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/**
 *  Copyright (c) 1997-2013, tinygroup.org ([email protected]).
 *
 *  Licensed under the GPL, Version 3.0 (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.gnu.org/licenses/gpl.html
 *
 *  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.
 * --------------------------------------------------------------------------
 *  版权 (c) 1997-2013, tinygroup.org ([email protected]).
 *
 *  本开源软件遵循 GPL 3.0 协议;
 *  如果您不遵循此协议，则不被允许使用此文件。
 *  你可以从下面的地址获取完整的协议文本
 *
 *       http://www.gnu.org/licenses/gpl.html
 */
package org.tinygroup.jspengine.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 vars = new HashMap();
    
    public VariableMapperImpl() {
        super();
    }

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

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

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

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