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Parses XML to PDF, with CSS support, using iText
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/*
 *
 * This file is part of the iText (R) project.
    Copyright (c) 1998-2022 iText Group NV
 * Authors: Balder Van Camp, Emiel Ackermann, et al.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License version 3
 * as published by the Free Software Foundation with the addition of the
 * following permission added to Section 15 as permitted in Section 7(a):
 * FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY
 * ITEXT GROUP. ITEXT GROUP DISCLAIMS THE WARRANTY OF NON INFRINGEMENT
 * OF THIRD PARTY RIGHTS
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU Affero General Public License for more details.
 * You should have received a copy of the GNU Affero General Public License
 * along with this program; if not, see http://www.gnu.org/licenses or write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA, 02110-1301 USA, or download the license from the following URL:
 * http://itextpdf.com/terms-of-use/
 *
 * The interactive user interfaces in modified source and object code versions
 * of this program must display Appropriate Legal Notices, as required under
 * Section 5 of the GNU Affero General Public License.
 *
 * In accordance with Section 7(b) of the GNU Affero General Public License,
 * a covered work must retain the producer line in every PDF that is created
 * or manipulated using iText.
 *
 * You can be released from the requirements of the license by purchasing
 * a commercial license. Buying such a license is mandatory as soon as you
 * develop commercial activities involving the iText software without
 * disclosing the source code of your own applications.
 * These activities include: offering paid services to customers as an ASP,
 * serving PDFs on the fly in a web application, shipping iText with a closed
 * source product.
 *
 * For more information, please contact iText Software Corp. at this
 * address: [email protected]
 */
package com.itextpdf.tool.xml;

import java.util.LinkedList;
import java.util.List;
import java.util.Queue;

/**
 * Passed in the pipeline as water through a hose. The process object hold a
 * queue with {@link Writable}s.
 *
 * @author redlab_b
 *
 */
public class ProcessObject {

	private final Queue queue;
	/**
	 *
	 */
	public ProcessObject() {
		queue = new LinkedList();
	}
	/**
	 * @return true if a writable is contained.
	 */
	public boolean containsWritable() {
		return !queue.isEmpty();
	}

	/**
	 * @return a Writable or null if none.
	 */
	public Writable poll() {
		return queue.poll();
	}
	/**
	 * Add a writable.
	 * @param writable the writable to add
	 */
	public void add(final Writable writable) {
		queue.add(writable);
	}
	/**
	 * Adds a list of writable.
	 * @param elems the writables
	 */
	public void addAll(final List elems) {
			queue.addAll(elems);
	}

}