Java tutorial
/* * * This file is part of the iText (R) project. Copyright (c) 1998-2019 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; import java.lang.reflect.Field; import java.lang.reflect.InvocationTargetException; import java.lang.reflect.Method; /** * This class contains version information about iText. * DO NOT CHANGE THE VERSION INFORMATION WITHOUT PERMISSION OF THE COPYRIGHT HOLDERS OF ITEXT. * Changing the version makes it extremely difficult to debug an application. * Also, the nature of open source software is that you honor the copyright of the original creators of the software. */ public final class Version { private static final Object staticLock = new Object(); // membervariables /** String that will indicate if the AGPL version is used. */ public static String AGPL = " (AGPL-version)"; /** The iText version instance. */ private static volatile Version version = null; /** * This String contains the name of the product. * iText is a registered trademark by iText Group NV. * Please don't change this constant. */ private final String iText = "iText\u00ae"; /** * This String contains the version number of this iText release. * For debugging purposes, we request you NOT to change this constant. */ private final String release = "5.5.13.1"; /** * This String contains the iText version as shown in the producer line. * iText is a product developed by iText Group NV. * iText Group requests that you retain the iText producer line * in every PDF that is created or manipulated using iText. */ private String iTextVersion = iText + " " + release + " \u00a92000-2019 iText Group NV"; /** * The license key. */ private String key = null; /** * Gets an instance of the iText version that is currently used. * Note that iText Group requests that you retain the iText producer line * in every PDF that is created or manipulated using iText. */ public static Version getInstance() { synchronized (staticLock) { if (version != null) { return version; } } Version localVersion = new Version(); try { Class<?> klass = Class.forName("com.itextpdf.licensekey.LicenseKey"); Class[] cArg = { String.class }; Method m = klass.getMethod("getLicenseeInfoForVersion", cArg); Object[] args = { localVersion.release }; String[] info = (String[]) m.invoke(klass.newInstance(), args); if (info[3] != null && info[3].trim().length() > 0) { localVersion.key = info[3]; } else { localVersion.key = "Trial version "; if (info[5] == null) { localVersion.key += "unauthorised"; } else { localVersion.key += info[5]; } } if (info[4] != null && info[4].trim().length() > 0) { localVersion.iTextVersion = info[4]; } else if (info[2] != null && info[2].trim().length() > 0) { localVersion.iTextVersion += " (" + info[2]; if (!localVersion.key.toLowerCase().startsWith("trial")) { localVersion.iTextVersion += "; licensed version)"; } else { localVersion.iTextVersion += "; " + localVersion.key + ")"; } } else if (info[0] != null && info[0].trim().length() > 0) { // fall back to contact name, if company name is unavailable localVersion.iTextVersion += " (" + info[0]; if (!localVersion.key.toLowerCase().startsWith("trial")) { // we shouldn't have a licensed version without company name, // but let's account for it anyway localVersion.iTextVersion += "; licensed version)"; } else { localVersion.iTextVersion += "; " + localVersion.key + ")"; } } else { throw new Exception(); } } catch (Exception e) { if (dependsOnTheOldLicense()) { throw new RuntimeException( "iText License Library 1.0.* has been deprecated. Please, update to the latest version."); } localVersion.iTextVersion += AGPL; } return atomicSetVersion(localVersion); } private static boolean dependsOnTheOldLicense() { try { Class<?> klass = Class.forName("com.itextpdf.license.LicenseKey"); return klass.getField("PRODUCT_NAME") != null; } catch (Exception e) { return false; } } /** * Gets the product name. * iText Group NV requests that you retain the iText producer line * in every PDF that is created or manipulated using iText. * @return the product name */ public String getProduct() { return iText; } /** * Gets the release number. * iText Group NV requests that you retain the iText producer line * in every PDF that is created or manipulated using iText. * @return the release number */ public String getRelease() { return release; } /** * Returns the iText version as shown in the producer line. * iText is a product developed by iText Group NV. * iText Group requests that you retain the iText producer line * in every PDF that is created or manipulated using iText. * @return iText version */ public String getVersion() { return iTextVersion; } /** * Returns a license key if one was provided, or null if not. * @return a license key. */ public String getKey() { return key; } /** * Checks if the AGPL version is used. * @return returns true if the AGPL version is used. */ public static boolean isAGPLVersion() { return getInstance().getVersion().indexOf(AGPL) > 0; } private static Version atomicSetVersion(Version newVersion) { synchronized (staticLock) { version = newVersion; return version; } } }