ProgressStatusEventJsonReader.java

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 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
 * https://glassfish.dev.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:
 * "Portions Copyright [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 com.sun.enterprise.admin.remote.reader;

import java.io.IOException;
import java.io.InputStream;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.List;
import javax.ws.rs.Consumes;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.ext.MessageBodyReader;
import javax.ws.rs.ext.Provider;
import org.codehaus.jackson.JsonFactory;
import org.codehaus.jackson.JsonParser;
import org.codehaus.jackson.JsonToken;
import org.glassfish.api.admin.progress.ProgressStatusDTO;
import org.glassfish.api.admin.progress.ProgressStatusEvent;
import org.glassfish.api.admin.progress.ProgressStatusEvent.Changed;

/**
 *
 * @author mmares
 */
@Provider
@Consumes(MediaType.APPLICATION_JSON)
public class ProgressStatusEventJsonReader implements MessageBodyReader<ProgressStatusEvent> {
    
    private static final JsonFactory factory = new JsonFactory();
    
    @Override
    public boolean isReadable(Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) {
        return type.isAssignableFrom(ProgressStatusEvent.class);
    }
    
    @Override
    public ProgressStatusEvent readFrom(Class<ProgressStatusEvent> type, Type genericType, Annotation[] annotations, 
                    MediaType mediaType, MultivaluedMap<String, String> httpHeaders, 
                    InputStream entityStream) throws IOException, WebApplicationException {
        JsonParser jp = factory.createJsonParser(entityStream);
        try {
            JsonToken token = jp.nextToken(); //sorounding object
            jp.nextToken(); //Name progress-status-event
            JsonToken token2 = jp.nextToken();
            if (token != JsonToken.START_OBJECT || 
                    token2 != JsonToken.START_OBJECT ||
                    !"progress-status-event".equals(jp.getCurrentName())) {
                throw new IOException("Not expected type (progress-status-event) but (" + jp.getCurrentName() + ")");
            }
            return readProgressStatusEvent(jp);
        } finally {
            jp.close();
        }
    }
    
    public static ProgressStatusEvent readProgressStatusEvent(JsonParser jp) throws IOException {
        ProgressStatusDTO source = null;
        List<Changed> changed = new ArrayList<Changed>();
        String message = null;
        boolean spinner = false;
        int allocatedSteps = 0;
        String parentId = null;
        while (jp.nextToken() != JsonToken.END_OBJECT) {
            String fieldname = jp.getCurrentName();
            jp.nextToken(); // move to value
            if ("message".equals(fieldname)) {
                message = jp.getText();
            } else if ("spinner".equals(fieldname)) {
                spinner = jp.getBooleanValue();
            } else if ("allocated-steps".equals(fieldname)) {
                allocatedSteps = jp.getIntValue();
            } else if ("parent-id".equals(fieldname)) {
                parentId = jp.getText();
            } else if ("changed".equals(fieldname)) {
                while (jp.nextToken() != JsonToken.END_ARRAY) {
                    changed.add(Changed.valueOf(jp.getText()));
                }
            } else if ("progress-status".equals(fieldname)) {
                source = ProgressStatusDTOJsonReader.readProgressStatus(jp);
            }
        }
        return new ProgressStatusEvent(source, parentId, message, spinner, allocatedSteps, changed.toArray(new Changed[changed.size()]));
    }
    
}