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duminică, 3 iulie 2016

[OmniFaces utilities (2.4)] Get a list of all action expressions and listeners associated with given component


[OmniFaces utilities] The getActionExpressionsAndListeners() method returns a list of all action expressions and listeners associated with given component. This covers expressions in action attribute of command components and listener attribute of ajax components. Any method expressions are in format #{bean.method} and any action listeners are added as fully qualified class names. This list is primarily useful for logging postback actions in a phase listener. You can use #getCurrentActionSource() to obtain the current action source.

Method:

Usage:

Let's suppose the following code:

<h:form>
 <h:commandButton value="Foo" actionListener="#{fooBean.fooActionListener()}" action="#{fooBean.fooAction()}">
  <f:setPropertyActionListener id="foo" target="#{fooBean.foo}" value="Foo"/>                              
  <f:ajax execute="@form" render="@form" listener="#{fooBean.ajaxFooListener()}"/>
 </h:commandButton>
</h:form>

Now, programmatically (for example in a phase listener) we can do this:

import org.omnifaces.util.Components;
...
// use getCurrentActionSource() to get the source of the currently invoked action
UIComponent command = Components.getCurrentActionSource();
List<String> ael = Components.getActionExpressionsAndListeners(command);

// or, use getCurrentCommand() to get the currently invoked UI command component
UIComponent command = Components.getCurrentCommand();
List<String> ael = Components.getActionExpressionsAndListeners(command);

Both examples will return a List<String>  that contains the following items:

[
 #{fooBean.fooAction()},
 javax.faces.event.MethodExpressionActionListener,  
 com.sun.faces.facelets.tag.jsf.core.SetPropertyActionListenerHandler$SetPropertyListener,
 #{fooBean.ajaxFooListener()}
]

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