package com.cx.psf;

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

/**
 * 分析环境上下文
 * @date 2012-9-2
 */
public class AnalyzeContext {
	private final static AnalyzeContext context = new AnalyzeContext();
	private SQLAnalyze analyze;
	private AnalyzeContext(){
		init();
	}
	
	private void init() {
		analyze = new SQLAnalyze();
		SQLCompiler compiler = new DefaultSQLCompiler();
		ParamGhost ghost = new DefaultParamGhost();
		compiler.setParamGhost(ghost);
		analyze.setCompiler(compiler);
	}
	
	public String analyze(String sql, String params){
		if(params == null || params.trim().equals("")){
			throw new NullPointerException("params 为null");
		}
		List<String> paramLists = new ArrayList<String>();
		String [] paramsArray = params.split(PSFConfig.PARAMS_SPLIT_CHAR);
		for (int i = 0; i < paramsArray.length; i++) {
			paramLists.add(paramsArray[i]);
		}
		
		return analyze.compile(sql, paramLists);
	}
	
	public static AnalyzeContext getContext(){
		return context;
	}
}