Source Code Cross Referenced for EvaluationFailedException.java in  » Scripting » InstantJ » instantj » expression » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Scripting » InstantJ » instantj.expression 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        /**
02:         * InstantJ
03:         * 
04:         * Copyright (C) 2002 Nils Meier
05:         * 
06:         * This library is free software; you can redistribute it and/or
07:         * modify it under the terms of the GNU Lesser General Public
08:         * License as published by the Free Software Foundation; either
09:         * version 2.1 of the License, or (at your option) any later version.
10:         * 
11:         * This library is distributed in the hope that it will be useful,
12:         * but WITHOUT ANY WARRANTY; without even the implied warranty of
13:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14:         * Lesser General Public License for more details.
15:         * 
16:         */package instantj.expression;
17:
18:        import instantj.reflect.ReflectAccess;
19:
20:        /**
21:         * This exception wraps the failed attempt to evaluate an expression
22:         * because of a problem while running the compiled code
23:         *
24:         * @author <A href="mailto:nils@meiers.net">Nils Meier</A>
25:         */
26:        public class EvaluationFailedException extends Exception {
27:
28:            /** the reason - what happened inside the expression */
29:            private Throwable reason;
30:
31:            /**
32:             * Constructor
33:             * @param msg the message
34:             * @param reason the exception that occured
35:             */
36:            public EvaluationFailedException(Throwable reason) {
37:                super (calcMessage(reason));
38:                this .reason = reason;
39:            }
40:
41:            /**
42:             * Getter for the reason why the expression couldn't be evaluated successfully
43:             */
44:            public Throwable getReason() {
45:                return reason;
46:            }
47:
48:            /**
49:             * Computes the error message
50:             */
51:            private static String calcMessage(Throwable reason) {
52:
53:                // The beginning is easy    
54:                String message = "a " + reason.getClass().getName()
55:                        + " occured";
56:
57:                // .. but then we also try to analyze the stacktrace    
58:                // (this is only supported in JDK1.4 so we make it introspective)
59:                try {
60:                    // StackTraceElement[] elements = reason.getStackTrace();
61:                    Object[] elements = (Object[]) ReflectAccess.getInstance()
62:                            .invokeGetter(reason, "stackTrace");
63:                    String line;
64:                    if ((elements != null) && (elements.length > 0)) {
65:                        // line = ""+elements[0].getLineNumber()
66:                        line = ""
67:                                + ReflectAccess.getInstance().invokeGetter(
68:                                        elements[0], "lineNumber");
69:                        // the message
70:                        message += " in line " + line;
71:                    }
72:                } catch (Throwable t) {
73:                }
74:
75:                // Done
76:                return message;
77:            }
78:
79:        }
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