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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 com.sun.faces.application;
import static com.sun.faces.util.Util.isAnyNull;
import static com.sun.faces.util.Util.loadClass2;
import static com.sun.faces.util.Util.newInstance;
import java.io.Serializable;
import java.lang.reflect.Method;
import java.util.Arrays;
import jakarta.el.ELContext;
import jakarta.el.ELException;
import jakarta.el.ExpressionFactory;
import jakarta.el.MethodExpression;
import jakarta.el.MethodInfo;
import jakarta.el.PropertyNotFoundException;
import jakarta.el.ValueExpression;
import jakarta.faces.component.StateHolder;
import jakarta.faces.context.FacesContext;
import jakarta.faces.el.EvaluationException;
import jakarta.faces.el.MethodBinding;
import jakarta.faces.el.MethodNotFoundException;
/**
*
* Wrap a MethodExpression instance and expose it as a MethodBinding
*
*
*/
public class MethodBindingMethodExpressionAdapter extends MethodBinding implements StateHolder, Serializable {
private static final long serialVersionUID = 6351778415298720238L;
private MethodExpression methodExpression = null;
private boolean tranzient;
public MethodBindingMethodExpressionAdapter() {
} // for StateHolder
public MethodBindingMethodExpressionAdapter(MethodExpression methodExpression) {
this.methodExpression = methodExpression;
}
@Override
public Object invoke(FacesContext context, Object params[]) throws EvaluationException, MethodNotFoundException {
if (context == null) {
throw new NullPointerException("FacesConext -> null");
}
try {
return methodExpression.invoke(context.getELContext(), params);
} catch (jakarta.el.MethodNotFoundException | NullPointerException e) {
throw new MethodNotFoundException(e);
} catch (PropertyNotFoundException e) {
throw new EvaluationException(e);
} catch (ELException e) {
Throwable cause = e.getCause();
if (cause == null) {
cause = e;
}
throw new EvaluationException(cause);
}
}
@Override
public Class getType(FacesContext context) throws MethodNotFoundException {
if (context == null) {
throw new NullPointerException("FacesConext -> null");
}
try {
return methodExpression.getMethodInfo(context.getELContext()).getReturnType();
} catch (ELException e) {
throw new MethodNotFoundException(e);
}
}
@Override
public String getExpressionString() {
return methodExpression.getExpressionString();
}
@Override
public boolean equals(Object other) {
if (this == other) {
return true;
}
if (other instanceof MethodBindingMethodExpressionAdapter) {
return methodExpression.equals(((MethodBindingMethodExpressionAdapter) other).getWrapped());
} else if (other instanceof MethodBinding) {
MethodBinding binding = (MethodBinding) other;
// We'll need to do a little leg work to determine
// if the MethodBinding is equivalent to the
// wrapped MethodExpression
String expr = binding.getExpressionString();
int idx = expr.indexOf('.');
String target = expr.substring(0, idx).substring(2);
String t = expr.substring(idx + 1);
String method = t.substring(0, t.length() - 1);
FacesContext context = FacesContext.getCurrentInstance();
ELContext elContext = context.getELContext();
MethodInfo controlInfo = methodExpression.getMethodInfo(elContext);
// Ensure the method names are the same
if (!controlInfo.getName().equals(method)) {
return false;
}
// Using the target, create an expression and evaluate it.
ExpressionFactory factory = context.getApplication().getExpressionFactory();
ValueExpression ve = factory.createValueExpression(elContext, "#{" + target + '}', Object.class);
if (ve == null) {
return false;
}
Object result = ve.getValue(elContext);
if (result == null) {
return false;
}
// Get all of the methods with the matching name and try
// to find a match based on controlInfo's return and parameter
// types
Class type = binding.getType(context);
Method[] methods = result.getClass().getMethods();
for (Method meth : methods) {
if (meth.getName().equals(method) && type.equals(controlInfo.getReturnType())
&& Arrays.equals(meth.getParameterTypes(), controlInfo.getParamTypes())) {
return true;
}
}
}
return false;
}
@Override
public int hashCode() {
return methodExpression.hashCode();
}
@Override
public boolean isTransient() {
return tranzient;
}
@Override
public void setTransient(boolean tranzient) {
this.tranzient = tranzient;
}
@Override
public Object saveState(FacesContext context) {
if (context == null) {
throw new NullPointerException();
}
Object result = null;
if (!tranzient) {
if (methodExpression instanceof StateHolder) {
Object[] stateStruct = new Object[2];
// save the actual state of our wrapped methodExpression
stateStruct[0] = ((StateHolder) methodExpression).saveState(context);
// save the class name of the methodExpression impl
stateStruct[1] = methodExpression.getClass().getName();
result = stateStruct;
} else {
result = methodExpression;
}
}
return result;
}
@Override
public void restoreState(FacesContext context, Object state) {
if (context == null) {
throw new NullPointerException();
}
if (state == null) {
return;
}
if (!(state instanceof MethodExpression)) {
Object[] stateStruct = (Object[]) state;
Object savedState = stateStruct[0];
String className = stateStruct[1].toString();
MethodExpression result = null;
if (className != null) {
Class toRestoreClass = loadClass2(className, this);
if (toRestoreClass != null) {
result = newInstance(toRestoreClass);
}
if (!isAnyNull(result, savedState)) {
// don't need to check transient, since that was
// done on the saving side.
((StateHolder) result).restoreState(context, savedState);
}
methodExpression = result;
}
} else {
methodExpression = (MethodExpression) state;
}
}
public MethodExpression getWrapped() {
return methodExpression;
}
}