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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.NoSuchElementException;
import jakarta.el.ELContext;
import jakarta.el.ELException;
import jakarta.el.ELResolver;
/**
* Maintains an ordered composite list of child ELResolver for Faces.
*
*/
public class DemuxCompositeELResolver extends FacesCompositeELResolver {
private final ELResolverChainType _chainType;
private ELResolver[] _rootELResolvers = new ELResolver[2];
private ELResolver[] _propertyELResolvers = new ELResolver[2];
private ELResolver[] _allELResolvers = new ELResolver[2];
private int _rootELResolverCount = 0;
private int _propertyELResolverCount = 0;
private int _allELResolverCount = 0;
public DemuxCompositeELResolver(ELResolverChainType chainType) {
if (chainType == null) {
throw new NullPointerException();
}
_chainType = chainType;
}
@Override
public ELResolverChainType getChainType() {
return _chainType;
}
private void _addAllELResolver(ELResolver elResolver) {
if (elResolver == null) {
throw new NullPointerException();
}
// grow array, if necessary
if (_allELResolverCount == _allELResolvers.length) {
ELResolver[] biggerResolvers = new ELResolver[_allELResolverCount * 2];
System.arraycopy(_allELResolvers, 0, biggerResolvers, 0, _allELResolverCount);
_allELResolvers = biggerResolvers;
}
// assign new resolver to end
_allELResolvers[_allELResolverCount] = elResolver;
_allELResolverCount++;
}
private void _addRootELResolver(ELResolver elResolver) {
if (elResolver == null) {
throw new NullPointerException();
}
// grow array, if necessary
if (_rootELResolverCount == _rootELResolvers.length) {
ELResolver[] biggerResolvers = new ELResolver[_rootELResolverCount * 2];
System.arraycopy(_rootELResolvers, 0, biggerResolvers, 0, _rootELResolverCount);
_rootELResolvers = biggerResolvers;
}
// assign new resolver to end
_rootELResolvers[_rootELResolverCount] = elResolver;
_rootELResolverCount++;
}
public void _addPropertyELResolver(ELResolver elResolver) {
if (elResolver == null) {
throw new NullPointerException();
}
// grow array, if necessary
if (_propertyELResolverCount == _propertyELResolvers.length) {
ELResolver[] biggerResolvers = new ELResolver[_propertyELResolverCount * 2];
System.arraycopy(_propertyELResolvers, 0, biggerResolvers, 0, _propertyELResolverCount);
_propertyELResolvers = biggerResolvers;
}
// assign new resolver to end
_propertyELResolvers[_propertyELResolverCount] = elResolver;
_propertyELResolverCount++;
}
@Override
public void addRootELResolver(ELResolver elResolver) {
// pass ELResolver to CompositeELResolver so that J2EE6 invoke() method works. Once we can
// have a compile dependency on J2EE6, we can override invoke() ourselves and remove this.
super.add(elResolver);
_addRootELResolver(elResolver);
_addAllELResolver(elResolver);
}
@Override
public void addPropertyELResolver(ELResolver elResolver) {
// pass ELResolver to CompositeELResolver so that J2EE6 invoke() method works. Once we can
// have a compile dependency on J2EE6, we can override invoke() ourselves and remove this.
super.add(elResolver);
_addPropertyELResolver(elResolver);
_addAllELResolver(elResolver);
}
@Override
public void add(ELResolver elResolver) {
// pass ELResolver to CompositeELResolver so that J2EE6 invoke() method works. Once we can
// have a compile dependency on J2EE6, we can override invoke() ourselves and remove this.
