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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;
/**
* MethodBindingValidator 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}.
*/
class MethodBindingValidator extends MethodBindingAdapterBase implements Validator, StateHolder {
// ------------------------------------------------------ Instance Variables
private MethodBinding methodBinding = null;
public MethodBindingValidator() {}
/**
* Construct a {@link Validator} that contains a {@link
* MethodBinding}.
*/
public MethodBindingValidator(MethodBinding methodBinding) {
super();
this.methodBinding = methodBinding;
}
public MethodBinding getWrapped() {
return methodBinding;
}
// ------------------------------------------------------- Validator
@Override
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
//
@Override
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;
}
@Override
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 | IllegalAccessException e) {
throw new IllegalStateException(e);
}
}
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;
@Override
public boolean isTransient() {
return tranzient;
}
@Override
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);
}
}