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• MessageBodyWriter.java

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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2010-2012 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * http://glassfish.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
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 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
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package javax.ws.rs.ext;

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

import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;

/**
 * Contract for a provider that supports the conversion of a Java type to a
 * stream.
 *
 * A {@code MessageBodyWriter} implementation may be annotated
 * with {@link javax.ws.rs.Produces} to restrict the media types for which it will
 * be considered suitable.
 * 

 * Providers implementing {@code MessageBodyWriter} contract must be either programmatically
 * registered in a JAX-RS runtime or must be annotated with
 * {@link javax.ws.rs.ext.Provider @Provider} annotation to be automatically discovered
 * by the JAX-RS runtime during a provider scanning phase.
 * 
 *
 * @param  the type that can be written.
 * @author Paul Sandoz
 * @author Marc Hadley
 * @see Provider
 * @see javax.ws.rs.Produces
 * @since 1.0
 */
public interface MessageBodyWriter {

    /**
     * Ascertain if the MessageBodyWriter supports a particular type.
     *
     * @param type        the class of instance that is to be written.
     * @param genericType the type of instance to be written, obtained either
     *                    by reflection of a resource method return type or via inspection
     *                    of the returned instance. {@link javax.ws.rs.core.GenericEntity}
     *                    provides a way to specify this information at runtime.
     * @param annotations an array of the annotations attached to the message entity instance.
     * @param mediaType   the media type of the HTTP entity.
     * @return {@code true} if the type is supported, otherwise {@code false}.
     */
    public boolean isWriteable(Class type, Type genericType,
                               Annotation[] annotations, MediaType mediaType);

    /**
     * Originally, the method has been called before {@code writeTo} to ascertain the length in bytes of
     * the serialized form of {@code t}. A non-negative return value has been used in a HTTP
     * {@code Content-Length} header.
     * 

     * As of JAX-RS 2.0, the method has been deprecated and the value returned by the method is ignored
     * by a JAX-RS runtime. All {@code MessageBodyWriter} implementations are advised to return {@code -1}
     * from the method. Responsibility to compute the actual {@code Content-Length} header value has been
     * delegated to JAX-RS runtime.
     * 
     *
     * @param t           the instance to write
     * @param type        the class of instance that is to be written.
     * @param genericType the type of instance to be written. {@link javax.ws.rs.core.GenericEntity}
     *                    provides a way to specify this information at runtime.
     * @param annotations an array of the annotations attached to the message entity instance.
     * @param mediaType   the media type of the HTTP entity.
     * @return length in bytes or -1 if the length cannot be determined in advance.
     */
    public long getSize(T t, Class type, Type genericType, Annotation[] annotations,
                        MediaType mediaType);

    /**
     * Write a type to an HTTP message. The message header map is mutable
     * but any changes must be made before writing to the output stream since
     * the headers will be flushed prior to writing the message body.
     *
     * @param t            the instance to write.
     * @param type         the class of instance that is to be written.
     * @param genericType  the type of instance to be written. {@link javax.ws.rs.core.GenericEntity}
     *                     provides a way to specify this information at runtime.
     * @param annotations  an array of the annotations attached to the message entity instance.
     * @param mediaType    the media type of the HTTP entity.
     * @param httpHeaders  a mutable map of the HTTP message headers.
     * @param entityStream the {@link OutputStream} for the HTTP entity. The
     *                     implementation should not close the output stream.
     * @throws java.io.IOException if an IO error arises.
     * @throws javax.ws.rs.WebApplicationException
     *                             if a specific HTTP error response needs to be produced.
     *                             Only effective if thrown prior to the message being committed.
     */
    public void writeTo(T t, Class type, Type genericType, Annotation[] annotations,
                        MediaType mediaType,
                        MultivaluedMap httpHeaders,
                        OutputStream entityStream)
            throws java.io.IOException, javax.ws.rs.WebApplicationException;
}