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## org.richfaces.event
Class MethodExpressionEventListener

    java.lang.Object
      org.richfaces.event.MethodExpressionEventListener

All Implemented Interfaces:
  EventListener, javax.faces.component.StateHolder, javax.faces.event.FacesListener

Direct Known Subclasses:
  FileUploadHandler.FileUploadListenerImpl, MethodExpressionItemChangeListener, MethodExpressionPanelToggleListener, MethodExpressionTreeSelectionChangeListener, MethodExpressionTreeToggleListener

    public abstract class MethodExpressionEventListener

extends Object
implements javax.faces.event.FacesListener, javax.faces.component.StateHolder

MethodExpressionEventListener is a `FacesListener` that wraps a `MethodExpression`. When it receives a `FacesEvent`, it executes a method on an object identified by the `MethodExpression`.

Version:
  1.0
Author:
  akolonitsky

Constructor Summary
`protected` | `MethodExpressionEventListener()`
`protected` | `MethodExpressionEventListener(javax.el.MethodExpression methodExpressionOneArg)` Construct a `FacesListener` that contains a `MethodExpression` .To accomodate method expression targets that take no arguments instead of taking a `FacesEvent` argument, the implementation of this class must take the argument `methodExpressionOneArg`, extract its expression string, and create another `MethodExpression` whose expected param types match those of a zero argument method.
`protected` | `MethodExpressionEventListener(javax.el.MethodExpression methodExprOneArg, javax.el.MethodExpression methodExprZeroArg)` Construct a `FacesListener` that contains a `MethodExpression`.

Method Summary
`boolean` | `isTransient()`
`void` | `processEvent(javax.faces.event.FacesEvent event)` Call through to the `MethodExpression` passed in our constructor.
`void` | `restoreState(javax.faces.context.FacesContext context, Object state)` Both `MethodExpression` instances described in the constructor must be restored.
`Object` | `saveState(javax.faces.context.FacesContext context)` Both `MethodExpression` instances described in the constructor must be saved.
`void` | `setTransient(boolean newTransientValue)`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### MethodExpressionEventListener

    protected MethodExpressionEventListener()

### MethodExpressionEventListener

    protected MethodExpressionEventListener(javax.el.MethodExpression methodExpressionOneArg)

  Construct a `FacesListener` that contains a `MethodExpression` .To accomodate method expression targets that take no arguments instead of taking a `FacesEvent` argument, the implementation of this class must take the argument `methodExpressionOneArg`, extract its expression string, and create another `MethodExpression` whose expected param types match those of a zero argument method. The usage requirements for both of these `MethodExpression` instances are described in `processEvent(javax.faces.event.FacesEvent)`.

  Parameters:
    `methodExpressionOneArg` - a `MethodExpression` that points to a method that returns `void` and takes a single argument of type `FacesEvent`.

### MethodExpressionEventListener

    protected MethodExpressionEventListener(javax.el.MethodExpression methodExprOneArg,
                                            javax.el.MethodExpression methodExprZeroArg)

  Construct a `FacesListener` that contains a `MethodExpression`.

  Parameters:
    `methodExprOneArg` -
    `methodExprZeroArg` -

Method Detail

### processEvent

    public void processEvent(javax.faces.event.FacesEvent event)
                      throws javax.faces.event.AbortProcessingException

  Call through to the `MethodExpression` passed in our constructor. First, try to invoke the `MethodExpression` passed to the constructor of this instance, passing the argument `FacesEvent` as the argument. If a `MethodNotFoundException` is thrown, call to the zero argument `MethodExpression` derived from the `MethodExpression` passed to the constructor of this instance. If that fails for any reason, throw an `AbortProcessingException`, including the cause of the failure.

  Throws:
    `NullPointerException`
    `javax.faces.event.AbortProcessingException`

### saveState

    public Object saveState(javax.faces.context.FacesContext context)

  Both `MethodExpression` instances described in the constructor must be saved.

  Specified by:
    `saveState` in interface `javax.faces.component.StateHolder`

### restoreState

    public void restoreState(javax.faces.context.FacesContext context,
                             Object state)

  Both `MethodExpression` instances described in the constructor must be restored.

  Specified by:
    `restoreState` in interface `javax.faces.component.StateHolder`

### isTransient

    public boolean isTransient()

  Specified by:
    `isTransient` in interface `javax.faces.component.StateHolder`

### setTransient

    public void setTransient(boolean newTransientValue)

  Specified by:
    `setTransient` in interface `javax.faces.component.StateHolder`

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