Logback: the reliable, generic, fast and flexible logging framework.
Copyright (C) 1999-2015, 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.
/**
 * Logback: the reliable, generic, fast and flexible logging framework.
 * Copyright (C) 1999-2015, 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.joran.action;

import ch.qos.logback.classic.spi.LoggerContextListener;
import ch.qos.logback.core.spi.ContextAware;
import ch.qos.logback.core.spi.LifeCycle;
import org.xml.sax.Attributes;

import ch.qos.logback.classic.LoggerContext;
import ch.qos.logback.core.joran.action.Action;
import ch.qos.logback.core.joran.spi.ActionException;
import ch.qos.logback.core.joran.spi.InterpretationContext;
import ch.qos.logback.core.util.OptionHelper;

public class LoggerContextListenerAction extends Action {
    boolean inError = false;
    LoggerContextListener lcl;

    @Override
    public void begin(InterpretationContext ec, String name, Attributes attributes) throws ActionException {

        inError = false;

        String className = attributes.getValue(CLASS_ATTRIBUTE);
        if (OptionHelper.isEmpty(className)) {
            addError("Mandatory \"" + CLASS_ATTRIBUTE + "\" attribute not set for <loggerContextListener> element");
            inError = true;
            return;
        }

        try {
            lcl = (LoggerContextListener) OptionHelper.instantiateByClassName(className, LoggerContextListener.class, context);

            if (lcl instanceof ContextAware) {
                ((ContextAware) lcl).setContext(context);
            }

            ec.pushObject(lcl);
            addInfo("Adding LoggerContextListener of type [" + className + "] to the object stack");

        } catch (Exception oops) {
            inError = true;
            addError("Could not create LoggerContextListener of type " + className + "].", oops);
        }
    }

    @Override
    public void end(InterpretationContext ec, String name) throws ActionException {
        if (inError) {
            return;
        }
        Object o = ec.peekObject();

        if (o != lcl) {
            addWarn("The object on the top the of the stack is not the LoggerContextListener pushed earlier.");
        } else {
            if (lcl instanceof LifeCycle) {
                ((LifeCycle) lcl).start();
                addInfo("Starting LoggerContextListener");
            }
            ((LoggerContext) context).addListener(lcl);
            ec.popObject();
        }
    }

}