/**
* Logback: the reliable, generic, fast and flexible logging framework.
* Copyright (C) 1999-2011, QOS.ch. All rights reserved.
*
* This program and the accompanying materials are dual-licensed under
* either the terms of the Eclipse Public License v1.0 as published by
* the Eclipse Foundation
*
* or (per the licensee's choosing)
*
* under the terms of the GNU Lesser General Public License version 2.1
* as published by the Free Software Foundation.
*/
package ch.qos.logback.classic.boolex;
import ch.qos.logback.classic.spi.ILoggingEvent;
import ch.qos.logback.core.boolex.EvaluationException;
import ch.qos.logback.core.boolex.EventEvaluatorBase;
import ch.qos.logback.core.util.FileUtil;
import groovy.lang.*;
import org.codehaus.groovy.control.CompilationFailedException;
/**
* @author Ceki Gülcü
*/
public class GEventEvaluator extends EventEvaluatorBase<ILoggingEvent> {
String expression;
IEvaluator delegateEvaluator;
Script script;
public String getExpression() {
return expression;
}
public void setExpression(String expression) {
this.expression = expression;
}
public void start() {
int errors = 0;
if (expression == null || expression.length() == 0) {
addError("Empty expression");
return;
} else {
addInfo("Expression to evaluate [" + expression + "]");
}
ClassLoader classLoader = getClass().getClassLoader();
String currentPackageName = this.getClass().getPackage().getName();
currentPackageName = currentPackageName.replace('.', '/');
FileUtil fileUtil = new FileUtil(getContext());
String scriptText = fileUtil.resourceAsString(classLoader, currentPackageName + "/EvaluatorTemplate.groovy");
if (scriptText == null) {
return;
}
// insert the expression into script text
scriptText = scriptText.replace("//EXPRESSION", expression);
GroovyClassLoader gLoader = new GroovyClassLoader(classLoader);
try {
Class scriptClass = gLoader.parseClass(scriptText);
GroovyObject goo = (GroovyObject) scriptClass.newInstance();
delegateEvaluator = (IEvaluator) goo;
} catch (CompilationFailedException cfe) {
addError("Failed to compile expression [" + expression + "]", cfe);
errors++;
} catch (Exception e) {
addError("Failed to compile expression [" + expression + "]", e);
errors++;
}
if (errors == 0)
super.start();
}
public boolean evaluate(ILoggingEvent event) throws NullPointerException, EvaluationException {
if (delegateEvaluator == null) {
return false;
}
return delegateEvaluator.doEvaluate(event);
}
}