1 /*
2 * $Source: /usr/cvsroot/melati/throwing-jdbc/src/main/java/org/melati/poem/dbms/test/sql/Thrower.java,v $
3 * $Revision: 1.11 $
4 *
5 * Copyright (C) 2007 Tim Pizey
6 *
7 * Part of Melati (http://melati.org), a framework for the rapid
8 * development of clean, maintainable web applications.
9 *
10 * Melati is free software; Permission is granted to copy, distribute
11 * and/or modify this software under the terms either:
12 *
13 * a) the GNU General Public License as published by the Free Software
14 * Foundation; either version 2 of the License, or (at your option)
15 * any later version,
16 *
17 * or
18 *
19 * b) any version of the Melati Software License, as published
20 * at http://melati.org
21 *
22 * You should have received a copy of the GNU General Public License and
23 * the Melati Software License along with this program;
24 * if not, write to the Free Software Foundation, Inc.,
25 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA to obtain the
26 * GNU General Public License and visit http://melati.org to obtain the
27 * Melati Software License.
28 *
29 * Feel free to contact the Developers of Melati (http://melati.org),
30 * if you would like to work out a different arrangement than the options
31 * outlined here. It is our intention to allow Melati to be used by as
32 * wide an audience as possible.
33 *
34 * This program is distributed in the hope that it will be useful,
35 * but WITHOUT ANY WARRANTY; without even the implied warranty of
36 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
37 * GNU General Public License for more details.
38 *
39 * Contact details for copyright holder:
40 *
41 * Tim Pizey <timp At paneris.org>
42 * http://paneris.org/~timp
43 */
44 package org.melati.poem.dbms.test.sql;
45
46 import java.util.Hashtable;
47
48
49 /**
50 * A class which can throw on demand.
51 *
52 * @author timp
53 * @since 10 Feb 2007
54 *
55 */
56 public abstract class Thrower {
57
58 static Hashtable<String,Integer> throwers = new Hashtable<String, Integer>();
59
60 protected Thrower() {}
61
62 /**
63 * Tell named method to start throwing exceptions.
64 * @param i Interface class object
65 * @param methodName name in class.methodName format
66 */
67 public static void startThrowing(Class<?> i, String methodName) {
68 String fullName = i.getName() + "." + methodName;
69 throwers.put(fullName, new Integer(1));
70 }
71 /**
72 * Tell named method to start throwing exceptions.
73 * @param i Interface class object
74 * @param methodName name in class.methodName format
75 */
76 public static void startThrowingAfter(Class<?> i, String methodName, int goes) {
77 String fullName = i.getName() + "." + methodName;
78 throwers.put(fullName, new Integer(1 + goes));
79 }
80 /**
81 * Tell named method to stop throwing exceptions.
82 * @param i Interface class object
83 * @param methodName name in class.methodName format
84 */
85 public static void stopThrowing(Class<?> i, String methodName) {
86 String fullName = i.getName() + "." + methodName;
87 throwers.put(fullName, new Integer(0));
88 }
89 /**
90 * Check whether method should throw, called once for every method invocation.
91 * @param i Interface class object
92 * @param methodName name in class.methodName format
93 * @return whether method named should throw exception
94 */
95 public static boolean shouldThrow(Class<?> i, String methodName) {
96 String fullName = i.getName() + "." + methodName;
97 if (throwers.get(fullName) == null)
98 throwers.put(fullName, new Integer(0));
99 int toGo = ((Integer)throwers.get(fullName)).intValue();
100 if (toGo == 0)
101 return false;
102 else {
103 toGo = toGo - 1;
104 throwers.put(fullName, new Integer(toGo));
105 return toGo == 0 ? true : false;
106 }
107 }
108
109 }