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annotate src/luan/LuaException.java @ 42:786699c78837

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implement try-catch git-svn-id: https://luan-java.googlecode.com/svn/trunk@43 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Sun, 23 Dec 2012 06:36:56 +0000
parents e3624b7cd603
children 80b67b1a653c
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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1 package luan;
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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4 public class LuaException extends Exception {
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5 private final String stackTrace;
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7 public LuaException(LuaState lua,LuaElement el,Object msg) {
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8 super(message(msg),cause(msg));
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9 stackTrace = stackTrace(lua,el,msg);
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10 }
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12 @Override public String getMessage() {
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13 return super.getMessage() + stackTrace;
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14 }
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16 private String message() {
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17 return super.getMessage();
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18 }
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20 private static Throwable cause(Object msg) {
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21 return msg instanceof Throwable ? (Throwable)msg : null;
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22 }
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24 private static String message(Object msg) {
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25 if( msg instanceof LuaException ) {
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26 LuaException le = (LuaException)msg;
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27 return le.message();
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28 } else if( msg instanceof Throwable ) {
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29 Throwable t = (Throwable)msg;
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30 return t.getMessage();
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31 } else {
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32 return msg.toString();
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33 }
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34 }
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36 private static String stackTrace(LuaState lua,LuaElement el,Object msg) {
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37 StringBuilder buf = new StringBuilder();
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38 int i = lua.stackTrace.size() - 1;
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39 do {
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40 StackTraceElement stackTraceElement = lua.stackTrace.get(i);
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41 buf.append( "\n\t" ).append( el.toString(stackTraceElement.fnName) );
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42 el = stackTraceElement.call;
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43 } while( --i >= 0 );
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44 if( msg instanceof LuaException ) {
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45 LuaException le = (LuaException)msg;
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46 buf.append( "\ncaused by:" ).append( le.stackTrace );
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47 }
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48 return buf.toString();
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49 }
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50 }