Hello
there! Today let’s see the top commonly used ADF snippets (at least that’s what I thought while starting to share it) so here you go with the entries.
1. Getting
the page bindings
This
is commonly used to get the page bindings in the managed bean to get either
specific binding values or get a hold on the action for the binding.
1: public static BindingContainer getBindingContainer() {
2: FacesContext facesContext = FacesContext.getCurrentInstance();
3: Application app = facesContext.getApplication();
4: ExpressionFactory elFactory = app.getExpressionFactory();
5: ELContext elContext = facesContext.getELContext();
6: ValueExpression valueExp = elFactory.createValueExpression(elContext, "#{bindings}", Object.class);
7: return (BindingContainer)valueExp.getValue(elContext);
8: }
2.
Getting
hold off the Application Module
Application
modules are required to do any sort of tasks binding the view object and the
view links and all wrapped around by services. So needless to say that whenever
there is a need to call your service getting to your AM is your first step.
1: public static ApplicationModule getApplicationModuleForDataControl(String name) {
2: BindingContext bindingContext = BindingContext.getCurrent();
3: ApplicationModule appModule = null;
4: if (null != bindingContext) {
5: DCDataControl dc = bindingContext.findDataControl(name);
6: if (dc != null) {
7: appModule = (ApplicationModule)dc.getDataProvider();
8: }
9: }
10: return appModule;
11: }
3.
Resource
Bundle Properties
There
are scenarios where we want to get the property values from the resource bundle
in our beans and this happens more often than you think!
1: public static String getResourceProperty(String label, Locale userLocale) {
2: String bundle_name = "com.example.mybundle";
3: String txt = null;
4: try {
5: ResourceBundle bundle = BundleFactory.getBundle(bundle_name, userLocale);
6: if (bundle != null) {
7: txt = bundle.getString(label);
8: }
9: } catch (Exception e) {
10: logger.severe("Problem in loading resource bundle: " + bundle_name, e.getMessage());
11: }
12: return txt;
13: }
4.
Is
the request a PPR?
Ever
wondered if a request is a normal full request or a partial page request, well
the following snippet gives you that information. This is a very useful thing
to know when you try to filter out requests in your listeners.
1: public static boolean isPprRequest() {
2: FacesContext facesContext = FacesContext.getCurrentInstance();
3: return AdfFacesContext.getCurrentInstance().isPartialRequest(facesContext);
4: }
5.
Retrieving
the request headers from within managed bean
We can get the request headers from the bean using the following snippet
1: FacesContext facesContext = FacesContext.getCurrentInstance();
2: ExternalContext externalContext = facesContext.getExternalContext();
3: Map requestHeaderMap = externalContext.getRequestHeaderMap();
6.
Accessing
request and response objects from a bean
1: FacesContext facesContext = FacesContext.getCurrentInstance();
2: ExternalContext externalContext = facesContext.getExternalContext();
3: HttpServletResponse response = (HttpServletResponse)externalContext.getResponse();
4: HttpServletRequest request = (HttpServletRequest)facesContext.getExternalContext().getRequest();
7.
Putting
and retrieving from session scope
Quick ways to manage objects in session scope.
1: ADFContext.getCurrent().getSessionScope().put("abc", abcValue);
2: ADFContext.getCurrent().getSessionScope().remove("abc");
3: ADFContext.getCurrent().getSessionScope().get("abc");
8.
Adding
partial targets at runtime
We could add partial targets to components at runtime so that the property changes made in a bean method to a previously non target component reflects in UI.
1: AdfFacesContext.getCurrentInstance().addPartialTarget(myComponent);
9.
Adding
JavaScript to response
More often than not we might be required to trigger some external Javascript on click of a button. To achieve it we use the following code.
1: public static void addScriptOnPartialRequest(String script) {
2: logger.fine("Adding Java Script " + script);
3: FacesContext context = FacesContext.getCurrentInstance();
4: if (AdfFacesContext.getCurrentInstance().isPartialRequest(context)) {
5: ExtendedRenderKitService erks = Service.getRenderKitService(context, ExtendedRenderKitService.class);
6: erks.addScript(context, script);
7: }
8: }
10.
Get
the current Locale
Snippet to get the current locale
1: public static Locale getLocale() {
2: ADFContext adfctx = ADFContext.getCurrent();
3: return adfctx.getLocale();
4: }
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