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/* Copyright (c) 2001-2021, The HSQL Development Group
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * Neither the name of the HSQL Development Group nor the names of its
 * contributors may be used to endorse or promote products derived from this
 * software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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package org.hsqldb.cmdline.sqltool;

import java.util.ArrayList;

/* @(#)$Id: TokenList.java 6266 2021-01-25 16:08:06Z fredt $ */

/**
 * A list of SqlFile Tokens
 */
public class TokenList extends ArrayList implements TokenSource {
    static final long serialVersionUID = 5441418591320947274L;

    public TokenList() {
        super();
    }
    public TokenList(TokenList inList) {
        super(inList);
    }
    public Token yylex() {
        if (size() < 1) return null;
        //return remove(0);
        // Java5
        return remove(0);
    }

    public TokenList dup() {
        return new TokenList(this);
    }
}