001 /* 002 * Copyright 2001,2004 The Apache Software Foundation. 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * http://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 * See the License for the specific language governing permissions and 014 * limitations under the License. 015 */ 016 017 package org.apache.commons.scaffold.lang; 018 019 import org.apache.commons.scaffold.text.ConvertUtils; 020 021 022 /** 023 * Mimicks new functionality in 1.4 024 * http://www.javaworld.com/javaworld/jw-08-2001/jw-0803-exceptions.html 025 * @author Brian Geotz 026 * @version $Revision: 155464 $ $Date: 2005-02-26 13:26:54 +0000 (Sat, 26 Feb 2005) $ 027 */ 028 public class ChainedException extends Exception { 029 030 private static final String CAUSED_BY = "Caused by: "; 031 032 private Throwable cause; 033 034 public ChainedException() { 035 super(); 036 } 037 038 public ChainedException(String message) { 039 super(message); 040 } 041 042 public ChainedException(String message, Throwable cause) { 043 super(message); 044 this.cause = cause; 045 } 046 047 public ChainedException(Throwable cause) { 048 super(); 049 this.cause = cause; 050 } 051 052 public Throwable getCause() { 053 return this.cause; 054 } 055 056 public boolean isCause() { 057 return (this.cause!=null); 058 } 059 060 public String getCauseMessage() { 061 if (this.cause==null) 062 return null; 063 return this.cause.getMessage(); 064 } 065 066 public void getMessage(StringBuffer sb) { 067 sb.append(super.getMessage()); 068 sb.append(ConvertUtils.LINE_FEED); 069 if (cause != null) { 070 sb.append(CAUSED_BY); 071 if (cause instanceof ChainedException) { 072 ChainedException chainedCause = (ChainedException) cause; 073 chainedCause.getMessage(sb); 074 } 075 else { 076 sb.append(cause.getMessage()); 077 } 078 } 079 } 080 081 public void printStackTrace() { 082 super.printStackTrace(); 083 if (cause != null) { 084 System.err.println(CAUSED_BY); 085 cause.printStackTrace(); 086 } 087 } 088 089 public void printStackTrace(java.io.PrintStream ps) { 090 super.printStackTrace(ps); 091 if (cause != null) { 092 ps.println(CAUSED_BY); 093 cause.printStackTrace(ps); 094 } 095 } 096 097 public void printStackTrace(java.io.PrintWriter pw) { 098 super.printStackTrace(pw); 099 if (cause != null) { 100 pw.println(CAUSED_BY); 101 cause.printStackTrace(pw); 102 } 103 } 104 } 105