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Java EE 6 example source code file (MessageListWriter.java)

This example Java EE 6 source code file (MessageListWriter.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Java EE 6 tags/keywords

annotation, annotation, class, class, context, ejb, io, mediatype, mediatype, messagelistwriter, net, network, outputstream, parameterizedtype, reflection, servlet, type, type, uri, webapplicationexception

The Java EE 6 MessageListWriter.java source code

 * Copyright 1997-2007 Sun Microsystems, Inc. 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 https://jersey.dev.java.net/CDDL+GPL.html
 * or jersey/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 jersey/legal/LICENSE.txt.
 * Sun designates this particular file as subject to the "Classpath" exception
 * as provided by Sun in the GPL Version 2 section of the License file that
 * accompanied this code.  If applicable, add the following below the License
 * Header, with the fields enclosed by brackets [] replaced by your own
 * identifying information: "Portions Copyrighted [year]
 * [name of copyright owner]"
 * Contributor(s):
 * 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
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.

package enterprise.messageboard.entities;

import java.io.IOException;
import java.io.OutputStream;
import java.lang.annotation.Annotation;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.net.URI;
import java.util.List;
import javax.ejb.Stateless;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.core.UriInfo;
import javax.ws.rs.ext.MessageBodyWriter;
import javax.ws.rs.ext.Provider;

public class MessageListWriter implements MessageBodyWriter<List {

    @Context UriInfo ui;

    public boolean isWriteable(Class<?> clazz, Type type, Annotation[] annotation, MediaType mediaType) {
        return verifyGenericType(type);

    private boolean verifyGenericType(Type genericType) {
        if (!(genericType instanceof ParameterizedType)) return false;

        final ParameterizedType pt = (ParameterizedType)genericType;

        if (pt.getActualTypeArguments().length > 1) return false;

        if (!(pt.getActualTypeArguments()[0] instanceof Class)) return false;

        final Class listClass = (Class)pt.getActualTypeArguments()[0];
        return listClass == Message.class;

    public long getSize(List<Message> messages, Class clazz, Type type, Annotation[] annotation, MediaType mediaType) {
        return -1;

    public void writeTo(List<Message> messages, Class clazz, Type type, Annotation[] annotation, MediaType mediaType, MultivaluedMap arg5, OutputStream ostream) throws IOException, WebApplicationException {
        for (Message m : messages) {
            URI mUri = ui.getAbsolutePathBuilder().path(Integer.toString(m.getUniqueId())).build();
            ostream.write((" <a href='" + mUri.toASCIIString() + "'>link
").getBytes()); } } }

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