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Posted to dev@myfaces.apache.org by "Anonymous (JIRA)" <de...@myfaces.apache.org> on 2006/03/07 16:45:39 UTC
[jira] Updated: (MYFACES-334) aliasbean and alias usage in binding
[ http://issues.apache.org/jira/browse/MYFACES-334?page=all ]
updated MYFACES-334:
---------------------
> aliasbean and alias usage in binding
> ------------------------------------
>
> Key: MYFACES-334
> URL: http://issues.apache.org/jira/browse/MYFACES-334
> Project: MyFaces Core
> Type: Bug
> Versions: 1.0.9m9
> Reporter: Mario Ivankovits
> Assignee: Martin Marinschek
>
> Myfaces fails to restore a view it it uses aliases in bindings.
> Our jsf looks like this (for sure, we use include for the dataTable):
> <x:aliasBeansScope>
> <x:aliasBean alias="#{coTopicEdit}" value="#{coAddressEdit}" />
> <h:dataTable var="topic" value="#{coTopicEdit.topics}"
> binding="#{coTopicEdit.genericTopicTable}" >
> ....
> </h:dataTable>
> <h:commandLink value="xx"/>
> </x:aliasBeansScope>
> The page renders correctly for the first time, but if you press the commandLink myfaces fails in the restoreView phase.
> The reason is simple:
> During LifecycleImpl.restoreView myfaces tries to attach each component to the backing bean (in recursivelyHandleComponentReferencesAndSetValid - "binding.setValue").
> Now if it comes to the binding of the dataTable the alias bean havent had the chance to reassign its alias and thus the ValueBinding for "#{coTopicEdit.genericTopicTable}" fails.
> To workaround it I create my own ViewHandler (code follows).
> I hooked into restoreView - process the view recursivley and call "makeAlias" on each alias bean using reflection (the method is package private).
> This IS a hack and (I think) it breaks the scope of the alias , but for now I am happy with it.
> Any ideas how to solve it correctly?
> And now the code in case someone else needs it too:
> public UIViewRoot restoreView(FacesContext facesContext, String viewId)
> {
> UIViewRoot root = super.restoreView(facesContext, viewId);
> if (root != null)
> {
> processAliases(facesContext, root);
> }
> return root;
> }
> protected void processAliases(FacesContext context, UIComponent root)
> {
> if (root == null)
> {
> return;
> }
> for (Iterator it = root.getFacetsAndChildren(); it.hasNext(); )
> {
> UIComponent component = (UIComponent)it.next();
> if (component instanceof AliasBean)
> {
> AliasBean alias = (AliasBean) component;
> try
> {
> Method makeAliasMethod = alias.getClass().getDeclaredMethod("makeAlias", FacesContext.class);
> makeAliasMethod.setAccessible(true);
> makeAliasMethod.invoke(alias, context);
> }
> catch (NoSuchMethodException e)
> {
> log.warn(e.getLocalizedMessage(), e);
> }
> catch (IllegalAccessException e)
> {
> log.warn(e.getLocalizedMessage(), e);
> }
> catch (InvocationTargetException e)
> {
> log.warn(e.getLocalizedMessage(), e);
> }
> }
> processAliases(context, component);
> }
> }
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