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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.el;
import java.beans.FeatureDescriptor;
import java.util.Iterator;
import java.util.Map;
import com.sun.faces.util.RequestStateManager;
import jakarta.el.ELContext;
import jakarta.el.ELException;
import jakarta.el.ELResolver;
import jakarta.faces.context.FacesContext;
/**
* Maintains an ordered composite list of child ELResolver for Faces
.
*
*/
public final class ChainTypeCompositeELResolver extends FacesCompositeELResolver {
@Override
public void addRootELResolver(ELResolver elResolver) {
_wrapped.addRootELResolver(elResolver);
}
@Override
public void addPropertyELResolver(ELResolver elResolver) {
_wrapped.addPropertyELResolver(elResolver);
}
@Override
public void add(ELResolver elResolver) {
_wrapped.add(elResolver);
}
@Override
public Object getValue(ELContext context, Object base, Object property) throws ELException {
FacesContext ctx = getFacesContext(context);
if (ctx == null) {
return null;
}
Map stateMap = RequestStateManager.getStateMap(ctx);
stateMap.put(RequestStateManager.EL_RESOLVER_CHAIN_TYPE_NAME, _chainType);
Object result = null;
try {
result = _wrapped.getValue(context, base, property);
} finally {
stateMap.remove(RequestStateManager.EL_RESOLVER_CHAIN_TYPE_NAME);
}
return result;
}
@Override
public Class getType(ELContext context, Object base, Object property) throws ELException {
FacesContext ctx = getFacesContext(context);
if (ctx == null) {
return null;
}
Map stateMap = RequestStateManager.getStateMap(ctx);
stateMap.put(RequestStateManager.EL_RESOLVER_CHAIN_TYPE_NAME, _chainType);
Class result = null;
try {
result = _wrapped.getType(context, base, property);
} finally {
stateMap.remove(RequestStateManager.EL_RESOLVER_CHAIN_TYPE_NAME);
}
return result;
}
@Override
public void setValue(ELContext context, Object base, Object property, Object val) throws ELException {
FacesContext ctx = getFacesContext(context);
if (ctx == null) {
return;
}
Map stateMap = RequestStateManager.getStateMap(ctx);
stateMap.put(RequestStateManager.EL_RESOLVER_CHAIN_TYPE_NAME, _chainType);
try {
_wrapped.setValue(context, base, property, val);
} finally {
stateMap.remove(RequestStateManager.EL_RESOLVER_CHAIN_TYPE_NAME);
}
}
@Override
public boolean isReadOnly(ELContext context, Object base, Object property) throws ELException {
FacesContext ctx = getFacesContext(context);
if (ctx == null) {
return false;
}
Map stateMap = RequestStateManager.getStateMap(ctx);
stateMap.put(RequestStateManager.EL_RESOLVER_CHAIN_TYPE_NAME, _chainType);
boolean result = false;
try {
result = _wrapped.isReadOnly(context, base, property);
} finally {
stateMap.remove(RequestStateManager.EL_RESOLVER_CHAIN_TYPE_NAME);
}
return result;
}
@Override
public Iterator getFeatureDescriptors(ELContext context, Object base) {
FacesContext ctx = getFacesContext(context);
Iterator result = null;
if (ctx != null) {
Map stateMap = RequestStateManager.getStateMap(ctx);
stateMap.put(RequestStateManager.EL_RESOLVER_CHAIN_TYPE_NAME, _chainType);
try {
result = _wrapped.getFeatureDescriptors(context, base);
} finally {
stateMap.remove(RequestStateManager.EL_RESOLVER_CHAIN_TYPE_NAME);
}
}
return result;
}
@Override
public ELResolverChainType getChainType() {
return _chainType;
}
private final FacesCompositeELResolver _wrapped;
private final ELResolverChainType _chainType;
/**
*
* Guarantee that this instance knows of what chain it is a member.
*
*
* @param chainType the ELResolverChainType
*/
public ChainTypeCompositeELResolver(ELResolverChainType chainType) {
_wrapped = new DemuxCompositeELResolver(chainType);
_chainType = chainType;
}
public ChainTypeCompositeELResolver(FacesCompositeELResolver delegate) {
_wrapped = delegate;
_chainType = delegate.getChainType();
}
/**
* @param elContext context for the current expression evaluation
* @return the FacesContext
associated with this expression evaluation
*/
private FacesContext getFacesContext(ELContext elContext) {
return (FacesContext) elContext.getContext(FacesContext.class);
}
}