Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||
ExceptionUtils |
|
| 4.0;4 |
1 | /* | |
2 | * Licensed to the Apache Software Foundation (ASF) under one | |
3 | * or more contributor license agreements. See the NOTICE file | |
4 | * distributed with this work for additional information | |
5 | * regarding copyright ownership. The ASF licenses this file | |
6 | * to you under the Apache License, Version 2.0 (the | |
7 | * "License"); you may not use this file except in compliance | |
8 | * with the License. You may obtain a copy of the License at | |
9 | * | |
10 | * http://www.apache.org/licenses/LICENSE-2.0 | |
11 | * | |
12 | * Unless required by applicable law or agreed to in writing, | |
13 | * software distributed under the License is distributed on an | |
14 | * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY | |
15 | * KIND, either express or implied. See the License for the | |
16 | * specific language governing permissions and limitations | |
17 | * under the License. | |
18 | */ | |
19 | package org.apache.myfaces.shared_impl.util; | |
20 | ||
21 | import java.lang.reflect.Method; | |
22 | import java.util.ArrayList; | |
23 | import java.util.List; | |
24 | ||
25 | /** | |
26 | * Various helpers to deal with exception | |
27 | * | |
28 | * @author imario@apache.org | |
29 | */ | |
30 | public final class ExceptionUtils | |
31 | { | |
32 | private ExceptionUtils() | |
33 | 0 | { |
34 | 0 | } |
35 | ||
36 | /** | |
37 | * <p> | |
38 | * returns a list of all throwables (including the one you passed in) wrapped by the given throwable. | |
39 | * In contrast to a simple call to <code>getClause()</code> on each throwable it will also check if the throwable class | |
40 | * contain a method <code>getRootCause()</code> (e.g. ServletException or JspException) and call it instead. | |
41 | * </p> | |
42 | * <p> | |
43 | * The first list element will your passed in exception, the last list element is the cause. | |
44 | * </p> | |
45 | */ | |
46 | public static List getExceptions(Throwable cause) | |
47 | { | |
48 | 0 | List exceptions = new ArrayList(10); |
49 | 0 | exceptions.add(cause); |
50 | ||
51 | do | |
52 | { | |
53 | Throwable nextCause; | |
54 | try | |
55 | { | |
56 | 0 | Method rootCause = cause.getClass().getMethod("getRootCause", new Class[]{}); |
57 | 0 | nextCause = (Throwable) rootCause.invoke(cause, new Object[]{}); |
58 | } | |
59 | 0 | catch(Exception e) |
60 | { | |
61 | 0 | nextCause = cause.getCause(); |
62 | 0 | } |
63 | 0 | if (cause == nextCause) |
64 | { | |
65 | 0 | break; |
66 | } | |
67 | ||
68 | 0 | if (nextCause != null) |
69 | { | |
70 | 0 | exceptions.add(nextCause); |
71 | } | |
72 | ||
73 | 0 | cause = nextCause; |
74 | } | |
75 | 0 | while (cause != null); |
76 | ||
77 | 0 | return exceptions; |
78 | } | |
79 | ||
80 | /** | |
81 | * Find a throwable message starting with the last element.<br /> | |
82 | * Returns the first throwable message where <code>throwable.getMessage() != null</code> | |
83 | */ | |
84 | public static String getExceptionMessage(List throwables) | |
85 | { | |
86 | 0 | if (throwables == null) |
87 | { | |
88 | 0 | return null; |
89 | } | |
90 | ||
91 | 0 | for (int i = throwables.size()-1; i>0; i--) |
92 | { | |
93 | 0 | Throwable t = (Throwable) throwables.get(i); |
94 | 0 | if (t.getMessage() != null) |
95 | { | |
96 | 0 | return t.getMessage(); |
97 | } | |
98 | } | |
99 | ||
100 | 0 | return null; |
101 | } | |
102 | } |