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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.facelets.el;
import java.lang.reflect.Method;
import java.util.Arrays;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import jakarta.el.ELContext;
import jakarta.el.ELException;
import jakarta.el.ELResolver;
import jakarta.el.FunctionMapper;
import jakarta.el.PropertyNotWritableException;
import jakarta.el.VariableMapper;
import jakarta.faces.context.ExternalContext;
import jakarta.faces.context.FacesContext;
import jakarta.faces.el.EvaluationException;
import jakarta.faces.el.PropertyNotFoundException;
import jakarta.faces.el.PropertyResolver;
import jakarta.faces.el.VariableResolver;
/**
*
*
* @author Jacob Hookom
* @version $Id$
* @deprecated
*/
@Deprecated
public final class LegacyELContext extends ELContext {
private static final String[] IMPLICIT_OBJECTS = new String[] { "application", "applicationScope", "cookie", "facesContext", "header", "headerValues",
"initParam", "param", "paramValues", "request", "requestScope", "session", "sessionScope", "view" };
private final static FunctionMapper FUNCTIONS = new EmptyFunctionMapper();
private final FacesContext faces;
private final ELResolver resolver;
private final VariableMapper variables;
public LegacyELContext(FacesContext faces) {
this.faces = faces;
resolver = new LegacyELResolver();
variables = new DefaultVariableMapper();
}
@Override
public ELResolver getELResolver() {
return resolver;
}
@Override
public FunctionMapper getFunctionMapper() {
return FUNCTIONS;
}
@Override
public VariableMapper getVariableMapper() {
return variables;
}
public FacesContext getFacesContext() {
return faces;
}
private final class LegacyELResolver extends ELResolver {
@Override
public Class getCommonPropertyType(ELContext context, Object base) {
return Object.class;
}
@Override
public Iterator getFeatureDescriptors(ELContext context, Object base) {
return Collections.EMPTY_LIST.iterator();
}
private VariableResolver getVariableResolver() {
return faces.getApplication().getVariableResolver();
}
private PropertyResolver getPropertyResolver() {
return faces.getApplication().getPropertyResolver();
}
@Override
public Class getType(ELContext context, Object base, Object property) {
if (property == null) {
return null;
}
try {
context.setPropertyResolved(true);
if (base == null) {
Object obj = getVariableResolver().resolveVariable(faces, property.toString());
return obj != null ? obj.getClass() : null;
} else {
if (base instanceof List || base.getClass().isArray()) {
return getPropertyResolver().getType(base, Integer.parseInt(property.toString()));
} else {
return getPropertyResolver().getType(base, property);
}
}
} catch (PropertyNotFoundException e) {
throw new jakarta.el.PropertyNotFoundException(e.getMessage(), e.getCause());
} catch (EvaluationException e) {
throw new ELException(e.getMessage(), e.getCause());
}
}
@Override
public Object getValue(ELContext context, Object base, Object property) {
if (property == null) {
return null;
}
try {
context.setPropertyResolved(true);
if (base == null) {
return getVariableResolver().resolveVariable(faces, property.toString());
} else {
if (base instanceof List || base.getClass().isArray()) {
return getPropertyResolver().getValue(base, Integer.parseInt(property.toString()));
} else {
return getPropertyResolver().getValue(base, property);
}
}
} catch (PropertyNotFoundException e) {
throw new jakarta.el.PropertyNotFoundException(e.getMessage(), e.getCause());
} catch (EvaluationException e) {
throw new ELException(e.getMessage(), e.getCause());
}
}
@Override
public boolean isReadOnly(ELContext context, Object base, Object property) {
if (property == null) {
return true;
}
try {
context.setPropertyResolved(true);
if (base == null) {
return false; // what can I do?
} else {
if (base instanceof List || base.getClass().isArray()) {
return getPropertyResolver().isReadOnly(base, Integer.parseInt(property.toString()));
} else {
return getPropertyResolver().isReadOnly(base, property);
}
}
} catch (PropertyNotFoundException e) {
throw new jakarta.el.PropertyNotFoundException(e.getMessage(), e.getCause());
} catch (EvaluationException e) {
throw new ELException(e.getMessage(), e.getCause());
}
}
@Override
public void setValue(ELContext context, Object base, Object property, Object value) {
if (property == null) {
throw new PropertyNotWritableException("Null Property");
}
try {
context.setPropertyResolved(true);
if (base == null) {
if (Arrays.binarySearch(IMPLICIT_OBJECTS, property.toString()) >= 0) {
throw new PropertyNotWritableException("Implicit Variable Not Setable: " + property);
} else {
Map scope = resolveScope(property.toString());
getPropertyResolver().setValue(scope, property, value);
}
} else {
if (base instanceof List || base.getClass().isArray()) {
getPropertyResolver().setValue(base, Integer.parseInt(property.toString()), value);
} else {
getPropertyResolver().setValue(base, property, value);
}
}
} catch (PropertyNotFoundException e) {
throw new jakarta.el.PropertyNotFoundException(e.getMessage(), e.getCause());
} catch (EvaluationException e) {
throw new ELException(e.getMessage(), e.getCause());
}
}
private Map resolveScope(String var) {
ExternalContext ext = faces.getExternalContext();
// cycle through the scopes to find a match, if no
// match is found, then return the requestScope
Map map = ext.getRequestMap();
if (!map.containsKey(var)) {
map = ext.getSessionMap();
if (!map.containsKey(var)) {
map = ext.getApplicationMap();
if (!map.containsKey(var)) {
map = ext.getRequestMap();
}
}
}
return map;
}
}
private final static class EmptyFunctionMapper extends FunctionMapper {
@Override
public Method resolveFunction(String prefix, String localName) {
return null;
}
}
}