/*
* 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 com.caucho.jsp.el;
import javax.el.ELContext;
import javax.el.ELException;
import javax.el.ELResolver;
import javax.servlet.ServletContext;
@SuppressWarnings("serial")
public class InitParamFieldExpression extends AbstractValueExpression
{
private final String _field;
InitParamFieldExpression(String field)
{
_field = field;
}
/**
* Evaluate the expr as an object.
*
* @param env the page context
*/
@Override
public Object getValue(ELContext env)
throws ELException
{
if (! (env instanceof ServletELContext)) {
ELResolver elResolver = env.getELResolver();
Object scope = elResolver.getValue(env, null, "initParam");
return elResolver.getValue(env, scope, _field);
}
ServletELContext servletEnv = (ServletELContext) env;
ServletContext webApp = servletEnv.getApplication();
return webApp.getInitParameter(_field);
}
public String getExpressionString()
{
return "initParam['" + _field + "']";
}
}