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