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1
30
31 package rcm.util;
32
33 import java.lang.reflect.*;
34 import java.io.PrintStream  ;
35
36 public abstract class Debug {
37 public static final Debug VERBOSE = new Verbose ();
38 public static final Debug QUIET = new Quiet ();
39 public static final Debug NONE = new NoDebug ();
40
41 public static Debug getDebugLevel (Class cls)
42 throws NoSuchFieldException {
43 try {
44 Field fld = cls.getField ("debug");
45 if (fld.getType () != Debug.class
46 || !Modifier.isStatic (fld.getModifiers ()))
47 throw new NoSuchFieldException ();
48 return (Debug) fld.get (null);
49 } catch (IllegalArgumentException e) {
50 throw new NoSuchFieldException ();
51 } catch (IllegalAccessException e) {
52 throw new NoSuchFieldException ();
53 } catch (SecurityException e) {
54 throw new NoSuchFieldException ();
55 }
56 }
57
58 public static void setDebugLevel (Class cls, Debug level)
59 throws NoSuchFieldException {
60 try {
61 Field fld = cls.getField ("debug");
62 if (fld.getType () != Debug.class
63 || !Modifier.isStatic (fld.getModifiers ()))
64 throw new NoSuchFieldException ();
65 fld.set (null, level);
66 } catch (IllegalArgumentException e) {
67 throw new NoSuchFieldException ();
68 } catch (IllegalAccessException e) {
69 throw new NoSuchFieldException ();
70 } catch (SecurityException e) {
71 throw new NoSuchFieldException ();
72 }
73 }
74
75 public abstract boolean isEnabled ();
76 public abstract void print (String message);
77 public abstract void println (String message);
78 public abstract void print (Object obj);
79 public abstract void println (Object obj);
80 public abstract void report (Throwable t);
81 public abstract void printThreadInfo ();
82 public abstract void printStackTrace ();
83 public abstract void assertion (boolean f);
84
85 public static class Verbose extends Debug {
86 protected PrintStream out;
87
88 public Verbose () {
89 this (System.err);
90 }
91
92 public Verbose (PrintStream out) {
93 this.out = out;
94 }
95
96 public boolean isEnabled () {
97 return true;
98 }
99
100 public void print (String message) {
101 out.print (message);
102 out.flush ();
103 }
104
105 public void println (String message) {
106 out.println (message);
107 out.flush ();
108 }
109
110 public void print (Object obj) {
111 print (obj.toString ());
112 }
113
114 public void println (Object obj) {
115 println (obj.toString ());
116 }
117
118 public void report (Throwable t) {
119 t.printStackTrace (out);
120 out.flush ();
121 }
122
123 public void printThreadInfo () {
124 ThreadGroup g = Thread.currentThread().getThreadGroup ();
125 Thread [] t = new Thread [g.activeCount ()];
126 g.enumerate (t);
127 out.println ("Active threads in " + g);
128 for (int i=0; i<t.length; ++i)
129 out.println (t[i]);
130 out.flush ();
131 }
132
133 public void printStackTrace () {
134 try {
135 throw new Exception ();
136 } catch (Exception e) {
137 e.printStackTrace (out);
138 out.flush ();
139 }
140 }
141
142 public void assertion (boolean f) {
143 if (!f)
144 throw new RuntimeException ("assertion failure");
145 }
146 }
147
148 public static class Quiet extends Verbose {
149 public Quiet () {
150 }
151
152 public Quiet (PrintStream out) {
153 super (out);
154 }
155
156 public boolean isEnabled () {
157 return false;
158 }
159
160 public void print (String message) {
161 }
162 public void println (String message) {
163 }
164 public void print (Object message) {
165 }
166 public void println (Object message) {
167 }
168 public void report (Throwable t) {
169 t.printStackTrace (out);
170 out.flush ();
171 }
172 public void printThreadInfo () {
173 }
174 public void printStackTrace () {
175 }
176 public void assertion (boolean f) {
177 if (!f) {
178 try {
179 throw new RuntimeException ("assertion failure");
180 } catch (RuntimeException e) {
181 e.printStackTrace (out);
182 out.flush ();
183 }
184 }
185 }
186 }
187
188 public static class NoDebug extends Debug {
189 public boolean isEnabled () {
190 return false;
191 }
192
193 public void print (String message) {
194 }
195 public void println (String message) {
196 }
197 public void print (Object message) {
198 }
199 public void println (Object message) {
200 }
201 public void report (Throwable t) {
202 }
203 public void printThreadInfo () {
204 }
205 public void printStackTrace () {
206 }
207 public void assertion (boolean f) {
208 }
209 }
210
211 }
212 |
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