ClassExpression.java

/**
 *  Copyright (C) 2010 dennis zhuang (killme2008@gmail.com)
 *
 *  This library is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU Lesser General Public License as published
 *  by the Free Software Foundation; either version 2.1 of the License, or
 *  (at your option) any later version.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 **/
package com.googlecode.aviator;

import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.Set;

import com.googlecode.aviator.exception.ExpressionRuntimeException;


/**
 * Compiled expression,all generated class inherit this class
 * 
 * @author dennis
 * 
 */
public abstract class ClassExpression extends BaseExpression {

    public ClassExpression(List<String> varNames) {
        super(varNames);
    }


    /*
     * (non-Javadoc)
     * 
     * @see com.googlecode.aviator.IExpression#execute(java.util.Map)
     */
    public Object execute(Map<String, Object> env) {
        if (env == null) {
            env = Collections.emptyMap();
        }

        try {
            return execute0(env);
        }
        catch (ExpressionRuntimeException e) {
            throw e;
        }
        catch (Throwable e) {
            throw new ExpressionRuntimeException("Execute expression error", e);
        }

    }


    public abstract Object execute0(Map<String, Object> env);


    /**
     * Get generated java class
     * 
     * @return
     */
    public Class<?> getJavaClass() {
        return this.getClass();
    }
}