How to programmatically instantiate a composite component or a tag component ?

["l.penet@senat.fr" <l....@senat.fr>]

Dear all,

how can I programatically instantiate a composite component or a tag 
component from a custom component ?

I proceed this way to instantiate a composite component, but I do not 
really like it as I use reflection to hijack 
FaceletViewDeclarationLanguage methods...

public UIComponent instantiateComposite(String namespace, String 
componentName) {
     FacesContext ctx = FacesContext.getCurrentInstance();
     Resource resource = 
ctx.getApplication().getResourceHandler().createResource( componentName 
+ ".xhtml", namespace );
     UIComponent cc = ctx.getApplication().createComponent( ctx, resource );
     UIPanel panel = (UIPanel) ctx.getApplication().createComponent( 
UIPanel.COMPONENT_TYPE );

     // set the facelet's parent
     cc.getFacets().put( UIComponent.COMPOSITE_FACET_NAME, panel );

     FaceletFactory ff = (DefaultFaceletFactory) 
DefaultFaceletFactory.getInstance();
     if(ff == null) {
         FaceletViewDeclarationLanguage vdl = new 
FaceletViewDeclarationLanguage(ctx);

         Method createCompiler = null;
         Method createFaceletFactory = null;
         try {
             createCompiler = 
FaceletViewDeclarationLanguage.class.getDeclaredMethod("createCompiler",FacesContext.class);
             createFaceletFactory = 
FaceletViewDeclarationLanguage.class.getDeclaredMethod("createFaceletFactory",FacesContext.class,org.apache.myfaces.view.facelets.compiler.Compiler.class);
             createCompiler.setAccessible(true);
             createFaceletFactory.setAccessible(true);
             org.apache.myfaces.view.facelets.compiler.Compiler compiler 
= (org.apache.myfaces.view.facelets.compiler.Compiler) 
createCompiler.invoke(vdl, ctx);
             ff = (FaceletFactory) createFaceletFactory.invoke(vdl, ctx, 
compiler);
         } catch (IllegalAccessException ex) {
Logger.getLogger(SenatDataTableEntryDetail.class.getName()).log(Level.SEVERE, 
null, ex);
         } catch (IllegalArgumentException ex) {
Logger.getLogger(SenatDataTableEntryDetail.class.getName()).log(Level.SEVERE, 
null, ex);
         } catch (InvocationTargetException ex) {
Logger.getLogger(SenatDataTableEntryDetail.class.getName()).log(Level.SEVERE, 
null, ex);
         } catch (NoSuchMethodException ex) {
Logger.getLogger(SenatDataTableEntryDetail.class.getName()).log(Level.SEVERE, 
null, ex);
         } catch (SecurityException ex) {
Logger.getLogger(SenatDataTableEntryDetail.class.getName()).log(Level.SEVERE, 
null, ex);
         }
     }

     try {
         Facelet facelet = ff.getFacelet(resource.getURL());
         facelet.apply( ctx, panel );
     } catch ( IOException e ) {
         e.printStackTrace();
     }
     return cc;
}

How can I do the same stuff in a cleanier way ?

And how can I instantiate a tag component  I mean a component declared 
the following way :

<tag>
     <description>blah blah</description>
     <tag-name>myWonderfulTag</tag-name>
     <source>tags/mwl/myWonderfulTag.xhtml</source>
<!-- attributes -->
</tag>

in a taglib.

Thanks in advance,

Ludovic
PS : question also asked on stackoverflow : 
http://stackoverflow.com/questions/15813582/how-to-programmatically-instantiate-a-composite-component-or-a-tag-component


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