/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 org.apache.nutch.util;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
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.DOMSource;
import javax.xml.transform.stream.StreamResult;
import org.apache.xerces.parsers.DOMParser;
import org.w3c.dom.Element;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
// Commons Logging imports
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
public class DomUtil {
private final static Log LOG = LogFactory.getLog(DomUtil.class);
/**
* Returns parsed dom tree or null if any error
*
* @param is
* @return A parsed DOM tree from the given {@link InputStream}.
*/
public static Element getDom(InputStream is) {
Element element = null;
DOMParser parser = new DOMParser();
InputSource input;
try {
input = new InputSource(is);
input.setEncoding("UTF-8");
parser.parse(input);
int i = 0;
while (! (parser.getDocument().getChildNodes().item(i) instanceof Element)) {
i++;
}
element = (Element)parser.getDocument().getChildNodes().item(i);
} catch (FileNotFoundException e) {
e.printStackTrace(LogUtil.getWarnStream(LOG));
} catch (SAXException e) {
e.printStackTrace(LogUtil.getWarnStream(LOG));
} catch (IOException e) {
e.printStackTrace(LogUtil.getWarnStream(LOG));
}
return element;
}
/**
* save dom into ouputstream
*
* @param os
* @param e
*/
public static void saveDom(OutputStream os, Element e) {
DOMSource source = new DOMSource(e);
TransformerFactory transFactory = TransformerFactory.newInstance();
Transformer transformer;
try {
transformer = transFactory.newTransformer();
transformer.setOutputProperty("indent", "yes");
StreamResult result = new StreamResult(os);
transformer.transform(source, result);
os.flush();
} catch (UnsupportedEncodingException e1) {
e1.printStackTrace(LogUtil.getWarnStream(LOG));
} catch (IOException e1) {
e1.printStackTrace(LogUtil.getWarnStream(LOG));
} catch (TransformerConfigurationException e2) {
e2.printStackTrace(LogUtil.getWarnStream(LOG));
} catch (TransformerException ex) {
ex.printStackTrace(LogUtil.getWarnStream(LOG));
}
}
}