Jake Slack | 03928ae | 2014-05-13 18:41:56 -0700 | [diff] [blame] | 1 | // |
| 2 | // ======================================================================== |
| 3 | // Copyright (c) 1995-2014 Mort Bay Consulting Pty. Ltd. |
| 4 | // ------------------------------------------------------------------------ |
| 5 | // All rights reserved. This program and the accompanying materials |
| 6 | // are made available under the terms of the Eclipse Public License v1.0 |
| 7 | // and Apache License v2.0 which accompanies this distribution. |
| 8 | // |
| 9 | // The Eclipse Public License is available at |
| 10 | // http://www.eclipse.org/legal/epl-v10.html |
| 11 | // |
| 12 | // The Apache License v2.0 is available at |
| 13 | // http://www.opensource.org/licenses/apache2.0.php |
| 14 | // |
| 15 | // You may elect to redistribute this code under either of these licenses. |
| 16 | // ======================================================================== |
| 17 | // |
| 18 | |
| 19 | package org.eclipse.jetty.util; |
| 20 | import java.io.PrintStream; |
| 21 | import java.io.PrintWriter; |
| 22 | import java.util.List; |
| 23 | |
| 24 | |
| 25 | /* ------------------------------------------------------------ */ |
| 26 | /** Wraps multiple exceptions. |
| 27 | * |
| 28 | * Allows multiple exceptions to be thrown as a single exception. |
| 29 | * |
| 30 | * |
| 31 | */ |
| 32 | @SuppressWarnings("serial") |
| 33 | public class MultiException extends Exception |
| 34 | { |
| 35 | private Object nested; |
| 36 | |
| 37 | /* ------------------------------------------------------------ */ |
| 38 | public MultiException() |
| 39 | { |
| 40 | super("Multiple exceptions"); |
| 41 | } |
| 42 | |
| 43 | /* ------------------------------------------------------------ */ |
| 44 | public void add(Throwable e) |
| 45 | { |
| 46 | if (e instanceof MultiException) |
| 47 | { |
| 48 | MultiException me = (MultiException)e; |
| 49 | for (int i=0;i<LazyList.size(me.nested);i++) |
| 50 | nested=LazyList.add(nested,LazyList.get(me.nested,i)); |
| 51 | } |
| 52 | else |
| 53 | nested=LazyList.add(nested,e); |
| 54 | } |
| 55 | |
| 56 | /* ------------------------------------------------------------ */ |
| 57 | public int size() |
| 58 | { |
| 59 | return LazyList.size(nested); |
| 60 | } |
| 61 | |
| 62 | /* ------------------------------------------------------------ */ |
| 63 | public List<Throwable> getThrowables() |
| 64 | { |
| 65 | return LazyList.getList(nested); |
| 66 | } |
| 67 | |
| 68 | /* ------------------------------------------------------------ */ |
| 69 | public Throwable getThrowable(int i) |
| 70 | { |
| 71 | return (Throwable) LazyList.get(nested,i); |
| 72 | } |
| 73 | |
| 74 | /* ------------------------------------------------------------ */ |
| 75 | /** Throw a multiexception. |
| 76 | * If this multi exception is empty then no action is taken. If it |
| 77 | * contains a single exception that is thrown, otherwise the this |
| 78 | * multi exception is thrown. |
| 79 | * @exception Exception |
| 80 | */ |
| 81 | public void ifExceptionThrow() |
| 82 | throws Exception |
| 83 | { |
| 84 | switch (LazyList.size(nested)) |
| 85 | { |
| 86 | case 0: |
| 87 | break; |
| 88 | case 1: |
| 89 | Throwable th=(Throwable)LazyList.get(nested,0); |
| 90 | if (th instanceof Error) |
| 91 | throw (Error)th; |
| 92 | if (th instanceof Exception) |
| 93 | throw (Exception)th; |
| 94 | default: |
| 95 | throw this; |
| 96 | } |
| 97 | } |
| 98 | |
| 99 | /* ------------------------------------------------------------ */ |
| 100 | /** Throw a Runtime exception. |
| 101 | * If this multi exception is empty then no action is taken. If it |
| 102 | * contains a single error or runtime exception that is thrown, otherwise the this |
| 103 | * multi exception is thrown, wrapped in a runtime exception. |
| 104 | * @exception Error If this exception contains exactly 1 {@link Error} |
| 105 | * @exception RuntimeException If this exception contains 1 {@link Throwable} but it is not an error, |
| 106 | * or it contains more than 1 {@link Throwable} of any type. |
| 107 | */ |
| 108 | public void ifExceptionThrowRuntime() |
| 109 | throws Error |
| 110 | { |
| 111 | switch (LazyList.size(nested)) |
| 112 | { |
| 113 | case 0: |
| 114 | break; |
| 115 | case 1: |
| 116 | Throwable th=(Throwable)LazyList.get(nested,0); |
| 117 | if (th instanceof Error) |
| 118 | throw (Error)th; |
| 119 | else if (th instanceof RuntimeException) |
| 120 | throw (RuntimeException)th; |
| 121 | else |
| 122 | throw new RuntimeException(th); |
| 123 | default: |
| 124 | throw new RuntimeException(this); |
| 125 | } |
| 126 | } |
| 127 | |
| 128 | /* ------------------------------------------------------------ */ |
| 129 | /** Throw a multiexception. |
| 130 | * If this multi exception is empty then no action is taken. If it |
| 131 | * contains a any exceptions then this |
| 132 | * multi exception is thrown. |
| 133 | */ |
| 134 | public void ifExceptionThrowMulti() |
| 135 | throws MultiException |
| 136 | { |
| 137 | if (LazyList.size(nested)>0) |
| 138 | throw this; |
| 139 | } |
| 140 | |
| 141 | /* ------------------------------------------------------------ */ |
| 142 | @Override |
| 143 | public String toString() |
| 144 | { |
| 145 | if (LazyList.size(nested)>0) |
| 146 | return MultiException.class.getSimpleName()+ |
| 147 | LazyList.getList(nested); |
| 148 | return MultiException.class.getSimpleName()+"[]"; |
| 149 | } |
| 150 | |
| 151 | /* ------------------------------------------------------------ */ |
| 152 | @Override |
| 153 | public void printStackTrace() |
| 154 | { |
| 155 | super.printStackTrace(); |
| 156 | for (int i=0;i<LazyList.size(nested);i++) |
| 157 | ((Throwable)LazyList.get(nested,i)).printStackTrace(); |
| 158 | } |
| 159 | |
| 160 | |
| 161 | /* ------------------------------------------------------------------------------- */ |
| 162 | /** |
| 163 | * @see java.lang.Throwable#printStackTrace(java.io.PrintStream) |
| 164 | */ |
| 165 | @Override |
| 166 | public void printStackTrace(PrintStream out) |
| 167 | { |
| 168 | super.printStackTrace(out); |
| 169 | for (int i=0;i<LazyList.size(nested);i++) |
| 170 | ((Throwable)LazyList.get(nested,i)).printStackTrace(out); |
| 171 | } |
| 172 | |
| 173 | /* ------------------------------------------------------------------------------- */ |
| 174 | /** |
| 175 | * @see java.lang.Throwable#printStackTrace(java.io.PrintWriter) |
| 176 | */ |
| 177 | @Override |
| 178 | public void printStackTrace(PrintWriter out) |
| 179 | { |
| 180 | super.printStackTrace(out); |
| 181 | for (int i=0;i<LazyList.size(nested);i++) |
| 182 | ((Throwable)LazyList.get(nested,i)).printStackTrace(out); |
| 183 | } |
| 184 | |
| 185 | } |