Exactly what I was trying to do. Thanks.

On 15/12/2009, at 4:25 PM, TCK wrote:

How about the following?

BooleanQuery bq1 = new BooleanQuery();
bq1.add(new PrefixQuery(new
Term("heading",word)),BooleanClause.Occur.SHOULD);
bq1.add(new PrefixQuery(new
Term("attribute",word)),BooleanClause.Occur.SHOULD);

BooleanQuery bq = new BooleanQuery();
bq.add(bq1, BooleanClause.Occur.MUST);
if(subjectId.length()>0)
   bq.add(new PrefixQuery(new Term("subject_id",subjectId)),
BooleanClause.Occur.MUST);

I think bq should now be your desired query.

-TCK


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