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EE4J Compatible Implementation for Jakarta Faces API
/*
* Copyright (c) 1997, 2018 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.util.ArrayList;
import java.util.Iterator;
import java.beans.FeatureDescriptor;
import java.util.Map.Entry;
import java.util.Set;
import java.util.Map;
import javax.faces.context.ExternalContext;
import javax.faces.context.FacesContext;
import javax.faces.component.UIViewRoot;
import javax.el.ELException;
import javax.el.PropertyNotFoundException;
import javax.el.ELContext;
import javax.el.ELResolver;
import com.sun.faces.util.Util;
import com.sun.faces.util.MessageUtils;
import com.sun.faces.application.ApplicationAssociate;
import com.sun.faces.mgbean.BeanManager;
public class ScopedAttributeELResolver extends ELResolver {
public ScopedAttributeELResolver() {
}
@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, "base and property"); // ?????
throw new PropertyNotFoundException(message);
}
context.setPropertyResolved(true);
String attribute = property.toString();
FacesContext facesContext = (FacesContext)
context.getContext(FacesContext.class);
ExternalContext ec = facesContext.getExternalContext();
// check request
Object result = ec.getRequestMap().get(attribute);
if (result != null) {
return result;
}
// check UIViewRoot
UIViewRoot root = facesContext.getViewRoot();
if (root != null) {
Map viewMap = root.getViewMap(false);
if (viewMap != null) {
result = viewMap.get(attribute);
}
}
if (result != null) {
return result;
}
// check session
result = ec.getSessionMap().get(attribute);
if (result != null) {
return result;
}
// check application
result = ec.getApplicationMap().get(attribute);
if (result != null) {
return result;
}
// if we get to this point, nothing was found in the standard scopes.
// If the attribute refers to an entity handled by the BeanManager
// try getting the value from there as the value may be in a custom
// scope.
ApplicationAssociate associate = ApplicationAssociate.getCurrentInstance();
if (associate != null) {
BeanManager manager = associate.getBeanManager();
if (manager != null && manager.isManaged(attribute)) {
return manager.getBeanFromScope(attribute, facesContext);
}
}
return null;
}
@Override
public Class getType(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, "base and property"); // ?????
throw new PropertyNotFoundException(message);
}
context.setPropertyResolved(true);
return Object.class;
}
@Override
public void setValue(ELContext context, Object base, Object property,
Object val) throws ELException {
if (base != null) {
return;
}
if (property == null) {
String message = MessageUtils.getExceptionMessageString
(MessageUtils.NULL_PARAMETERS_ERROR_MESSAGE_ID, "base and property"); // ?????
throw new PropertyNotFoundException(message);
}
context.setPropertyResolved(true);
String attribute = (String) property;
FacesContext facesContext = (FacesContext)
context.getContext(FacesContext.class);
ExternalContext ec = facesContext.getExternalContext();
if ((ec.getRequestMap().get(attribute)) != null) {
ec.getRequestMap().put(attribute, val);
} else if ((facesContext.getViewRoot()) != null && (facesContext.getViewRoot().getViewMap().get(attribute)) != null) {
facesContext.getViewRoot().getViewMap().put(attribute, val);
} else if ((ec.getSessionMap().get(attribute)) != null) {
ec.getSessionMap().put(attribute, val);
} else if ((ec.getApplicationMap().get(attribute)) != null) {
ec.getApplicationMap().put(attribute, val);
} else {
// if the property doesn't exist in any of the scopes, put it in
// request scope.
ec.getRequestMap().put(attribute, val);
}
}
@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, "base and property"); // ?????
throw new PropertyNotFoundException(message);
}
context.setPropertyResolved(true);
return false;
}
@Override
public Iterator getFeatureDescriptors(ELContext context, Object base) {
ArrayList list = new ArrayList<>();
FacesContext facesContext = (FacesContext)
context.getContext(FacesContext.class);
ExternalContext ec = facesContext.getExternalContext();
// add attributes in request scope.
Set> attrs = ec.getRequestMap().entrySet();
for (Entry entry : attrs) {
String attrName = entry.getKey();
Object attrValue = entry.getValue();
list.add(Util.getFeatureDescriptor(attrName, attrName,
"request scope attribute", false, false, true, attrValue.getClass(),
Boolean.TRUE));
}
// add attributes in view scope.
UIViewRoot root = facesContext.getViewRoot();
if (root != null) {
Map viewMap = root.getViewMap(false);
if (viewMap != null && viewMap.size() != 0) {
attrs = viewMap.entrySet();
for (Entry entry : attrs) {
String attrName = entry.getKey();
Object attrValue = entry.getValue();
list.add(Util.getFeatureDescriptor(attrName, attrName,
"view scope attribute", false, false, true, attrValue.getClass(),
Boolean.TRUE));
}
}
}
// add attributes in session scope.
attrs = ec.getSessionMap().entrySet();
for (Entry entry : attrs) {
String attrName = entry.getKey();
Object attrValue = entry.getValue();
list.add(Util.getFeatureDescriptor(attrName, attrName,
"session scope attribute", false, false, true, attrValue.getClass(),
Boolean.TRUE));
}
// add attributes in application scope.
attrs = ec.getApplicationMap().entrySet();
for (Entry entry : attrs) {
String attrName = entry.getKey();
Object attrValue = entry.getValue();
list.add(Util.getFeatureDescriptor(attrName, attrName,
"application scope attribute", false, false, true, attrValue.getClass(),
Boolean.TRUE));
}
return list.iterator();
}
@Override
public Class getCommonPropertyType(ELContext context, Object base) {
if (base != null) {
return null;
}
return Object.class;
}
}