org.scion.jpan.internal

Class DNSHelper

java.lang.Object

org.scion.jpan.internal.DNSHelper

public class DNSHelper
extends Object

Method Summary

Modifier and Type	Method and Description
static String	getScionDiscoveryAddress(String hostName)
static InetAddress	queryA(org.xbill.DNS.Name hostName)
static InetAddress	queryAAAA(org.xbill.DNS.Name hostName)
static <R> R	queryTXT(org.xbill.DNS.Name name, String key, Function<String,R> valueParser)
static <R> R	queryTXT(String hostName, String key, Function<String,R> valueParser) Perform a DNS lookup on "hostName" for a TXT entry with key "key".
static String	searchForDiscoveryService()

Methods inherited from class java.lang.Object

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

Method Detail

queryTXT

public static <R> R queryTXT(String hostName,
                             String key,
                             Function<String,R> valueParser)

Perform a DNS lookup on "hostName" for a TXT entry with key "key". All matching entries are forwarded to the "valueParser" until the "valueParser" returns not "null".

Type Parameters:

R - Result type.

Parameters:

hostName - host name

key - TXT key

valueParser - TXT value parsing function

Returns:

The result of "valueParser" or "null" if no matching entry was found or if "valueParser" returned "null" for all matching entries.

queryTXT

public static <R> R queryTXT(org.xbill.DNS.Name name,
                             String key,
                             Function<String,R> valueParser)

queryA

public static InetAddress queryA(org.xbill.DNS.Name hostName)

queryAAAA

public static InetAddress queryAAAA(org.xbill.DNS.Name hostName)

searchForDiscoveryService

public static String searchForDiscoveryService()

getScionDiscoveryAddress

public static String getScionDiscoveryAddress(String hostName)
                                       throws IOException

Throws:

IOException