de.weltraumschaf.commons.uri.Path Maven / Gradle / Ivy
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package de.weltraumschaf.commons.uri;
import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
/**
* Identifies the URI path that a resource class or class method will serve
* requests for.
*
* Paths are relative. For an annotated class the base URI is the
* application path, see {@code ApplicationPath}. For an annotated
* method the base URI is the
* effective URI of the containing class. For the purposes of absolutizing a
* path against the base URI , a leading '/' in a path is
* ignored and base URIs are treated as if they ended in '/'. E.g.:
*
* {@code
* @Path("widgets")
* public class WidgetsResource {
* @GET
* String getList() {...}
*
* @GET @Path("{id}")
* String getWidget(@PathParam("id") String id) {...}
* }
* }
*
* In the above, if the application path is
* {@code catalogue} and the application is deployed at
* {@code http://example.com/}, then {@code GET} requests for
* {@code http://example.com/catalogue/widgets} will be handled by the
* {@code getList} method while requests for
* http://example.com/catalogue/widgets/nnn (where
* nnn is some value) will be handled by the
* {@code getWidget} method. The same would apply if the value of either
* {@code @Path} annotation started with '/'.
*
* Classes and methods may also be annotated with {@code Consumes} and
* {@code Produces} to filter the requests they will receive.
*
* @author Paul Sandoz
* @author Marc Hadley
* @since 1.0
*/
@Target({ElementType.TYPE, ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
@Documented
@interface Path {
/**
* Defines a URI template for the resource class or method, must not
* include matrix parameters.
*
* Embedded template parameters are allowed and are of the form:
*
* param = "{" *WSP name *WSP [ ":" *WSP regex *WSP ] "}"
* name = (ALPHA / DIGIT / "_")*(ALPHA / DIGIT / "." / "_" / "-" ) ; \w[\w\.-]*
* regex = *( nonbrace / "{" *nonbrace "}" ) ; where nonbrace is any char other than "{" and "}"
*
* See {@code RFC 5234}
* for a description of the syntax used above and the expansions of
* {@code WSP}, {@code ALPHA} and {@code DIGIT}. In the above {@code name}
* is the template parameter name and the optional {@code regex} specifies
* the contents of the capturing group for the parameter. If {@code regex}
* is not supplied then a default value of {@code [^/]+} which terminates at
* a path segment boundary, is used. Matching of request URIs to URI
* templates is performed against encoded path values and implementations
* will not escape literal characters in regex automatically, therefore any
* literals in {@code regex} should be escaped by the author according to
* the rules of
* {@code RFC 3986 section 3.3}.
* Caution is recommended in the use of {@code regex}, incorrect use can
* lead to a template parameter matching unexpected URI paths. See
* {@code Pattern}
* for further information on the syntax of regular expressions.
* Values of template parameters may be extracted using {@code PathParam}.
*
* The literal part of the supplied value (those characters
* that are not part of a template parameter) is automatically percent
* encoded to conform to the {@code path} production of
* {@code RFC 3986 section 3.3}.
* Note that percent encoded values are allowed in the literal part of the
* value, an implementation will recognize such values and will not double
* encode the '%' character.
*
* @return TODO
*/
String value();
}