[jbossseam-issues] [JBoss JIRA] Created: (JBSEAM-3508) Generic Transform for s:graphicImage

[Daniel Roth (JIRA)]

Generic Transform for s:graphicImage
------------------------------------

                 Key: JBSEAM-3508
                 URL: https://jira.jboss.org/jira/browse/JBSEAM-3508
             Project: Seam
          Issue Type: Feature Request
          Components: JSF Controls
    Affects Versions: 2.1.0.CR1, 2.0.3.CR1
            Reporter: Daniel Roth
            Assignee: Daniel Roth
            Priority: Minor


Image transforms for s:graphicImage is a really neat feature. However, there are quite a few reqests for features and additions and I think it will really hard to satisfy all at the same time. Therefore it would be great if one could define one's own image transformer. The tag would essentially delegate the transformation to a defined class:

public abstract class UITransformImageGeneric extends UIComponentBase implements ImageTransform
{

   public void applyTransform(Image image) throws IOException
   {
      ImageTransform transform = null;
      Class transformClass = null;
      try
      {
         transformClass = Class.forName(getImplementation());
         transform = (ImageTransform) transformClass.newInstance();
      }
      catch (Exception e)
      {
         throw new IllegalArgumentException("Cannot instanciate class: " + getImplementation(), e);
      }

      transform.applyTransform(image);

   }

   public abstract String getImplementation();

   public abstract void setImplementation(String implementation);

}


To be able to pass paramaters one could use the f:param tag:
<s:graphicImage ...>
   <s:genericTransformImage implementation="org.foo.bar.MyTransform">
     <f:param name="myParam" value="#{myBean.someValue}"/>
  </s:genericTransformImage>
</s:graphicImage>

What would then be the easiest way to pass those values to the delegate?
1) By reflection on the delegate? 
2) Resolve the values and put them in a <String,Object> map and pass along with the applyTransform?
3) Other suggestions?


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