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XLT (Xceptance LoadTest) is an extensive load and performance test tool developed and maintained by Xceptance.
/*
* Copyright (c) 2005-2022 Xceptance Software Technologies GmbH
*
* Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.xceptance.common.xml;
import java.io.OutputStream;
import java.io.Writer;
import org.apache.commons.text.StringEscapeUtils;
import org.w3c.dom.Attr;
import org.w3c.dom.CDATASection;
import org.w3c.dom.Comment;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.w3c.dom.Text;
import com.xceptance.xlt.api.util.XltLogger;
/**
* Utility methods for the W3C DOM API classes.
*
* @author Jörg Werner (Xceptance Software Technologies GmbH)
*/
public final class DomUtils
{
/**
* Default constructor. Declared private to prevent external instantiation.
*/
private DomUtils()
{
}
/**
* The default XML pretty printer.
*/
private static final XmlDomPrinter xmlDomPrinter = new XmlDomPrinter(4);
/**
* Returns a pretty-printed tree for the given DOM node and its children.
*
* @param node
* the node to print
* @return the pretty-printed tree as a string
*/
public static String prettyPrintNode(final Node node)
{
return xmlDomPrinter.printNode(node);
}
/**
* Writes a pretty-printed tree for the given DOM node and its children to the specified output stream.
*
* @param node
* the node to print
* @param out
* the target output stream
*/
public static void prettyPrintNode(final Node node, final OutputStream out)
{
xmlDomPrinter.printNode(node, out);
}
/**
* Writes a pretty-printed tree for the given DOM node and its children to the specified writer.
*
* @param node
* the node to print
* @param out
* the target writer
*/
public static void prettyPrintNode(final Node node, final Writer out)
{
xmlDomPrinter.printNode(node, out);
}
/**
* Removes the named elements from the given document.
*
* @param document
* the document to modify
* @param tagName
* the name of the elements to be removed
*/
public static void removeElementsByTagName(final Document document, final String tagName)
{
final NodeList nodes = document.getElementsByTagName(tagName);
while (nodes.getLength() > 0)
{
final Node node = nodes.item(0);
node.getParentNode().removeChild(node);
}
}
/**
* Returns a deep clone of the given {@link Node}. All child nodes will be cloned recursively.
*
* @param node
* the node to clone
* @param document
* the document the clone will belong to
* @return the cloned {@link Node}
*/
public static Node cloneNode(final Node node, final Document document)
{
if (node instanceof Element)
{
return cloneElementNode((Element) node, document);
}
if (node instanceof CDATASection)
{
return cloneCDATA((CDATASection) node, document);
}
if (node instanceof Text)
{
return cloneText((Text) node, document);
}
if (node instanceof Comment)
{
return cloneComment((Comment) node, document);
}
// fallthrough -> unknown type of node -> log warn message and return
// null
XltLogger.runTimeLogger.warn("Don't know how to clone this node: " + node.getClass());
return null;
}
/**
* Returns a clone of the given element node.
*
* @param node
* the node to clone
* @param document
* the document the given node resides in
* @return a clone of given element node
*/
private static Node cloneElementNode(final Element node, final Document document)
{
// create the clone
final Element clone = document.createElement((node).getTagName());
// clone the attributes
final NamedNodeMap attributes = node.getAttributes();
for (int i = 0; i < attributes.getLength(); i++)
{
final Attr attribute = (Attr) attributes.item(i);
clone.setAttribute(attribute.getName(), StringEscapeUtils.escapeXml10(attribute.getValue()));
}
// clone the children
for (Node child = node.getFirstChild(); child != null; child = child.getNextSibling())
{
clone.appendChild(cloneNode(child, document));
}
return clone;
}
/**
* Returns a clone of the given CDATA node.
*
* @param node
* the node to clone
* @param document
* the document the node resides in
* @return a clone of given CDATA node
*/
private static Node cloneCDATA(final CDATASection node, final Document document)
{
return document.createCDATASection(node.getData());
}
/**
* Returns a clone of the given text node.
*
* @param node
* the node to clone
* @param document
* the document the node resides in
* @return a clone of given text node
*/
private static Node cloneText(final Text node, final Document document)
{
return document.createTextNode(StringEscapeUtils.escapeXml10(node.getData()));
}
/**
* Returns a clone of the given comment node.
*
* @param node
* the node to clone
* @param document
* the document the node resides in
* @return a clone of given comment node
*/
private static Node cloneComment(final Comment node, final Document document)
{
return document.createComment(node.getData());
}
}