org.glassfish.jersey.internal.routing.ContentTypeDeterminer Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of jaxrs-ri Show documentation
Show all versions of jaxrs-ri Show documentation
A bundle project producing JAX-RS RI bundles. The primary artifact is an "all-in-one" OSGi-fied JAX-RS RI bundle
(jaxrs-ri.jar).
Attached to that are two compressed JAX-RS RI archives. The first archive (jaxrs-ri.zip) consists of binary RI bits and
contains the API jar (under "api" directory), RI libraries (under "lib" directory) as well as all external
RI dependencies (under "ext" directory). The secondary archive (jaxrs-ri-src.zip) contains buildable JAX-RS RI source
bundle and contains the API jar (under "api" directory), RI sources (under "src" directory) as well as all external
RI dependencies (under "ext" directory). The second archive also contains "build.xml" ANT script that builds the RI
sources. To build the JAX-RS RI simply unzip the archive, cd to the created jaxrs-ri directory and invoke "ant" from
the command line.
/*
* Copyright (c) 2012, 2020 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 org.glassfish.jersey.internal.routing;
import org.glassfish.jersey.message.MessageBodyWorkers;
import org.glassfish.jersey.message.WriterModel;
import org.glassfish.jersey.message.internal.AcceptableMediaType;
import org.glassfish.jersey.message.internal.MediaTypes;
import jakarta.ws.rs.core.MediaType;
import jakarta.ws.rs.core.Response;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
import java.util.List;
/**
* Utility class containing methods used on both client and server side for determining media type of a response based
* on provided {@link MessageBodyWorkers}.
*/
public class ContentTypeDeterminer {
protected ContentTypeDeterminer(MessageBodyWorkers workers) {
this.workers = workers;
}
protected MessageBodyWorkers workers;
/**
* Determine the {@link MediaType} of the {@link Response} based on writers suitable for the given entity class,
* pre-selected method and acceptable media types.
*
* @param entityClass entity class to determine the media type for.
* @param entityType entity type for writers.
* @param selectedMethod pre-selected (invoked) method.
* @param acceptableMediaTypes acceptable media types from request.
* @param methodProducesTypes media types producible by resource method
* @return media type of the response.
*/
protected MediaType determineResponseMediaType(
final Class entityClass,
final Type entityType,
final RequestSpecificConsumesProducesAcceptor selectedMethod,
final List acceptableMediaTypes,
final List methodProducesTypes,
final Annotation[] handlingMethodAnnotations) {
// Entity class can be null when considering HEAD method || empty entity.
final Class responseEntityClass = entityClass;
// Applicable entity providers
final List writersForEntityType = workers.getWritersModelsForType(responseEntityClass);
CombinedMediaType selected = null;
for (final MediaType acceptableMediaType : acceptableMediaTypes) {
for (final MediaType methodProducesType : methodProducesTypes) {
if (!acceptableMediaType.isCompatible(methodProducesType)) {
// no need to go deeper if acceptable and method produces type are incompatible
continue;
}
// Use writers suitable for entity class to determine the media type.
for (final WriterModel model : writersForEntityType) {
for (final MediaType writerProduces : model.declaredTypes()) {
if (!writerProduces.isCompatible(acceptableMediaType)
|| !methodProducesType.isCompatible(writerProduces)) {
continue;
}
final CombinedMediaType.EffectiveMediaType effectiveProduces =
new CombinedMediaType.EffectiveMediaType(
MediaTypes.mostSpecific(methodProducesType, writerProduces),
false);
final CombinedMediaType candidate =
CombinedMediaType.create(acceptableMediaType, effectiveProduces);
if (candidate != CombinedMediaType.NO_MATCH) {
// Look for a better compatible worker.
if (selected == null || CombinedMediaType.COMPARATOR.compare(candidate, selected) < 0) {
if (model.isWriteable(
responseEntityClass,
entityType,
handlingMethodAnnotations,
candidate.getCombinedType())) {
selected = candidate;
}
}
}
}
}
}
}
// Found media type for current writer.
if (selected != null) {
return selected.getCombinedType();
}
// If the media type couldn't be determined, choose pre-selected one and wait whether interceptors change the mediaType
// so it can be written.
return selectedMethod.getProduces().getCombinedType();
}
}