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.conclusions;
024    
025    import biz.hammurapi.rules.Negator;
026    import biz.hammurapi.rules.Supercedable;
027    
028    /**
029     * Negates bad facts. Uses equals() to compare facts.
030     * @author Pavel Vlasov
031     * @revision $Revision$
032     */
033    public class SuspectParentRelationship implements Negator, Supercedable {
034            String message;
035            private Parent parent;
036    
037            public SuspectParentRelationship(Parent parent, String message) {
038                    this.message=message;
039                    this.parent=parent;
040            }
041    
042            public boolean negates(Object obj) {
043                    // Negate parent itself
044                    if (obj instanceof Parent) {
045                            return parent.getSubject().equals(((Parent) obj).getSubject()) && parent.getObject().equals(((Parent) obj).getObject());
046                    }
047                    
048                    
049                    
050                    // Negate child
051                    if (obj instanceof Child) {
052                            return ((Child) obj).getSubject().equals(parent.getObject()) && ((Child) obj).getObject().equals(parent.getSubject());
053                    }
054                    
055                    return false;
056            }
057            
058            public String toString() {
059                    return "[Suspect parent relationship] "+message+": "+parent;
060            }
061    
062            public boolean supercedes(Object obj) {
063                    return obj instanceof SuspectParentRelationship && parent.supercedes(((SuspectParentRelationship) obj).parent);
064            }
065            
066    }