Hello,
sorry bothering you again.
I don´t fully understand this pattern.
What I did so far is creating a ComponentBindings-POJO
| @Name("componentBindings")
| @Scope(ScopeType.EVENT)
| public class ComponentBindings {
| @Logger
| Log log;
|
| HtmlPanelGrid selectedItemPreview;
| HtmlPanelGrid selectedItemEditor;
|
| @Create
| public void init() {
| log.debug(LogFormat.INSTANCE.format(LogFormat.L_INSTANCE,
ComponentBindings.class.getSimpleName()));
| }
|
| public HtmlPanelGrid getSelectedItemEditor() {
| return selectedItemEditor;
| }
| public void setSelectedItemEditor(HtmlPanelGrid selectedItemEditor) {
| this.selectedItemEditor = selectedItemEditor;
| }
|
| public HtmlPanelGrid getSelectedItemPreview() {
| return selectedItemPreview;
| }
| public void setSelectedItemPreview(HtmlPanelGrid selectedItemPreview) {
| this.selectedItemPreview = selectedItemPreview;
| }
| }
|
My backing bean looks now like this:
| @Stateful
| @Name("selectItemFacade")
| @Scope(ScopeType.CONVERSATION)
| public class SelectItemFacadeBean implements SelectItemFacade {
|
| @Logger
| Log log;
|
| // Bijection
| @Out
| ItemDescription selectedItemType;
| @Out(required=false)
| Item item;
|
| // Instance
| @In(create=true)
| ComponentBindings componentBindings;
|
| @Create @Begin()
| public void init() {
|
this.componentBindings.setSelectedItemPreview((HtmlPanelGrid)FacesContext.getCurrentInstance().getApplication().createComponent(HtmlPanelGrid.COMPONENT_TYPE));
| this.selectedItemType =
ItemRegistry.INSTANCE.getDefaultItemDescription();
| updateSelectedItemComponents();
| }
|
| private void updateSelectedItemComponents() {
| if (this.selectedItemType != null &&
this.componentBindings.getSelectedItemPreview() != null) {
|
selectedItemType.getPreviewComponent(FacesContext.getCurrentInstance(),
this.componentBindings.getSelectedItemPreview(), this.item);
| }
| }
|
| public Item getItem() {
| return item;
| }
|
| public void setItem(Item item) {
| this.item = item;
| }
|
| public SelectItem[] getAvailableItemTypes() {
| return ItemRegistry.INSTANCE.getAvailableTypesAsSelectItem();
| }
|
| public ItemDescription getSelectedItemType() {
| return selectedItemType;
| }
|
| public void setSelectedItemType(ItemDescription selectedItemType) {
| this.selectedItemType = selectedItemType;
| }
|
| public ComponentBindings getComponentBindings() {
| return componentBindings;
| }
|
| public void setComponentBindings(ComponentBindings bindings) {
| this.componentBindings = bindings;
| }
|
| // Actions
| @Begin(join=true)
| public void handleItemTypeChange(ValueChangeEvent evt) {
| ItemDescription desc =
ItemRegistry.INSTANCE.getDescription((String)evt.getNewValue());
| if (desc != null) {
| this.selectedItemType = desc;
| updateSelectedItemComponents();
| log.debug("Item type changed to " +
this.selectedItemType.getLabel());
| }
| }
|
| @Begin(join=true)
| public String edit() {
| log.debug("Action: edit called;");
|
| if (this.selectedItemType != null && this.item == null) {
| log.debug("Creating " + selectedItemType.getLabel() +
" and getting edit Component;");
| this.item = selectedItemType.createItemInstance();
| }
|
| return NavCodes.ACTION_EDIT;
| }
|
| @Destroy @Remove
| public void destroy() { }
|
| }
|
My Page looks now like this:
| <ui:define name="body">
|
| <h:messages globalOnly="true" styleClass="message" />
| <h:form id="panel" >
| <h:panelGrid columns="1">
|
| <h:panelGroup>
| <h:selectOneMenu
valueChangeListener="#{selectItemFacade.handleItemTypeChange}"
onchange="submit()">
| <f:selectItems
value="#{selectItemFacade.availableItemTypes}" />
| </h:selectOneMenu>
| </h:panelGroup>
|
| <h:panelGroup>
| <h:panelGrid
binding="#{selectItemFacade.componentBindings.selectedItemPreview}" />
| </h:panelGroup>
|
| <h:panelGroup>
| <h:commandButton id="edit_button"
action="#{selectItemFacade.edit}" />
| </h:panelGroup>
|
| </h:panelGrid>
| </h:form>
|
| </ui:define>
|
But after pushing the edit-button I still get the following exception:
| javax.faces.el.PropertyNotFoundException: /item/select.xhtml @23,89
binding="#{selectItemFacade.componentBindings.selectedItemPreview}": Target
Unreachable, identifier 'selectItemFacade' resolved to null
|
I got redirected to the seam debug page. The conversation context contains then:
| - Conversation Context (1)
| org.jboss.seam.core.conversation
| org.jboss.seam.core.facesMessages
| org.jboss.seam.core.persistenceContexts
| org.jboss.seam.core.redirect
| org.jboss.seam.debug.lastException
| selectItemFacade
| selectedItemType
|
Can anybody help?
Thank you.
---
Joachim
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