add.java

来自「mysql集群」· Java 代码 · 共 52 行

/*
 * 	This program is free software; you can redistribute it and/or modify it under the terms of 
 * the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, 
 * or (at your option) any later version. 
 * 
 * 	This program 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 General Public License for more details. 
 * 	You should have received a copy of the GNU General Public License along with this program; 
 * if not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */
package com.meidusa.amoeba.parser.function;

import java.util.List;

import com.meidusa.amoeba.parser.expression.Expression;
import com.meidusa.amoeba.sqljep.ParseException;

/**
 * 
 * @author <a href=mailto:[e-mail]>Struct chen</a>
 *
 */
public class Add extends AbstractFunction {

	@SuppressWarnings("unchecked")
	public Comparable evaluate(List<Expression> list,Object[] parameters) throws ParseException {
		if(list.size()==2){
			Expression e1 = list.get(0);
			Expression e2 = list.get(1);
			if(e1.canEvaluate() && e2.canEvaluate()){
				Comparable comparable = com.meidusa.amoeba.sqljep.function.Add.add(e1.evaluate(parameters),e2.evaluate(parameters));
				return comparable;
			}
		}
		return null;
	}

	public void toString(List<Expression> list,StringBuilder builder) {
		builder.append(list.get(0).toString());
		builder.append(" ");
		builder.append(getName());
		builder.append(" ");
		builder.append(list.get(1).toString());
	}

	public String getName() {
		return "+";
	}

}