baseexpressionlist.java

来自「mysql集群」· Java 代码 · 共 85 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.expression;

import java.util.ArrayList;
import java.util.List;

/**
 * 
 * @author <a href=mailto:[e-mail]>Struct chen</a>
 *
 */
public abstract class BaseExpressionList extends Expression {
	
	protected List<Expression> eList = new ArrayList<Expression>();
	public BaseExpressionList() {
		
	}
	public BaseExpressionList(Expression expression) {
		if(expression != null){
			addExpression(expression);
		}
	}

	public List<Expression> getAllExpression(){
		return eList;
	}
	
	public boolean isRealtime(){
		for(Expression e:eList){
			if(e.isRealtime()){
				return true;
			}
		}
		return false;
	}
	
	protected  abstract BaseExpressionList getReverseObject();
	
	@Override
	public Expression reverse() {
		BaseExpressionList list = getReverseObject();
		for(Expression e: this.eList){
			Expression reversedExpression = e.reverse();
			list.addExpression(reversedExpression);
		}
		return list;
	}
	
	public void addExpression(Expression expression){
		eList.add(expression);
	}
	
	public int getSize(){
		if(eList == null) return 0;
		return eList.size();
	}
	
	protected void toString(StringBuilder builder,String concatString){
		int current = 0;
		if(eList.size()>=2){
			builder.append("(");
		}
		for(Expression e:eList){
			e.toString(builder);
			current ++;
			if(current != eList.size()){
				builder.append(concatString);
			}
		}
		if(eList.size()>=2){
			builder.append(")");
		}
	}
}