itextpdf.jar is a component in iText 5 Java library to provide core functionalities. iText Java library allows you to generate and manage PDF documents.

The Source Code files are provided at iText GitHub site.

You can compile it to generate your JAR file, using pom.xml as the build configuration file.

The source code of itextpdf-5.5.14.jar is provided below:

⏎ com/itextpdf/text/xml/xmp/XmpReader.java

/*
 *
 * This file is part of the iText (R) project.
    Copyright (c) 1998-2020 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(""));
		}
	}
}

⏎ com/itextpdf/text/xml/xmp/XmpReader.java

Or download all of them as a single archive file:

File name: itextpdf-5.5.14-fyi.zip
File size: 2163839 bytes
Release date: 2009-10-09
Download 

⇒ iText-2.1.6.jar - iText, a JAVA-PDF library

⇐ iText layout.jar Source Code

⇑ Download and Install iText Java Library

⇑⇑ iText for PDF Generation