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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.pattern.parser;

import java.util.List;

public class SimpleKeywordNode extends FormattingNode {

    List optionList;

    SimpleKeywordNode(Object value) {
        super(Node.SIMPLE_KEYWORD, value);
    }

    protected SimpleKeywordNode(int type, Object value) {
        super(type, value);
    }

    public List getOptions() {
        return optionList;
    }

    public void setOptions(List optionList) {
        this.optionList = optionList;
    }

    public boolean equals(Object o) {
        if (!super.equals(o)) {
            return false;
        }

        if (!(o instanceof SimpleKeywordNode)) {
            return false;
        }
        SimpleKeywordNode r = (SimpleKeywordNode) o;

        return (optionList != null ? optionList.equals(r.optionList) : r.optionList == null);
    }

    @Override
    public int hashCode() {
        return super.hashCode();
    }

    public String toString() {
        StringBuilder buf = new StringBuilder();
        if (optionList == null) {
            buf.append("KeyWord(" + value + "," + formatInfo + ")");
        } else {
            buf.append("KeyWord(" + value + ", " + formatInfo + "," + optionList + ")");
        }
        buf.append(printNext());
        return buf.toString();
    }
}