org.apache.taglibs.standard.lang.jstl.VariableResolver Maven / Gradle / Ivy
/*
* The contents of this file are subject to the terms
* of the Common Development and Distribution License
* (the "License"). You may not use this file except
* in compliance with the License.
*
* You can obtain a copy of the license at
* glassfish/bootstrap/legal/CDDLv1.0.txt or
* https://glassfish.dev.java.net/public/CDDLv1.0.html.
* See the License for the specific language governing
* permissions and limitations under the License.
*
* When distributing Covered Code, include this CDDL
* HEADER in each file and include the License file at
* glassfish/bootstrap/legal/CDDLv1.0.txt. If applicable,
* add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your
* own identifying information: Portions Copyright [yyyy]
* [name of copyright owner]
*
* Copyright 2005 Sun Microsystems, Inc. All rights reserved.
*
* Portions Copyright Apache Software Foundation.
*/
package org.apache.taglibs.standard.lang.jstl;
/**
*
* This class is used to customize the way the evaluator resolves
* variable references. For example, instances of this class can
* implement their own variable lookup mechanisms, or introduce the
* notion of "implicit variables" which override any other variables.
* An instance of this class should be passed to the evaluator's
* constructor.
*
*
Whenever the evaluator is invoked, it is passed a "context"
* Object from the application. For example, in a JSP environment,
* the "context" is a PageContext. That context object is eventually
* passed to this class, so that this class has a context in which to
* resolve variables.
*
* @author Nathan Abramson - Art Technology Group
* @version $Change: 181177 $$DateTime: 2001/06/26 08:45:09 $$Author: kchung $
**/
public interface 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;
//-------------------------------------
}