org.verapdf.gf.model.impl.cos.GFCosNull Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of validation-model Show documentation

veraPDF PDF/A validation model implementation based on PDF parser.

There is a newer version: 1.26.5

/**
 * This file is part of validation-model, a module of the veraPDF project.
 * Copyright (c) 2015, veraPDF Consortium 
 * All rights reserved.
 *
 * validation-model is free software: you can redistribute it and/or modify
 * it under the terms of either:
 *
 * The GNU General public license GPLv3+.
 * You should have received a copy of the GNU General Public License
 * along with validation-model as the LICENSE.GPL file in the root of the source
 * tree.  If not, see http://www.gnu.org/licenses/ or
 * https://www.gnu.org/licenses/gpl-3.0.en.html.
 *
 * The Mozilla Public License MPLv2+.
 * You should have received a copy of the Mozilla Public License along with
 * validation-model as the LICENSE.MPL file in the root of the source tree.
 * If a copy of the MPL was not distributed with this file, you can obtain one at
 * http://mozilla.org/MPL/2.0/.
 */
package org.verapdf.gf.model.impl.cos;

import org.verapdf.cos.COSNull;
import org.verapdf.model.coslayer.CosNull;

/**
 * @author Timur Kamalov
 */
public class GFCosNull extends GFCosObject implements CosNull {

	/** Type name for GFCosNull */
	public static final String COS_NULL_TYPE = "CosNull";

	/**
	 * PDF null object
	 */
	private static CosNull NULL;

	private GFCosNull(COSNull nil) {
		super(nil, COS_NULL_TYPE);
	}

	/**
	 * Method to get instance of PBCosNull object
	 * @return PBCosNull object
	 */
	public static CosNull getInstance() {
		return NULL == null ? NULL = new GFCosNull(COSNull.NULL) : NULL;
	}

}