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RememberMeLoginComponent: Properties
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The RememberMeLoginComponent extends FormBasedLoginComponent primarily to inherit its usernameLabel, passwordLabel, buttonLabel, and resetButtonLabel JavaBeans string properties In addition, this component adds a rememberMeCheckboxLabel String property, the usernameComponent and passwordComponent JavaBeans UIInput properties, and the String buttonAction JavaBeans property During encoding, this component will check for the existence of a specific cookie in the request The cookie will only be present if the user checked the remember me checkbox on a previous visit to the site If present, the cookie is examined and the user ID and password are extracted from it and set as the value of the userid and password components in the tree This approach is straightforward and works well in JSF 11 and 12
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RememberMeLoginTag
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For every component property configurable by the page author, there must be a corresponding JavaBeans property in the custom JSP tag for that component As described in 10, there are two parts to satisfy this requirement: A write only, or read/write JavaBeans property of the correct type, as specified in the TLD for the tag Some action in the setProperties( ) method that conveys the value of that property as provided by the page author to the actual UIComponent instance that sits behind the tag Both of these parts were described in 10, but we re reviewing the second part because this is the most important method of a JSP custom tag for a JSF component The action of this method is no different than that taken in the custom components in 10
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package comjsfcompreftrainercomponentstaglib; import import import import import import import import import import comjsfcompreftrainercomponentscomponentRememberMeLoginComponent; comjsfcompreftrainercomponentsutilConstantMethodBinding; javaxfacesFacesException; javaxfacesapplicationApplication; javaxfacescomponentUIComponent; javaxfacescomponentUIInput; javaxfacescontextFacesContext; javaxfaceselMethodBinding; javaxfaceselValueBinding; javaxfaceselReferenceSyntaxException;
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public class RememberMeLoginTag extends FormBasedLoginTag { // protected void setProperties(UIComponent component) { supersetProperties(component); RememberMeLoginComponent comp = (RememberMeLoginComponent) component; FacesContext context = getFacesContext(); Application application = contextgetApplication(); ValueBinding vb = null; MethodBinding md = null; String action = thisgetButtonAction(); if (null != rememberMeLabel) { // if this is an expression if (isValueReference(rememberMeLabel)) { try { vb = applicationcreateValueBinding(rememberMeLabel); compsetValueBinding("rememberMeLabel", vb); } catch (ReferenceSyntaxException rse) { // log exception } } else {
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compsetRememberMeLabel(rememberMeLabel); } } // Hook up the bindings try { vb = applicationcreateValueBinding(getUsernameBinding()); compsetUsernameComponent((UIInput) application createComponent(vb, context, "javaxfacesHtmlInputText")); vb = applicationcreateValueBinding(getPasswordBinding()); compsetPasswordComponent((UIInput) application createComponent(vb, context, "javaxfacesHtmlInputSecret")); if (isValueReference(action)) { MethodBinding mb = FacesContextgetCurrentInstance() getApplication()createMethodBinding(action, null); compgetLoginButtonComponent()setAction(mb); } else { compgetLoginButtonComponent() setAction(new ConstantMethodBinding(action)); }
PART III
} catch (Exception e) { throw new FacesException(e); } }
The first thing a custom setProperties( ) method must do is call supersetProperties( ), passing the same UIComponent argument passed to this instance Not doing this will probably cause your custom component to break In this case, the super call processes the attributes inherited from FormBasedLoginComponent It then does exactly the same thing with the rememberMeLabel property After the simple properties are propagated to the RememberMeLoginComponent, the usernameBinding, passwordBinding, and buttonAction properties are dealt with These last three properties are listed as required in the TLD entry for the tag, so the JSP page will not compile unless the page author provides values for these The first two properties are ValueBinding properties whose type is UIComponent, also known as a component binding The user must provide a valid value expression as the value of these two attributes, and the type of that expression must be UIComponent Note that ApplicationcreateComponent( ) is called from inside the argument to the setter of the usernameComponent, and passwordComponent properties, passing the ValueBinding as an argument to createComponent( ) createComponent( ) takes the argument ValueBinding and component type and instantiates a component of the given type and sets its value into the ValueBinding by calling its setValue( ) method In the Virtual Trainer, this causes the setUserid( ) and setPassword( ) methods of the Authentication_Backing managed bean to be called This step is crucial because it establishes the link between the RememberMeLoginComponent and the Virtual Trainer s existing login mechanism The final tag property, buttonAction, is a MethodBinding expression or literal string that is passed on to the action property of the UICommand component representing the login button in the panel As such, the JSP tag must examine the value of the buttonAction property to see if it is an expression If so, a MethodBinding is created for the expression using the
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