Re: [Betwixt]: HashMap to XML and back

[Vikram Goyal]

Hi,
I haven't actually run your code and not sure why you are getting null, but 
you must realize that Betwixt relies on a addXXX method in the object to be 
recreated for the hashmap to work. Since your hashmap of hashmap wouldn't 
contain such a method, you need to extend the HashMap class and add such a 
method in.

HTH,
Vikram Goyal
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----- Original Message ----- 
From: "Jaime Garza" <[EMAIL PROTECTED]>
To: <commons-user@jakarta.apache.org>
Sent: Saturday, April 30, 2005 7:49 AM
Subject: [Betwixt]: HashMap to XML and back

Can somebody help me learn how to read a HashMap back with
betwixt/digester?
When I use betwixt to write a HashMap I get a nice XML, but when I try
to read it back, I only get a null.  I am using betwixt 0.6 and digester
1.5.  Yes, this is a map of maps. This is the code

package com.newscale.test;

import java.util.Map;
import java.io.StringWriter;
import org.apache.commons.betwixt.io.BeanWriter;
import java.beans.IntrospectionException;
import org.xml.sax.SAXException;
import java.io.IOException;
import java.util.HashMap;
import org.apache.commons.beanutils.BeanUtils;
import java.lang.reflect.*;
import java.io.StringReader;
import org.apache.commons.betwixt.io.BeanReader;

public class Betwixt {
 private String convertToString(HashMap map) throws
IntrospectionException, SAXException, IOException {
   if (map == null) {
     return null;
   }
   StringWriter outputWriter = new StringWriter();
   BeanWriter beanWriter = new BeanWriter(outputWriter);
   beanWriter.enablePrettyPrint();
   beanWriter.getBindingConfiguration().setMapIDs(false);
beanWriter.getXMLIntrospector().getConfiguration().setAttributesForPrimi
tives(false);

   beanWriter.write("map", map);
   return outputWriter.toString();
 }

 private HashMap convertToMap(String s) throws SAXException,
IOException, IntrospectionException {
   StringReader reader = new StringReader(s);
   BeanReader beanReader = new BeanReader();
   beanReader.getBindingConfiguration().setMapIDs(false);
beanReader.getXMLIntrospector().getConfiguration().setAttributesForPrimi
tives(false);
   beanReader.registerBeanClass("map", java.util.HashMap.class);
   HashMap map = (HashMap) beanReader.parse(reader); // returns null
always!
   return map;
 }

 public static void main(String[] args) throws Exception {
   HashMap hash = new HashMap();
   Map sub1 = new HashMap();

   sub1.put("sub1i", new Integer(3));
   sub1.put("sub1d", new Double(5.0));
   sub1.put("sub1s", "this is a test & check");

   hash.put("sub1", sub1);
   Betwixt betwixtTester = new Betwixt();
   String xml1 = null;
   String xml2 = null;
   xml1 = betwixtTester.convertToString(hash);
   HashMap hash2 = betwixtTester.convertToMap(xml1);
   xml2 = betwixtTester.convertToString(hash2);
   System.out.println(xml1);
System.out.println("====================================================
==================");
   System.out.println(xml2);
 }

}

Output:
 <map>
   <entry>
     <key>sub1</key>
     <value>
       <entry>
         <key>sub1i</key>
         <value>3</value>
       </entry>
       <entry>
         <key>sub1s</key>
         <value>this is a test &amp; check</value>
       </entry>
       <entry>
         <key>sub1d</key>
         <value>5.0</value>
       </entry>
     </value>
   </entry>
 </map>
======================================================================
null

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