com.lowagie.text.xml.xmp.XmpReader Maven / Gradle / Ivy
/*
* Copyright 2008 by Bruno Lowagie
*
* The contents of this file are subject to the Mozilla Public License Version 1.1
* (the "License"); you may not use this file except in compliance with the License.
* You may obtain a copy of the License at http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the License.
*
* The Original Code is 'iText, a free JAVA-PDF library'.
*
* The Initial Developer of the Original Code is Bruno Lowagie. Portions created by
* the Initial Developer are Copyright (C) 1999, 2000, 2001, 2002 by Bruno Lowagie.
* All Rights Reserved.
* Co-Developer of the code is Paulo Soares. Portions created by the Co-Developer
* are Copyright (C) 2008 by Paulo Soares. All Rights Reserved.
*
* Contributor(s): all the names of the contributors are added in the source code
* where applicable.
*
* Alternatively, the contents of this file may be used under the terms of the
* LGPL license (the "GNU LIBRARY GENERAL PUBLIC LICENSE"), in which case the
* provisions of LGPL are applicable instead of those above. If you wish to
* allow use of your version of this file only under the terms of the LGPL
* License and not to allow others to use your version of this file under
* the MPL, indicate your decision by deleting the provisions above and
* replace them with the notice and other provisions required by the LGPL.
* If you do not delete the provisions above, a recipient may use your version
* of this file under either the MPL or the GNU LIBRARY GENERAL PUBLIC LICENSE.
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the MPL as stated above or under the terms of the GNU
* Library General Public License as published by the Free Software Foundation;
* either version 2 of the License, or any later version.
*
* This library 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 Library general Public License for more
* details.
*
* If you didn't download this code from the following link, you should check if
* you aren't using an obsolete version:
* http://www.lowagie.com/iText/
*/
package com.lowagie.text.xml.xmp;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
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.SAXException;
import com.lowagie.text.ExceptionConverter;
import com.lowagie.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
*/
public class XmpReader {
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();
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 replace(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;
}
/**
* 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;
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())) {
node = domDocument.createElement(localName);
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 Document that contains the node
* @param n the Node 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(XmpWriter.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(XmpWriter.EXTRASPACE.getBytes());
}
fout.write(XmpWriter.XPACKET_PI_END_W.getBytes());
fout.close();
return fout.toByteArray();
}
}