package org.trails.io;

 import org.apache.commons.logging.Log;

 import org.apache.commons.logging.LogFactory;

 import org.apache.tapestry.services.DataSqueezer;

 import org.apache.tapestry.util.io.SqueezeAdaptor;

 import org.trails.exception.TrailsRuntimeException;

 import org.trails.util.Utils;

 /**

  * Squeezes a {@link Class}

  */

 public class ClassAdaptor implements SqueezeAdaptor

 {

         private static final Log LOG = LogFactory.getLog(ClassAdaptor.class);

         public static final String PREFIX = "D";

         public Class getDataClass()

         {

                 return Class.class;

         }

         public String getPrefix()

         {

                 return PREFIX;

         }

         public String squeeze(DataSqueezer squeezer, Object object)

         {

                 if (LOG.isDebugEnabled())

                 {

                         LOG.debug("squeezing: " + object.toString());

                 }

                 return PREFIX + ((Class) object).getName();

         }

         public Object unsqueeze(DataSqueezer squeezer, String string)

         {

                 if (LOG.isDebugEnabled())

                 {

                         LOG.debug("unsqueezing: " + string);

                 }

                 final String className = string.substring(PREFIX.length());

                 try

                 {

                         return Utils.classForName(className);

                 } catch (TrailsRuntimeException cnfe)

                 {

                         throw new TrailsRuntimeException("decode-failure", cnfe);

                 }

         }

 }