001 /* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017 package org.apache.commons.betwixt.io; 018 019 /** 020 * <p>Thrown when bean evaluation finds a cycle reference.</p> 021 * 022 * <p>There are two possible behaviours that <code>Betwixt</code> adopts when 023 * a cycle in the object graph is encountered. 024 * 025 * <p>If <code>ID</code> attributes are being generated, 026 * then the recursion will stop and the <code>IDREF</code> attribute will be 027 * written. 028 * In this case, <em>no exception will be thrown</em>.</p> 029 * 030 * <p>If <code>ID</code> are <strong>not</strong> being generated, 031 * then this exception will be thrown.</p> 032 * 033 * @author <a href="mailto:rdonkin@apache.org">Robert Burrell Donkin</a> 034 * @version $Revision: 438373 $ 035 */ 036 public class CyclicReferenceException extends RuntimeException { 037 038 /** Message used with empty constructor */ 039 private static final String DEFAULT_MESSAGE 040 = "Bean graph contains a cyclic reference"; 041 042 /** Construct exception with default message. 043 */ 044 public CyclicReferenceException() { 045 super(DEFAULT_MESSAGE); 046 } 047 048 /** 049 * Construct exception with message 050 * 051 * @param message the detailed message string 052 */ 053 public CyclicReferenceException(String message) { 054 super(message); 055 } 056 }