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* This file is part of the BeanShell Java Scripting distribution. *
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package bsh;
import java.io.PrintStream;
import java.lang.reflect.InvocationTargetException;
/**
* TargetError is an EvalError that wraps an exception thrown by the script (or
* by code called from the script). TargetErrors indicate exceptions which can
* be caught within the script itself, whereas a general EvalError indicates
* that the script cannot be evaluated further for some reason.
*
* If the exception is caught within the script it is automatically unwrapped,
* so the code looks like normal Java code. If the TargetError is thrown from
* the eval() or interpreter.eval() method it may be caught and unwrapped to
* determine what exception was thrown.
*/
public class TargetError extends EvalError {
Throwable target;
boolean inNativeCode;
public TargetError(String msg, Throwable t, SimpleNode node, CallStack callstack, boolean inNativeCode) {
super(msg, node, callstack);
target = t;
this.inNativeCode = inNativeCode;
}
public TargetError(Throwable t, SimpleNode node, CallStack callstack) {
this("TargetError", t, node, callstack, false);
}
public Throwable getTarget() {
// check for easy mistake
if (target instanceof InvocationTargetException)
return ((InvocationTargetException) target).getTargetException();
else
return target;
}
public String toString() {
return super.toString() + "\nTarget exception: " + printTargetError(target);
}
public void printStackTrace() {
printStackTrace(false, System.err);
}
public void printStackTrace(PrintStream out) {
printStackTrace(false, out);
}
public void printStackTrace(boolean debug, PrintStream out) {
if (debug) {
super.printStackTrace(out);
out.println("--- Target Stack Trace ---");
}
target.printStackTrace(out);
}
/**
* Generate a printable string showing the wrapped target exception. If the
* proxy mechanism is available, allow the extended print to check for
* UndeclaredThrowableException and print that embedded error.
*
* @param t the exception to be printed.
* @return the printable string.
*/
public String printTargetError(Throwable t) {
String s = target.toString();
if (Capabilities.canGenerateInterfaces())
s += "\n" + xPrintTargetError(t);
return s;
}
/**
* Extended form of print target error. This indirection is used to print
* UndeclaredThrowableExceptions which are possible when the proxy mechanism
* is available.
*
* We are shielded from compile problems by using a bsh script. This is
* acceptable here because we're not in a critical path... Otherwise we'd
* need yet another dynamically loaded module just for this.
*
* @param t the exception to be printed.
* @return the printable string.
*/
public String xPrintTargetError(Throwable t) {
String getTarget = "import java.lang.reflect.UndeclaredThrowableException;" + "String result=\"\";"
+ "while ( target instanceof UndeclaredThrowableException ) {" + " target=target.getUndeclaredThrowable(); "
+ " result+=\"Nested: \"+target.toString();" + "}" + "return result;";
Interpreter i = new Interpreter();
try {
i.set("target", t);
return (String) i.eval(getTarget);
} catch (EvalError e) {
throw new InterpreterError("xprintarget: " + e.toString());
}
}
/**
* Return {@code true} if the TargetError was generated from native code. e.g. if
* the script called into a compiled java class which threw the excpetion.
* We distinguish so that we can print the stack trace for the native code
* case... the stack trace would not be useful if the exception was
* generated by the script. e.g. if the script explicitly threw an
* exception... (the stack trace would simply point to the bsh internals
* which generated the exception).
*
* @return {@code true} if the TargetError was generated from native code.
* {@code false} otherwise.
*/
public boolean inNativeCode() {
return inNativeCode;
}
}
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