javax.ws.rs.core

Class Link

java.lang.Object

javax.ws.rs.core.Link

Direct Known Subclasses:

LinkImpl

public abstract class Link
extends Object

Class representing hypermedia links. A hypermedia link may include additional parameters beyond its underlying URI. Parameters such as rel or type provide additional meta-data. Links in responses can be followed by creating an Invocation.Builder or a WebTarget.

The methods toString() and valueOf(java.lang.String) can be used to serialize and de-serialize a link into a link header (RFC 5988).

Since:

2.0

Author:

Marek Potociar, Santiago Pericas-Geertsen

See Also:

Client.invocation(javax.ws.rs.core.Link), Client.target(javax.ws.rs.core.Link), Response.getLink(java.lang.String)

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static interface	Link.Builder Builder class for hypermedia links.
static class	Link.JaxbAdapter An implementation of JAXB XmlAdapter that maps the JAX-RS Link type to a value that can be marshalled and unmarshalled by JAXB.
static class	Link.JaxbLink Value type for Link that can be marshalled and unmarshalled by JAXB.

Field Summary

Fields

Modifier and Type	Field and Description
static String	REL Rel link param from RFC 5988.
static String	TITLE Title link param from RFC 5988.
static String	TYPE Type link param from RFC 5988.

Constructor Summary

Constructors

Constructor and Description
Link()

Method Summary

Methods

Modifier and Type	Method and Description
static Link.Builder	fromLink(Link link) Create a new builder instance initialized from another link.
static Link.Builder	fromMethod(Class<?> resource, String method) Convenience method to build a link from a resource.
static Link.Builder	fromPath(String path) Convenience method to build a link from a path.
static Link.Builder	fromResource(Class<?> resource) Convenience method to build a link from a resource.
static Link.Builder	fromUri(String uri) Create a new builder instance initialized from an existing URI represented as a string.
static Link.Builder	fromUri(URI uri) Create a new builder instance initialized from an existing URI.
static Link.Builder	fromUriBuilder(UriBuilder uriBuilder) Create a new builder instance initialized from a URI builder.
abstract Map<String,String>	getParams() Returns an immutable map that includes all the link parameters defined on this link.
abstract String	getRel() Returns the value associated with the link rel param, or null if this param is not specified.
abstract List<String>	getRels() Returns the value associated with the link rel param as a list of strings or the empty list if rel is not defined.
abstract String	getTitle() Returns the value associated with the link title param, or null if this param is not specified.
abstract String	getType() Returns the value associated with the link type param, or null if this param is not specified.
abstract URI	getUri() Returns the underlying URI associated with this link.
abstract UriBuilder	getUriBuilder() Convenience method that returns a UriBuilder initialized with this link's underlying URI.
abstract String	toString() Returns a string representation as a link header (RFC 5988).
static Link	valueOf(String value) Simple parser to convert link header string representations into a link.

Methods inherited from class java.lang.Object

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

Field Detail

TITLE

public static final String TITLE

Title link param from RFC 5988.

See Also:

Constant Field Values

REL

public static final String REL

Rel link param from RFC 5988.

See Also:

Constant Field Values

TYPE

public static final String TYPE

Type link param from RFC 5988.

See Also:

Constant Field Values

Constructor Detail

Link

public Link()

Method Detail

getUri

public abstract URI getUri()

Returns the underlying URI associated with this link.

Returns:

underlying URI.

getUriBuilder

public abstract UriBuilder getUriBuilder()

Convenience method that returns a UriBuilder initialized with this link's underlying URI.

Returns:

UriBuilder initialized using underlying URI.

getRel

public abstract String getRel()

Returns the value associated with the link rel param, or null if this param is not specified.

Returns:

relation types as string or null.

getRels

public abstract List<String> getRels()

Returns the value associated with the link rel param as a list of strings or the empty list if rel is not defined.

