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EE4J Compatible Implementation for Jakarta Faces API
/*
* Copyright (c) 2010, 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.el;
import java.beans.FeatureDescriptor;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import com.sun.faces.application.ApplicationAssociate;
import com.sun.faces.mgbean.BeanBuilder;
import com.sun.faces.mgbean.BeanManager;
import com.sun.faces.util.MessageUtils;
import com.sun.faces.util.Util;
import jakarta.el.ELContext;
import jakarta.el.ELException;
import jakarta.el.ELResolver;
import jakarta.el.PropertyNotFoundException;
import jakarta.faces.context.ExternalContext;
import jakarta.faces.context.FacesContext;
public class ManagedBeanELResolver extends ELResolver {
public ManagedBeanELResolver() {
}
@Override
public Object getValue(ELContext context, Object base, Object property) throws ELException {
if (base != null) {
return null;
}
if (property == null) {
String message = MessageUtils.getExceptionMessageString(MessageUtils.NULL_PARAMETERS_ERROR_MESSAGE_ID, "property");
throw new PropertyNotFoundException(message);
}
return resolveBean(context, property, true);
}
@Override
public Class getType(ELContext context, Object base, Object property) throws ELException {
if (base == null && property == null) {
String message = MessageUtils.getExceptionMessageString(MessageUtils.NULL_PARAMETERS_ERROR_MESSAGE_ID, "property");
throw new PropertyNotFoundException(message);
}
return null;
}
@Override
public void setValue(ELContext context, Object base, Object property, Object val) throws ELException {
if (base == null && property == null) {
String message = MessageUtils.getExceptionMessageString(MessageUtils.NULL_PARAMETERS_ERROR_MESSAGE_ID, "base and property");
throw new PropertyNotFoundException(message);
}
if (base == null) {
// create the bean if it doesn't exist. We won't mark the property
// as resolved in this case, since the spec requires us to actually
// wait to set the value until the ScopeAttributeELResolved so that
// implicit scopes with higher priority than this one have a crack
// at resolving the bean first
resolveBean(context, property, false);
}
}
@Override
public boolean isReadOnly(ELContext context, Object base, Object property) throws ELException {
if (base != null) {
return false;
}
if (property == null) {
String message = MessageUtils.getExceptionMessageString(MessageUtils.NULL_PARAMETERS_ERROR_MESSAGE_ID, "property");
throw new PropertyNotFoundException(message);
}
return false;
}
@Override
public Iterator getFeatureDescriptors(ELContext context, Object base) {
if (base != null) {
return null;
}
FacesContext facesContext = (FacesContext) context.getContext(FacesContext.class);
BeanManager beanManager = getBeanManager();
if (beanManager == null || beanManager.getRegisteredBeans().isEmpty()) {
List l = Collections.emptyList();
return l.iterator();
}
Map beans = beanManager.getRegisteredBeans();
List list = new ArrayList<>(beans.size());
// iterate over the list of managed beans
for (Map.Entry bean : beans.entrySet()) {
String beanName = bean.getKey();
BeanBuilder builder = bean.getValue();
String loc = Util.getLocaleFromContextOrSystem(facesContext).toString();
Map descriptions = builder.getDescriptions();
String description = null;
if (descriptions != null) {
description = descriptions.get(loc);
if (description == null) {
description = descriptions.get("DEFAULT");
}
}
list.add(Util.getFeatureDescriptor(beanName, beanName, description == null ? "" : description, false, false, true, builder.getBeanClass(),
Boolean.TRUE));
}
return list.iterator();
}
@Override
public Class getCommonPropertyType(ELContext context, Object base) {
if (base != null) {
return null;
}
return Object.class;
}
// --------------------------------------------------------- Private Methods
private static BeanManager getBeanManager() {
ApplicationAssociate associate = ApplicationAssociate.getCurrentInstance();
return associate != null ? associate.getBeanManager() : null;
}
private Object resolveBean(ELContext context, Object property, boolean markAsResolvedIfCreated) {
Object result = null;
BeanManager manager = getBeanManager();
if (manager != null) {
String beanName = property.toString();
BeanBuilder builder = manager.getBuilder(beanName);
if (builder != null) {
FacesContext facesContext = (FacesContext) context.getContext(FacesContext.class);
// JAVASERVERFACES-2989: Make sure to check request, session, and application.
ExternalContext extContext = facesContext.getExternalContext();
if (extContext.getRequestMap().containsKey(beanName)) {
return null;
} else if (null != extContext.getSession(false) && extContext.getSessionMap().containsKey(beanName)) {
return null;
} else if (extContext.getApplicationMap().containsKey(beanName)) {
return null;
}
result = manager.getBeanFromScope(beanName, builder, facesContext);
if (result == null) {
result = manager.create(beanName, builder, facesContext);
}
context.setPropertyResolved(markAsResolvedIfCreated && result != null);
}
}
return result;
}
}