org.openamf.util.XMLUtils.java Source code

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Here is the source code for org.openamf.util.XMLUtils.java

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/*
 * www.openamf.org
 *
 * Distributable under LGPL license.
 * See terms of license at gnu.org.
 */

package org.openamf.util;

import java.io.IOException;
import java.io.InputStream;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.InputSource;

/**
 * @author Jason Calabrese <mail@jasoncalabrese.com>
 * @see OpenAMFUtils
  * @version $Revision: 1.7 $, $Date: 2004/03/16 04:33:39 $
  */
public final class XMLUtils {

    protected static Log log = LogFactory.getLog(XMLUtils.class);

    private XMLUtils() {
        // this constructor is intentionally private
    }

    public static String convertDOMToString(Node node) {
        StringBuffer sb = new StringBuffer();
        if (node.getNodeType() == Node.TEXT_NODE) {
            sb.append(node.getNodeValue());
        } else {
            String currentTag = node.getNodeName();
            sb.append('<');
            sb.append(currentTag);
            appendAttributes(node, sb);
            sb.append('>');
            if (node.getNodeValue() != null) {
                sb.append(node.getNodeValue());
            }

            appendChildren(node, sb);

            appendEndTag(sb, currentTag);
        }
        return sb.toString();
    }

    private static void appendAttributes(Node node, StringBuffer sb) {
        if (node instanceof Element) {
            NamedNodeMap nodeMap = node.getAttributes();
            for (int i = 0; i < nodeMap.getLength(); i++) {
                sb.append(' ');
                sb.append(nodeMap.item(i).getNodeName());
                sb.append('=');
                sb.append('"');
                sb.append(nodeMap.item(i).getNodeValue());
                sb.append('"');
            }
        }
    }

    private static void appendChildren(Node node, StringBuffer sb) {
        if (node.hasChildNodes()) {
            NodeList children = node.getChildNodes();
            for (int i = 0; i < children.getLength(); i++) {
                sb.append(convertDOMToString(children.item(i)));
            }
        }
    }

    private static void appendEndTag(StringBuffer sb, String currentTag) {
        sb.append('<');
        sb.append('/');
        sb.append(currentTag);
        sb.append('>');
    }

    /**
     * Reads XML Document from input stream
     * 
     * @param is
     * @return Document
     * @throws IOException
     */
    public static Document convertToDOM(InputStream is) throws IOException {
        Document document = null;
        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
        is.skip(4); // skip length
        try {
            DocumentBuilder builder = factory.newDocumentBuilder();
            document = builder.parse(new InputSource(is));
        } catch (Exception e) {
            log.error(e, e);
            throw new IOException("Error while parsing xml: " + e.getMessage());
        }
        return document;
    }
}