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package javax.faces.component;
import javax.faces.validator.
Validator;
import javax.faces.validator.
ValidatorException;
import javax.faces.el.
MethodBinding;
import javax.faces.el.
EvaluationException;
import javax.faces.context.
FacesContext;
/**
* <p><strong>MethodBindingValidator</strong> is an {@link
* ValidatorListener} that wraps a {@link MethodBinding}. When it
* receives a {@link ActionEvent}, it executes a method on an
* object identified by the {@link MethodBinding}.</p>
*/
class
MethodBindingValidator extends
MethodBindingAdapterBase implements
Validator,
StateHolder {
// ------------------------------------------------------ Instance Variables
private
MethodBinding methodBinding = null;
public
MethodBindingValidator() {}
/**
* <p>Construct a {@link Validator} that contains a {@link
* MethodBinding}.</p>
*/
public
MethodBindingValidator(
MethodBinding methodBinding) {
super();
this.
methodBinding =
methodBinding;
}
public
MethodBinding getWrapped() {
return
methodBinding;
}
// ------------------------------------------------------- Validator
public void
validate(
FacesContext context,
UIComponent component,
Object value) throws
ValidatorException {
if (null ==
context || null ==
component) {
throw new
NullPointerException();
}
try {
methodBinding.
invoke(
context, new
Object[] {
context,
component,
value});
}
catch (
EvaluationException ee) {
Throwable cause = this.
getExpectedCause(
ValidatorException.class,
ee);
if (
cause instanceof
ValidatorException) {
throw ((
ValidatorException)
cause);
}
if (
cause instanceof
RuntimeException) {
throw ((
RuntimeException)
cause);
}
throw new
IllegalStateException(
ee);
}
}
//
// Methods from StateHolder
//
public
Object saveState(
FacesContext context) {
if (
context == null) {
throw new
NullPointerException();
}
Object result = null;
if (!
tranzient) {
if (
methodBinding instanceof
StateHolder) {
Object []
stateStruct = new
Object[2];
// save the actual state of our wrapped methodBinding
stateStruct[0] = ((
StateHolder)
methodBinding).
saveState(
context);
// save the class name of the methodBinding impl
stateStruct[1] =
methodBinding.
getClass().
getName();
result =
stateStruct;
}
else {
result =
methodBinding;
}
}
return
result;
}
public void
restoreState(
FacesContext context,
Object state) {
if (
context == null) {
throw new
NullPointerException();
}
// if we have state
if (null ==
state) {
return;
}
if (!(
state instanceof
MethodBinding)) {
Object []
stateStruct = (
Object [])
state;
Object savedState =
stateStruct[0];
String className =
stateStruct[1].
toString();
MethodBinding result = null;
Class toRestoreClass;
if (null !=
className) {
try {
toRestoreClass =
loadClass(
className, this);
}
catch (
ClassNotFoundException e) {
throw new
IllegalStateException(
e);
}
if (null !=
toRestoreClass) {
try {
result =
(
MethodBinding)
toRestoreClass.
newInstance();
}
catch (
InstantiationException e) {
throw new
IllegalStateException(
e);
}
catch (
IllegalAccessException a) {
throw new
IllegalStateException(
a);
}
}
if (null !=
result && null !=
savedState) {
// don't need to check transient, since that was
// done on the saving side.
((
StateHolder)
result).
restoreState(
context,
savedState);
}
methodBinding =
result;
}
}
else {
methodBinding = (
MethodBinding)
state;
}
}
private boolean
tranzient = false;
public boolean
isTransient() {
return
tranzient;
}
public void
setTransient(boolean
newTransientValue) {
tranzient =
newTransientValue;
}
//
// Helper methods for StateHolder
//
private static
Class loadClass(
String name,
Object fallbackClass) throws
ClassNotFoundException {
ClassLoader loader =
Thread.
currentThread().
getContextClassLoader();
if (
loader == null) {
loader =
fallbackClass.
getClass().
getClassLoader();
}
return
Class.
forName(
name, false,
loader);
}
}