Convert Hashtable to a Node : DOM Node « XML « Java

Convert Hashtable to a Node

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 * 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.
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 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * $Id: 475902 2006-11-16 20:03:16Z minchau $

import java.util.ArrayList;
import java.util.Enumeration;
import java.util.Hashtable;
import java.util.Iterator;
import java.util.List;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;

 * Simple static utility to convert Hashtable to a Node.  
 * @see org.apache.xalan.xslt.EnvironmentCheck
 * @see org.apache.xalan.lib.Extensions
 * @author
 * @version $Id: 475902 2006-11-16 20:03:16Z minchau $
 * @xsl.usage general
public abstract class Hashtree2Node

     * Convert a Hashtable into a Node tree.  
     * <p>The hash may have either Hashtables as values (in which 
     * case we recurse) or other values, in which case we print them 
     * as &lt;item> elements, with a 'key' attribute with the value 
     * of the key, and the element contents as the value.</p>
     * <p>If args are null we simply return without doing anything. 
     * If we encounter an error, we will attempt to add an 'ERROR' 
     * Element with exception info; if that doesn't work we simply 
     * return without doing anything else byt printStackTrace().</p>
     * @param hash to get info from (may have sub-hashtables)
     * @param name to use as parent element for appended node
     * futurework could have namespace and prefix as well
     * @param container Node to append our report to
     * @param factory Document providing createElement, etc. services
    public static void appendHashToNode(Hashtable hash, String name, 
            Node container, Document factory)
        // Required arguments must not be null
        if ((null == container) || (null == factory) || (null == hash))

        // name we will provide a default value for
        String elemName = null;
        if ((null == name) || ("".equals(name)))
            elemName = "appendHashToNode";
            elemName = name;

            Element hashNode = factory.createElement(elemName);

            Enumeration keys = hash.keys();
            List v = new ArrayList();

            while (keys.hasMoreElements())
                Object key = keys.nextElement();
                String keyStr = key.toString();
                Object item = hash.get(key);

                if (item instanceof Hashtable)
                    // Ensure a pre-order traversal; add this hashes 
                    //  items before recursing to child hashes
                    // Save name and hash in two steps
                    v.add((Hashtable) item);
                        // Add item to node
                        Element node = factory.createElement("item");
                        node.setAttribute("key", keyStr);
                    catch (Exception e)
                        Element node = factory.createElement("item");
                        node.setAttribute("key", keyStr);
                        node.appendChild(factory.createTextNode("ERROR: Reading " + key + " threw: " + e.toString()));

            // Now go back and do the saved hashes
            Iterator it = v.iterator();
            while (it.hasNext())
                // Retrieve name and hash in two steps
                String n = (String);
                Hashtable h = (Hashtable);

                appendHashToNode(h, n, hashNode, factory);
        catch (Exception e2)
            // Ooops, just bail (suggestions for a safe thing 
            //  to do in this case appreciated)


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