mime types, parsers, filters

I am trying to set up search for a few million files.  There are no web
servers.

It is very important that I be able to specify the type of document
during search,

so I have set up in indexer.conf to treat every recognizable mime type
distinctly,

 

For example, mime type text/plain is restricted to just .txt files.

 

AddType text/plain                      *.txt

 

while Java source is

 

AddType text/x-java-source              *.java

 

so I added this :

 

Mime text/x-java-source   text/plain

 

This caused the search terms to be recognized only if they were in the
name of the java

source file itself, not in the document body.

 

So, I did this

 

Mime text/x-java-source   text/plain /bin/cat

 

and reindexed the test directory, and now the search is able to see the
java source code

itself.  So I have basically a trivial filter.  However, it seems like I
should not have to do this.

My question is, 

 

Is there a way to tell mnogosearch to index a document as if it were
mime type

X even but store the attributes for the document as mime type Y?

 

In this case I want mnogosearch to store java-source as the mime type
but to index the

document as text/plain otherwise.  The "cat" trick does work, but I get
the feeling I am

missing something.  I should not need an external parser at all.

 

Where did I go wrong?

 

Stefan