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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.joran.action;

import org.xml.sax.Attributes;

import ch.qos.logback.core.joran.action.Action;
import ch.qos.logback.core.joran.spi.InterpretationContext;

public class ContextNameAction extends Action {

    public void begin(InterpretationContext ec, String name, Attributes attributes) {
    }

    public void body(InterpretationContext ec, String body) {

        String finalBody = ec.subst(body);
        addInfo("Setting logger context name as [" + finalBody + "]");
        try {
            context.setName(finalBody);
        } catch (IllegalStateException e) {
            addError("Failed to rename context [" + context.getName() + "] as [" + finalBody + "]", e);
        }
    }

    public void end(InterpretationContext ec, String name) {
    }
}