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src/var/FeatureModelImplGenerator/src/XMLHelper.java

+import java.io.*;
+import java.util.*;
+
+import org.jdom2.*;
+import org.jdom2.filter.Filters;
+import org.jdom2.input.SAXBuilder;
+import org.jdom2.output.XMLOutputter;
+import org.jdom2.xpath.*;
+
+
+
+/**
+ * Contains methods based on JDOM and Jaxen library that help processing XML files and other misc ones.
+ */
+public class XMLHelper {
+	
+	/**
+	 * Reads an .xml file from file path and returns a JDOM document.
+	 * 
+	 * @param src			The .xml file path
+	 * @return JDOM document
+	 * @throws JDOMException
+	 * @throws IOException
+	 */
+	public static Document readXml(String src) throws JDOMException, IOException {
+		File file = new File(src);
+		SAXBuilder saxBuilder = new SAXBuilder();
+		Document doc = saxBuilder.build(file);
+
+		return doc;
+	}
+	
+	/**
+	 * Saves the given Document as XML to the given path.
+	 * 
+	 * @param oDoc			The JDOM document
+	 * @param sPath			The output path
+	 * @throws IOException
+	 */
+	public static void saveAsXml(Document oDoc, String sPath) throws IOException {
+		FileOutputStream dest = new FileOutputStream(sPath);
+		XMLOutputter xmlOutput = new XMLOutputter();		
+		xmlOutput.output(oDoc, dest);
+	}
+	
+	/**
+	 * Takes a gives directory path and lists all files directly in it.
+	 * (Does not visit sub-directories recursively)
+	 * 
+	 * @param path			Path to the directory
+	 * @return ArrayList with all file names
+	 */
+	public static ArrayList<String> getFileNames(String path) {
+		ArrayList<String> fileNames = new ArrayList<String>();
+		File directory = new File(path);
+		File[] contentList = directory.listFiles();
+
+		for (File file : contentList) {
+			if (file.isFile()) fileNames.add(file.getName());
+		}
+		
+		return fileNames;
+	}
+	
+	/**
+	 * Executes given XPath expression for elements with JDOM Document as source.
+	 * 
+	 * @param doc			The JDOM Document
+	 * @param xPath			XPath expression
+	 * @return List with all elements found or empty list if no match found
+	 */
+	public static List<Element> xQueryElements(Document doc, String xPath) {
+		XPathFactory xFactory = XPathFactory.instance();
+		XPathExpression<Element> expr = xFactory.compile(xPath, Filters.element());
+		List<Element> result = expr.evaluate(doc);
+		
+		return result;
+	}
+	
+	/**
+	 * Executes given XPath expression for elements with Element as source.
+	 * (Expression is executed on the entire Document the Element is attached to!)
+	 * 
+	 * @param elem			The Element
+	 * @param xPath			XPath expression
+	 * @return List with all elements found or empty list if no match found
+	 */
+	public static List<Element> xQueryElements(Element elem, String xPath) {
+		XPathFactory xFactory = XPathFactory.instance();
+		XPathExpression<Element> expr = xFactory.compile(xPath, Filters.element());
+		List<Element> result = expr.evaluate(elem);
+		
+		return result;
+	}
+	
+	/**
+	 * Executes given XPath expression for attributes with JDOM Document as source.
+	 * 
+	 * @param doc			The JDOM Document
+	 * @param xPath			XPath expression
+	 * @return List with all attributes found or empty list if no match found
+	 */
+	public static List<Attribute> xQueryAttributes(Document doc, String xPath) {
+		XPathFactory xFactory = XPathFactory.instance();
+		XPathExpression<Attribute> expr = xFactory.compile(xPath, Filters.attribute());
+		List<Attribute> result = expr.evaluate(doc);
+		
+		return result;
+	}
+	
+	/**
+	 * Executes given XPath expression for attributes with Element as source.
+	 * (Expression is executed on the entire Document the Element is attached to!)
+	 * 
+	 * @param elem			The Element
+	 * @param xPath			XPath expression
+	 * @return List with all attributes found or empty list if no match found
+	 */
+	public static List<Attribute> xQueryAttributes(Element elem, String xPath) {
+		XPathFactory xFactory = XPathFactory.instance();
+		XPathExpression<Attribute> expr = xFactory.compile(xPath, Filters.attribute());
+		List<Attribute> result = expr.evaluate(elem);
+		
+		return result;
+	}
+	
+	/**
+	 * Searches a document for the first occurrence of an XML tag with JDOM Document as source.
