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package org.glassfish.jersey.linking;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
import java.net.URI;
import javax.ws.rs.core.Link;
import org.glassfish.jersey.Beta;
/**
* Specifies a link injection target in a returned representation bean. May be
* used on fields of type String or URI. One of {@link #value()} or
* {@link #resource()} must be specified.
*
* @author Mark Hadley
* @author Gerard Davison (gerard.davison at oracle.com)
*/
@Target({ElementType.FIELD, ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Beta
public @interface InjectLink {
/**
* Styles of URI supported
*/
public enum Style {
/**
* An absolute URI. The URI template will be prefixed with the absolute
* base URI of the application.
*/
ABSOLUTE,
/**
* An absolute path. The URI template will be prefixed with the absolute
* base path of the application.
*/
ABSOLUTE_PATH,
/**
* A relative path. The URI template will be converted to a relative
* path with no prefix.
*/
RELATIVE_PATH
}
/**
* The style of URI to inject
*/
Style style() default Style.ABSOLUTE_PATH;
/**
* Specifies a URI template that will be used to build the injected URI. The
* template may contain both URI template parameters (e.g. {id}) and EL
* expressions (e.g. ${instance.id}) using the same implicit beans as
* {@link Binding#value()}. URI template parameter values are resolved as
* described in {@link #resource()}. E.g. the following three alternatives
* are equivalent:
* <pre>
* @Ref("{id}")
* @Ref(value="{id}", bindings={
* @Binding(name="id" value="${instance.id}"}
* )
* @Ref("${instance.id}")
* </pre>
*/
String value() default "";
/**
* Specifies a resource class whose @Path URI template will be used to build
* the injected URI. Embedded URI template parameter values are resolved as
* follows:
* <ol>
* <li>If the {@link #bindings()} property contains a binding specification
* for the parameter then that is used</li>
* <li>Otherwise an implicit binding is used that extracts the value of a
* bean property by the same name as the URI template from the implicit
* {@code instance} bean (see {@link Binding}).</li>
* </ol>
* <p>
* E.g. assuming a resource class {@code SomeResource} with the
* following {@code @Path("{id}")} annotation, the following two
* alternatives are therefore equivalent:</p>
* <pre>
* @Ref(resource=SomeResource.class)
* @Ref(resource=SomeResource.class, bindings={
* @Binding(name="id" value="${instance.id}"}
* )
* </pre>
*/
Class<?> resource() default Class.class;
/**
* Used in conjunction with {@link #resource()} to specify a subresource
* locator or method. The value is the name of the method. The value of the
* method's @Path annotation will be appended to the value of the
* class-level @Path annotation separated by '/' if necessary.
*/
String method() default "";
/**
* Specifies the bindings for embedded URI template parameters.
*
* @see Binding
*/
Binding[] bindings() default {};
/**
* Specifies a boolean EL expression whose value determines whether a Ref is
* set (true) or not (false). Omission of a condition will always insert a
* ref.
*/
String condition() default "";
// Link properties
//
/**
* Specifies the relationship.
*/
String rel() default "";
/**
* Specifies the reverse relationship.
*/
String rev() default "";
/**
* Specifies the media type.
*/
String type() default "";
/**
* Specifies the title.
*/
String title() default "";
/**
* Specifies the anchor
*/
String anchor() default "";
/**
* Specifies the media
*/
String media() default "";
/**
* Specifies the lang of the referenced resource
*/
String hreflang() default "";
/**
* Specifies extension parameters as name-value pairs.
*/
Extension[] extensions() default {};
@Target({ElementType.TYPE, ElementType.FIELD})
@Retention(RetentionPolicy.RUNTIME)
public @interface Extension {
/**
* Specifies the name of the extension parameter
*/
String name();
/**
* Specifies the value of the extension parameter
*/
String value();
}
public static class Util {
public static Link buildLinkFromUri(URI uri, InjectLink link) {
javax.ws.rs.core.Link.Builder builder = javax.ws.rs.core.Link.fromUri(uri);
if (link.rel().length() != 0) {
builder = builder.rel(link.rel());
}
if (link.rev().length() != 0) {
builder = builder.param("rev", link.rev());
}
if (link.type().length() != 0) {
builder = builder.type(link.type());
}
if (link.title().length() != 0) {
builder = builder.param("title", link.title());
}
if (link.anchor().length() != 0) {
builder = builder.param("anchor", link.anchor());
}
if (link.media().length() != 0) {
builder = builder.param("media", link.media());
}
if (link.hreflang().length() != 0) {
builder = builder.param("hreflang", link.hreflang());
}
for (InjectLink.Extension ext : link.extensions()) {
builder = builder.param(ext.name(), ext.value());
}
return builder.build();
}
}
}