/*******************************************************************************
 * Copyright (c) 2017 Politecnico di Torino and others.
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Apache License, Version 2.0
 * which accompanies this distribution, and is available at
 * http://www.apache.org/licenses/LICENSE-2.0
 *******************************************************************************/
package it.polito.verigraph.deserializer;

import java.io.IOException;
import java.io.InputStream;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
import javax.ws.rs.Consumes;
import javax.ws.rs.ProcessingException;
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 javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;

import it.polito.neo4j.jaxb.Paths;

@Provider
@Consumes(MediaType.APPLICATION_XML)
public class PathsMessageBodyReader implements MessageBodyReader<Paths>{

    @Override
    public boolean isReadable(Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) {
        return type == Paths.class;
    }

    @Override
    public Paths readFrom(Class<Paths> type, Type genericType, Annotation[] annotations, MediaType mediaType,
            MultivaluedMap<String, String> httpHeaders, InputStream entityStream)
                    throws IOException, WebApplicationException {
        try {
            JAXBContext jaxbContext = JAXBContext.newInstance(Paths.class);
            Paths paths = (Paths) jaxbContext.createUnmarshaller()
                    .unmarshal(entityStream);
            return paths;
        } catch (JAXBException jaxbException) {
            throw new ProcessingException("Error deserializing a Paths object.",
                    jaxbException);
        }
    }

}