[JAVA-304]: cursors with negative id were not being closed

Author: agirbal

src/main/com/mongodb/DBApiLayer.java

@@ -371,7 +371,7 @@ private void init( Response res ){
                 throw new MongoException.CursorNotFound();
             }
 
-            if (res._cursor > 0 && _limit > 0 && _limit - _numFetched <= 0) {
+            if (res._cursor != 0 && _limit > 0 && _limit - _numFetched <= 0) {
                 // fetched all docs within limit, close cursor server-side
                 killCursor();
             }
@@ -439,7 +439,7 @@ protected void finalize() throws Throwable {
                 long curId = _curResult.cursor();
                 _curResult = null;
                 _cur = null;
-                if (curId > 0) {
+                if (curId != 0) {
                     _deadCursorIds.add(new DeadCursor(curId, _host));
                 }
             }
@@ -477,7 +477,7 @@ void killCursor() {
             if (_curResult == null)
                 return;
             long curId = _curResult.cursor();
-            if (curId <= 0)
+            if (curId == 0)
                 return;
 
             List<Long> l = new ArrayList<Long>();

src/main/com/mongodb/Response.java

@@ -84,7 +84,7 @@ public Iterator<DBObject> iterator(){
     }
 
     public boolean hasGetMore( int queryOptions ){
-        if ( _cursor <= 0 )
+        if ( _cursor == 0 )
             return false;
 
         if ( _num > 0 )