Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
//License from project: Apache License 

import org.w3c.dom.Document;

import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerException;
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.XPathExpressionException;
import javax.xml.xpath.XPathFactory;

public class Main {
    public static void writeTo(Document document, File output) {
        try {
            TransformerFactory transformerFactory = TransformerFactory.newInstance();
            Transformer transformer = transformerFactory.newTransformer();
            DOMSource source = new DOMSource(document);

            FileOutputStream outputstream = new FileOutputStream(output);
            StreamResult result = new StreamResult(outputstream);

            // Manually add xml declaration, to force a newline after it.
            String xmlDeclaration = "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n";
            outputstream.write(xmlDeclaration.getBytes());

            // Remove whitespaces outside tags.
            // Essential to make sure the nodes are properly indented.
            XPath xPath = XPathFactory.newInstance().newXPath();
            NodeList nodeList = (NodeList) xPath.evaluate("//text()[normalize-space()='']", document,
                    XPathConstants.NODESET);
            for (int i = 0; i < nodeList.getLength(); ++i) {
                Node node = nodeList.item(i);
                node.getParentNode().removeChild(node);
            }

            // Pretty-print options.
            transformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "yes");
            transformer.setOutputProperty(OutputKeys.INDENT, "yes");
            transformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "4");
            transformer.transform(source, result);

            outputstream.close();
        } catch (TransformerException | IOException | XPathExpressionException e) {
            System.out.println("Failed to write document file" + output.getPath() + ": " + e.toString());
        }
    }
}