/*
 * 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.struts2.el.lang;

import java.io.Externalizable;
import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectOutput;
import java.util.HashMap;
import java.util.Map;

import javax.el.ValueExpression;
import javax.el.VariableMapper;

public class VariableMapperImpl extends VariableMapper implements Externalizable {

    private static final long serialVersionUID = 1L;

    private Map<String, ValueExpression> vars = new HashMap<String, ValueExpression>();

    public VariableMapperImpl() {
        super();
    }

    public ValueExpression resolveVariable(String variable) {
        return this.vars.get(variable);
    }

    public ValueExpression setVariable(String variable,
            ValueExpression expression) {
        return this.vars.put(variable, expression);
    }

    public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
        this.vars = (Map<String, ValueExpression>) in.readObject();
    }

    public void writeExternal(ObjectOutput out) throws IOException {
        out.writeObject(this.vars);
    }
}
