| /* |
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| |
| /* |
| * Request.java |
| * |
| * Created on September 27, 2007, 5:39 PM |
| * |
| */ |
| |
| 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 |
| * java.lang.IllegalStateException if called outside the scope of a request |
| * (e.g. from a provider constructor). |
| * |
| * Precondition processing (see the <code>evaluatePreconditions</code> methods) |
| * can result in either a <code>null</code> return value to indicate that |
| * preconditions have been met and that the request should continue, or |
| * a non-null return value to indicate that preconditions were not met. In the |
| * event that preconditions were not met, the returned <code>ResponseBuilder</code> |
| * instance will have an appropriate status and will also include a <code>Vary</code> |
| * header if the {@link #selectVariant} method was called prior to to calling |
| * <code>evaluatePreconditions</code>. It is the responsibility of the caller |
| * to check the status and add additional metadata if required. E.g., see |
| * <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.3.5">HTTP/1.1, section 10.3.5</a> |
| * for details of the headers that are expected to accompany a <code>304 Not Modified</code> |
| * response. |
| */ |
| public interface Request { |
| |
| /** |
| * Get the request method, e.g. GET, POST, etc. |
| * @return the request method |
| * @see javax.ws.rs.HttpMethod |
| */ |
| String getMethod(); |
| |
| /** |
| * Select the representation variant that best matches the request. 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. |
| * @see Variant.VariantListBuilder |
| * @throws java.lang.IllegalArgumentException if variants is empty or null |
| * @throws java.lang.IllegalStateException if called outside the scope of a request |
| */ |
| Variant selectVariant(List<Variant> variants) throws IllegalArgumentException; |
| |
| /** |
| * Evaluate request preconditions based on the passed in value. |
| * |
| * @param eTag an ETag for the current state of the resource |
| * @return null if the preconditions are met or a ResponseBuilder set with |
| * the appropriate status if the preconditions are not met. A returned |
| * ResponseBuilder will include an ETag header set with the value of eTag. |
| * @throws java.lang.IllegalArgumentException if eTag is null |
| * @throws java.lang.IllegalStateException if called outside the scope of a request |
| */ |
| 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 null if the preconditions are met or a ResponseBuilder set with |
| * the appropriate status if the preconditions are not met. |
| * @throws java.lang.IllegalArgumentException if lastModified is null |
| * @throws java.lang.IllegalStateException if called outside the scope of a request |
| */ |
| 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 null if the preconditions are met or a ResponseBuilder set with |
| * the appropriate status if the preconditions are not met. A returned |
| * ResponseBuilder will include an ETag header set with the value of eTag. |
| * @throws java.lang.IllegalArgumentException if lastModified or eTag is null |
| * @throws java.lang.IllegalStateException if called outside the scope of a request |
| */ |
| 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 <a |
| * href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.24"> |
| * If-Match: *</a>} and {@link <a |
| * href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.26"> |
| * If-None-Match: *</a>} preconditions. |
| * |
| * <p>Note that both preconditions <code>If-None-Match: *</code> and |
| * <code>If-None-Match: <i>something</i></code> 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</code> on a resource that does not exist might succeed whereas |
| * a <code>GET</code> 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.</p> |
| * |
| * @return null if the preconditions are met or a ResponseBuilder set with |
| * the appropriate status if the preconditions are not met. |
| * @throws java.lang.IllegalStateException if called outside the scope of |
| * a request |
| */ |
| ResponseBuilder evaluatePreconditions(); |
| } |