001/**
002 * Copyright 2011-2013 The Kuali Foundation Licensed under the
003 * Educational Community License, Version 2.0 (the "License"); you may
004 * not use this file except in compliance with the License. You may
005 * obtain a copy of the License at
006 *
007 * http://www.osedu.org/licenses/ECL-2.0
008 *
009 * Unless required by applicable law or agreed to in writing,
010 * software distributed under the License is distributed on an "AS IS"
011 * BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
012 * or implied. See the License for the specific language governing
013 * permissions and limitations under the License.
014 */
015
016package org.kuali.mobility.security.authz.expression;
017
018import org.kuali.mobility.security.user.api.User;
019
020import java.util.ArrayList;
021import java.util.List;
022
023public class NotExpression implements NonLeafExpression {
024
025        private static final long serialVersionUID = -777343514543759642L;
026
027        private List<Expression> children;
028
029        public NotExpression() {
030                children = new ArrayList<Expression>();
031        }
032
033        public boolean evaluate(User user) {
034                for (Expression child : children) {
035                        if (child.evaluate(user)) {
036                                return false;
037                        }
038                }
039                return true;
040        }
041
042        public NonLeafExpression addChild(Expression expression) {
043                children.add(expression);
044                return this;
045        }
046        
047        private Object readResolve() {
048                if (children == null) {
049                        children = new ArrayList<Expression>();
050                }
051                return this;
052        }
053        
054        @Override
055        public boolean equals(Object obj) {
056                if (obj instanceof NotExpression) {
057                        NotExpression other = (NotExpression)obj;
058                        return children.equals(other.children);
059                }
060                return false;
061        }
062
063        @Override
064        public List<Expression> getChildren() {
065                return children;
066        }
067        
068}