1 | /* |
2 | Copyright (C) 2004 MySQL AB |
3 | |
4 | This program is free software; you can redistribute it and/or modify |
5 | it under the terms of the GNU General Public License version 2 as |
6 | published by the Free Software Foundation. |
7 | |
8 | This program is distributed in the hope that it will be useful, |
9 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
10 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
11 | GNU General Public License for more details. |
12 | |
13 | You should have received a copy of the GNU General Public License |
14 | along with this program; if not, write to the Free Software |
15 | Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
16 | |
17 | */ |
18 | package com.mysql.management.util; |
19 | |
20 | import java.io.PrintStream; |
21 | import java.sql.SQLException; |
22 | |
23 | /** |
24 | * @author Eric Herman <eric@mysql.com> |
25 | * @version $Id: Exceptions.java,v 1.9 2005/10/25 19:11:16 eherman Exp $ |
26 | */ |
27 | public class Exceptions { |
28 | private PrintStream log; |
29 | |
30 | public Exceptions() { |
31 | this(null); |
32 | } |
33 | |
34 | public Exceptions(PrintStream log) { |
35 | this.log = log; |
36 | } |
37 | |
38 | /** |
39 | * Convienence funciton to convert checked exceptions to RuntimeException |
40 | * |
41 | * @param e |
42 | * java.lang.Exception |
43 | * @return a RuntimeException if e is already a Runtime Exception, e is |
44 | * simply returned otherwise e is wrapped by a RuntimeException: new |
45 | * WrappedException(e) |
46 | * |
47 | * This is final simply as a hint to the compiler, it may be un-finalized |
48 | * safely. |
49 | */ |
50 | public final RuntimeException toRuntime(Exception e) { |
51 | if (e instanceof RuntimeException) { |
52 | return (RuntimeException) e; |
53 | } |
54 | return new WrappedException(e); |
55 | } |
56 | |
57 | /** |
58 | * This is final simply as a hint to the compiler, it may be un-finalized |
59 | * safely. |
60 | */ |
61 | public final SQLException toSQLException(Exception e) { |
62 | if (e instanceof SQLException) { |
63 | return (SQLException) e; |
64 | } |
65 | return new CausedSQLException(e); |
66 | } |
67 | |
68 | /** |
69 | * This is final simply as a hint to the compiler, it may be un-finalized |
70 | * safely. |
71 | */ |
72 | protected final void log(Exception e) { |
73 | if (log != null) { |
74 | e.printStackTrace(log); |
75 | } |
76 | } |
77 | |
78 | // ------------------------------------ |
79 | |
80 | public static abstract class Block extends Exceptions { |
81 | abstract protected Object inner() throws Exception; |
82 | |
83 | public Object exec() { |
84 | try { |
85 | return inner(); |
86 | } catch (Exception e) { |
87 | log(e); |
88 | throw toRuntime(e); |
89 | } |
90 | } |
91 | } |
92 | |
93 | public static abstract class StringBlock extends Exceptions { |
94 | abstract protected String inner() throws Exception; |
95 | |
96 | public String exec() { |
97 | try { |
98 | return inner(); |
99 | } catch (Exception e) { |
100 | log(e); |
101 | throw toRuntime(e); |
102 | } |
103 | } |
104 | } |
105 | |
106 | public static abstract class SQLBlock extends Exceptions { |
107 | public SQLBlock(PrintStream log) { |
108 | super(log); |
109 | } |
110 | |
111 | abstract protected Object inner() throws Exception; |
112 | |
113 | public Object exec() throws SQLException { |
114 | try { |
115 | return inner(); |
116 | } catch (Exception e) { |
117 | log(e); |
118 | throw toSQLException(e); |
119 | } |
120 | } |
121 | } |
122 | |
123 | public static abstract class VoidBlock extends Exceptions { |
124 | abstract protected void inner() throws Exception; |
125 | |
126 | public void exec() { |
127 | try { |
128 | inner(); |
129 | } catch (Exception e) { |
130 | log(e); |
131 | throw toRuntime(e); |
132 | } |
133 | } |
134 | |
135 | public void execNotThrowingExceptions(PrintStream err) { |
136 | try { |
137 | inner(); |
138 | } catch (Exception e) { |
139 | e.printStackTrace(err); |
140 | } |
141 | } |
142 | } |
143 | } |