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Java > Open Source Codes > org > jboss > ejb > plugins > cmp > ejbql > ASTIsEmpty


1 /*
2 * JBoss, Home of Professional Open Source
3 * Copyright 2005, JBoss Inc., and individual contributors as indicated
4 * by the @authors tag. See the copyright.txt in the distribution for a
5 * full listing of individual contributors.
6 *
7 * This is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU Lesser General Public License as
9 * 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 empty condition.
28  *
29  * @author <a HREF="mailto:dain@daingroup.com">Dain Sundstrom</a>
30  * @version $Revision: 37459 $
31  */
32 public final class ASTIsEmpty extends SimpleNode {
33    public boolean not;
34
35    public ASTIsEmpty(int id) {
36       super(id);
37    }
38
39    public String JavaDoc toString() {
40       return SQLUtil.IS + (not ? SQLUtil.NOT : SQLUtil.EMPTY_STRING) + SQLUtil.EMPTY;
41    }
42
43    /** Accept the visitor. **/
44    public Object JavaDoc jjtAccept(JBossQLParserVisitor visitor, Object JavaDoc data) {
45       return visitor.visit(this, data);
46    }
47 }
48
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