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.descriptor.DescriptorService;

 import org.trails.descriptor.IPropertyDescriptor;

 /**

  * Squeezes a {@link IPropertyDescriptor}

  */

 public class PropertyDescriptorSqueezerStrategy implements SqueezeAdaptor

 {

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

         public static final String PREFIX = "W";

         private DescriptorService descriptorService;

         public Class getDataClass()

         {

                 return IPropertyDescriptor.class;

         }

         public String getPrefix()

         {

                 return PREFIX;

         }

         public DescriptorService getDescriptorService()

         {

                 return descriptorService;

         }

         public void setDescriptorService(DescriptorService descriptorService)

         {

                 this.descriptorService = descriptorService;

         }

         public String squeeze(DataSqueezer squeezer, Object object)

         {

                 final IPropertyDescriptor propertyDescriptor = (IPropertyDescriptor) object;

                 if (LOG.isDebugEnabled())

                 {

                         LOG.debug("squeezing: " + propertyDescriptor.getBeanType().getName() + "." + propertyDescriptor.getName());

                 }

                 final String squeezed = squeezer.squeeze(propertyDescriptor.getBeanType());

                 return PREFIX + squeezed + "." + propertyDescriptor.getName();

         }

         public Object unsqueeze(DataSqueezer squeezer, String string)

         {

                 if (LOG.isDebugEnabled())

                 {

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

                 }

                 final int dotIndex = string.lastIndexOf(".");

                 final String squeezed = string.substring(PREFIX.length(), dotIndex);

                 final String propertyName = string.substring(dotIndex + 1);

                 final Class clazz = (Class) squeezer.unsqueeze(squeezed);

                 return getDescriptorService().getClassDescriptor(clazz).getPropertyDescriptor(propertyName);

         }

 }