1 /*
2 * $Source$
3 * $Revision$
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 after
73 * being called a number of times.
74 * @param i Interface class object
75 * @param methodName name in class.methodName format
76 * @param goes number of time method can be called before throwing
77 */
78 public static void startThrowingAfter(Class<?> i, String methodName, int goes) {
79 String fullName = i.getName() + "." + methodName;
80 throwers.put(fullName, new Integer(1 + goes));
81 }
82 /**
83 * Tell named method to stop throwing exceptions.
84 * @param i Interface class object
85 * @param methodName name in class.methodName format
86 */
87 public static void stopThrowing(Class<?> i, String methodName) {
88 String fullName = i.getName() + "." + methodName;
89 throwers.put(fullName, new Integer(0));
90 }
91 /**
92 * Check whether method should throw, called once for every method invocation.
93 * @param i Interface class object
94 * @param methodName name in class.methodName format
95 * @return whether method named should throw exception
96 */
97 public static boolean shouldThrow(Class<?> i, String methodName) {
98 String fullName = i.getName() + "." + methodName;
99 if (throwers.get(fullName) == null)
100 throwers.put(fullName, new Integer(0));
101 int toGo = ((Integer)throwers.get(fullName)).intValue();
102 if (toGo == 0)
103 return false;
104 else {
105 toGo = toGo - 1;
106 throwers.put(fullName, new Integer(toGo));
107 return toGo == 0 ? true : false;
108 }
109 }
110
111 }