.

toBareJID

public String toBareJID()

Returns the String representation of the bare JID, which is the JID with resource information removed. For example: username@domain.com

Returns:

the bare JID.

asBareJID

public JID asBareJID()

Returns the bare JID representation of this JID, which is the JID with resource information removed. For example: username@domain.com

Returns:

the bare JID.

See Also:

TINDER-68

toFullJID

public String toFullJID()

Returns the String representation of the full JID, for example: username@domain.com/mobile. If no resource has been provided in the constructor of this object, an IllegalStateException is thrown.

Returns:

the full JID.

Throws:

IllegalStateException - If no resource was provided in the constructor used to create this instance.

toString

public String toString()

Returns a String representation of the JID.

Overrides:

toString in class Object

Returns:

a String representation of the JID.

hashCode

public int hashCode()

Overrides:

hashCode in class Object

equals

public boolean equals(Object object)

Overrides:

equals in class Object

compareTo

public int compareTo(JID jid)

Specified by:

compareTo in interface Comparable<JID>

equals

public static boolean equals(String jid1,
                             String jid2)

Returns true if two JID's are equivalent. The JID components are compared using the following rules:

• Nodes are normalized using nodeprep (case insensitive).
• Domains are normalized using IDNA and then nameprep (case insensitive).
• Resources are normalized using resourceprep (case sensitive).

These normalization rules ensure, for example, that User@EXAMPLE.com/home is considered equal to user@example.com/home.

Parameters:

jid1 - a JID.

jid2 - a JID.

Returns:

true if the JIDs are equivalent; false otherwise.

Throws:

IllegalArgumentException - if either JID is not valid.