com.sun.faces.el.DemuxCompositeELResolver Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of jakarta.faces-api Show documentation
Show all versions of jakarta.faces-api Show documentation
Jakarta Faces defines an MVC framework for building user interfaces for web applications,
including UI components, state management, event handing, input validation, page navigation, and
support for internationalization and accessibility.
/*
* 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;
}
}