1 /**
2 * Copyright 2005-2012 The Kuali Foundation
3 *
4 * Licensed under the Educational Community License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.opensource.org/licenses/ecl2.php
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16 package org.kuali.rice.kew.api.identity;
17
18 import java.io.Serializable;
19
20 /**
21 * Superinterface of UserId and GroupId
22 * @author Kuali Rice Team (rice.collab@kuali.org)
23 */
24 public interface Id extends Serializable {
25 /**
26 * Returns true if this Id has an empty value. Empty Ids can't be used as keys in a Hash,
27 * among other things.
28 *
29 * @return true if this instance doesn't have a value
30 */
31 public boolean isEmpty();
32 }