Examples for Chapter 6 - RESTful Java with JAX-RS 2.0 - page 289

public public boolean boolean isReadable ( Class type , Type genericType ,

Annotation [] annotations , MediaType mediaType )
{

return return Serializable . class . isAssignableFrom ( type );

}

public public boolean boolean isWriteable ( Class type , Type genericType ,

Annotation [] annotations , MediaType mediaType )

{

return return Serializable . class . isAssignableFrom ( type );

}

For the isReadable() and isWriteable() methods, we just check to see if our Java type
implements the java.io.Serializable interface:

public public Object readFrom ( Class type , Type genericType ,

Annotation [] annotations , MediaType mediaType ,
MultivaluedMap httpHeaders ,
InputStream is )

throws throws IOException , WebApplicationException

{

ObjectInputStream ois = new new ObjectInputStream ( is );

try try

{

return return ois . readObject ();

}
catch catch ( ClassNotFoundException e )

{

throw throw new new RuntimeException ( e );

}

}

The readFrom() method uses basic Java serialization to read a Java object from the HTTP
input stream:

public public long long getSize ( Object o , Class type ,

Type genericType , Annotation [] annotations ,
MediaType mediaType )

{

return return − 1 ;

}

The getSize() method returns -1. It is impossible to figure out the exact length of our mar-
shalled Java object without serializing it into a byte buffer and counting the number of bytes.
We're better off letting the servlet container figure this out for us. The getSize() method
has actually been deprecated in JAX-RS 2.0.