Module com.aoapps.net.types

Package com.aoapps.net

Class DomainName

java.lang.Object

com.aoapps.net.DomainName

All Implemented Interfaces:

DtoFactory<DomainName>, FastExternalizable, Internable<DomainName>, Externalizable, Serializable, Comparable<DomainName>

public final class DomainName
extends Object
implements Comparable<DomainName>, FastExternalizable, DtoFactory<DomainName>, Internable<DomainName>

Represents a DNS domain name. Domain names must:

• Be non-null
• Be non-empty
• May not be "default" (case-insensitive) - to avoid conflicts with Cyrus no-domain configurations.
• Conform to definition in https://wikipedia.org/wiki/Hostname#Internet_hostnames and https://wikipedia.org/wiki/DNS_label#Parts_of_a_domain_name
• May be "localhost" or "localhost.localdomain" - other checks that conflict with this are skipped.
• Last domain label must be alphabetic (not be all numeric)
• Last label must be a valid top level domain.
• For reverse IP address delegation, if the domain ends with ".in-addr.arpa", the first label may also be in the format "##/##".
• Not end with a period (.)

Author:

AO Industries, Inc.

See Also:

• Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
static final DomainName	LOCALHOST
static final DomainName	LOCALHOST_LOCALDOMAIN
static final int	MAX_LENGTH

Constructor Summary

Constructors

Constructor	Description
DomainName()	Deprecated. Only required for implementation, do not use directly.

Method Summary

Modifier and Type	Method	Description
static int	compareLabels(String labels1, String labels2)	TODO: Should not be public once all classes using validator types.
int	compareTo(DomainName other)	Sorts by top level domain, then subdomain, then sub-subdomain, ...
boolean	equals(Object obj)
DomainName	getDto()
long	getSerialVersionUID()
int	hashCode()
DomainName	intern()	Interns this domain much in the same fashion as String.intern().
boolean	isArpa()
static boolean	isArpa(String domain)	Checks if ends with .in-addr.arpa (case insensitive).
void	readExternal(ObjectInput in)
String	toLowerCase()	Gets the lower-case form of the domain.
String	toString()
static ValidationResult	validate(String domain)	Validates a domain name, but doesn't allow an ending period.
static DomainName	valueOf(String domain)
void	writeExternal(ObjectOutput out)

Methods inherited from class java.lang.Object

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

Field Details

MAX_LENGTH

public static final int MAX_LENGTH

See Also:

• Constant Field Values

LOCALHOST

public static final DomainName LOCALHOST

LOCALHOST_LOCALDOMAIN

public static final DomainName LOCALHOST_LOCALDOMAIN

Constructor Details

DomainName

@Deprecated
public DomainName()

Deprecated.

Only required for implementation, do not use directly.

See Also:

• FastExternalizable

Method Details

isArpa

public static boolean isArpa(String domain)

Checks if ends with .in-addr.arpa (case insensitive).

Performance measurement of new implementation versus old (10,000,000 iterations):
     "This is not an arpa"
         Old: 2911.130028 ms
         New: 37.805258 ms
         Improvement: 77.0 times
     "this is not an arpa"
         Old: 1746.381520 ms
         New: 50.407891 ms
         Improvement: 34.7 times
     "subnet0.144.71.64.in-addr.arpa"
         Old: 2712.463721 ms
         New: 284.561373 ms
         Improvement: 9.5 times

validate

public static ValidationResult validate(String domain)

Validates a domain name, but doesn't allow an ending period.

See Also:

• DomainLabel.validate(java.lang.String)

valueOf

public static DomainName valueOf(String domain)
                          throws ValidationException

Parameters:

domain - when null, returns null

Throws:

ValidationException

equals

public boolean equals(Object obj)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

compareLabels

public static int compareLabels(String labels1,
 String labels2)

TODO: Should not be public once all classes using validator types.

compareTo

public int compareTo(DomainName other)

Sorts by top level domain, then subdomain, then sub-subdomain, ...

Specified by:

compareTo in interface Comparable<DomainName>

toString

public String toString()

Overrides:

toString in class Object

toLowerCase

public String toLowerCase()

Gets the lower-case form of the domain. If two different domains are interned and their toLowerCase is the same String instance, then they are equal in case-insensitive manner.

isArpa

public boolean isArpa()

intern

public DomainName intern()

Interns this domain much in the same fashion as String.intern().

Specified by:

intern in interface Internable<DomainName>

See Also:

• String.intern()

getDto

public DomainName getDto()

Specified by:

getDto in interface DtoFactory<DomainName>

getSerialVersionUID

public long getSerialVersionUID()

Specified by:

getSerialVersionUID in interface FastExternalizable

writeExternal

public void writeExternal(ObjectOutput out)
                   throws IOException

Specified by:

writeExternal in interface Externalizable

Throws:

IOException

readExternal

public void readExternal(ObjectInput in)
                  throws IOException,
ClassNotFoundException

Specified by:

readExternal in interface Externalizable

Throws:

IOException

ClassNotFoundException