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.xml.xmp; import java.io.ByteArrayInputStream; import java.io.ByteArrayOutputStream; import java.io.IOException; import java.io.StringReader; import javax.xml.parsers.DocumentBuilder; import javax.xml.parsers.DocumentBuilderFactory; import javax.xml.parsers.ParserConfigurationException; import org.w3c.dom.Document; import org.w3c.dom.NamedNodeMap; import org.w3c.dom.Node; import org.w3c.dom.NodeList; import org.xml.sax.EntityResolver; import org.xml.sax.InputSource; import org.xml.sax.SAXException; import com.itextpdf.text.ExceptionConverter; import com.itextpdf.text.xml.XmlDomWriter; /** * Reads an XMP stream into an org.w3c.dom.Document objects. * Allows you to replace the contents of a specific tag. * @since 2.1.3 */ @Deprecated public class XmpReader { /** String used to fill the extra space. */ public static final String EXTRASPACE = " \n"; /** * Processing Instruction required at the start of an XMP stream */ public static final String XPACKET_PI_BEGIN = "<?xpacket begin=\"\uFEFF\" id=\"W5M0MpCehiHzreSzNTczkc9d\"?>\n"; /** * Processing Instruction required at the end of an XMP stream for XMP streams that can be updated */ public static final String XPACKET_PI_END_W = "<?xpacket end=\"w\"?>"; private Document domDocument; /** * Constructs an XMP reader * @param bytes the XMP content * @throws ExceptionConverter * @throws IOException * @throws SAXException */ public XmpReader(byte[] bytes) throws SAXException, IOException { try { DocumentBuilderFactory fact = DocumentBuilderFactory.newInstance(); fact.setNamespaceAware(true); DocumentBuilder db = fact.newDocumentBuilder(); db.setEntityResolver(new SafeEmptyEntityResolver()); ByteArrayInputStream bais = new ByteArrayInputStream(bytes); domDocument = db.parse(bais); } catch (ParserConfigurationException e) { throw new ExceptionConverter(e); } } /** * Replaces the content of a tag. * @param namespaceURI the URI of the namespace * @param localName the tag name * @param value the new content for the tag * @return true if the content was successfully replaced * @since 2.1.6 the return type has changed from void to boolean */ public boolean replaceNode(String namespaceURI, String localName, String value) { NodeList nodes = domDocument.getElementsByTagNameNS(namespaceURI, localName); Node node; if (nodes.getLength() == 0) return false; for (int i = 0; i < nodes.getLength(); i++) { node = nodes.item(i); setNodeText(domDocument, node, value); } return true; } /** * Replaces the content of an attribute in the description tag. * @param namespaceURI the URI of the namespace * @param localName the tag name * @param value the new content for the tag * @return true if the content was successfully replaced * @since 5.0.0 the return type has changed from void to boolean */ public boolean replaceDescriptionAttribute(String namespaceURI, String localName, String value) { NodeList descNodes = domDocument.getElementsByTagNameNS("http://www.w3.org/1999/02/22-rdf-syntax-ns#", "Description"); if (descNodes.getLength() == 0) { return false; } Node node; for (int i = 0; i < descNodes.getLength(); i++) { node = descNodes.item(i); Node attr = node.getAttributes().getNamedItemNS(namespaceURI, localName); if (attr != null) { attr.setNodeValue(value); return true; } } return false; } /** * Adds a tag. * @param namespaceURI the URI of the namespace * @param parent the tag name of the parent * @param localName the name of the tag to add * @param value the new content for the tag * @return true if the content was successfully added * @since 2.1.6 */ public boolean add(String parent, String namespaceURI, String localName, String value) { NodeList nodes = domDocument.getElementsByTagName(parent); if (nodes.getLength() == 0) return false; Node pNode; Node node; String prefix; for (int i = 0; i < nodes.getLength(); i++) { pNode = nodes.item(i); NamedNodeMap attrs = pNode.getAttributes(); for (int j = 0; j < attrs.getLength(); j++) { node = attrs.item(j); if (namespaceURI.equals(node.getNodeValue())) { prefix = node.getLocalName(); node = domDocument.createElementNS(namespaceURI, localName); node.setPrefix(prefix); node.appendChild(domDocument.createTextNode(value)); pNode.appendChild(node); return true; } } } return false; } /** * Sets the text of this node. All the child's node are deleted and a new * child text node is created. * @param domDocument the <CODE>Document</CODE> that contains the node * @param n the <CODE>Node</CODE> to add the text to * @param value the text to add */ public boolean setNodeText(Document domDocument, Node n, String value) { if (n == null) return false; Node nc = null; while ((nc = n.getFirstChild()) != null) { n.removeChild(nc); } n.appendChild(domDocument.createTextNode(value)); return true; } /** * Writes the document to a byte array. */ public byte[] serializeDoc() throws IOException { XmlDomWriter xw = new XmlDomWriter(); ByteArrayOutputStream fout = new ByteArrayOutputStream(); xw.setOutput(fout, null); fout.write(XPACKET_PI_BEGIN.getBytes("UTF-8")); fout.flush(); NodeList xmpmeta = domDocument.getElementsByTagName("x:xmpmeta"); xw.write(xmpmeta.item(0)); fout.flush(); for (int i = 0; i < 20; i++) { fout.write(EXTRASPACE.getBytes()); } fout.write(XPACKET_PI_END_W.getBytes()); fout.close(); return fout.toByteArray(); } private static class SafeEmptyEntityResolver implements EntityResolver { public InputSource resolveEntity(String publicId, String systemId) throws SAXException, IOException { return new InputSource(new StringReader("")); } } }