super.add(elResolver);
_addRootELResolver(elResolver);
_addPropertyELResolver(elResolver);
_addAllELResolver(elResolver);
}
private Object _getValue(int resolverCount, ELResolver[] resolvers, ELContext context, Object base, Object property) throws ELException {
for (int i = 0; i < resolverCount; i++) {
Object result = resolvers[i].getValue(context, base, property);
if (context.isPropertyResolved()) {
return result;
}
}
return null;
}
@Override
public Object getValue(ELContext context, Object base, Object property) throws ELException {
context.setPropertyResolved(false);
int resolverCount;
ELResolver[] resolvers;
if (base == null) {
resolverCount = _rootELResolverCount;
resolvers = _rootELResolvers;
} else {
resolverCount = _propertyELResolverCount;
resolvers = _propertyELResolvers;
}
return _getValue(resolverCount, resolvers, context, base, property);
}
private Class _getType(int resolverCount, ELResolver[] resolvers, ELContext context, Object base, Object property) throws ELException {
for (int i = 0; i < resolverCount; i++) {
Class type = resolvers[i].getType(context, base, property);
if (context.isPropertyResolved()) {
return type;
}
}
return null;
}
@Override
public Class getType(ELContext context, Object base, Object property) throws ELException {
context.setPropertyResolved(false);
int resolverCount;
ELResolver[] resolvers;
if (base == null) {
resolverCount = _rootELResolverCount;
resolvers = _rootELResolvers;
} else {
resolverCount = _propertyELResolverCount;
resolvers = _propertyELResolvers;
}
return _getType(resolverCount, resolvers, context, base, property);
}
private void _setValue(int resolverCount, ELResolver[] resolvers, ELContext context, Object base, Object property, Object val) throws ELException {
for (int i = 0; i < resolverCount; i++) {
resolvers[i].setValue(context, base, property, val);
if (context.isPropertyResolved()) {
return;
}
}
}
@Override
public void setValue(ELContext context, Object base, Object property, Object val) throws ELException {
context.setPropertyResolved(false);
int resolverCount;
ELResolver[] resolvers;
if (base == null) {
resolverCount = _rootELResolverCount;
resolvers = _rootELResolvers;
} else {
resolverCount = _propertyELResolverCount;
resolvers = _propertyELResolvers;
}
_setValue(resolverCount, resolvers, context, base, property, val);
}
private boolean _isReadOnly(int resolverCount, ELResolver[] resolvers, ELContext context, Object base, Object property) throws ELException {
for (int i = 0; i < resolverCount; i++) {
boolean isReadOnly = resolvers[i].isReadOnly(context, base, property);
if (context.isPropertyResolved()) {
return isReadOnly;
}
}
return false;
}
@Override
public boolean isReadOnly(ELContext context, Object base, Object property) throws ELException {
context.setPropertyResolved(false);
int resolverCount;
ELResolver[] resolvers;
if (base == null) {
resolverCount = _rootELResolverCount;
resolvers = _rootELResolvers;
} else {
resolverCount = _propertyELResolverCount;
resolvers = _propertyELResolvers;
}
return _isReadOnly(resolverCount, resolvers, context, base, property);
}
@Override
public Iterator getFeatureDescriptors(ELContext context, Object base) {
return new DescriptorIterator(context, base, _allELResolvers, _allELResolverCount);
}
private final static class DescriptorIterator implements Iterator {
// snapshot the ELResolver array to avoid using a non-static inner class that needs to
// make function calls
public DescriptorIterator(ELContext context, Object base, ELResolver[] resolvers, int resolverCount) {
_context = context;
_base = base;
_resolvers = resolvers;
_resolverCount = resolverCount;
}
@Override
public boolean hasNext() {
do {
// A null return does *not* mean hasNext() should return false.
Iterator currIterator = _getCurrIterator();
if (null != currIterator) {
if (currIterator.hasNext()) {
return true;
} else {
_currIterator = null;
_currResolverIndex++;
}
} else {
if (_currResolverIndex < _resolverCount) {
continue;
} else {
return false;
}
}
} while (true);
}
private Iterator _getCurrIterator() {
Iterator currIterator = _currIterator;
if (currIterator == null) {
if (_currResolverIndex < _resolverCount) {
currIterator = _resolvers[_currResolverIndex].getFeatureDescriptors(_context, _base);
_currResolverIndex++;
_currIterator = currIterator;
}
}
return currIterator;
}
@Override
public FeatureDescriptor next() {
if (hasNext()) {
return _getCurrIterator().next();
} else {
throw new NoSuchElementException();
}
}
@Override
public void remove() {
throw new UnsupportedOperationException();
}
private final ELContext _context;
private final Object _base;
private final ELResolver[] _resolvers;
private final int _resolverCount;
private int _currResolverIndex;
private Iterator _currIterator;
}
@Override
public Class getCommonPropertyType(ELContext context, Object base) {
return null;
}
}