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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.core.joran.action;

import org.xml.sax.Attributes;

import ch.qos.logback.core.joran.spi.InterpretationContext;
import ch.qos.logback.core.joran.util.PropertySetter;
import ch.qos.logback.core.joran.util.beans.BeanDescriptionCache;

public class ParamAction extends Action {
    static String NO_NAME = "No name attribute in  element";
    static String NO_VALUE = "No value attribute in  element";
    boolean inError = false;

	private final BeanDescriptionCache beanDescriptionCache;
	public ParamAction(BeanDescriptionCache beanDescriptionCache) {
		this.beanDescriptionCache=beanDescriptionCache;
	}

    public void begin(InterpretationContext ec, String localName, Attributes attributes) {
        String name = attributes.getValue(NAME_ATTRIBUTE);
        String value = attributes.getValue(VALUE_ATTRIBUTE);

        if (name == null) {
            inError = true;
            addError(NO_NAME);
            return;
        }

        if (value == null) {
            inError = true;
            addError(NO_VALUE);
            return;
        }

        // remove both leading and trailing spaces
        value = value.trim();

        Object o = ec.peekObject();
        PropertySetter propSetter = new PropertySetter(beanDescriptionCache,o);
        propSetter.setContext(context);
        value = ec.subst(value);

        // allow for variable substitution for name as well
        name = ec.subst(name);

        // getLogger().debug(
        // "In ParamAction setting parameter [{}] to value [{}].", name, value);
        propSetter.setProperty(name, value);
    }

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

    public void finish(InterpretationContext ec) {
    }
}