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Java Source Code / Java Documentation » Swing Library » jEdit » org.gjt.sp.jedit.bsh 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*****************************************************************************
002:         *                                                                           *
003:         *  This file is part of the BeanShell Java Scripting distribution.          *
004:         *  Documentation and updates may be found at http://www.beanshell.org/      *
005:         *                                                                           *
006:         *  Sun Public License Notice:                                               *
007:         *                                                                           *
008:         *  The contents of this file are subject to the Sun Public License Version  *
009:         *  1.0 (the "License"); you may not use this file except in compliance with *
010:         *  the License. A copy of the License is available at http://www.sun.com    * 
011:         *                                                                           *
012:         *  The Original Code is BeanShell. The Initial Developer of the Original    *
013:         *  Code is Pat Niemeyer. Portions created by Pat Niemeyer are Copyright     *
014:         *  (C) 2000.  All Rights Reserved.                                          *
015:         *                                                                           *
016:         *  GNU Public License Notice:                                               *
017:         *                                                                           *
018:         *  Alternatively, the contents of this file may be used under the terms of  *
019:         *  the GNU Lesser General Public License (the "LGPL"), in which case the    *
020:         *  provisions of LGPL are applicable instead of those above. If you wish to *
021:         *  allow use of your version of this file only under the  terms of the LGPL *
022:         *  and not to allow others to use your version of this file under the SPL,  *
023:         *  indicate your decision by deleting the provisions above and replace      *
024:         *  them with the notice and other provisions required by the LGPL.  If you  *
025:         *  do not delete the provisions above, a recipient may use your version of  *
026:         *  this file under either the SPL or the LGPL.                              *
027:         *                                                                           *
028:         *  Patrick Niemeyer (pat@pat.net)                                           *
029:         *  Author of Learning Java, O'Reilly & Associates                           *
030:         *  http://www.pat.net/~pat/                                                 *
031:         *                                                                           *
032:         *****************************************************************************/package org.gjt.sp.jedit.bsh;
033:
034:        import java.lang.reflect.InvocationTargetException;
035:
036:        import java.io.PrintStream;
037:
038:        /**
039:         TargetError is an EvalError that wraps an exception thrown by the script	
040:         (or by code called from the script).  TargetErrors indicate exceptions 
041:         which can be caught within the script itself, whereas a general EvalError 
042:         indicates that the script cannot be evaluated further for some reason.
043:        
044:         If the exception is caught within the script it is automatically unwrapped,
045:         so the code looks like normal Java code.  If the TargetError is thrown
046:         from the eval() or interpreter.eval() method it may be caught and unwrapped
047:         to determine what exception was thrown.
048:         */
049:        public class TargetError extends EvalError {
050:            Throwable target;
051:            boolean inNativeCode;
052:
053:            public TargetError(String msg, Throwable t, SimpleNode node,
054:                    CallStack callstack, boolean inNativeCode) {
055:                super (msg, node, callstack);
056:                target = t;
057:                this .inNativeCode = inNativeCode;
058:            }
059:
060:            public TargetError(Throwable t, SimpleNode node, CallStack callstack) {
061:                this ("TargetError", t, node, callstack, false);
062:            }
063:
064:            public Throwable getTarget() {
065:                // check for easy mistake
066:                if (target instanceof  InvocationTargetException)
067:                    return ((InvocationTargetException) target)
068:                            .getTargetException();
069:                else
070:                    return target;
071:            }
072:
073:            public String toString() {
074:                return super .toString() + "\nTarget exception: "
075:                        + printTargetError(target);
076:            }
077:
078:            public void printStackTrace() {
079:                printStackTrace(false, System.err);
080:            }
081:
082:            public void printStackTrace(PrintStream out) {
083:                printStackTrace(false, out);
084:            }
085:
086:            public void printStackTrace(boolean debug, PrintStream out) {
087:                if (debug) {
088:                    super .printStackTrace(out);
089:                    out.println("--- Target Stack Trace ---");
090:                }
091:                target.printStackTrace(out);
092:            }
093:
094:            /**
095:            	Generate a printable string showing the wrapped target exception.
096:            	If the proxy mechanism is available, allow the extended print to
097:            	check for UndeclaredThrowableException and print that embedded error.
098:             */
099:            public String printTargetError(Throwable t) {
100:                String s = target.toString();
101:
102:                if (Capabilities.canGenerateInterfaces())
103:                    s += "\n" + xPrintTargetError(t);
104:
105:                return s;
106:            }
107:
108:            /**
109:            	Extended form of print target error.
110:            	This indirection is used to print UndeclaredThrowableExceptions 
111:            	which are possible when the proxy mechanism is available.
112:
113:            	We are shielded from compile problems by using a bsh script.
114:            	This is acceptable here because we're not in a critical path...
115:            	Otherwise we'd need yet another dynamically loaded module just for this.
116:             */
117:            public String xPrintTargetError(Throwable t) {
118:                String getTarget = "import java.lang.reflect.UndeclaredThrowableException;"
119:                        + "String result=\"\";"
120:                        + "while ( target instanceof UndeclaredThrowableException ) {"
121:                        + "	target=target.getUndeclaredThrowable(); "
122:                        + "	result+=\"Nested: \"+target.toString();"
123:                        + "}"
124:                        + "return result;";
125:                Interpreter i = new Interpreter();
126:                try {
127:                    i.set("target", t);
128:                    return (String) i.eval(getTarget);
129:                } catch (EvalError e) {
130:                    throw new InterpreterError("xprintarget: " + e.toString());
131:                }
132:            }
133:
134:            /**
135:            	Return true if the TargetError was generated from native code.
136:            	e.g. if the script called into a compiled java class which threw
137:            	the excpetion.  We distinguish so that we can print the stack trace
138:            	for the native code case... the stack trace would not be useful if
139:            	the exception was generated by the script.  e.g. if the script
140:            	explicitly threw an exception... (the stack trace would simply point
141:            	to the bsh internals which generated the exception).
142:             */
143:            public boolean inNativeCode() {
144:                return inNativeCode;
145:            }
146:        }
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