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Java > Open Source Codes > org > jboss > aspects > dbc > condition > parser > Expression


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.aspects.dbc.condition.parser;
23
24 /**
25  *
26  * @author <a HREF="mailto:kabir.khan@jboss.org">Kabir Khan</a>
27  * @version $Revision: 37406 $
28  */
29 public abstract class Expression
30 {
31    protected Expression parent;
32    
33    protected Expression()
34    {
35       
36    }
37    
38    protected void setParent(Expression parent)
39    {
40       this.parent = parent;
41    }
42    
43    protected abstract void accept(ExpressionVisitor visitor);
44    
45    protected boolean isTopLevel()
46    {
47       return parent == null;
48    }
49 }
50
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