/*
 *
 * This file is part of the iText (R) project.
    Copyright (c) 1998-2017 iText Group NV
 * Authors: Bruno Lowagie, Paulo Soares, 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: sales@itextpdf.com
 */
package com.itextpdf.text.pdf;

/**
 * Beginning with BaseVersion 1.7, the extensions dictionary lets developers
 * designate that a given document contains extensions to PDF. The presence
 * of the extension dictionary in a document indicates that it may contain
 * developer-specific PDF properties that extend a particular base version
 * of the PDF specification.
 * The extensions dictionary enables developers to identify their own extensions
 * relative to a base version of PDF. Additionally, the convention identifies
 * extension levels relative to that base version. The intent of this dictionary
 * is to enable developers of PDF-producing applications to identify company-specific
 * specifications (such as this one) that PDF-consuming applications use to
 * interpret the extensions.
 * @since	2.1.6
 */
public class PdfDeveloperExtension {

	/** An instance of this class for Adobe 1.7 Extension level 3. */
	public static final PdfDeveloperExtension ADOBE_1_7_EXTENSIONLEVEL3 =
		new PdfDeveloperExtension(PdfName.ADBE, PdfWriter.PDF_VERSION_1_7, 3);
	/** An instance of this class for ETSI 1.7 Extension level 2. */
	public static final PdfDeveloperExtension ESIC_1_7_EXTENSIONLEVEL2 =
		new PdfDeveloperExtension(PdfName.ESIC, PdfWriter.PDF_VERSION_1_7, 2);
	/** An instance of this class for ETSI 1.7 Extension level 5. */
	public static final PdfDeveloperExtension ESIC_1_7_EXTENSIONLEVEL5 =
		new PdfDeveloperExtension(PdfName.ESIC, PdfWriter.PDF_VERSION_1_7, 5);
	
	/** The prefix used in the Extensions dictionary added to the Catalog. */
	protected PdfName prefix;
	/** The base version. */
	protected PdfName baseversion;
	/** The extension level within the baseversion. */
	protected int extensionLevel;
	
	/**
	 * Creates a PdfDeveloperExtension object.
	 * @param prefix	the prefix referring to the developer
	 * @param baseversion	the number of the base version
	 * @param extensionLevel	the extension level within the baseverion.
	 */
	public PdfDeveloperExtension(PdfName prefix, PdfName baseversion, int extensionLevel) {
		this.prefix = prefix;
		this.baseversion = baseversion;
		this.extensionLevel = extensionLevel;
	}

	/**
	 * Gets the prefix name.
	 * @return	a PdfName
	 */
	public PdfName getPrefix() {
		return prefix;
	}

	/**
	 * Gets the baseversion name.
	 * @return	a PdfName
	 */
	public PdfName getBaseversion() {
		return baseversion;
	}

	/**
	 * Gets the extension level within the baseversion.
	 * @return	an integer
	 */
	public int getExtensionLevel() {
		return extensionLevel;
	}
	
	/**
	 * Generations the developer extension dictionary corresponding
	 * with the prefix.
	 * @return	a PdfDictionary
	 */
	public PdfDictionary getDeveloperExtensions() {
		PdfDictionary developerextensions = new PdfDictionary();
		developerextensions.put(PdfName.BASEVERSION, baseversion);
		developerextensions.put(PdfName.EXTENSIONLEVEL, new PdfNumber(extensionLevel));
		return developerextensions;
	}
}