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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.
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 * GPL Classpath Exception:
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package org.glassfish.json.jaxrs;

import javax.json.Json;
import javax.json.JsonReader;
import javax.json.JsonReaderFactory;
import javax.json.JsonStructure;
import javax.ws.rs.Consumes;
import javax.ws.rs.Produces;
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 java.io.IOException;
import java.io.InputStream;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;

/**
 * JAX-RS MessageBodyReader for JsonStructure. This allows
 * JsonStructure, JsonArray and JsonObject to be a parameter of a
 * resource method.
 *
 * @author Jitendra Kotamraju
 * @author Blaise Doughan
 * @author Michal Gajdos
 */
@Provider
@Consumes({"application/json", "text/json", "*/*"})
public class JsonStructureBodyReader implements MessageBodyReader {
    private final JsonReaderFactory rf = Json.createReaderFactory(null);

    private static final String JSON = "json";
    private static final String PLUS_JSON = "+json";

    @Override
    public boolean isReadable(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 JsonStructure readFrom(Class jsonStructureClass,
            Type type, Annotation[] annotations, MediaType mediaType,
            MultivaluedMap stringStringMultivaluedMap,
            InputStream inputStream) throws IOException, WebApplicationException {
		JsonReader reader = rf.createReader(inputStream);
		try {
			return reader.read();
		} finally {
			reader.close();	
		}
    }
}