/*
 * Copyright (c) 1997, 2018 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0, which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 *
 * This Source Code may also be made available under the following Secondary
 * Licenses when the conditions for such availability set forth in the
 * Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
 * version 2 with the GNU Classpath Exception, which is available at
 * https://www.gnu.org/software/classpath/license.html.
 *
 * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
 */

package com.sun.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 jakarta.el.ValueExpression;
import jakarta.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();
    }

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

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

    // Safe cast.
    @Override
    @SuppressWarnings("unchecked")
    public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
        this.vars = (Map<String, ValueExpression>) in.readObject();
    }

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