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Kernel for Resin Java Application Server
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/*
* Copyright (c) 1998-2012 Caucho Technology -- all rights reserved
*
* This file is part of Resin(R) Open Source
*
* Each copy or derived work must preserve the copyright notice and this
* notice unmodified.
*
* Resin Open Source is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Resin Open Source is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
* of NON-INFRINGEMENT. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with Resin Open Source; if not, write to the
*
* Free Software Foundation, Inc.
* 59 Temple Place, Suite 330
* Boston, MA 02111-1307 USA
*
* @author Scott Ferguson
*/
package com.caucho.el;
import javax.el.ELContext;
import javax.el.ELResolver;
import java.beans.FeatureDescriptor;
import java.util.ArrayList;
import java.util.Iterator;
/**
* Stack-based composite resolver,
*/
public class StackELResolver extends ELResolver {
public final ArrayList _resolverStack
= new ArrayList();
public StackELResolver()
{
}
public StackELResolver(ELResolver a, ELResolver b)
{
push(b);
push(a);
}
public void push(ELResolver elResolver)
{
if (elResolver == null)
throw new NullPointerException();
_resolverStack.add(elResolver);
}
public ELResolver pop()
{
if (_resolverStack.size() > 0)
return _resolverStack.remove(_resolverStack.size() - 1);
else
return null;
}
@Override
public Class> getCommonPropertyType(ELContext env, Object base)
{
for (int i = _resolverStack.size() - 1; i >= 0; i--) {
ELResolver resolver = _resolverStack.get(i);
return getCommonPropertyType(env, base);
}
return null;
}
@Override
public Iterator getFeatureDescriptors(ELContext env,
Object base)
{
ArrayList descriptors = null;
for (int i = _resolverStack.size() - 1; i >= 0; i--) {
ELResolver resolver = _resolverStack.get(i);
Iterator iter
= resolver.getFeatureDescriptors(env, base);
if (iter == null)
continue;
if (descriptors == null)
descriptors = new ArrayList();
while (iter.hasNext()) {
FeatureDescriptor desc = iter.next();
descriptors.add(desc);
}
}
if (descriptors != null)
return descriptors.iterator();
else
return null;
}
@Override
public Class> getType(ELContext context,
Object base,
Object property)
{
context.setPropertyResolved(false);
for (int i = _resolverStack.size() - 1; i >= 0; i--) {
ELResolver resolver = _resolverStack.get(i);
Class type = resolver.getType(context, base, property);
if (context.isPropertyResolved())
return type;
}
return null;
}
@Override
public Object getValue(ELContext context,
Object base,
Object property)
{
context.setPropertyResolved(false);
for (int i = _resolverStack.size() - 1; i >= 0; i--) {
ELResolver resolver = _resolverStack.get(i);
Object value = resolver.getValue(context, base, property);
if (context.isPropertyResolved()) {
return value;
}
}
return null;
}
@Override
public boolean isReadOnly(ELContext context,
Object base,
Object property)
{
context.setPropertyResolved(false);
for (int i = _resolverStack.size() - 1; i >= 0; i--) {
ELResolver resolver = _resolverStack.get(i);
boolean isReadOnly = resolver.isReadOnly(context, base, property);
if (context.isPropertyResolved())
return isReadOnly;
}
return false;
}
@Override
public void setValue(ELContext context,
Object base,
Object property,
Object value)
{
context.setPropertyResolved(false);
for (int i = _resolverStack.size() - 1; i >= 0; i--) {
ELResolver resolver = _resolverStack.get(i);
resolver.setValue(context, base, property, value);
if (context.isPropertyResolved()) {
return;
}
}
}
}