Package dk.netarkivet.common.utils

Class DomainUtils

java.lang.Object

dk.netarkivet.common.utils.DomainUtils

public final class DomainUtils
extends Object

Utilities for working with domain names.

Field Summary

Fields

Modifier and Type	Field	Description
static String	DOMAINNAME_CHAR_REGEX_STRING	Valid characters in a domain name, according to RFC3490.

Method Summary

Modifier and Type	Method	Description
static String	domainNameFromHostname(String hostname)	Return a domain name.
static boolean	isValidDomainName(String domainName)	Check if a given domainName is valid domain.
static String	reduceHostname(String hostname)	Reduce a hostname to a more readable form.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

DOMAINNAME_CHAR_REGEX_STRING

public static final String DOMAINNAME_CHAR_REGEX_STRING

Valid characters in a domain name, according to RFC3490.

See Also:

Constant Field Values

Method Detail

isValidDomainName

public static boolean isValidDomainName(String domainName)

Check if a given domainName is valid domain. A valid domain is an IP address or a domain name part followed by a TLD as defined in settings.

Parameters:

domainName - A name of a domain (netarkivet.dk)

Returns:

true if domain is valid; otherwise it returns false.

domainNameFromHostname

public static String domainNameFromHostname(String hostname)

Return a domain name. A domain name is defined as either an IP address if the given host is an IP address, or a postfix of the given host name containing one hostname part and a TLD as defined in settings.

E.g. if '.dk' and 'co.uk' are valid TLDs, www.netarchive.dk will be become netarchive.dk and news.bbc.co.uk will be come bbc.co.uk

Parameters:

hostname - A hostname or IP address. Null hostname is not allowed

Returns:

A domain name (foo.bar) or IP address, or null if no valid domain could be obtained from the given hostname. If non-null, the return value is guaranteed to be a valid domain as determined by isValidDomainName().

reduceHostname

public static String reduceHostname(String hostname)
                             throws ArgumentNotValid

Reduce a hostname to a more readable form.

Parameters:

hostname - A host name, should not be null.

Returns:

The same host name with all domain parts stripped off.

Throws:

ArgumentNotValid - if argument isn't valid.