/*
* *************************************************************************************
* Copyright (C) 2008 EsperTech, Inc. All rights reserved. *
* http://esper.codehaus.org *
* http://www.espertech.com *
* ---------------------------------------------------------------------------------- *
* The software in this package is published under the terms of the GPL license *
* a copy of which has been included with this distribution in the license.txt file. *
* *************************************************************************************
*/
package com.espertech.esper.epl.script.jsr223;
import com.asper.sources.javax.script.*;
import com.espertech.esper.epl.expression.ExprValidationException;
import com.espertech.esper.epl.spec.ExpressionScriptProvided;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
public class JSR223Helper {
private static final Log log = LogFactory.getLog(JSR223Helper.class);
public static CompiledScript verifyCompileScript(ExpressionScriptProvided script, String dialect) throws ExprValidationException {
ScriptEngineManager manager = new ScriptEngineManager();
ScriptEngine engine = manager.getEngineByName(dialect);
if (engine == null) {
throw new ExprValidationException("Failed to obtain script engine for dialect '" + dialect + "' for script '" + script.getName() + "'");
}
engine.put(ScriptEngine.FILENAME, script.getName());
Compilable compilingEngine = (Compilable)engine;
try {
return compilingEngine.compile(script.getExpression());
}
catch (ScriptException ex) {
String message = "Exception compiling script '" + script.getName() + "' of dialect '" + dialect + "': " + getScriptCompileMsg(ex);
log.info(message, ex);
throw new ExprValidationException(message, ex);
}
}
public static String getScriptCompileMsg(ScriptException ex) {
if (ex.getLineNumber() != 1 && ex.getColumnNumber() != -1) {
return "At line " + ex.getLineNumber() + " column " + ex.getColumnNumber() + ": " + ex.getMessage();
}
else {
return ex.getMessage();
}
}
}