1 /*
2  * JavaException.java
3  *
4  * Copyright (C) 2005 Peter Graves
5  * $Id$
6  *
7  * This program is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU General Public License
9  * as published by the Free Software Foundation; either version 2
10  * of the License, or (at your option) any later version.
11  *
12  * This program is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15  * GNU General Public License for more details.
16  *
17  * You should have received a copy of the GNU General Public License
18  * along with this program; if not, write to the Free Software
19  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
20  *
21  * As a special exception, the copyright holders of this library give you
22  * permission to link this library with independent modules to produce an
23  * executable, regardless of the license terms of these independent
24  * modules, and to copy and distribute the resulting executable under
25  * terms of your choice, provided that you also meet, for each linked
26  * independent module, the terms and conditions of the license of that
27  * module.  An independent module is a module which is not derived from
28  * or based on this library.  If you modify this library, you may extend
29  * this exception to your version of the library, but you are not
30  * obligated to do so.  If you do not wish to do so, delete this
31  * exception statement from your version.
32  */
33 
34 package org.armedbear.lisp;
35 
36 import static org.armedbear.lisp.Lisp.*;
37 
38 import java.io.PrintWriter;
39 import java.io.StringWriter;
40 
41 public class JavaException extends LispError
42 {
43     private final Throwable throwable;
44 
JavaException(Throwable throwable)45     public JavaException(Throwable throwable)
46     {
47         super(StandardClass.JAVA_EXCEPTION);
48         Debug.assertTrue(slots.length == 3);
49         Debug.assertTrue(throwable != null);
50         this.throwable = throwable;
51         setInstanceSlotValue(Symbol.CAUSE, new JavaObject(throwable));
52         setFormatControl("Java exception: ~A.");
53         setFormatArguments(new Cons(new JavaObject(throwable)));
54     }
55 
56     @Override
typeOf()57     public LispObject typeOf()
58     {
59         return Symbol.JAVA_EXCEPTION;
60     }
61 
62     @Override
classOf()63     public LispObject classOf()
64     {
65         return StandardClass.JAVA_EXCEPTION;
66     }
67 
68     @Override
typep(LispObject type)69     public LispObject typep(LispObject type)
70     {
71         if (type == Symbol.JAVA_EXCEPTION)
72             return T;
73         if (type == StandardClass.JAVA_EXCEPTION)
74             return T;
75         return super.typep(type);
76     }
77 
78     @Override
getMessage()79     public String getMessage()
80     {
81         StringWriter sw = new StringWriter();
82         PrintWriter pw = new PrintWriter(sw);
83         throwable.printStackTrace(pw);
84         String s = sw.toString();
85         final String separator = System.getProperty("line.separator");
86         if (s.endsWith(separator))
87             s = s.substring(0, s.length() - separator.length());
88         return s;
89     }
90 
91     // ### java-exception-cause java-exception => cause
92     protected static final Primitive JAVA_EXCEPTION_CAUSE =
93         new Primitive(Symbol.JAVA_EXCEPTION_CAUSE, "java-exception",
94 "Returns the cause of JAVA-EXCEPTION. (The cause is the Java Throwable\n" +
95 "  object that caused JAVA-EXCEPTION to be signalled.)")
96     {
97         @Override
98         public LispObject execute(LispObject arg)
99         {
100             return Symbol.STD_SLOT_VALUE.execute(arg, Symbol.CAUSE);
101         }
102     };
103 }
104