/*
* Copyright (c) 1998-2011 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 javax.el;
import java.beans.FeatureDescriptor;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.Map;
import java.util.logging.Logger;
/**
* Resolves properties based on maps.
*/
public class MapELResolver extends ELResolver {
private final static Logger log
= Logger.getLogger(MapELResolver.class.getName());
private final boolean _isReadOnly;
public MapELResolver()
{
_isReadOnly = false;
}
public MapELResolver(boolean isReadOnly)
{
_isReadOnly = isReadOnly;
}
@Override
public Class<?> getCommonPropertyType(ELContext context, Object base)
{
if (base instanceof Map) {
context.setPropertyResolved(true);
return Object.class;
}
else
return null;
}
@Override
public Iterator<FeatureDescriptor> getFeatureDescriptors(ELContext context,
Object base)
{
if (base instanceof Map) {
context.setPropertyResolved(true);
ArrayList<FeatureDescriptor> keys = new ArrayList<FeatureDescriptor>();
for (Object key : ((Map) base).keySet()) {
String name = String.valueOf(key);
FeatureDescriptor desc = new FeatureDescriptor();
desc.setName(name);
desc.setDisplayName(name);
desc.setShortDescription("");
desc.setExpert(false);
desc.setHidden(false);
desc.setPreferred(true);
if (key == null)
desc.setValue(ELResolver.TYPE, null);
else
desc.setValue(ELResolver.TYPE, key.getClass());
desc.setValue(ELResolver.RESOLVABLE_AT_DESIGN_TIME, Boolean.TRUE);
keys.add(desc);
}
return keys.iterator();
}
else {
return null;
}
}
@Override
public Class<?> getType(ELContext context,
Object base,
Object property)
{
if (context == null)
throw new NullPointerException();
if (base instanceof Map) {
context.setPropertyResolved(true);
return Object.class;
}
else
return null;
}
@Override
public Object getValue(ELContext context,
Object base,
Object property)
{
if (base instanceof Map && property != null) {
Map map = (Map) base;
context.setPropertyResolved(true);
return map.get(property);
}
else {
return null;
}
}
@Override
public boolean isReadOnly(ELContext context,
Object base,
Object property)
{
if (base instanceof Map) {
context.setPropertyResolved(true);
return _isReadOnly;
}
else
return true;
}
@Override
public void setValue(ELContext context,
Object base,
Object property,
Object value)
{
if (_isReadOnly)
throw new PropertyNotWritableException("resolver is readonly");
if (base instanceof Map && property != null) {
Map map = (Map) base;
context.setPropertyResolved(true);
try {
map.put(property, value);
} catch (UnsupportedOperationException e) {
throw new PropertyNotWritableException("map "
+ base
+ " of type "
+ map.getClass().getName()
+ " is umodifiable");
}
}
}
}