001 /* 002 * hammurapi-rules-tutorial @mesopotamia.version@ 003 * Hammurapi rules tutorial. 004 * Copyright (C) 2006 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.rules.tutorial.rules; 024 025 import biz.hammurapi.rules.Rule; 026 import biz.hammurapi.rules.tutorial.conclusions.Husband; 027 import biz.hammurapi.rules.tutorial.conclusions.Spouse; 028 import biz.hammurapi.rules.tutorial.conclusions.Wife; 029 030 public class SpouseRules extends Rule { 031 032 public SpouseRules() { 033 setMethodFactTypes(Spouse.class , new Class[] {Husband.class, Wife.class}); 034 } 035 036 /** 037 * Male spouse is husband, female spouse is wife. 038 * If A is a spouse of B then B is a spouse of A. 039 * @param spouse 040 * @return Brother or Sister. 041 */ 042 public Spouse infer(Spouse spouse) { 043 post(new Spouse(spouse.getObject(), spouse.getSubject())); 044 045 if (spouse.getSubject().isMale()) { 046 if (!(spouse instanceof Husband)) { 047 return new Husband(spouse.getSubject(), spouse.getObject()); 048 } 049 } else { 050 if (!(spouse instanceof Wife)) { 051 return new Wife(spouse.getSubject(), spouse.getObject()); 052 } 053 } 054 return null; 055 } 056 }