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XMLDataBuilder.java
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XMLDataBuilder.java
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/*
* Copyright (c) 2000, 2017 Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2020, 2022 Contributors to the Eclipse Foundation
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0, which is available at
* http://www.eclipse.org/legal/epl-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception, which is available at
* https://www.gnu.org/software/classpath/license.html.
*
* SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
*/
package com.sun.messaging.ums.dom.util;
import java.io.ByteArrayOutputStream;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
/**
*
* This is a utility class to build XML document as a UMS response message.
*
*/
public class XMLDataBuilder {
public static final String UMSNS = "https://mq.java.net/ums";
private static final String UMS_ENVELOPE = "ums";
/**
* Get a new instance of UMS xml document.
*
* @return a new instance of UMS document.
*/
public static Document newUMSDocument() {
Document doc = MyInstance.parser.newDocument();
Element root = doc.createElementNS(UMSNS, UMS_ENVELOPE);
doc.appendChild(root);
return doc;
}
/**
* Get the root element of the UMS XML document.
*
* @param doc The document in which to get the root element.
* @return The root element of the document.
*/
public static Element getRootElement(Document doc) {
Element element = doc.getDocumentElement();
return element;
}
/**
* Add the specified child element to the parent element.
*
* @param parent The parent element.
* @param child The child element.
* @return The child element.
*/
public static Node addChildElement(Element parent, Element child) {
return parent.appendChild(child);
}
/**
* Create a new ums xml element for the specified document.
*
* @param doc the doc from which the element is created.
* @param elementName the name of the xml element.
* @return the created element.
*/
public static Element createUMSElement(Document doc, String elementName) {
Element element = doc.createElementNS(UMSNS, elementName);
return element;
}
/**
* Set the text value to the specified ums xml element.
*
* @param doc the document associated with the element.
* @param element the element in which the text value is set to.
* @param value the value to set to the xml element.
*/
public static void setElementValue(Document doc, Element element, String value) {
Node node = doc.createTextNode(value);
element.appendChild(node);
}
/**
* Set the specified attribute name/value to the element.
*/
public static void setElementAttribute(Element element, String attrName, String attrValue) {
element.setAttribute(attrName, attrValue);
}
/**
* Transform the specified xml document to a string.
*/
public static String domToString(Document doc) throws TransformerConfigurationException, TransformerException {
doc.normalizeDocument();
DOMSource domSource = new DOMSource(doc);
ByteArrayOutputStream baos = new ByteArrayOutputStream();
StreamResult sr = new StreamResult(baos);
Transformer transformer = MyInstance.transformerFactory.newTransformer();
transformer.transform(domSource, sr);
String xml = baos.toString();
return xml;
}
/**
* my private singleton objects.
*/
private static class MyInstance {
private static final DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
private static DocumentBuilder parser = null;
private static TransformerFactory transformerFactory = TransformerFactory.newInstance();
// private static Transformer transformer = null;
static {
try {
parser = factory.newDocumentBuilder();
// transformer = transformerFactory.newTransformer();
} catch (Exception e) {
e.printStackTrace();
}
}
}
}