package org.jboss.resteasy.test.providers.jaxb.resource;


import org.jboss.resteasy.core.ExceptionAdapter;

import javax.ws.rs.core.MediaType;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBElement;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Unmarshaller;
import javax.xml.stream.XMLStreamReader;
import java.io.InputStream;

public final class XmlJaxbProvidersHelper {

   /**
    * An HTTP Header than can be passed in order to have the XML response formatted.
    */
   public static final String FORMAT_XML_HEADER = "X-Xml-Formatted";

   private XmlJaxbProvidersHelper() {
   }

   public static <T> JAXBElement<T> unmarshall(Class<T> type, InputStream entityStream) {
      XMLStreamReader reader = XmlStreamFactory.getXMLStreamReader(entityStream);
      return unmarshall(type, entityStream, reader);
   }

   public static <T> JAXBElement<T> unmarshall(Class<T> type,
                                                InputStream entityStream,
                                                XMLStreamReader reader) {
      JAXBContext jaxb = JAXBCache.instance().getJAXBContext(type);
      return unmarshall(jaxb, type, entityStream, reader);
   }

   public static <T> JAXBElement<T> unmarshall(JAXBContext jaxb,
                                                Class<T> type,
                                                InputStream entityStream,
                                                XMLStreamReader reader) {
      try {
         Unmarshaller unmarshaller = jaxb.createUnmarshaller();
         JAXBElement<T> e = unmarshaller.unmarshal(reader, type);
         return e;
      } catch (JAXBException e) {
         throw new ExceptionAdapter(e);
      }
   }

   public static String getCharset(final MediaType mediaType) {
      if (mediaType != null) {
         return mediaType.getParameters().get("charset");
      }
      return null;
   }


}