Returns:

relation types as list of strings or empty list.

getTitle

public abstract String getTitle()

Returns the value associated with the link title param, or null if this param is not specified.

Returns:

value of title parameter or null.

getType

public abstract String getType()

Returns the value associated with the link type param, or null if this param is not specified.

Returns:

value of type parameter or null.

getParams

public abstract Map<String,String> getParams()

Returns an immutable map that includes all the link parameters defined on this link. If defined, this map will include entries for rel, title and type.

Returns:

immutable map of link parameters.

toString

public abstract String toString()

Returns a string representation as a link header (RFC 5988). All link params are serialized as link-param="value" where value is a quoted-string. For example, ; title="employee"; rel="manager friend"

Overrides:

toString in class Object

Returns:

string link header representation for this link.

valueOf

public static Link valueOf(String value)

Simple parser to convert link header string representations into a link.

 link ::= '<' uri '>' (';' link-param)*
 link-param ::= name '=' quoted-string
 

See RFC 5988 for more information.

Parameters:

value - String representation.

Returns:

newly parsed link.

Throws:

IllegalArgumentException - if a syntax error is found.

See Also:

Link.Builder.link(java.lang.String)

fromUri

public static Link.Builder fromUri(URI uri)

Create a new builder instance initialized from an existing URI.

Parameters:

uri - a URI that will be used to initialize the builder.

Returns:

a new builder.

Throws:

IllegalArgumentException - if uri is null.

fromUri

public static Link.Builder fromUri(String uri)

Create a new builder instance initialized from an existing URI represented as a string.

Parameters:

uri - a URI that will be used to initialize the builder.

Returns:

a new builder.

Throws:

IllegalArgumentException - if uri is null.

fromUriBuilder

public static Link.Builder fromUriBuilder(UriBuilder uriBuilder)

Create a new builder instance initialized from a URI builder.

Parameters:

uriBuilder - instance of URI builder.

Returns:

a new builder.

fromLink

public static Link.Builder fromLink(Link link)

Create a new builder instance initialized from another link.

Parameters:

link - other link used for initialization.

Returns:

a new builder.

fromPath

public static Link.Builder fromPath(String path)

Convenience method to build a link from a path. Equivalent to fromUriBuilder(UriBuilder.fromPath(path)).

Parameters:

path - a URI path that will be used to initialize the Link, may contain URI template parameters.

Returns:

a new Link.Builder.

Throws:

IllegalArgumentException - if path is null.

fromResource

public static Link.Builder fromResource(Class<?> resource)

Convenience method to build a link from a resource. Equivalent to Link.fromUriBuilder(UriBuilder.fromResource(resource)). Note that the link URI passed to the Link.Builder instance returned by this method is relative. Should the link be built as absolute, a base URI has to be specified in the builder prior to building the new link instance. For example, on a server side a UriInfo.getBaseUri() may be typically used to define the base URI of a link created using this method.

Parameters:

resource - a root resource whose Path value will be used to initialize the builder.

Returns:

a new link builder instance.

Throws:

IllegalArgumentException - if resource is not annotated with Path or resource is null.

See Also:

UriInfo.getBaseUri()

fromMethod

public static Link.Builder fromMethod(Class<?> resource,
                      String method)

Convenience method to build a link from a resource. Equivalent to Link.fromUriBuilder(UriBuilder.fromMethod(resource, method)). Note that the link URI passed to the Link.Builder instance returned by this method is relative. Should the link be built as absolute, a base URI has to be specified in the builder prior to building the new link instance. For example, on a server side a UriInfo.getBaseUri() may be typically used to define the base URI of a link created using this method.

Parameters:

resource - the resource containing the method.

method - the name of the method whose Path value will be used to obtain the path to append.

Returns:

the updated Link.Builder.

Throws:

IllegalArgumentException - if resource or method is null, or there is more than or less than one variant of the method annotated with Path.

See Also:

UriInfo.getBaseUri()