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org.apache.commons.mail.EmailException |
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1 | /* |
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2 | * Copyright 2001-2005 The Apache Software Foundation |
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3 | * |
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4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
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5 | * you may not use this file except in compliance with the License. |
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6 | * You may obtain a copy of the License at |
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7 | * |
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8 | * http://www.apache.org/licenses/LICENSE-2.0 |
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9 | * |
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10 | * Unless required by applicable law or agreed to in writing, software |
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11 | * distributed under the License is distributed on an "AS IS" BASIS, |
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12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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13 | * See the License for the specific language governing permissions and |
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14 | * limitations under the License. |
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15 | */ |
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16 | ||
17 | package org.apache.commons.mail; |
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18 | ||
19 | import java.io.PrintStream; |
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20 | import java.io.PrintWriter; |
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21 | ||
22 | /** |
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23 | * Exception thrown when a checked error occurs in commons-email. |
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24 | * <p> |
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25 | * Supports nesting, emulating JDK 1.4 behavior if necessary. |
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26 | * <p> |
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27 | * Adapted from {@link org.apache.commons.collections.FunctorException}. |
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28 | * |
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29 | * @author jakarta-commons |
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30 | * @since 1.0 |
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31 | * @version $Id: EmailException.java 279313 2005-09-07 12:41:58Z henning $ |
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32 | */ |
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33 | public class EmailException |
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34 | extends Exception |
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35 | { |
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36 | /** Serializable version identifier */ |
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37 | static final long serialVersionUID = 5550674499282474616L; |
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38 | ||
39 | /** |
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40 | * Does JDK support nested exceptions? |
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41 | */ |
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42 | private static final boolean JDK_SUPPORTS_NESTED; |
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43 | ||
44 | static |
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45 | { |
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46 | 0 | boolean flag = false; |
47 | ||
48 | try |
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49 | { |
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50 | 0 | Throwable.class.getDeclaredMethod("getCause", new Class[0]); |
51 | 0 | flag = true; |
52 | } |
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53 | 0 | catch (NoSuchMethodException ex) |
54 | { |
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55 | 0 | flag = false; |
56 | 0 | } |
57 | ||
58 | 0 | JDK_SUPPORTS_NESTED = flag; |
59 | 0 | } |
60 | ||
61 | /** |
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62 | * Root cause of the exception |
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63 | */ |
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64 | private final Throwable rootCause; |
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65 | ||
66 | /** |
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67 | * Constructs a new <code>EmailException</code> with no |
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68 | * detail message. |
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69 | */ |
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70 | public EmailException() |
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71 | { |
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72 | 0 | super(); |
73 | 0 | this.rootCause = null; |
74 | 0 | } |
75 | ||
76 | /** |
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77 | * Constructs a new <code>EmailException</code> with specified |
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78 | * detail message. |
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79 | * |
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80 | * @param msg the error message. |
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81 | */ |
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82 | public EmailException(String msg) |
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83 | { |
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84 | 0 | super(msg); |
85 | 0 | this.rootCause = null; |
86 | 0 | } |
87 | ||
88 | /** |
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89 | * Constructs a new <code>EmailException</code> with specified |
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90 | * nested <code>Throwable</code> root cause. |
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91 | * |
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92 | * @param rootCause the exception or error that caused this exception |
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93 | * to be thrown. |
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94 | */ |
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95 | public EmailException(Throwable rootCause) |
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96 | { |
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97 | 0 | super(((rootCause == null) ? class="keyword">null : rootCause.getMessage())); |
98 | 0 | this.rootCause = rootCause; |
99 | 0 | } |
100 | ||
101 | /** |
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102 | * Constructs a new <code>EmailException</code> with specified |
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103 | * detail message and nested <code>Throwable</code> root cause. |
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104 | * |
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105 | * @param msg the error message. |
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106 | * @param rootCause the exception or error that caused this exception |
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107 | * to be thrown. |
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108 | */ |
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109 | public EmailException(String msg, Throwable rootCause) |
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110 | { |
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111 | 0 | super(msg); |
112 | 0 | this.rootCause = rootCause; |
113 | 0 | } |
114 | ||
115 | /** |
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116 | * Gets the cause of this throwable. |
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117 | * |
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118 | * @return the cause of this throwable, or <code>null</code> |
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119 | */ |
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120 | public Throwable getCause() |
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121 | { |
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122 | 0 | return rootCause; |
123 | } |
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124 | ||
125 | /** |
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126 | * Prints the stack trace of this exception to the standard error stream. |
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127 | */ |
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128 | public void printStackTrace() |
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129 | { |
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130 | 0 | printStackTrace(System.err); |
131 | 0 | } |
132 | ||
133 | /** |
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134 | * Prints the stack trace of this exception to the specified stream. |
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135 | * |
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136 | * @param out the <code>PrintStream</code> to use for output |
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137 | */ |
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138 | public void printStackTrace(PrintStream out) |
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139 | { |
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140 | 0 | synchronized (out) |
141 | { |
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142 | 0 | PrintWriter pw = new PrintWriter(out, false); |
143 | 0 | printStackTrace(pw); |
144 | ||
145 | // Flush the PrintWriter before it's GC'ed. |
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146 | 0 | pw.flush(); |
147 | 0 | } |
148 | 0 | } |
149 | ||
150 | /** |
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151 | * Prints the stack trace of this exception to the specified writer. |
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152 | * |
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153 | * @param out the <code>PrintWriter</code> to use for output |
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154 | */ |
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155 | public void printStackTrace(PrintWriter out) |
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156 | { |
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157 | 0 | synchronized (out) |
158 | { |
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159 | 0 | super.printStackTrace(out); |
160 | ||
161 | 0 | if ((rootCause != null) && (JDK_SUPPORTS_NESTED == false)) |
162 | { |
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163 | 0 | out.print("Caused by: "); |
164 | 0 | rootCause.printStackTrace(out); |
165 | } |
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166 | 0 | } |
167 | 0 | } |
168 | } |
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