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package javax.ws.rs.core;
import java.util.Date;
import java.util.List;
import javax.ws.rs.core.Response.ResponseBuilder;
/**
* An injectable helper for request processing, all methods throw an
* {@link IllegalStateException} if called outside the scope of a request
* (e.g. from a provider constructor).
*
* Precondition processing (see the {@code evaluatePreconditions} methods)
* can result in either a {@code null} return value to indicate that
* preconditions have been met and that the request should continue, or
* a non-{@code null} return value to indicate that preconditions were not met. In the
* event that preconditions were not met, the returned {@code ResponseBuilder}
* instance will have an appropriate status and will also include a {@code Vary}
* header if the {@link #selectVariant(List)} method was called prior to to calling
* {@code evaluatePreconditions}. It is the responsibility of the caller
* to check the status and add additional metadata if required. E.g., see
* HTTP/1.1, section 10.3.5
* for details of the headers that are expected to accompany a {@code 304 Not Modified}
* response.
*
* @author Paul Sandoz
* @author Marc Hadley
* @author Marek Potociar
* @since 1.0
*/
public interface Request {
/**
* Get the request method, e.g. GET, POST, etc.
*
* @return the request method.
* @see javax.ws.rs.HttpMethod
*/
public String getMethod();
/**
* Select the representation variant that best matches the request. Returns
* {@code null} in case there is no matching variant in the list.
*
* More explicit variants are chosen ahead of less explicit ones. A vary header
* is computed from the supplied list and automatically added to the response.
*
*
* @param variants a list of Variant that describe all of the available representation
* variants.
* @return the variant that best matches the request or {@code null} if there's no match.
* @throws java.lang.IllegalArgumentException
* if variants is empty or {@code null}.
* @throws java.lang.IllegalStateException
* if called outside the scope of a request.
* @see Variant.VariantListBuilder
*/
public Variant selectVariant(List variants);
/**
* Evaluate request preconditions based on the passed in value.
*
* @param eTag an ETag for the current state of the resource
* @return {@code null} if the preconditions are met or a {@code ResponseBuilder} set with
* the appropriate status if the preconditions are not met. A returned
* {@code ResponseBuilder} will include an ETag header set with the value of eTag,
* provided none of the precondition evaluation has failed, in which case
* the ETag header would not be included and the status code of the returned
* {@code ResponseBuilder} would be set to {@link Response.Status#PRECONDITION_FAILED}.
* @throws java.lang.IllegalArgumentException
* if eTag is {@code null}.
* @throws java.lang.IllegalStateException
* if called outside the scope of a request.
*/
public ResponseBuilder evaluatePreconditions(EntityTag eTag);
/**
* Evaluate request preconditions based on the passed in value.
*
* @param lastModified a date that specifies the modification date of the resource
* @return {@code null} if the preconditions are met or a {@code ResponseBuilder} set with
* the appropriate status if the preconditions are not met.
* @throws java.lang.IllegalArgumentException
* if lastModified is {@code null}.
* @throws java.lang.IllegalStateException
* if called outside the scope of a request.
*/
public ResponseBuilder evaluatePreconditions(Date lastModified);
/**
* Evaluate request preconditions based on the passed in value.
*
* @param lastModified a date that specifies the modification date of the resource
* @param eTag an ETag for the current state of the resource
* @return {@code null} if the preconditions are met or a {@code ResponseBuilder} set with
* the appropriate status if the preconditions are not met. A returned
* {@code ResponseBuilder} will include an ETag header set with the value of eTag,
* provided none of the precondition evaluation has failed, in which case
* the ETag header would not be included and the status code of the returned
* {@code ResponseBuilder} would be set to {@link Response.Status#PRECONDITION_FAILED}.
* @throws java.lang.IllegalArgumentException
* if lastModified or eTag is {@code null}.
* @throws java.lang.IllegalStateException
* if called outside the scope of a request.
*/
public ResponseBuilder evaluatePreconditions(Date lastModified, EntityTag eTag);
/**
* Evaluate request preconditions for a resource that does not currently
* exist. The primary use of this method is to support the {@link
* If-Match: *} and {@link
* If-None-Match: *} preconditions.
*
* Note that both preconditions {@code If-None-Match: *} and
* If-None-Match: something will always be considered to
* have been met and it is the applications responsibility
* to enforce any additional method-specific semantics. E.g. a
* {@code PUT} on a resource that does not exist might succeed whereas
* a {@code GET} on a resource that does not exist would likely result
* in a 404 response. It would be the responsibility of the application to
* generate the 404 response.
*
* @return {@code null} if the preconditions are met or a {@code ResponseBuilder} set with
* the appropriate status if the preconditions are not met.
* @throws IllegalStateException if called outside the scope of a request.
* @since 1.1
*/
public ResponseBuilder evaluatePreconditions();
}