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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 SoftwareFoundation, 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.HashMap;
import java.util.Iterator;
import java.util.Map;
/**
* Variable resolver using an underlying Map.
*/
public class MapVariableResolver extends ELResolver {
private Map _map;
/**
* Creates the resolver
*/
public MapVariableResolver(Map map)
{
if (map == null)
map = new HashMap();
_map = map;
}
/**
* Creates the resolver
*/
public MapVariableResolver()
{
this(new HashMap());
}
/**
* Returns the named variable value.
*/
@Override
public Object getValue(ELContext context, Object base, Object property)
{
if (base != null || ! (property instanceof String))
return null;
String var = (String) property;
Object value = _map.get(var);
if (value != null) {
context.setPropertyResolved(true);
return value;
}
return null;
}
/**
* Returns the named variable value.
*/
@Override
public void setValue(ELContext context,
Object base,
Object property,
Object value)
{
if (! (base instanceof String) || property != null)
return;
String var = (String) base;
context.setPropertyResolved(true);
_map.put(var, value);
}
/**
* Sets the named variable value.
*/
public Object put(String var, Object value)
{
return _map.put(var, value);
}
/**
* Returns true for read-only.
*/
@Override
public boolean isReadOnly(ELContext context, Object base, Object property)
{
if (property != null || ! (base instanceof String))
return true;
context.setPropertyResolved(true);
return false;
}
/**
* Returns the named variable value.
*/
@Override
public Class> getType(ELContext context,
Object base,
Object property)
{
Object value = getValue(context, base, property);
if (value != null)
return value.getClass();
else
return null;
}
public Class> getCommonPropertyType(ELContext context,
Object base)
{
return null;
}
public Iterator
getFeatureDescriptors(ELContext context, Object base)
{
return null;
}
/**
* Gets the map.
*/
public Map getMap()
{
return _map;
}
/**
* Sets the map.
*/
public void setMap(Map map)
{
_map = map;
}
public String toString()
{
return "MapVariableResolver[" + _map + "]";
}
}