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.rules;
024    
025    import javax.rules.Handle;
026    
027    /**
028     * Negates object whose handles are equal to handle of the object passed to the constructor.
029     * @author Pavel Vlasov
030     * @revision $Revision$
031     */
032    public class ObjectNegator implements Negator {
033            private Handle handle;
034            private HandleManager handleManager;
035            private String message;
036            
037            /**
038             * @param manager Handle manager.
039             * @param obj Object to be negated.
040             * @param message Informational message.
041             */
042            public ObjectNegator(HandleManager manager, Object obj, String message) {
043                    super();
044                    handleManager = manager;
045                    this.handle = manager.addObject(obj);
046                    this.message=message;
047            }
048    
049            public boolean negates(Object obj) {    
050                    return handle.equals(handleManager.addObject(obj));
051            }
052    
053            public String getMessage() {
054                    return message;
055            }
056            
057            public String toString() {
058                    return message;
059            }
060    }