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

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  1. POHow to programmatically instantiate a composite component or a tag component?
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    <p>I would like to programmatically instantiate composite or tag components.</p> <p>This instantiation would be performed by a custom component, typically adding those composite or tag components as children.</p> <p>The best answer I found when crawling forums is : <a href="http://www.java.net/node/701640#comment-791881" rel="nofollow noreferrer">http://www.java.net/node/701640#comment-791881</a> . It looks a lot like another answer I found on this forum : <a href="https://stackoverflow.com/questions/5370184/how-to-programmatically-or-dynamically-create-a-composite-component-in-jsf-2">How to programmatically or dynamically create a composite component in JSF 2</a> .</p> <p>While working on this question, I finally wrote code that works for <em>composite</em> instanciation using MyFaces (examples in link seems to be Mojarra specific). I copy it there as it took me some time to write it and hope it will help someone else :</p> <pre><code>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; } </code></pre> <p>Please do not pay attention to ugly exception handling : it is just as automatically generated by netbeans... I will ask MyFaces developpers if there is a way to avoid ugly reflection hacks.</p> <p>How can I do the same with tag components , I mean components declared like :</p> <pre><code>&lt;tag&gt; &lt;description&gt;blah blah&lt;/description&gt; &lt;tag-name&gt;myWonderfulTag&lt;/tag-name&gt; &lt;source&gt;tags/mwl/myWonderfulTag.xhtml&lt;/source&gt; &lt;!-- attributes --&gt; &lt;/tag&gt; </code></pre> <p>in taglib.</p> <p>Thanks in advance.</p>
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