1 | /* This file is part of the project "Hilbert II" - http://www.qedeq.org |
2 | * |
3 | * Copyright 2000-2014, Michael Meyling <mime@qedeq.org>. |
4 | * |
5 | * "Hilbert II" is free software; you can redistribute |
6 | * it and/or modify it under the terms of the GNU General Public |
7 | * License as published by the Free Software Foundation; either |
8 | * version 2 of the License, or (at your option) any later version. |
9 | * |
10 | * This program is distributed in the hope that it will be useful, |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
13 | * GNU General Public License for more details. |
14 | */ |
15 | |
16 | package org.qedeq.kernel.bo.log; |
17 | |
18 | import java.io.PrintStream; |
19 | import java.util.ArrayList; |
20 | import java.util.List; |
21 | |
22 | import org.qedeq.base.trace.Trace; |
23 | import org.qedeq.kernel.bo.common.QedeqBo; |
24 | |
25 | |
26 | /** |
27 | * This class organizes the logging of module events. |
28 | * |
29 | * TODO mime 20080317: must this be a singleton? |
30 | * |
31 | * @author Michael Meyling |
32 | */ |
33 | public final class ModuleEventLog implements ModuleEventListener { |
34 | |
35 | /** This class. */ |
36 | private static final Class CLASS = ModuleEventLog.class; |
37 | |
38 | /** The one and only instance. */ |
39 | private static ModuleEventLog instance = new ModuleEventLog(); |
40 | |
41 | /** The loggers. */ |
42 | private List loggers = new ArrayList(); |
43 | |
44 | |
45 | /** |
46 | * Get instance of Logger. |
47 | * |
48 | * @return singleton |
49 | */ |
50 | public static final ModuleEventLog getInstance() { |
51 | return instance; |
52 | } |
53 | |
54 | /** |
55 | * Don't use me outside of this class. |
56 | */ |
57 | private ModuleEventLog() { |
58 | // nothing to do |
59 | } |
60 | |
61 | /** |
62 | * Add listener. |
63 | * |
64 | * @param log Add this listener. |
65 | */ |
66 | public final void addLog(final ModuleEventListener log) { |
67 | loggers.add(log); |
68 | } |
69 | |
70 | /** |
71 | * Remove listener. |
72 | * |
73 | * @param log Remove this listener. |
74 | */ |
75 | public final void removeLog(final ModuleEventListener log) { |
76 | loggers.remove(log); |
77 | } |
78 | |
79 | /** |
80 | * Add stream listener. |
81 | * |
82 | * @param out Put messages into this stream. |
83 | */ |
84 | public final void addLog(final PrintStream out) { |
85 | final ModuleEventListener log = new DefaultModuleEventListener(out); |
86 | loggers.add(log); |
87 | } |
88 | |
89 | public void addModule(final QedeqBo prop) { |
90 | for (int i = 0; i < loggers.size(); i++) { |
91 | try { // we don't know if the ModuleEventListener is free of programming errors... |
92 | ((ModuleEventListener) loggers.get(i)).addModule(prop); |
93 | } catch (RuntimeException e) { |
94 | Trace.fatal(CLASS, this, "addModule", |
95 | "ModuleEventListener throwed RuntimeException", e); |
96 | } |
97 | } |
98 | } |
99 | |
100 | public void stateChanged(final QedeqBo prop) { |
101 | for (int i = 0; i < loggers.size(); i++) { |
102 | try { // we don't know if the ModuleEventListener is free of programming errors... |
103 | ((ModuleEventListener) loggers.get(i)).stateChanged(prop); |
104 | } catch (RuntimeException e) { |
105 | Trace.fatal(CLASS, this, "stateChanged", |
106 | "ModuleEventListener throwed RuntimeException", e); |
107 | } |
108 | } |
109 | } |
110 | |
111 | public void removeModule(final QedeqBo prop) { |
112 | for (int i = 0; i < loggers.size(); i++) { |
113 | try { // we don't know if the ModuleEventListener is free of programming errors... |
114 | ((ModuleEventListener) loggers.get(i)).removeModule(prop); |
115 | } catch (RuntimeException e) { |
116 | Trace.fatal(CLASS, this, "removeModule", |
117 | "ModuleEventListener throwed RuntimeException", e); |
118 | } |
119 | } |
120 | } |
121 | |
122 | |
123 | } |