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Posted to commits@xalan.apache.org by cu...@apache.org on 2002/06/21 17:39:34 UTC
cvs commit: xml-xalan/java/src/org/apache/xml/utils Hashtree2Node.java
curcuru 2002/06/21 08:39:34
Added: java/src/org/apache/xml/utils Hashtree2Node.java
Log:
Simplistic static utility to convert a Hashtable of items (either
Hashtables or anything else cast to (String)) into an Element tree
Revision Changes Path
1.1 xml-xalan/java/src/org/apache/xml/utils/Hashtree2Node.java
Index: Hashtree2Node.java
===================================================================
/*
* The Apache Software License, Version 1.1
*
*
* Copyright (c) 2002 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Xalan" and "Apache Software Foundation" must
* not be used to endorse or promote products derived from this
* software without prior written permission. For written
* permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache",
* nor may "Apache" appear in their name, without prior written
* permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation and was
* originally based on software copyright (c) 2000, Lotus
* Development Corporation., http://www.lotus.com. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*/
package org.apache.xml.utils;
import java.util.Enumeration;
import java.util.Hashtable;
import java.util.StringTokenizer;
import java.util.Vector;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
/**
* <meta name="usage" content="general"/>
* Simple static utility to convert Hashtable to a Node.
*
* Please maintain JDK 1.1.x compatibility; no Collections!
*
* @see org.apache.xalan.xslt.EnvironmentCheck
* @see org.apache.xalan.lib.Extensions
* @author shane_curcuru@us.ibm.com
* @version $Id: Hashtree2Node.java,v 1.1 2002/06/21 15:39:34 curcuru Exp $
*/
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 <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))
{
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 enum = hash.keys();
Vector v = new Vector();
while (enum.hasMoreElements())
{
Object key = enum.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
enum = v.elements();
while (enum.hasMoreElements())
{
// Retrieve name and hash in two steps
String n = (String) enum.nextElement();
Hashtable h = (Hashtable) enum.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();
}
}
}
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