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package org.luaj.vm2;
/**
* RuntimeException that is thrown and caught in response to a lua error.
*
* {@link LuaError} is used wherever a lua call to {@code error()}
* would be used within a script.
*
* Since it is an unchecked exception inheriting from {@link RuntimeException},
* Java method signatures do notdeclare this exception, althoug it can
* be thrown on almost any luaj Java operation.
* This is analagous to the fact that any lua script can throw a lua error at any time.
*
*/
public class LuaError extends RuntimeException {
private static final long serialVersionUID = 1L;
protected int level;
protected String fileline;
protected String traceback;
protected Throwable cause;
public String getMessage() {
if (traceback != null)
return traceback;
String m = super.getMessage();
if (m == null)
return null;
if (fileline != null)
return fileline + " " + m;
return m;
}
/** Construct LuaError when a program exception occurs.
*
* All errors generated from lua code should throw LuaError(String) instead.
* @param cause the Throwable that caused the error, if known.
*/
public LuaError(Throwable cause) {
super( "vm error: "+cause );
this.cause = cause;
this.level = 1;
}
/**
* Construct a LuaError with a specific message.
*
* @param message message to supply
*/
public LuaError(String message) {
super( message );
this.level = 1;
}
/**
* Construct a LuaError with a message, and level to draw line number information from.
* @param message message to supply
* @param level where to supply line info from in call stack
*/
public LuaError(String message, int level) {
super( message );
this.level = level;
}
/**
* Get the cause, if any.
*/
public Throwable getCause() {
return cause;
}
}