org.apache.taglibs.standard.lang.jstl.NamedValue Maven / Gradle / Ivy
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/*
* Copyright (c) 1997-2018 Oracle and/or its affiliates. All rights reserved.
* Copyright 2004 The Apache Software Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.taglibs.standard.lang.jstl;
import java.util.Map;
/**
*
* Represents a name that can be used as the first element of a
* value.
*
* @author Nathan Abramson - Art Technology Group
* @author Shawn Bayern
* @version $Change: 181177 $$DateTime: 2001/06/26 08:45:09 $$Author: kchung $
**/
public class NamedValue
extends Expression
{
//-------------------------------------
// Constants
//-------------------------------------
//-------------------------------------
// Properties
//-------------------------------------
// property name
String mName;
public String getName ()
{ return mName; }
//-------------------------------------
/**
*
* Constructor
**/
public NamedValue (String pName)
{
mName = pName;
}
//-------------------------------------
// Expression methods
//-------------------------------------
/**
*
* Returns the expression in the expression language syntax
**/
public String getExpressionString ()
{
return StringLiteral.toIdentifierToken (mName);
}
//-------------------------------------
/**
*
* Evaluates by looking up the name in the VariableResolver
**/
public Object evaluate (Object pContext,
VariableResolver pResolver,
Map functions,
String defaultPrefix,
Logger pLogger)
throws ELException
{
if (pResolver == null) {
return null;
}
else {
return pResolver.resolveVariable (mName, pContext);
}
}
//-------------------------------------
}