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/*
* Copyright (c) 2014 Eike Stepper (Loehne, Germany) and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Eike Stepper - initial API and implementation
*/
package org.eclipse.oomph.util;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* @author Eike Stepper
*/
public final class XMLUtil
{
private XMLUtil()
{
}
public static DocumentBuilder createDocumentBuilder() throws ParserConfigurationException
{
DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();
documentBuilderFactory.setNamespaceAware(true);
documentBuilderFactory.setValidating(false);
return documentBuilderFactory.newDocumentBuilder();
}
public static Document loadDocument(DocumentBuilder documentBuilder, InputStream inputStream) throws SAXException, IOException
{
try
{
return documentBuilder.parse(inputStream);
}
finally
{
IOUtil.close(inputStream);
}
}
public static Document loadDocument(DocumentBuilder documentBuilder, File file) throws SAXException, IOException
{
return documentBuilder.parse(file);
}
public static Element loadRootElement(DocumentBuilder documentBuilder, InputStream inputStream) throws Exception
{
Document document = loadDocument(documentBuilder, inputStream);
return document.getDocumentElement();
}
public static Element loadRootElement(DocumentBuilder documentBuilder, File file) throws Exception
{
Document document = loadDocument(documentBuilder, file);
return document.getDocumentElement();
}
public static int handleElements(NodeList nodeList, ElementHandler handler) throws Exception
{
int count = 0;
for (int i = 0; i < nodeList.getLength(); i++)
{
Node node = nodeList.item(i);
if (node instanceof Element)
{
Element element = (Element)node;
handler.handleElement(element);
++count;
}
}
return count;
}
public static int handleChildElements(Element rootElement, ElementHandler handler) throws Exception
{
NodeList childNodes = rootElement.getChildNodes();
return handleElements(childNodes, handler);
}
public static int handleElementsByTagName(Element rootElement, String tagName, ElementHandler handler) throws Exception
{
int count = 0;
NodeList nodeList = rootElement.getElementsByTagName(tagName);
count += handleElements(nodeList, handler);
int pos = tagName.indexOf(':');
if (pos != -1)
{
tagName = tagName.substring(pos + 1);
nodeList = rootElement.getElementsByTagName(tagName);
count += handleElements(nodeList, handler);
}
return count;
}
/**
* @author Eike Stepper
*/
public interface ElementHandler
{
public void handleElement(Element element) throws Exception;
}
/**
* @author Eike Stepper
*/
public static final class ElementUpdater
{
private final String tagName;
private String textValue;
private int index;
public ElementUpdater(final Element rootElement, String tagName) throws Exception
{
this.tagName = tagName;
handleElementsByTagName(rootElement, tagName, new ElementHandler()
{
public void handleElement(Element element) throws Exception
{
if (element.getParentNode() == rootElement)
{
textValue = element.getTextContent();
}
if (textValue == null)
{
++index;
}
}
});
}
public String update(String text, String newValue)
{
if (!ObjectUtil.equals(textValue, newValue))
{
StringBuilder builder = new StringBuilder();
for (int i = 0; i < index; i++)
{
builder.append(".*?<" + tagName + ">.*?</" + tagName + ">");
}
builder.append(".*?<" + tagName + ">(.*?)</" + tagName + ">.*");
Pattern pattern = Pattern.compile(builder.toString(), Pattern.DOTALL);
Matcher matcher = pattern.matcher(text);
if (matcher.matches())
{
text = text.substring(0, matcher.start(1)) + newValue + text.substring(matcher.end(1));
}
}
return text;
}
}
}
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