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https://issues.jboss.org/browse/SEAMFACES-109?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12589149#comment-12589149
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Dan Allen commented on SEAMFACES-109:
-------------------------------------
Other names for the class might be ViewMetadataAnalyzer, ViewMetadataProcessor
or ViewMetadataScanner
If you wanted to take this a step further, you could build a generic query API
for retrieving components from the UIComponent tree. In that case, you might
break it down into the following concerns:
UIComponentQueryProcessor
execute(UIComponentQuery query, UIComponent searchRoot)
ViewMetadataQueryProcessor extends UIComponentQueryProcessor
execute(UIComponentQuery query)
UIComponentQuery
matches(UIComponent)
descend(UIComponent)
Just an idea ;)
> Provide a query API to retrieve components from view metadata
> -------------------------------------------------------------
>
> Key: SEAMFACES-109
> URL: https://issues.jboss.org/browse/SEAMFACES-109
> Project: Seam Faces
> Issue Type: Feature Request
> Components: UI Components
> Affects Versions: 3.0.0.CR1
> Reporter: Dan Allen
> Priority: Minor
>
> The ViewMetadata API only provides a method for retrieving the collection of
> UIViewParameter components. However, this facet can be used for many other
> components, such as view actions, view restrictions and so forth. Seam Faces
> should provide a convenient query API for retrieving any type of component.
> Here is a proposal:
> {code:java}
> public class ViewMetadataQuery {
> public <C extends UIComponent> Collection<C>
> findMetadataComponents(UIViewRoot viewRoot,
> UIComponentFilter<C> componentFilter) {
> UIComponent metadataFacet =
> viewRoot.getFacet(UIViewRoot.METADATA_FACET_NAME);
>
> if (metadataFacet == null) {
> return Collections.<C>emptyList();
> }
>
> Collection<C> matches = new ArrayList<C>();
> for (UIComponent candidate : metadataFacet.getChildren()) {
> if (componentFilter.accepts(candidate)) {
> matches.add((C) candidate);
> }
> }
>
> return matches;
> }
> }
>
> public class UIComponentFilter<C extends UIComponent> {
> public abstract boolean accepts(UIComponent candidate);
> }
> {code}
> It would be used as follows:
> {code:java}
> @Inject
> private ViewMetadataQuery query;
> ...
> Collection<UIViewAction> viewActions = query.findMetadataComponents(viewRoot,
> new UIComponentFilter<UIViewAction>() {
> public boolean accepts(UIComponent candidate) {
> return candidate instanceof UIViewAction;
> }
> });
> {code}
> You can simplify this further by providing a version of the method that
> accepts a type:
> {code:java}
> Collection<UIViewAction> viewActions = query.findMetadataComponents(viewRoot,
> UIViewAction.class);
> {code}
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