01: /*
02: * Licensed to the Apache Software Foundation (ASF) under one or more
03: * contributor license agreements. See the NOTICE file distributed with
04: * this work for additional information regarding copyright ownership.
05: * The ASF licenses this file to You under the Apache License, Version 2.0
06: * (the "License"); you may not use this file except in compliance with
07: * the License. You may obtain a copy of the License at
08: *
09: * http://www.apache.org/licenses/LICENSE-2.0
10: *
11: * Unless required by applicable law or agreed to in writing, software
12: * distributed under the License is distributed on an "AS IS" BASIS,
13: * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14: * See the License for the specific language governing permissions and
15: * limitations under the License.
16: */
17: package org.apache.commons.betwixt.io;
18:
19: /**
20: * <p>Thrown when bean evaluation finds a cycle reference.</p>
21: *
22: * <p>There are two possible behaviours that <code>Betwixt</code> adopts when
23: * a cycle in the object graph is encountered.
24: *
25: * <p>If <code>ID</code> attributes are being generated,
26: * then the recursion will stop and the <code>IDREF</code> attribute will be
27: * written.
28: * In this case, <em>no exception will be thrown</em>.</p>
29: *
30: * <p>If <code>ID</code> are <strong>not</strong> being generated,
31: * then this exception will be thrown.</p>
32: *
33: * @author <a href="mailto:rdonkin@apache.org">Robert Burrell Donkin</a>
34: * @version $Revision: 438373 $
35: */
36: public class CyclicReferenceException extends RuntimeException {
37:
38: /** Message used with empty constructor */
39: private static final String DEFAULT_MESSAGE = "Bean graph contains a cyclic reference";
40:
41: /** Construct exception with default message.
42: */
43: public CyclicReferenceException() {
44: super (DEFAULT_MESSAGE);
45: }
46:
47: /**
48: * Construct exception with message
49: *
50: * @param message the detailed message string
51: */
52: public CyclicReferenceException(String message) {
53: super(message);
54: }
55: }
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