001 /* 002 * hammurapi-rules @mesopotamia.version@ 003 * Hammurapi rules engine. 004 * Copyright (C) 2005 Hammurapi Group 005 * 006 * This program is free software; you can redistribute it and/or 007 * modify it under the terms of the GNU Lesser General Public 008 * License as published by the Free Software Foundation; either 009 * version 2 of the License, or (at your option) any later version. 010 * 011 * This program is distributed in the hope that it will be useful, 012 * but WITHOUT ANY WARRANTY; without even the implied warranty of 013 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 014 * Lesser General Public License for more details. 015 * 016 * You should have received a copy of the GNU Lesser General Public 017 * License along with this library; if not, write to the Free Software 018 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 019 * 020 * URL: http://http://www.hammurapi.biz 021 * e-Mail: support@hammurapi.biz 022 */ 023 package biz.hammurapi.dispatch; 024 025 import biz.hammurapi.util.PoliteVisitor; 026 027 /** 028 * Dispatches visited objects to visit- and leave- dispatchers. 029 * @author Pavel Vlasov 030 * @revision $Revision$ 031 */ 032 public class DispatchingVisitor implements PoliteVisitor { 033 034 private Dispatcher visitDispatcher; 035 private Dispatcher leaveDispatcher; 036 037 /** 038 * Creates DispatchingVisitor 039 * @param visitDispatcher 040 * @param leaveDispatcher 041 */ 042 public DispatchingVisitor(Dispatcher visitDispatcher, Dispatcher leaveDispatcher) { 043 super(); 044 this.visitDispatcher=visitDispatcher; 045 this.leaveDispatcher=leaveDispatcher; 046 } 047 048 /** 049 * Passes argument to visit dispatcher. 050 */ 051 public void leave(Object arg) { 052 if (leaveDispatcher!=null) { 053 leaveDispatcher.dispatch(arg); 054 } 055 } 056 057 /** 058 * Passes argument to leave dispatcher. 059 */ 060 public boolean visit(Object arg) { 061 if (visitDispatcher!=null) { 062 visitDispatcher.dispatch(arg); 063 } 064 return true; 065 } 066 067 }