/*
* The Apache Software License, Version 1.1
*
* Copyright (c) 1999-2003 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution, if
* any, must include the following acknowlegement:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowlegement may appear in the software itself,
* if and wherever such third-party acknowlegements normally appear.
*
* 4. The names "The Jakarta Project", "Tomcat", and "Apache Software
* Foundation" must not be used to endorse or promote products derived
* from this software without prior written permission. For written
* permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache"
* nor may "Apache" appear in their names without prior written
* permission of the Apache Group.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
*/
package org.apache.taglibs.standard.lang.jstl;
import javax.servlet.jsp.PageContext;
/**
*
* <p>This is the JSTL-specific implementation of VariableResolver.
* It looks up variable references in the PageContext, and also
* recognizes references to implicit objects.
*
* @author Nathan Abramson - Art Technology Group
* @version $Change: 181177 $$DateTime: 2001/06/26 08:45:09 $$Author: pierred $
**/
public class JSTLVariableResolver
implements VariableResolver
{
//-------------------------------------
/**
*
* Resolves the specified variable within the given context.
* Returns null if the variable is not found.
**/
public Object resolveVariable (String pName,
Object pContext)
throws ELException
{
PageContext ctx = (PageContext) pContext;
// Check for implicit objects
if ("pageContext".equals (pName)) {
return ctx;
}
else if ("pageScope".equals (pName)) {
return ImplicitObjects.
getImplicitObjects (ctx).
getPageScopeMap ();
}
else if ("requestScope".equals (pName)) {
return ImplicitObjects.
getImplicitObjects (ctx).
getRequestScopeMap ();
}
else if ("sessionScope".equals (pName)) {
return ImplicitObjects.
getImplicitObjects (ctx).
getSessionScopeMap ();
}
else if ("applicationScope".equals (pName)) {
return ImplicitObjects.
getImplicitObjects (ctx).
getApplicationScopeMap ();
}
else if ("param".equals (pName)) {
return ImplicitObjects.
getImplicitObjects (ctx).
getParamMap ();
}
else if ("paramValues".equals (pName)) {
return ImplicitObjects.
getImplicitObjects (ctx).
getParamsMap ();
}
else if ("header".equals (pName)) {
return ImplicitObjects.
getImplicitObjects (ctx).
getHeaderMap ();
}
else if ("headerValues".equals (pName)) {
return ImplicitObjects.
getImplicitObjects (ctx).
getHeadersMap ();
}
else if ("initParam".equals (pName)) {
return ImplicitObjects.
getImplicitObjects (ctx).
getInitParamMap ();
}
else if ("cookie".equals (pName)) {
return ImplicitObjects.
getImplicitObjects (ctx).
getCookieMap ();
}
// Otherwise, just look it up in the page context
else {
return ctx.findAttribute (pName);
}
}
//-------------------------------------
}