Which Context used at Which Time in Oracle ADF

Some handy code for your managed Beans ( ADF & JSF )

Back in 2009, I already a made a blogpost about some handy code which you can use in your ADF Web Application. You can say this blogspot is part 2 and here I will show you the code, I use most  in my own managed Beans.

I start with FacesContext class, with this class you can use to find a JSF Component, change the Locale, get the ELContext, Add a message to your view and get the ExternalContext

	// FacesContext
	FacesContext facesCtx = FacesContext.getCurrentInstance();
	// find UIComponent
	UIComponent input = facesCtx.getViewRoot().findComponent("f1");
	// change the locale
	facesCtx.getViewRoot().setLocale( Locale.ENGLISH);
	// el expression
	Application app = facesCtx.getApplication();
	ExpressionFactory elFactory = app.getExpressionFactory();
	ELContext elContext = facesCtx.getELContext();
	ValueExpression valueExp = elFactory.createValueExpression(elContext,
	"#{xxxx}",
	Object.class);
	Object result = valueExp.getValue(elContext);
	// add a message
	FacesMessage msg = new FacesMessage(FacesMessage.SEVERITY_WARN,
	"header",
	"detail");
	facesCtx.addMessage(input.getClientId(facesCtx), msg);
	// ExternalContext
	ExternalContext ectx = facesCtx.getExternalContext();

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The ExternalContext class, with this you can retrieve all the java init & context (web.xml) parameters, the Request & Session parameters and your web application url.

	// ExternalContext
	ExternalContext ectx = facesCtx.getExternalContext();
	// all the java init parameters
	Map<String, Object> initParamsVar = ectx.getInitParameterMap();
	Map<String, String> requestParamsVar = ectx.getRequestParameterMap();
	Map<String, Object> sessionParamsVar = ectx.getSessionMap();
	// web application context root
	String contextPath = ectx.getRequestContextPath();

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AdfFacesContext class, you can use this class for Partial Page Rendering ( PPR), get the PageFlowScope and ViewScope variables

	// AdfFacesContext
	AdfFacesContext adfFacesCtx = AdfFacesContext.getCurrentInstance();
	// PPR
	adfFacesCtx.addPartialTarget(input);
	// get the PageFlowScope Params
	Map<String, Object> scopePageFlowScopeVar= adfFacesCtx.getPageFlowScope();
	// get the viewScope Params
	Map<String, Object> scopeViewScopeVar= adfFacesCtx.getViewScope();

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ADFContext class, with this you can get all the memory scopes variables even the application scope variables, ELContext and the SecurityContext.

	// ADFContext
	ADFContext adfCtx = ADFContext.getCurrent();
	// Get the scope variables
	Map<String, Object> applicationVar2 = adfCtx.getApplicationScope();
	Map<String, Object> pageParamsVar2 = adfCtx.getPageFlowScope();
	Map<String, String> requestParamsVar2 = adfCtx.getRequestScope();
	Map<String, Object> sessionParamsVar2 = adfCtx.getSessionScope();
	// el expression
	ELContext elContext2 = adfCtx.getELContext();
	ExpressionFactory elFactory2 = adfCtx.getExpressionFactory();
	ValueExpression valueExp2 = elFactory2.createValueExpression(elContext2,
	"#{xxxx}",
	Object.class);
	Object result2 = valueExp2.getValue(elContext2);
	// Security
	SecurityContext secCntx = adfCtx.getSecurityContext();

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SecurityContext class, retrieve the current user and its roles.

	// Security
	SecurityContext secCntx = adfCtx.getSecurityContext();
	String user = secCntx.getUserName();
	String[] roles = secCntx.getUserRoles();

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BindingContext, BindingContainer and DCBindingContainer class. These classes are well known when you want to retrieve the ADF pagedef objects.

	BindingContext bc = BindingContext.getCurrent();
	BindingContainer bcon = bc.getCurrentBindingsEntry();
	List<AttributeBinding> attr = bcon.getAttributeBindings();
	List<OperationBinding> oper = bcon.getOperationBindings();
	List<ControlBinding> ctrl = bcon.getControlBindings();
	DCBindingContainer dcbcon = (DCBindingContainer) bc.getCurrentBindingsEntry();
	List<AttributeBinding> attr2 = dcbcon.getAttributeBindings();
	List<OperationBinding> oper2 = dcbcon.getOperationBindings();
	List<ControlBinding> ctrl2 = dcbcon.getControlBindings();
	List iters = dcbcon.getIterBindingList();
	List exec = dcbcon.getExecutableBindings();

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The last class is ControllerContext, which you can use to retrieve the exceptions

	ControllerContext cc = ControllerContext.getInstance();
	// get the exception
	Exception exp = cc.getCurrentViewPort().getExceptionData();