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• Providers.java

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/*
 * Copyright (c) 2010, 2017 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 javax.ws.rs.ext;

import java.lang.annotation.Annotation;
import java.lang.reflect.Type;

import javax.ws.rs.core.MediaType;

/**
 * An injectable interface providing runtime lookup of provider instances.
 *
 * @author Paul Sandoz
 * @author Marc Hadley
 * @see javax.ws.rs.core.Context
 * @see MessageBodyReader
 * @see MessageBodyWriter
 * @see ContextResolver
 * @see ExceptionMapper
 * @since 1.0
 */
public interface Providers {

    /**
     * Get a message body reader that matches a set of criteria. The set of
     * readers is first filtered by comparing the supplied value of
     * {@code mediaType} with the value of each reader's
     * {@link javax.ws.rs.Consumes}, ensuring the supplied value of
     * {@code type} is assignable to the generic type of the reader, and
     * eliminating those that do not match.
     * The list of matching readers is then ordered with those with the best
     * matching values of {@link javax.ws.rs.Consumes} (x/y > x/* > */*)
     * sorted first. Finally, the
     * {@link MessageBodyReader#isReadable(Class, Type, Annotation[], MediaType)}
     * method is called on each reader in order using the supplied criteria and
     * the first reader that returns {@code true} is selected and returned.
     *
     * @param          type of the the object that is to be read.
     * @param type        the class of the object that is to be read.
     * @param genericType the type of object to be produced. E.g. if the
     *                    message body is to be converted into a method parameter, this will be
     *                    the formal type of the method parameter as returned by
     *                    {@code Class.getGenericParameterTypes}.
     * @param annotations an array of the annotations on the declaration of the
     *                    artifact that will be initialized with the produced instance. E.g. if
     *                    the message body is to be converted into a method parameter, this will
     *                    be the annotations on that parameter returned by
     *                    {@code Class.getParameterAnnotations}.
     * @param mediaType   the media type of the data that will be read.
     * @return a MessageBodyReader that matches the supplied criteria or {@code null}
     *         if none is found.
     */
     MessageBodyReader getMessageBodyReader(Class type,
                                                  Type genericType, Annotation[] annotations, MediaType mediaType);

    /**
     * Get a message body writer that matches a set of criteria. The set of
     * writers is first filtered by comparing the supplied value of
     * {@code mediaType} with the value of each writer's
     * {@link javax.ws.rs.Produces}, ensuring the supplied value of
     * {@code type} is assignable to the generic type of the reader, and
     * eliminating those that do not match.
     * The list of matching writers is then ordered with those with the best
     * matching values of {@link javax.ws.rs.Produces} (x/y > x/* > */*)
     * sorted first. Finally, the
     * {@link MessageBodyWriter#isWriteable(Class, Type, Annotation[], MediaType)}
     * method is called on each writer in order using the supplied criteria and
     * the first writer that returns {@code true} is selected and returned.
     *
     * @param          type of the object that is to be written.
     * @param type        the class of the object that is to be written.
     * @param genericType the type of object to be written. E.g. if the
     *                    message body is to be produced from a field, this will be
     *                    the declared type of the field as returned by {@code Field.getGenericType}.
     * @param annotations an array of the annotations on the declaration of the
     *                    artifact that will be written. E.g. if the
     *                    message body is to be produced from a field, this will be
     *                    the annotations on that field returned by
     *                    {@code Field.getDeclaredAnnotations}.
     * @param mediaType   the media type of the data that will be written.
     * @return a MessageBodyReader that matches the supplied criteria or {@code null}
     *         if none is found.
     */
     MessageBodyWriter getMessageBodyWriter(Class type,
                                                  Type genericType, Annotation[] annotations, MediaType mediaType);

    /**
     * Get an exception mapping provider for a particular class of exception.
     * Returns the provider whose generic type is the nearest superclass of
     * {@code type}.
     *
     * @param   type of the exception handled by the exception mapping provider.
     * @param type the class of exception.
     * @return an {@link ExceptionMapper} for the supplied type or {@code null}
     *         if none is found.
     */
     ExceptionMapper getExceptionMapper(Class type);

    /**
     * Get a context resolver for a particular type of context and media type.
     * The set of resolvers is first filtered by comparing the supplied value of
     * {@code mediaType} with the value of each resolver's
     * {@link javax.ws.rs.Produces}, ensuring the generic type of the context
     * resolver is assignable to the supplied value of {@code contextType}, and
     * eliminating those that do not match. If only one resolver matches the
     * criteria then it is returned. If more than one resolver matches then the
     * list of matching resolvers is ordered with those with the best
     * matching values of {@link javax.ws.rs.Produces} (x/y > x/* > */*)
     * sorted first. A proxy is returned that delegates calls to
     * {@link ContextResolver#getContext(java.lang.Class)} to each matching context
     * resolver in order and returns the first non-null value it obtains or null
     * if all matching context resolvers return null.
     *
     * @param          type of the context.
     * @param contextType the class of context desired.
     * @param mediaType   the media type of data for which a context is required.
     * @return a matching context resolver instance or {@code null} if no matching
     *         context providers are found.
     */
     ContextResolver getContextResolver(Class contextType,
                                              MediaType mediaType);
}