Re: Digester: setting a java.net.URL property

[Eric Galluzzo]

Brian Sayatovic/AMIG wrote:

I have an XML file that contains this sort of element:

       <FtpUrl>ftp://user:[EMAIL PROTECTED]:21/some/path</FtpUrl>

I also have a Config object that has a java.net.URL property with a 
getter/setter:

       public class MyConfig {
               // ...
               public URL getFtpUrl();
               public void setFtpUrl(URL url);
               // ...
       }
However, I can't decide how to tie these together with Digester.  I 
couldn't get a bean property setter to work, I suspect because there is no 
conversion between the String in the XML file and a java.net.URL.

That's right.  Try creating a new BeanUtils Converter, something like:

package whatever;

import java.net.MalformedURLException;
import org.apache.commons.beanutils.Converter;
public class URLConverter implements Converter
{
  public Object convert(Class type, Object value)
  {
     if ( value == null )
     {
        return null;
     }
     else if ( value instanceof URL )
     {
        return value;
     }
     else // assume it's a string
     {
        String strValue = (String) value;
        if ( strValue.equals( "" ) )
        {
           return null;
        }
        else
        {
           try
           {
              return new URL( strValue );
           }
           catch ( MalformedURLException mue )
           {
              return null; // FIXME: Should log the error somehow
           }
        }
     }
  }
}
Then register it with BeanUtils' ConvertUtils class, thus:

import org.apache.commons.beanutils.ConvertUtils;
import whatever.URLConverter;
...
// Near the beginning of your app...
ConvertUtils.register( new URLConverter(), URL.class );
...
Warning: The above may not quite compile, but you can probably figure it 
out from there.

   - Eric



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