/**
 * 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();
        }
    }

}