package com.vci.server.query.parsers;

import com.vci.common.qt.interfaces.IParserFactory;
import com.vci.common.qt.object.QueryTemplate;

public class ParserFactory implements IParserFactory {
	private static ParserFactory _instance = null;
	
	public static ParserFactory getInstance() {
		if (_instance == null) {
			_instance = new ParserFactory();
		}
		
		return _instance;
	}
	
	public String parseToSql(QueryTemplate qt, boolean addGrandRightFlag) {
		
		if(qt.getLevel() == 1){
			ParserForOneLevel parserForOneLevel = new ParserForOneLevel(qt);
			parserForOneLevel.setAddGrandRightFlag(addGrandRightFlag);
			if(qt.isQueryISLeaf()){
				return parserForOneLevel.parseToSqlForLinkStartWith();
			}else{
				return parserForOneLevel.parseToSql();
			}
		}else{
			Parser parser = new Parser(qt);
			parser.setAddGrandRightFlag(addGrandRightFlag);
			return parser.parseToSql();
		}
		
		//return "";
	}
	
	
	public String parseToSubSql(QueryTemplate qt, boolean addGrandRightFlag) {
		
		if(qt.getLevel() == 1){
			ParserForOneLevel parserForOneLevel = new ParserForOneLevel(qt);
			parserForOneLevel.setAddGrandRightFlag(addGrandRightFlag);
			if(qt.isQueryISLeaf()){
				return parserForOneLevel.parseToSqlForLinkStartWith();
			}else{
				return parserForOneLevel.parseToSubSql();
			}
		}else{
			Parser parser = new Parser(qt);
			parser.setAddGrandRightFlag(addGrandRightFlag);
			return parser.parseToSubSql();
		}
		
		//return "";
	}

}