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package javax.ws.rs;
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;
/**
* Binds the value of a URI template parameter or a path segment containing the template parameter
* to a resource method parameter, resource class field, or resource class bean property. The value
* is URL decoded unless this is disabled using the {@link Encoded @Encoded} annotation. A
* default value can be specified using the {@link DefaultValue @DefaultValue} annotation.
*
* The type of the annotated parameter, field or property must either:
*
*
* - Be {@link javax.ws.rs.core.PathSegment}, the value will be the final segment of the
* matching part of the path. See {@link javax.ws.rs.core.UriInfo} for a means of retrieving
* all request path segments.
*
- Be {@code List
}, the value will be a list of {@code
* PathSegment} corresponding to the path segment(s) that matched the named template
* parameter. See {@link javax.ws.rs.core.UriInfo} for a means of retrieving all request path
* segments.
* - Be a primitive type.
*
- Have a constructor that accepts a single String argument.
*
- Have a static method named {@code valueOf} or {@code fromString} that accepts a single
* String argument (see, for example, {@link Integer#valueOf(String)}).
*
- Have a registered implementation of {@link javax.ws.rs.ext.ParamConverterProvider} JAX-RS
* extension SPI that returns a {@link javax.ws.rs.ext.ParamConverter} instance capable of a
* "from string" conversion for the type.
*
*
* The injected value corresponds to the latest use (in terms of scope) of the path parameter.
* E.g. if a class and a sub-resource method are both annotated with a {@link Path @Path}
* containing the same URI template parameter, use of {@code @PathParam} on a sub-resource method
* parameter will bind the value matching URI template parameter in the method's {@code @Path}
* annotation.
*
*
Because injection occurs at object creation time, use of this annotation on resource class
* fields and bean properties is only supported for the default per-request resource class
* lifecycle. Resource classes using other lifecycles should only use this annotation on resource
* method parameters.
*
* @author Paul Sandoz
* @author Marc Hadley
* @see Encoded @Encoded
* @see DefaultValue @DefaultValue
* @see javax.ws.rs.core.PathSegment
* @see javax.ws.rs.core.UriInfo
* @since 1.0
*/
@Target({ElementType.PARAMETER, ElementType.METHOD, ElementType.FIELD})
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface PathParam {
/**
* Defines the name of the URI template parameter whose value will be used to initialize the value
* of the annotated method parameter, class field or property. See {@link Path#value()} for a
* description of the syntax of template parameters.
*
*
E.g. a class annotated with: {@code @Path("widgets/{id}")} can have methods annotated whose
* arguments are annotated with {@code @PathParam("id")}.
*/
String value();
}