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EE4J Compatible Implementation for Jakarta Faces API
/*
* Copyright (c) 1997, 2020 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0, which is available at
* http://www.eclipse.org/legal/epl-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception, which is available at
* https://www.gnu.org/software/classpath/license.html.
*
* SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
*/
package jakarta.faces.component;
import jakarta.faces.context.FacesContext;
import jakarta.faces.el.EvaluationException;
import jakarta.faces.el.MethodBinding;
import jakarta.faces.validator.Validator;
import jakarta.faces.validator.ValidatorException;
/**
*
* 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 = 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);
}
}