org.apache.taglibs.standard.lang.jstl.NamedValue Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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
*/
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);
}
}
//-------------------------------------
}