package org.jboss.resteasy.plugins.providers;

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

import javax.ws.rs.Consumes;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.ext.MessageBodyReader;
import javax.ws.rs.ext.MessageBodyWriter;
import javax.ws.rs.ext.Provider;

import org.jboss.resteasy.util.HttpHeaderNames;

/**
 * @author <a href="mailto:bill@burkecentral.com">BillBurke</a>
 * @version $Revision: 1 $
 */
@Provider
@Produces("*/*")
@Consumes("*/*")
public class InputStreamProvider implements MessageBodyReader<InputStream>, MessageBodyWriter<InputStream>
{
   public boolean isReadable(Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType)
   {
	// return type.equals(InputStream.class);
	   // Patched by BetaCONCEPT
	   // The original code commented above requires the provided concrete stream class 
	   //to be the same as the abstract class "InputStream"
	   return InputStream.class.isAssignableFrom(type);
   }

   public InputStream readFrom(Class<InputStream> type, Type genericType, Annotation[] annotations, MediaType mediaType, MultivaluedMap<String, String> httpHeaders, InputStream entityStream) throws IOException
   {
      return entityStream;
   }

   public boolean isWriteable(Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType)
   {
      return InputStream.class.isAssignableFrom(type);
   }

   public long getSize(InputStream inputStream, Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType)
   {
      return -1;
   }

   public void writeTo(InputStream inputStream, Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType, MultivaluedMap<String, Object> httpHeaders, OutputStream entityStream) throws IOException
   {
      int c = inputStream.read();
      if (c == -1)
      {
         httpHeaders.putSingle(HttpHeaderNames.CONTENT_LENGTH, Integer.toString(0));
         entityStream.write(new byte[0]); // fix RESTEASY-204
         return;
      }
      else
         entityStream.write(c);
      while ((c = inputStream.read()) != -1)
      {
         entityStream.write(c);
      }
   }
}