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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
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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.ParameterizedType;
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.JAXBElement;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;
import javax.xml.bind.UnmarshalException;
import javax.xml.bind.Unmarshaller;

import org.glassfish.jersey.internal.LocalizationMessages;

/**
 * An abstract provider for {@link JAXBElement}.
 * 
 * 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 AbstractJaxbElementProvider extends AbstractJaxbProvider> {

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

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

    @Override
    public boolean isReadable(Class type, Type genericType, Annotation annotations[], MediaType mediaType) {
        return type == JAXBElement.class && genericType instanceof ParameterizedType && isSupported(mediaType);
    }

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

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

        final EntityInputStream entityStream = EntityInputStream.create(inputStream);
        if (entityStream.isEmpty()) {
            throw new NoContentException(LocalizationMessages.ERROR_READING_ENTITY_MISSING());
        }

        final ParameterizedType pt = (ParameterizedType) genericType;
        final Class ta = (Class) pt.getActualTypeArguments()[0];

        try {
            return readFrom(ta, mediaType, getUnmarshaller(ta, mediaType), entityStream);
        } catch (UnmarshalException ex) {
            throw new BadRequestException(ex);
        } catch (JAXBException ex) {
            throw new InternalServerErrorException(ex);
        }
    }

    protected abstract JAXBElement readFrom(Class type, MediaType mediaType, Unmarshaller u, InputStream entityStream)
            throws JAXBException;

    @Override
    public final void writeTo(
            JAXBElement t,
            Class type,
            Type genericType,
            Annotation annotations[],
            MediaType mediaType,
            MultivaluedMap httpHeaders,
            OutputStream entityStream) throws IOException {
        try {
            final Marshaller m = getMarshaller(t.getDeclaredType(), 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);
        }
    }

    protected abstract void writeTo(JAXBElement t, MediaType mediaType, Charset c,
                                    Marshaller m, OutputStream entityStream)
            throws JAXBException;
}