JSF 2.2 - Creating a Custom TagHandlerDelegate Skeleton

In order to write and configure a TagHandlerDelegate, you have to accomplish three steps:

·         extract the TagHandlerDelegate and override its methods

public class CustomTagHandlerDelegate extends TagHandlerDelegate {

 private TagHandlerDelegate tagHandlerDelegate;

 public CustomTagHandlerDelegate() {

 }

 public CustomTagHandlerDelegate(TagHandlerDelegate tagHandlerDelegate) {

  this.tagHandlerDelegate = tagHandlerDelegate;

 }

 @Override

 public MetaRuleset createMetaRuleset(Class type) {

  return tagHandlerDelegate.createMetaRuleset(type);

 }

 @Override

 public void apply(FaceletContext ctx, UIComponent comp) throws IOException {

  tagHandlerDelegate.apply(ctx, comp);

 }

}

·         Extend the TagHandlerDelegateFactory and point your TagHandlerDelegate

public class CustomTagHandlerDelegateFactory extends TagHandlerDelegateFactory {

  

    private TagHandlerDelegateFactory tagHandlerDelegateFactory;

    public CustomTagHandlerDelegateFactory() {

    }

    public CustomTagHandlerDelegateFactory(TagHandlerDelegateFactory tagHandlerDelegateFactory) {

        this.tagHandlerDelegateFactory = tagHandlerDelegateFactory;

    }

    @Override

    public TagHandlerDelegate createComponentHandlerDelegate(ComponentHandler owner) {       

        return new CustomTagHandlerDelegate(tagHandlerDelegateFactory.createComponentHandlerDelegate(owner));

    }

    @Override

    public TagHandlerDelegate createValidatorHandlerDelegate(ValidatorHandler owner) {      

        return tagHandlerDelegateFactory.createValidatorHandlerDelegate(owner);

    }

    @Override

    public TagHandlerDelegate createConverterHandlerDelegate(ConverterHandler owner) {     

        return tagHandlerDelegateFactory.createConverterHandlerDelegate(owner);

    }

    @Override

    public TagHandlerDelegate createBehaviorHandlerDelegate(BehaviorHandler owner) {      

        return tagHandlerDelegateFactory.createBehaviorHandlerDelegate(owner);

    }

}

·         configure the your custom TagHandlerDelegateFactory in faces-config.xml

<factory>

 <tag-handler-delegate-factory>

  your_custom_taghandlerdelegatefactory_package.CustomTagHandlerDelegateFactory

 </tag-handler-delegate-factory>

</factory>

Now, most probably, you will go in the apply() method and "play" with the component tree, during its construction.