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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.subst;

public class Node {

    enum Type {
        LITERAL, VARIABLE
    }

    Type type;
    Object payload;
    Object defaultPart;
    Node next;

    public Node(Type type, Object payload) {
        this.type = type;
        this.payload = payload;
    }

    public Node(Type type, Object payload, Object defaultPart) {
        this.type = type;
        this.payload = payload;
        this.defaultPart = defaultPart;
    }

    void append(Node newNode) {
        if (newNode == null)
            return;
        Node n = this;
        while (true) {
            if (n.next == null) {
                n.next = newNode;
                return;
            }
            n = n.next;
        }
    }

    @Override
    public String toString() {
        switch (type) {
        case LITERAL:
            return "Node{" + "type=" + type + ", payload='" + payload + "'}";
        case VARIABLE:
            StringBuilder payloadBuf = new StringBuilder();
            StringBuilder defaultPartBuf2 = new StringBuilder();
            if (defaultPart != null)
                recursive((Node) defaultPart, defaultPartBuf2);

            recursive((Node) payload, payloadBuf);
            String r = "Node{" + "type=" + type + ", payload='" + payloadBuf.toString() + "'";
            if (defaultPart != null)
                r += ", defaultPart=" + defaultPartBuf2.toString();
            r += '}';
            return r;
        }
        return null;
    }

    public void dump() {
        System.out.print(this.toString());
        System.out.print(" -> ");
        if (next != null) {
            next.dump();
        } else {
            System.out.print(" null");
        }
    }

    void recursive(Node n, StringBuilder sb) {
        Node c = n;
        while (c != null) {
            sb.append(c.toString()).append(" --> ");
            c = c.next;
        }
        sb.append("null ");
    }

    public void setNext(Node n) {
        this.next = n;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o)
            return true;
        if (o == null || getClass() != o.getClass())
            return false;

        Node node = (Node) o;

        if (type != node.type)
            return false;
        if (payload != null ? !payload.equals(node.payload) : node.payload != null)
            return false;
        if (defaultPart != null ? !defaultPart.equals(node.defaultPart) : node.defaultPart != null)
            return false;
        if (next != null ? !next.equals(node.next) : node.next != null)
            return false;

        return true;
    }

    @Override
    public int hashCode() {
        int result = type != null ? type.hashCode() : 0;
        result = 31 * result + (payload != null ? payload.hashCode() : 0);
        result = 31 * result + (defaultPart != null ? defaultPart.hashCode() : 0);
        result = 31 * result + (next != null ? next.hashCode() : 0);
        return result;
    }
}