How to read a Lucene index?

Question

I'm working on a project for which I want to build a tag cloud by reading a Lucene index and pruning it down. I didn't set up the Lucene engine, it was someone else in the team, now I just want to read its index. Do you how to do that in Java?

Answer 1

Not sure what you mean by "reading" an Index:

1. If you want to query it you can use IndexSearcher class.

2. IndexReader allows you to open the index in read mode.

If you want to view the contents of the index, you can use Luke

Answer 2

You do it like this -

IndexReader r = IndexReader.open( "prdb_index");

int num = r.numDocs();
for ( int i = 0; i < num; i++)
{
    if ( ! r.isDeleted( i))
    {
        Document d = r.document( i);
        System.out.println( "d=" +d);
    }
}
r.close();