+	 * 
+	 * @param doc			The JDOM Document
+	 * @param elementName	Name of the XML tag
+	 * @return First element found or NULL if no match found
+	 */
+	public static Element searchFirstElement(Document doc, String elementName) {
+		//XPath index starts with 1; [] has a higher precedence than //
+		List<Element> query= xQueryElements(doc, "(//"+elementName+")[1]");
+		
+		if(query.isEmpty()) return null;
+		return query.get(0);
+	}
+	
+	/**
+	 * Searches a document for the first occurrence of an XML tag with Element as source.
+	 * (Expression is executed on the entire Document the Element is attached to!)
+	 * 
+	 * @param elem			The Element
+	 * @param elementName	Name of the XML tag
+	 * @return First element found or NULL if no match found
+	 */
+	public static Element searchFirstElement(Element elem, String elementName) {
+		//XPath index starts with 1; [] has a higher precedence than //
+		List<Element> query= xQueryElements(elem, "(//"+elementName+")[1]");
+		
+		if(query.isEmpty()) return null;
+		return query.get(0);
+	}
+	
+	/**
+	 * Searches a document for all occurrences of an XML tag with JDOM Document as source.
+	 * 
+	 * @param doc			The JDOM Document
+	 * @param elementName	Name of the XML tag
+	 * @return List with all elements found or empty list if no match found
+	 */
+	public static List<Element> searchAllElements(Document doc, String elementName) {
+		return xQueryElements(doc, "//"+elementName);
+	}
+	
+	/**
+	 * Searches a document for all occurrences of an XML tag with Element as source.
+	 * (Expression is executed on the entire Document the Element is attached to!)
+	 * 
+	 * @param elem			The Element
+	 * @param elementName	Name of the XML tag
+	 * @return List with all elements found or empty list if no match found
+	 */
+	public static List<Element> searchAllElements(Element elem, String elementName) {
+		return xQueryElements(elem, "//"+elementName);
+	}
+	
+	/**
+	 * Checks whether two elements have an equal XML tag.
+	 * (Name of the XML tag and all attributes including their order must be equal)
+	 * 
+	 * @param element1		Element1
+	 * @param element2		Element2
+	 * @return true if of equal tag or false if not
+	 */
+	public static boolean equalTag(Element element1, Element element2) {
+		List<Attribute> attributeList1 = element1.getAttributes();
+		List<Attribute> attributeList2 = element2.getAttributes();
+		
+		if(!element1.getName().equals(element2.getName())) return false;
+		if(attributeList1.size()!=attributeList2.size()) return false;
+		for(int i=0; i<attributeList1.size(); i++) {
+			if(!attributeList1.get(i).getName().equals(attributeList2.get(i).getName())) return false;
+			if(!attributeList1.get(i).getValue().equals(attributeList2.get(i).getValue())) return false;
+		}
+		
+		return true;
+	}
+	
+	/**
+	 * Recursive replacement of all text values in destElements with their corresponding 
+	 * new ones from srcElements.
+	 * (srcElements and destElements must be matching tags and have the same depth!)
+	 * 
+	 * @param srcElements		Element list with new values
+	 * @param destElements		Element list with values to be replaced
+	 * @return true if reached deepest Element or false if not
+	 */
+	public static boolean replace(List<Element> srcElements, List<Element> destElements) {
+		if(srcElements.isEmpty()&&destElements.isEmpty()) return true;
+		if(srcElements.isEmpty()^destElements.isEmpty()) {
+			System.err.println("Error during value replacement: Sensor xml trees have mismatching deph (maybe tags with no value)");
+			System.exit(-1);
+		}
+		for(Element src : srcElements) {
+			for(Element dest : destElements) {		
+				if(equalTag(src, dest)) {
+					boolean deadEnd = replace(src.getChildren(), dest.getChildren());
+					if(deadEnd) dest.setText(src.getText());
+					break;
+				}
+			}
+		}
+		
+		return false;
+	}
+	
+	/**
+	 * @param args
+	 */
+	public static void main(String[] args) {
+		
+	}
+}
+