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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 Token {

    static public final Token START_TOKEN = new Token(Type.START, null);
    static public final Token CURLY_LEFT_TOKEN = new Token(Type.CURLY_LEFT, null);
    static public final Token CURLY_RIGHT_TOKEN = new Token(Type.CURLY_RIGHT, null);
    static public final Token DEFAULT_SEP_TOKEN = new Token(Type.DEFAULT, null);

    public enum Type {
        LITERAL, START, CURLY_LEFT, CURLY_RIGHT, DEFAULT
    }

    Type type;
    String payload;

    public Token(Type type, String payload) {
        this.type = type;
        this.payload = payload;
    }

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

        Token token = (Token) o;

        if (type != token.type)
            return false;
        if (payload != null ? !payload.equals(token.payload) : token.payload != null)
            return false;

        return true;
    }

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

    @Override
    public String toString() {
        String result = "Token{" + "type=" + type;
        if (payload != null)
            result += ", payload='" + payload + '\'';

        result += '}';
        return result;
    }
}