XmlUtil.java

package dk.jarry.util;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileWriter;
import java.io.InputStream;
import java.io.Writer;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;

import org.w3c.dom.Document;

public class XmlUtil {

	public static void prettyPrint(File file) throws Exception {

		if (file == null || !file.isFile()) {
			throw new IllegalArgumentException("file skal være af typen File");
		}

		InputStream in = null;
		try {
			in = new FileInputStream(file);
			prettyPrint(in, file);
		} finally {
			if (in != null) {
				try {
					in.close();
				} catch (Exception e) {
					// Do Nothing
				}
			}
		}
	}

	public static void prettyPrint(File inFile, File outFile) throws Exception {

		if (inFile == null || !inFile.isFile()) {
			throw new IllegalArgumentException("inFile skal være af typen File");
		}

		if (outFile == null || !outFile.isFile()) {
			throw new IllegalArgumentException("outFile skal være af typen File");
		}

		InputStream in = null;
		try {

			in = new FileInputStream(inFile);

			prettyPrint(in, outFile);
		} finally {
			if (in != null) {
				try {
					in.close();
				} catch (Exception e) {
					// Do Nothing
				}
			}
		}
	}

	public static void prettyPrint(InputStream in, File outFile) throws Exception {

		if (in == null) {
			throw new IllegalArgumentException("in må ikke være null");
		}

		if (outFile == null || !outFile.isFile()) {
			throw new IllegalArgumentException("outFile skal være af typen File");
		}

		Writer out = null;

		try {

			DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
			dbf.setValidating(false);

			DocumentBuilder db = dbf.newDocumentBuilder();
			Document document = db.parse(in);

			Transformer tf = TransformerFactory.newInstance().newTransformer();
			tf.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
			tf.setOutputProperty(OutputKeys.INDENT, "yes");

			tf.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "2");

			out = new FileWriter(outFile);
			tf.transform(new DOMSource(document), new StreamResult(out));

		} catch (Exception e) {
			throw e;
		} finally {
			if (out != null) {
				try {
					out.close();
				} catch (Exception e) {
					// Do Nothing
				}
			}

		}

	}

}