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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2010-2014 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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 * 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
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 * and therefore, elected the GPL Version 2 license, then the option applies
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 */
package org.glassfish.jersey.message.internal;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
import java.nio.charset.Charset;

import javax.ws.rs.BadRequestException;
import javax.ws.rs.InternalServerErrorException;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.core.NoContentException;
import javax.ws.rs.ext.Providers;

import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;
import javax.xml.bind.UnmarshalException;
import javax.xml.bind.Unmarshaller;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.XmlType;
import javax.xml.transform.stream.StreamSource;

import org.glassfish.jersey.internal.LocalizationMessages;

/**
 * An abstract provider for JAXB types that are annotated with
 * {@link XmlRootElement} or {@link XmlType}.
 * 

 * Implementing classes may extend this class to provide specific marshalling
 * and unmarshalling behaviour.
 * 

 * When unmarshalling a {@link UnmarshalException} will result in a
 * {@link WebApplicationException} being thrown with a status of 400
 * (Client error), and a {@link JAXBException} will result in a
 * {@link WebApplicationException} being thrown with a status of 500
 * (Internal Server error).
 * 

 * When marshalling a {@link JAXBException} will result in a
 * {@link WebApplicationException} being thrown with a status of 500
 * (Internal Server error).
 *
 * @author Paul Sandoz
 * @author Marek Potociar (marek.potociar at oracle.com)
 */
public abstract class AbstractRootElementJaxbProvider extends AbstractJaxbProvider {

    public AbstractRootElementJaxbProvider(Providers ps) {
        super(ps);
    }

    public AbstractRootElementJaxbProvider(Providers ps, MediaType mt) {
        super(ps, mt);
    }

    @Override
    public boolean isReadable(Class type, Type genericType, Annotation annotations[], MediaType mediaType) {
        return (type.getAnnotation(XmlRootElement.class) != null
                || type.getAnnotation(XmlType.class) != null) && isSupported(mediaType);
    }

    @Override
    public boolean isWriteable(Class type, Type genericType, Annotation annotations[], MediaType mediaType) {
        return type.getAnnotation(XmlRootElement.class) != null && isSupported(mediaType);
    }

    @Override
    public final Object readFrom(
            Class type,
            Type genericType,
            Annotation annotations[],
            MediaType mediaType,
            MultivaluedMap httpHeaders,
            InputStream inputStream) throws IOException {

        try {
            final EntityInputStream entityStream = EntityInputStream.create(inputStream);
            if (entityStream.isEmpty()) {
                throw new NoContentException(LocalizationMessages.ERROR_READING_ENTITY_MISSING());
            }
            return readFrom(type, mediaType, getUnmarshaller(type, mediaType), entityStream);
        } catch (UnmarshalException ex) {
            throw new BadRequestException(ex);
        } catch (JAXBException ex) {
            throw new InternalServerErrorException(ex);
        }
    }

    /**
     * Unmarshal a JAXB type.
     * 

     * Implementing classes may override this method.
     *
     * @param type         the JAXB type
     * @param mediaType    the media type
     * @param u            the unmarshaller to use for unmarshalling.
     * @param entityStream the input stream to unmarshal from.
     * @return an instance of the JAXB type.
     * @throws javax.xml.bind.JAXBException
     */
    protected Object readFrom(Class type, MediaType mediaType,
                              Unmarshaller u, InputStream entityStream)
            throws JAXBException {
        if (type.isAnnotationPresent(XmlRootElement.class)) {
            return u.unmarshal(entityStream);
        } else {
            return u.unmarshal(new StreamSource(entityStream), type).getValue();
        }
    }

    @Override
    public final void writeTo(
            Object t,
            Class type,
            Type genericType,
            Annotation annotations[],
            MediaType mediaType,
            MultivaluedMap httpHeaders,
            OutputStream entityStream) throws IOException {
        try {
            final Marshaller m = getMarshaller(type, mediaType);
            final Charset c = getCharset(mediaType);
            if (c != UTF8) {
                m.setProperty(Marshaller.JAXB_ENCODING, c.name());
            }
            setHeader(m, annotations);
            writeTo(t, mediaType, c, m, entityStream);
        } catch (JAXBException ex) {
            throw new InternalServerErrorException(ex);
        }
    }

    /**
     * Marshal an instance of a JAXB type.
     * 

     * Implementing classes may override this method.
     *
     * @param t            the instance of the JAXB type.
     * @param mediaType    the meida type.
     * @param c            the character set to serialize characters to.
     * @param m            the marshaller to marshaller the instance of the JAXB type.
     * @param entityStream the output stream to marshal to.
     * @throws javax.xml.bind.JAXBException
     */
    protected void writeTo(Object t, MediaType mediaType, Charset c,
                           Marshaller m, OutputStream entityStream)
            throws JAXBException {
        m.marshal(t, entityStream);
    }
}
    

    

    

            

    

            



    
    






    
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