/**
    * Copyright 2011-2013 The Kuali Foundation Licensed under the
    * Educational Community License, Version 2.0 (the "License"); you may
    * not use this file except in compliance with the License. You may
    * obtain a copy of the License at
    *
    * http://www.osedu.org/licenses/ECL-2.0
    *
    * Unless required by applicable law or agreed to in writing,
   * software distributed under the License is distributed on an "AS IS"
   * BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
   * or implied. See the License for the specific language governing
   * permissions and limitations under the License.
   */
  
  package org.kuali.mobility.security.authz.expression;
  
  import org.kuali.mobility.security.user.api.User;
  
  /**
   * @author Kuali Mobility Team (mobility.collab@kuali.org)
   */
  public class GroupExpression implements Expression {
  
  	private static final long serialVersionUID = 8899577797440033748L;
  
  	private String key;
  
  	public GroupExpression(String key) {
  		this.key = key;
  	}
  
  	public boolean evaluate(User user) {
  		return (user != null && user.getGroups() != null && user.isMember(key.toUpperCase()));
  	}
  
  	public String getKey() {
  		return key;
  	}
  
  	@Override
  	public boolean equals(Object obj) {
  		if (obj instanceof GroupExpression) {
  			GroupExpression other = (GroupExpression)obj;
  			return key.equals(other.key);
  		}
  		return false;
  	}
  	
  }