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    /**
026     * Negates objects which are equal to the object passed to the constructor.
027     * @author Pavel Vlasov
028     * @revision $Revision$
029     */
030    public class EqualityNegator implements Negator {
031    
032            private String msg;
033            private Object obj;
034    
035            /**
036             * @param obj Object to be negated.
037             */
038            public EqualityNegator(Object obj) {
039                    super();
040                    this.obj=obj;
041            }
042            
043            /**
044             * @param obj Object to be negated.
045             * @param msg Message why the object was negated.
046             */
047            public EqualityNegator(Object obj, String msg) {
048                    this(obj);
049                    this.msg=msg;
050            }
051    
052            public boolean negates(Object obj) {
053                    return this.obj.equals(obj);
054            }
055    
056            /**
057             * @return Message why object was negated.
058             */
059            public String getMessage() {
060                    return msg;
061            }
062    }