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/*
* $Id: Hashtree2Node.java,v 1.8 2010-11-01 04:34:51 joehw Exp $
*/
package com.sun.org.apache.xml.internal.utils;
import java.util.Enumeration;
import java.util.Hashtable;
import java.util.Vector;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
/**
* Simple static utility to convert Hashtable to a Node.
*
* Please maintain JDK 1.1.x compatibility; no Collections!
*
* @see com.sun.org.apache.xalan.internal.xslt.EnvironmentCheck
* @see com.sun.org.apache.xalan.internal.lib.Extensions
* @author [email protected]
* @version $Id: Hashtree2Node.java,v 1.8 2010-11-01 04:34:51 joehw Exp $
* @xsl.usage general
*/
public abstract class Hashtree2Node
{
/**
* Convert a Hashtable into a Node tree.
*
* The hash may have either Hashtables as values (in which
* case we recurse) or other values, in which case we print them
* as <item> elements, with a 'key' attribute with the value
* of the key, and the element contents as the value.
*
* 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().
*
* @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))
{
return;
}
// name we will provide a default value for
String elemName = null;
if ((null == name) || ("".equals(name)))
elemName = "appendHashToNode";
else
elemName = name;
try
{
Element hashNode = factory.createElement(elemName);
container.appendChild(hashNode);
Enumeration keys = hash.keys();
Vector v = new Vector();
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.addElement(keyStr);
v.addElement((Hashtable) item);
}
else
{
try
{
// Add item to node
Element node = factory.createElement("item");
node.setAttribute("key", keyStr);
node.appendChild(factory.createTextNode((String)item));
hashNode.appendChild(node);
}
catch (Exception e)
{
Element node = factory.createElement("item");
node.setAttribute("key", keyStr);
node.appendChild(factory.createTextNode("ERROR: Reading " + key + " threw: " + e.toString()));
hashNode.appendChild(node);
}
}
}
// Now go back and do the saved hashes
keys = v.elements();
while (keys.hasMoreElements())
{
// Retrieve name and hash in two steps
String n = (String) keys.nextElement();
Hashtable h = (Hashtable) keys.nextElement();
appendHashToNode(h, n, hashNode, factory);
}
}
catch (Exception e2)
{
// Ooops, just bail (suggestions for a safe thing
// to do in this case appreciated)
e2.printStackTrace();
}
}
}