/**
* Copyright 2012 José Martínez
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package es.udc.pfc.xmpp.xml;
import java.io.StringReader;
import java.io.StringWriter;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.OutputKeys;
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;
import org.w3c.dom.Element;
/**
* XML DOM utilities.
*/
public final class XMLUtil {
private static final DocumentBuilder docBuilder;
private static final Transformer transformer;
static {
try {
final DocumentBuilderFactory docBuilderFactory = DocumentBuilderFactory.newInstance();
docBuilderFactory.setIgnoringElementContentWhitespace(true);
docBuilderFactory.setIgnoringComments(true);
docBuilder = docBuilderFactory.newDocumentBuilder();
transformer = TransformerFactory.newInstance().newTransformer();
transformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "yes");
transformer.setOutputProperty(OutputKeys.INDENT, "no");
} catch (final ParserConfigurationException e) {
throw new InternalError("Error creating Document Builder");
} catch (final TransformerConfigurationException e) {
throw new InternalError("Error creating Transformer");
}
}
/**
* Returns a new Document from the current DocumentBuidler.
*
* @return a new Document
*/
public static final Document newDocument() {
return docBuilder.newDocument();
}
/**
* Parses a String into a new Element.
*
* @param element the String to parse
* @return the parsed Element
*/
public static final Element fromString(final String element) {
try {
final Document doc = newDocument();
transformer.transform(new StreamSource(new StringReader(element)), new DOMResult(doc));
return doc.getDocumentElement();
} catch (final TransformerException e) {
throw new InternalError("Transformer error");
}
}
/**
* Returns the String representation of an Element.
*
* @param element the Element to convert
* @return the String representation of a Element
*/
public static final String toString(final Element element) {
try {
final StringWriter buffer = new StringWriter();
transformer.transform(new DOMSource(element), new StreamResult(buffer));
return buffer.toString();
} catch (final TransformerException e) {
throw new InternalError("Transformer error");
}
}
private XMLUtil() {
}
}