Package org.jivesoftware.smack.altconnections

Class HttpLookupMethod

java.lang.Object

org.jivesoftware.smack.altconnections.HttpLookupMethod

public final class HttpLookupMethod
extends Object

The HTTP lookup method uses web host metadata to list the URIs of alternative connection methods.

In order to obtain host-meta XRD element from the host in the form of an InputStream, use getXrdStream(DomainBareJid) method. To obtain endpoints for Bosh or Websocket connection endpoints from host, use HttpLookupMethod.LinkRelation.BOSH and HttpLookupMethod.LinkRelation.WEBSOCKET respectively with the lookup(DomainBareJid, LinkRelation) method. In case one is looking for endpoints described by other than BOSH or Websocket LinkRelation, use the more flexible lookup(DomainBareJid, String) method.

Example:

 
 DomainBareJid xmppServerAddress = JidCreate.domainBareFrom("example.org");
 List<URI> endpoints = HttpLookupMethod.lookup(xmppServiceAddress, LinkRelation.WEBSOCKET);
 
 

See Also:

• HTTP Lookup Method from XEP-0156.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static enum	HttpLookupMethod.LinkRelation	Specifies a link relation for the selected type of connection.

Constructor Summary

Constructors

Constructor	Description
HttpLookupMethod()

Method Summary

Modifier and Type	Method	Description
static InputStream	getXrdStream(DomainBareJid xmppServiceAddress)	Constructs a HTTP connection with the host specified by the DomainBareJid and retrieves XRD element in the form of an InputStream.
static List<URI>	lookup(DomainBareJid xmppServiceAddress, String relation)	Get remote endpoints for the given LinkRelation from host.
static List<URI>	lookup(DomainBareJid xmppServiceAddress, HttpLookupMethod.LinkRelation relation)	Get remote endpoints for the given LinkRelation from host.
static List<URI>	parseXrdLinkReferencesFor(XmlPullParser parser, String relation)	Get remote endpoints for the provided LinkRelation from provided XmlPullParser.
static List<URI>	parseXrdLinkReferencesFor(XmlPullParser parser, HttpLookupMethod.LinkRelation relation)	Get remote endpoints for the provided LinkRelation from provided XmlPullParser.

Methods inherited from class java.lang.Object

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

Constructor Details

HttpLookupMethod

public HttpLookupMethod()

Method Details

lookup

public static List<URI> lookup(DomainBareJid xmppServiceAddress,
 String relation)
                        throws IOException,
XmlPullParserException,
URISyntaxException

Get remote endpoints for the given LinkRelation from host.

Parameters:

xmppServiceAddress - address of host

relation - LinkRelation as a string specifying type of connection

Returns:

list of endpoints

Throws:

IOException - exception due to input/output operations

XmlPullParserException - exception encountered during XML parsing

URISyntaxException - exception to indicate that a string could not be parsed as a URI reference

lookup

public static List<URI> lookup(DomainBareJid xmppServiceAddress,
 HttpLookupMethod.LinkRelation relation)
                        throws IOException,
XmlPullParserException,
URISyntaxException

Get remote endpoints for the given LinkRelation from host.

Parameters:

xmppServiceAddress - address of host

relation - HttpLookupMethod.LinkRelation specifying type of connection

Returns:

list of endpoints

Throws:

IOException - exception due to input/output operations

XmlPullParserException - exception encountered during XML parsing

URISyntaxException - exception to indicate that a string could not be parsed as a URI reference

getXrdStream

public static InputStream getXrdStream(DomainBareJid xmppServiceAddress)
                                throws IOException

Constructs a HTTP connection with the host specified by the DomainBareJid and retrieves XRD element in the form of an InputStream. The method will throw a FileNotFoundException if host-meta isn't published.

Parameters:

xmppServiceAddress - address of host

Returns:

InputStream containing XRD element

Throws:

IOException - exception due to input/output operations

parseXrdLinkReferencesFor

public static List<URI> parseXrdLinkReferencesFor(XmlPullParser parser,
 String relation)
                                           throws IOException,
XmlPullParserException,
URISyntaxException

Get remote endpoints for the provided LinkRelation from provided XmlPullParser.

Parameters:

parser - XmlPullParser that contains LinkRelations

relation - type of endpoints specified by the given LinkRelation

Returns:

list of endpoints

Throws:

IOException - exception due to input/output operations

XmlPullParserException - exception encountered during XML parsing

URISyntaxException - exception to indicate that a string could not be parsed as a URI reference

parseXrdLinkReferencesFor

public static List<URI> parseXrdLinkReferencesFor(XmlPullParser parser,
 HttpLookupMethod.LinkRelation relation)
                                           throws IOException,
XmlPullParserException,
URISyntaxException

Get remote endpoints for the provided LinkRelation from provided XmlPullParser.

Parameters:

parser - XmlPullParser that contains LinkRelations

relation - type of endpoints specified by the given LinkRelation

Returns:

list of endpoints

Throws:

IOException - exception due to input/output operations

XmlPullParserException - exception encountered during XML parsing

URISyntaxException - exception to indicate that a string could not be parsed as a URI reference