import java.io.File;

import java.io.IOException;

import javax.xml.parsers.DocumentBuilder;

import javax.xml.parsers.DocumentBuilderFactory;

import javax.xml.transform.Transformer;

import javax.xml.transform.TransformerFactory;

import javax.xml.transform.dom.DOMSource;

import javax.xml.transform.stream.StreamResult;

import javax.xml.xpath.XPath;

import javax.xml.xpath.XPathConstants;

import javax.xml.xpath.XPathExpression;

import javax.xml.xpath.XPathFactory;

import org.w3c.dom.Document;

import org.w3c.dom.Node;

// Run the program via the cli command "java VersionHelper 2016.3"

// This program will append intellij version to the plugin version.

public class XMLHelper {

public static void main(String argv[]) {

if (argv.length < 4) {

System.out.println("[Failed] Please specify the arguments $XML_FILE $XPATH $NEW_VALUE $JOIN_OR_REPLACE.");

System.exit(1);

}

String FILEPATH = argv[0];

String XPATH = argv[1];

String NEW_VALUE = argv[2];

String CHANGETYPE = argv[3];

boolean DISPLAY_LOG = false;

if (argv.length > 4 && argv[4].toLowerCase().equals("true")) {

DISPLAY_LOG = true;

}

try {

System.out.println("Starting to modify XML " + FILEPATH);

// Read the content from xml file

DocumentBuilderFactory docFactory = DocumentBuilderFactory.newInstance();

DocumentBuilder docBuilder = docFactory.newDocumentBuilder();

Document doc = docBuilder.parse(FILEPATH);

XPathFactory xpathFactory = XPathFactory.newInstance();

XPath xpath = xpathFactory.newXPath();

XPathExpression expression = xpath.compile(XPATH);

Node targetNode = (Node) expression.evaluate(doc, XPathConstants.NODE);

String oldValue = targetNode.getNodeValue();

String newValue = "";

if (CHANGETYPE.equals("JOIN")) {

newValue = oldValue + NEW_VALUE;

}

if (DISPLAY_LOG) {

System.out.println("The old value is " + oldValue);

System.out.println("The new value is " + newValue);

}

targetNode.setNodeValue(newValue);

// Write the content into xml file

TransformerFactory transformerFactory = TransformerFactory.newInstance();

Transformer transformer = transformerFactory.newTransformer();

DOMSource source = new DOMSource(doc);

StreamResult result = new StreamResult(new File(FILEPATH));

transformer.transform(source, result);

System.out.println("Modify XML Finished.");

} catch (Exception e) {

e.printStackTrace();

System.exit(1);

}

System.exit(0);

}

}