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package javax.faces.event;
import javax.el.
ELContext;
import javax.el.
ELException;
import javax.el.
MethodExpression;
import javax.faces.context.
FacesContext;
import javax.faces.component.
StateHolder;
import java.util.logging.
Logger;
import javax.el.
MethodNotFoundException;
/**
* <p><strong><span class="changed_modified_2_0
* changed_modified_2_0_rev_a
* changed_modified_2_2">MethodExpressionActionListener</span></strong>
* is an {@link ActionListener} that wraps a {@link
* MethodExpression}. When it receives a {@link ActionEvent}, it
* executes a method on an object identified by the {@link
* MethodExpression}.</p>
*/
public class
MethodExpressionActionListener implements
ActionListener,
StateHolder {
private static final
Logger LOGGER =
Logger.
getLogger("javax.faces.event", "javax.faces.LogStrings");
// ------------------------------------------------------ Instance Variables
private
MethodExpression methodExpressionOneArg = null;
private
MethodExpression methodExpressionZeroArg = null;
private boolean
isTransient;
private final static
Class[]
ACTION_LISTENER_ZEROARG_SIG = new
Class[] { };
public
MethodExpressionActionListener() { }
/**
* <p><span class="changed_modified_2_0">Construct<span
* class="changed_modified_2_0"> a {@link ValueChangeListener} that
* contains a {@link MethodExpression}. <span
* class="changed_added_2_0">To accomodate method expression targets
* that take no arguments instead of taking an {@link ActionEvent}
* argument</span>, the implementation of this class must take the
* argument <code>methodExpressionOneArg</code>, extract its
* expression string, and create another
* <code>MethodExpression</code> whose expected param types match
* those of a zero argument method. The usage requirements for both
* of these <code>MethodExpression</code> instances are described in
* {@link #processAction}.</span></p>
*
* @param methodExpressionOneArg a <code>MethodExpression</code>
* that points to a method that returns <code>void</code> and takes
* a single argument of type {@link ActionEvent}.
*/
public
MethodExpressionActionListener(
MethodExpression methodExpressionOneArg) {
super();
this.
methodExpressionOneArg =
methodExpressionOneArg;
FacesContext context =
FacesContext.
getCurrentInstance();
ELContext elContext =
context.
getELContext();
this.
methodExpressionZeroArg =
context.
getApplication().
getExpressionFactory().
createMethodExpression(
elContext,
methodExpressionOneArg.
getExpressionString(),
Void.class,
ACTION_LISTENER_ZEROARG_SIG);
}
public
MethodExpressionActionListener(
MethodExpression methodExpressionOneArg,
MethodExpression methodExpressionZeroArg) {
super();
this.
methodExpressionOneArg =
methodExpressionOneArg;
this.
methodExpressionZeroArg =
methodExpressionZeroArg;
}
// ------------------------------------------------------- Event Method
/**
* <p><span class="changed_modified_2_0
* changed_modified_2_2">Call</span> through to the {@link
* MethodExpression} passed in our constructor. <span
* class="changed_added_2_0">First, try to invoke the
* <code>MethodExpression</code> passed to the constructor of this
* instance, passing the argument {@link ActionEvent} as the
* argument. If a {@link MethodNotFoundException} is thrown, call
* to the zero argument <code>MethodExpression</code> derived from
* the <code>MethodExpression</code> passed to the constructor of
* this instance. <span class="changed_deleted_2_2"><del>If that
* fails for any reason, throw an {@link AbortProcessingException},
* including the cause of the failure.</del></span></span></p>
*
* @throws NullPointerException {@inheritDoc}
* @throws AbortProcessingException {@inheritDoc}
*/
public void
processAction(
ActionEvent actionEvent) throws
AbortProcessingException {
if (
actionEvent == null) {
throw new
NullPointerException();
}
FacesContext context =
FacesContext.
getCurrentInstance();
ELContext elContext =
context.
getELContext();
try {
try {
methodExpressionOneArg.
invoke(
elContext, new
Object[] {
actionEvent});
} catch (
MethodNotFoundException mnfe) {
methodExpressionZeroArg.
invoke(
elContext, new
Object[]{});
}
} catch (
ELException ee) {
if (
ee.
getCause() instanceof
AbortProcessingException) {
throw (
AbortProcessingException)
ee.
getCause();
} else {
throw (
ELException)
ee;
}
}
}
// ------------------------------------------------ Methods from StateHolder
/**
* <p class="changed_modified_2_0">Both {@link MethodExpression}
* instances described in the constructor must be saved.</p>
*/
public
Object saveState(
FacesContext context) {
if (
context == null) {
throw new
NullPointerException();
}
return new
Object[] {
methodExpressionOneArg,
methodExpressionZeroArg };
}
/**
* <p class="changed_modified_2_0">Both {@link MethodExpression}
* instances described in the constructor must be restored.</p>
*/
public void
restoreState(
FacesContext context,
Object state) {
if (
context == null) {
throw new
NullPointerException();
}
if (
state == null) {
return;
}
methodExpressionOneArg = (
MethodExpression) ((
Object[])
state)[0];
methodExpressionZeroArg = (
MethodExpression) ((
Object[])
state)[1];
}
public boolean
isTransient() {
return
isTransient;
}
public void
setTransient(boolean
newTransientValue) {
isTransient =
newTransientValue;
}
}