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.Child; 027 import biz.hammurapi.rules.tutorial.conclusions.Daughter; 028 import biz.hammurapi.rules.tutorial.conclusions.Father; 029 import biz.hammurapi.rules.tutorial.conclusions.GrandDaughter; 030 import biz.hammurapi.rules.tutorial.conclusions.GrandFather; 031 import biz.hammurapi.rules.tutorial.conclusions.GrandMother; 032 import biz.hammurapi.rules.tutorial.conclusions.GrandSon; 033 import biz.hammurapi.rules.tutorial.conclusions.Mother; 034 import biz.hammurapi.rules.tutorial.conclusions.Parent; 035 import biz.hammurapi.rules.tutorial.conclusions.Son; 036 037 public class GrandRules extends Rule { 038 039 /** 040 * Son of child is a grandson. 041 * @param son 042 * @param parent 043 * @return 044 */ 045 public GrandSon infer(Son son, Parent parent) { 046 return son.getObject().equals(parent.getObject()) ? new GrandSon(son.getSubject(), parent.getSubject()) : null; 047 } 048 049 /** 050 * Daughter of child is a granddaughter. 051 * @param daughter 052 * @param parent 053 * @return 054 */ 055 public GrandDaughter infer(Daughter daughter, Parent parent) { 056 return daughter.getObject().equals(parent.getObject()) 057 ? new GrandDaughter(daughter.getSubject(), parent.getSubject()) 058 : null; 059 } 060 061 /** 062 * Father of parent is grandparent. 063 * @param child 064 * @param father 065 * @return 066 */ 067 public GrandFather infer(Child child, Father father) { 068 return child.getObject().equals(father.getObject()) ? new GrandFather(father.getSubject(), child.getSubject()) : null; 069 } 070 071 /** 072 * Mother of parent is grandmother. 073 * @param child 074 * @param mother 075 * @return 076 */ 077 public GrandMother infer(Child child, Mother mother) { 078 GrandMother grandMother = child.getObject().equals(mother.getObject()) ? new GrandMother(mother.getSubject(), child.getSubject()) : null; 079 return grandMother; 080 } 081 082 }