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With inspiration from other libraries

There is a newer version: 2.12.15

/**
 * 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.sift;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import org.xml.sax.Attributes;

import ch.qos.logback.core.joran.action.Action;
import ch.qos.logback.core.joran.event.InPlayListener;
import ch.qos.logback.core.joran.event.SaxEvent;
import ch.qos.logback.core.joran.spi.ActionException;
import ch.qos.logback.core.joran.spi.InterpretationContext;

public class SiftAction extends Action implements InPlayListener {
    List seList;

    @Override
    public void begin(InterpretationContext ic, String name, Attributes attributes) throws ActionException {
        seList = new ArrayList();
        ic.addInPlayListener(this);
    }

    @Override
    public void end(InterpretationContext ic, String name) throws ActionException {
        ic.removeInPlayListener(this);
        Object o = ic.peekObject();
        if (o instanceof SiftingAppender) {
            SiftingAppender sa = (SiftingAppender) o;
            Map propertyMap = ic.getCopyOfPropertyMap();
            AppenderFactoryUsingJoran appenderFactory = new AppenderFactoryUsingJoran(seList, sa.getDiscriminatorKey(), propertyMap);
            sa.setAppenderFactory(appenderFactory);
        }
    }

    public void inPlay(SaxEvent event) {
        seList.add(event);
    }

    public List getSeList() {
        return seList;
    }

}