jakarta.ws.rs.core.Request Maven / Gradle / Ivy
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* Copyright (c) 2010, 2019 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0, which is available at
* http://www.eclipse.org/legal/epl-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception, which is available at
* https://www.gnu.org/software/classpath/license.html.
*
* SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
*/
package jakarta.ws.rs.core;
import java.util.Date;
import java.util.List;
import jakarta.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 jakarta.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 If-Match: * and
* 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();
}
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