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Jakarta RESTful Web Services MessageBodyReader and MessageBodyWriter to support JsonValue API of Jakarta JSON Processing
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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2012-2013 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:
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 * elects to include this software in this distribution under the [CDDL or GPL
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 * only if the new code is made subject to such option by the copyright
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 */

package org.glassfish.json.jaxrs;

import javax.annotation.PostConstruct;
import javax.json.*;
import javax.json.stream.JsonGenerator;
import javax.ws.rs.*;
import javax.ws.rs.core.Configuration;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.ext.MessageBodyWriter;
import javax.ws.rs.ext.Provider;
import java.io.IOException;
import java.io.OutputStream;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
import java.util.HashMap;
import java.util.Map;

/**
 * JAX-RS MessageBodyWriter for JsonStructure. This allows
 * JsonStructure, JsonArray and JsonObject to be return type of a
 * resource method.
 *
 * @author Jitendra Kotamraju
 * @author Blaise Doughan
 * @author Michal Gajdos
 */
@Provider
@Produces({"application/json", "text/json", "*/*"})
public class JsonStructureBodyWriter implements MessageBodyWriter {
    private static final String JSON = "json";
    private static final String PLUS_JSON = "+json";

    private JsonWriterFactory wf = Json.createWriterFactory(null);

    @Context
    private Configuration config;       // TODO : not working

    @PostConstruct
    private void init() {               // TODO : not working
        Map props = new HashMap();
        if (config != null && config.getProperties().containsKey(JsonGenerator.PRETTY_PRINTING)) {
            props.put(JsonGenerator.PRETTY_PRINTING, true);
        }
        wf = Json.createWriterFactory(props);
    }

    @Override
    public boolean isWriteable(Class aClass,
            Type type, Annotation[] annotations, MediaType mediaType) {
        return JsonStructure.class.isAssignableFrom(aClass) && supportsMediaType(mediaType);
    }

    /**
     * @return true for all media types of the pattern */json and
     * */*+json.
     */
    private static boolean supportsMediaType(final MediaType mediaType) {
        return mediaType.getSubtype().equals(JSON) || mediaType.getSubtype().endsWith(PLUS_JSON);
    }

    @Override
    public long getSize(JsonStructure jsonStructure, Class aClass,
            Type type, Annotation[] annotations, MediaType mediaType) {

        return -1;
    }

    @Override
    public void writeTo(JsonStructure jsonStructure, Class aClass, Type type,
            Annotation[] annotations, MediaType mediaType,
            MultivaluedMap stringObjectMultivaluedMap,
            OutputStream outputStream) throws IOException, WebApplicationException {
		JsonWriter writer = wf.createWriter(outputStream);
        try {
            writer.write(jsonStructure);
        } finally {
			writer.close();
		}
    }
}