From ffc746e3d008338c7ae2bf0af83429f444c8061f Mon Sep 17 00:00:00 2001
From: Daniel Naber <dnaber@apache.org>
Date: Sun, 14 Nov 2004 13:26:28 +0000
Subject: [PATCH] throw IllegalArgumentException for nDocs <= 0 to avoid
 NullPointerException

PR: 32227
Submitted by: Paul Elschot


git-svn-id: https://svn.apache.org/repos/asf/lucene/java/trunk@150641 13f79535-47bb-0310-9956-ffa450edef68
---
 src/java/org/apache/lucene/search/IndexSearcher.java | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/java/org/apache/lucene/search/IndexSearcher.java b/src/java/org/apache/lucene/search/IndexSearcher.java
index 630eef261b5..80822568058 100644
--- a/src/java/org/apache/lucene/search/IndexSearcher.java
+++ b/src/java/org/apache/lucene/search/IndexSearcher.java
@@ -83,6 +83,10 @@ public class IndexSearcher extends Searcher {
   // inherit javadoc
   public TopDocs search(Query query, Filter filter, final int nDocs)
        throws IOException {
+
+    if (nDocs <= 0)  // null might be returned from hq.top() below.
+      throw new IllegalArgumentException("nDocs must be > 0");
+
     Scorer scorer = query.weight(this).scorer(reader);
     if (scorer == null)
       return new TopDocs(0, new ScoreDoc[0]);