// Random rnd is passed in so that the exact same random query may be created
// more than once.
public static BooleanQuery RandBoolQuery(Random rnd, bool allowMust, int level, string field, string[] vals, ICallback cb)
{
BooleanQuery current = new BooleanQuery(rnd.Next() < 0);
for (int i = 0; i < rnd.Next(vals.Length) + 1; i++)
{
int qType = 0; // term query
if (level > 0)
{
qType = rnd.Next(10);
}
Query q;
if (qType < 3)
{
q = new TermQuery(new Term(field, vals[rnd.Next(vals.Length)]));
}
else if (qType < 4)
{
Term t1 = new Term(field, vals[rnd.Next(vals.Length)]);
Term t2 = new Term(field, vals[rnd.Next(vals.Length)]);
PhraseQuery pq = new PhraseQuery();
pq.Add(t1);
pq.Add(t2);
pq.Slop = 10; // increase possibility of matching
q = pq;
}
else if (qType < 7)
{
q = new WildcardQuery(new Term(field, "w*"));
}
else
{
q = RandBoolQuery(rnd, allowMust, level - 1, field, vals, cb);
}
int r = rnd.Next(10);
Occur occur;
if (r < 2)
{
occur = Occur.MUST_NOT;
}
else if (r < 5)
{
if (allowMust)
{
occur = Occur.MUST;
}
else
{
occur = Occur.SHOULD;
}
}
else
{
occur = Occur.SHOULD;
}
current.Add(q, occur);
}
if (cb != null)
{
cb.PostCreate(current);
}
return(current);
}