01: /*
02: * hammurapi-rules @mesopotamia.version@
03: * Hammurapi rules engine.
04: * Copyright (C) 2005 Hammurapi Group
05: *
06: * This program is free software; you can redistribute it and/or
07: * modify it under the terms of the GNU Lesser General Public
08: * License as published by the Free Software Foundation; either
09: * version 2 of the License, or (at your option) any later version.
10: *
11: * This program is distributed in the hope that it will be useful,
12: * but WITHOUT ANY WARRANTY; without even the implied warranty of
13: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14: * Lesser General Public License for more details.
15: *
16: * You should have received a copy of the GNU Lesser General Public
17: * License along with this library; if not, write to the Free Software
18: * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19: *
20: * URL: http://http://www.hammurapi.biz
21: * e-Mail: support@hammurapi.biz
22: */
23: package biz.hammurapi.dispatch;
24:
25: import biz.hammurapi.util.PoliteVisitor;
26:
27: /**
28: * Dispatches visited objects to visit- and leave- dispatchers.
29: * @author Pavel Vlasov
30: * @revision $Revision$
31: */
32: public class DispatchingVisitor implements PoliteVisitor {
33:
34: private Dispatcher visitDispatcher;
35: private Dispatcher leaveDispatcher;
36:
37: /**
38: * Creates DispatchingVisitor
39: * @param visitDispatcher
40: * @param leaveDispatcher
41: */
42: public DispatchingVisitor(Dispatcher visitDispatcher,
43: Dispatcher leaveDispatcher) {
44: super ();
45: this .visitDispatcher = visitDispatcher;
46: this .leaveDispatcher = leaveDispatcher;
47: }
48:
49: /**
50: * Passes argument to visit dispatcher.
51: */
52: public void leave(Object arg) {
53: if (leaveDispatcher != null) {
54: leaveDispatcher.dispatch(arg);
55: }
56: }
57:
58: /**
59: * Passes argument to leave dispatcher.
60: */
61: public boolean visit(Object arg) {
62: if (visitDispatcher != null) {
63: visitDispatcher.dispatch(arg);
64: }
65: return true;
66: }
67:
68: }
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