com.iflytek.spider.util.DomUtil.java Source code

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Here is the source code for com.iflytek.spider.util.DomUtil.java

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/*
 * 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 com.iflytek.spider.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.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.xerces.parsers.DOMParser;
import org.w3c.dom.Element;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
// Commons Logging imports

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));
        }
    }
}