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 test.dbc.stack;
23:
24: /**
25: *
26: * @author <a href="mailto:kabir.khan@jboss.org">Kabir Khan</a>
27: * @version $Revision: 57186 $
28: * @@org.jboss.aspects.dbc.Dbc
29: * @@org.jboss.aspects.dbc.Invariant ({"!$tgt.isEmpty() implies $tgt.top() != null", "$tgt.isEmpty() implies $tgt.elements.size() == 0"})
30: */
31: public interface Stack {
32: /**
33: * @@org.jboss.aspects.dbc.PreCond ({"$0 != null"})
34: * @@org.jboss.aspects.dbc.PostCond ({"!$tgt.isEmpty()", "$tgt.top() == $0"})
35: */
36: void push(Object o);
37:
38: /**
39: * @@org.jboss.aspects.dbc.PreCond ({"!$tgt.isEmpty()"})
40: */
41: Object pop();
42:
43: /**
44: * @@org.jboss.aspects.dbc.PreCond ({"!$tgt.isEmpty()"})
45: */
46: Object top();
47:
48: boolean isEmpty();
49: }
|