Add SimpleText codec
--------------------
Key: LUCENE-2664
URL: https://issues.apache.org/jira/browse/LUCENE-2664
Project: Lucene - Java
Issue Type: Improvement
Components: Index
Reporter: Michael McCandless
Assignee: Michael McCandless
Fix For: 4.0
Inspired by Sahin Buyrukbilen's question here:
http://www.lucidimagination.com/search/document/b68846e383824653/how_to_export_lucene_index_to_a_simple_text_file#b68846e383824653
I made a simple read/write codec that stores all postings data into a
single text file (_X.pst), looking like this:
{noformat}
field contents
term file
doc 0
pos 5
term is
doc 0
pos 1
term second
doc 0
pos 3
term test
doc 0
pos 4
term the
doc 0
pos 2
term this
doc 0
pos 0
END
{noformat}
The codec is fully funtional -- all Lucene & Solr tests pass with
-Dtests.codec=SimpleText -- but, its performance is obviously poor.
However, it should be useful for debugging, transparency,
understanding just what Lucene stores in its index, etc. And it's a
quick way to gain some understanding on how a codec works...
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