/*******************************************************************************
* Copyright (c) 2009-2011 Luaj.org. All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
******************************************************************************/
package org.luaj.vm2;
/**
* RuntimeException that is thrown and caught in response to a lua error.
* <p>
* {@link LuaError} is used wherever a lua call to {@code error()}
* would be used within a script.
* <p>
* 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.
* <p>
*/
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.
* <p>
* 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;
}
}