01: /*
02: * Copyright 2005-2006 The Kuali Foundation.
03: *
04: * Licensed under the Educational Community License, Version 1.0 (the "License");
05: * you may not use this file except in compliance with the License.
06: * You may obtain a copy of the License at
07: *
08: * http://www.opensource.org/licenses/ecl1.php
09: *
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.core.bo.user;
17:
18: /**
19: * UserId is an id type for all of the users
20: *
21: *
22: */
23: public interface UserId {
24: /**
25: * Returns true if this userId has an empty value. Empty userIds can't be used as keys in a Hash, among other things.
26: *
27: * @return true if this instance doesn't have a value
28: */
29: public boolean isEmpty();
30: }
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