--- /dev/null
+/*
+ * This program is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU General Public License as published by the Free Software
+ * Foundation; either version 2 of the License, or (at your option) any later
+ * version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
+ * Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+package de.todesbaum.util.xml;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.io.OutputStreamWriter;
+import java.nio.charset.Charset;
+
+import javax.xml.parsers.DocumentBuilder;
+import javax.xml.parsers.DocumentBuilderFactory;
+import javax.xml.parsers.ParserConfigurationException;
+import javax.xml.transform.Result;
+import javax.xml.transform.Source;
+import javax.xml.transform.Transformer;
+import javax.xml.transform.TransformerConfigurationException;
+import javax.xml.transform.TransformerException;
+import javax.xml.transform.TransformerFactory;
+import javax.xml.transform.dom.DOMResult;
+import javax.xml.transform.dom.DOMSource;
+import javax.xml.transform.stream.StreamResult;
+import javax.xml.transform.stream.StreamSource;
+
+import org.w3c.dom.Document;
+
+
+/**
+ * Contains method to transform DOM XML trees to byte arrays and vice versa.
+ *
+ * @author David Roden <droden@gmail.com>
+ * @version $Id:XML.java 221 2006-03-06 14:46:49Z bombe $
+ */
+public class XML {
+
+ /** Cached document builder factory. */
+ private static DocumentBuilderFactory documentBuilderFactory = null;
+
+ /** Cached document builder. */
+ private static DocumentBuilder documentBuilder = null;
+
+ /** Cached transformer factory. */
+ private static TransformerFactory transformerFactory = null;
+
+ /** Does nothing. */
+ private XML() {
+ }
+
+ /**
+ * Returns a document builder factory. If possible the cached instance will be returned.
+ *
+ * @return A document builder factory
+ */
+ private static DocumentBuilderFactory getDocumentBuilderFactory() {
+ if (documentBuilderFactory != null) {
+ return documentBuilderFactory;
+ }
+ documentBuilderFactory = DocumentBuilderFactory.newInstance();
+ return documentBuilderFactory;
+ }
+
+ /**
+ * Returns a document builder. If possible the cached instance will be returned.
+ *
+ * @return A document builder
+ */
+ private static DocumentBuilder getDocumentBuilder() {
+ if (documentBuilder != null) {
+ return documentBuilder;
+ }
+ try {
+ documentBuilder = getDocumentBuilderFactory().newDocumentBuilder();
+ } catch (ParserConfigurationException e) {
+ }
+ return documentBuilder;
+ }
+
+ /**
+ * Returns a transformer factory. If possible the cached instance will be returned.
+ *
+ * @return A transformer factory
+ */
+ private static TransformerFactory getTransformerFactory() {
+ if (transformerFactory != null) {
+ return transformerFactory;
+ }
+ transformerFactory = TransformerFactory.newInstance();
+ return transformerFactory;
+ }
+
+ /**
+ * Creates a new XML document.
+ *
+ * @return A new XML document
+ */
+ public static Document createDocument() {
+ return getDocumentBuilder().newDocument();
+ }
+
+ /**
+ * Transforms the DOM XML document into a byte array.
+ *
+ * @param document
+ * The document to transform
+ * @return The byte array containing the XML representation
+ */
+ public static byte[] transformToByteArray(Document document) {
+ ByteArrayOutputStream byteOutput = new ByteArrayOutputStream();
+ OutputStreamWriter converter = new OutputStreamWriter(byteOutput, Charset.forName("UTF-8"));
+ Result transformResult = new StreamResult(converter);
+ Source documentSource = new DOMSource(document);
+ try {
+ Transformer transformer = getTransformerFactory().newTransformer();
+ transformer.transform(documentSource, transformResult);
+ byteOutput.close();
+ return byteOutput.toByteArray();
+ } catch (IOException ioe1) {
+ } catch (TransformerConfigurationException tce1) {
+ } catch (TransformerException te1) {
+ } finally {
+ try {
+ byteOutput.close();
+ } catch (IOException ioe1) {
+ }
+ }
+ return null;
+ }
+
+ /**
+ * Transforms the byte array into a DOM XML document.
+ *
+ * @param data
+ * The byte array to parse
+ * @return The DOM XML document
+ */
+ public static Document transformToDocument(byte[] data) {
+ ByteArrayInputStream byteInput = new ByteArrayInputStream(data);
+ InputStreamReader converter = new InputStreamReader(byteInput, Charset.forName("UTF-8"));
+ Source xmlSource = new StreamSource(converter);
+ Result xmlResult = new DOMResult();
+ try {
+ Transformer transformer = getTransformerFactory().newTransformer();
+ transformer.transform(xmlSource, xmlResult);
+ return (Document) ((DOMResult) xmlResult).getNode();
+ } catch (TransformerConfigurationException tce1) {
+ } catch (TransformerException te1) {
+ } finally {
+ if (byteInput != null)
+ try {
+ byteInput.close();
+ } catch (IOException ioe1) {
+ }
+ if (converter != null)
+ try {
+ converter.close();
+ } catch (IOException ioe1) {
+ }
+ }
+ return null;
+ }
+
+}
projects / jSite.git / blobdiff