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With inspiration from other libraries
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/**
 * 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.core.joran.action;

import java.util.HashMap;

import org.xml.sax.Attributes;

import ch.qos.logback.core.Appender;
import ch.qos.logback.core.joran.spi.ActionException;
import ch.qos.logback.core.joran.spi.InterpretationContext;
import ch.qos.logback.core.spi.LifeCycle;
import ch.qos.logback.core.util.OptionHelper;

public class AppenderAction extends Action {
    Appender appender;
    private boolean inError = false;

    /**
     * Instantiates an appender of the given class and sets its name.
     * 
     * The appender thus generated is placed in the {@link InterpretationContext}'s
     * appender bag.
     */
    @SuppressWarnings("unchecked")
    public void begin(InterpretationContext ec, String localName, Attributes attributes) throws ActionException {
        // We are just beginning, reset variables
        appender = null;
        inError = false;

        String className = attributes.getValue(CLASS_ATTRIBUTE);
        if (OptionHelper.isEmpty(className)) {
            addError("Missing class name for appender. Near [" + localName + "] line " + getLineNumber(ec));
            inError = true;
            return;
        }

        try {
            addInfo("About to instantiate appender of type [" + className + "]");

            appender = (Appender) OptionHelper.instantiateByClassName(className, ch.qos.logback.core.Appender.class, context);

            appender.setContext(context);

            String appenderName = ec.subst(attributes.getValue(NAME_ATTRIBUTE));

            if (OptionHelper.isEmpty(appenderName)) {
                addWarn("No appender name given for appender of type " + className + "].");
            } else {
                appender.setName(appenderName);
                addInfo("Naming appender as [" + appenderName + "]");
            }

            // The execution context contains a bag which contains the appenders
            // created thus far.
            HashMap> appenderBag = (HashMap>) ec.getObjectMap().get(ActionConst.APPENDER_BAG);

            // add the appender just created to the appender bag.
            appenderBag.put(appenderName, appender);

            ec.pushObject(appender);
        } catch (Exception oops) {
            inError = true;
            addError("Could not create an Appender of type [" + className + "].", oops);
            throw new ActionException(oops);
        }
    }

    /**
     * Once the children elements are also parsed, now is the time to activate the
     * appender options.
     */
    public void end(InterpretationContext ec, String name) {
        if (inError) {
            return;
        }

        if (appender instanceof LifeCycle) {
            ((LifeCycle) appender).start();
        }

        Object o = ec.peekObject();

        if (o != appender) {
            addWarn("The object at the of the stack is not the appender named [" + appender.getName() + "] pushed earlier.");
        } else {
            ec.popObject();
        }
    }
}