01: /*
02: * JBoss, Home of Professional Open Source.
03: * Copyright 2006, Red Hat Middleware LLC, and individual contributors
04: * as indicated by the @author tags. See the copyright.txt file in the
05: * distribution for a full listing of individual contributors.
06: *
07: * This is free software; you can redistribute it and/or modify it
08: * under the terms of the GNU Lesser General Public License as
09: * published by the Free Software Foundation; either version 2.1 of
10: * the License, or (at your option) any later version.
11: *
12: * This software is distributed in the hope that it will be useful,
13: * but WITHOUT ANY WARRANTY; without even the implied warranty of
14: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15: * Lesser General Public License for more details.
16: *
17: * You should have received a copy of the GNU Lesser General Public
18: * License along with this software; if not, write to the Free
19: * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
20: * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
21: */
22: package org.jboss.ejb.plugins.cmp.ejbql;
23:
24: import org.jboss.ejb.plugins.cmp.jdbc.SQLUtil;
25:
26: /**
27: * This abstract syntax node represents an is null comparison.
28: *
29: * @author <a href="mailto:dain@daingroup.com">Dain Sundstrom</a>
30: * @version $Revision: 57209 $
31: */
32: public final class ASTNullComparison extends SimpleNode {
33: public boolean not;
34:
35: public ASTNullComparison(int id) {
36: super (id);
37: }
38:
39: public String toString() {
40: return (not ? SQLUtil.NOT : SQLUtil.EMPTY_STRING)
41: + SQLUtil.NULL;
42: }
43:
44: /** Accept the visitor. **/
45: public Object jjtAccept(JBossQLParserVisitor visitor, Object data) {
46: return visitor.visit(this, data);
47: }
48: }
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