Hi
I'm trying to alter some output in a REST call. I want to wrap the JSON
output with a callback name. I've managed to get a filter to work (all my
attempts to get the OutInterceptor to work have failed). So now I've got a
message object.
To alter the message I thought I could use something like JSONStream os =
message.getContent(JSONStream.class); but this returns null. Anyone have an
idea how I can alter the JSON.
JAXRS Output filters are invoked immediately after the invocation has returned but before a given method response has been
serialized into the output message.
So I think what you need to do in your response handler is to replace the actual OutputStream.class with a buffered/filter one,
wrapping the original one.
What will happen next is that a JSONProvider will write into this stream and I guess at this moment you can transfrom the incoming
output bytes.
It's basically doing same thing you can do with Servlet filters.
Default JSONProvider does not append a JSONStream.class.
As such another option is actually write a custom JSON MessageVBodyWriter, possibly either extending the default one or simple
copying its code and updating its wtiteTo() method to do a pre-request specific JSON or something like that.
Providers can have @Contexts like UriInfo, etc, injected so one can get some
additional info from there.
Does it make sense or am I missing the point ?
Cheers, Sergey
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