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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.jasper.runtime;

import java.util.HashMap;
import javax.el.ELContext;
import javax.el.ELResolver;
import javax.el.VariableMapper;
import javax.el.ValueExpression;


/**
 * 

This is the implementation of VariableMapper. * The compiler creates an empty variable mapper when an ELContext is created. * The variable mapper will be updated by tag handlers, if necessary. * * @author Kin-man Chung * @version $Change: 181177 $$DateTime: 2001/06/26 08:45:09 $$Author: kchung $ */ public class VariableMapperImpl extends VariableMapper { //------------------------------------- /** * Constructor */ public VariableMapperImpl () { map = new HashMap(); } //------------------------------------- /** * Resolves the specified variable within the given context. * Returns null if the variable is not found. */ public ValueExpression resolveVariable (String variable) { return map.get(variable); } public ValueExpression setVariable(String variable, ValueExpression expression) { ValueExpression prev = null; if (expression == null) { map.remove(variable); } else { prev = map.get(variable); map.put(variable, expression); } return prev; } private HashMap map; }





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