package cn.vagasnail.sgms.util;
 
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.sql.Connection;
import java.sql.SQLException;
import java.util.Arrays;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
 
import com.mchange.v2.c3p0.ComboPooledDataSource;
 
/**
 * 得到c3p0的數據庫連接池
 * 
 * @author vagasnail
 * 
 * 2009-3-26 下午07:54:10
 */
public class C3p0ConnectionFactory {
 private C3p0ConnectionFactory() {
 }
 
 private static ComboPooledDataSource ds = null;
 static {
 Map<String, String> configs = C3p0XMLParser
 .parserXML("c3p0-config.xml"); // 得到一個map包含配置信息
 ds = new ComboPooledDataSource(); // 得到一個數據庫連接池數據源
 Method[] fs = ComboPooledDataSource.class.getMethods(); // 得到該數據庫連接池數據源的所以方法信息
 Pattern pattern = Pattern.compile("get([A-Z]\\w+)()");
 for (Method m : fs) {
 Matcher matcher = pattern.matcher(m.getName());
 String str = "";
 String strLow = "";
 if (matcher.find()) {
 str = matcher.group(1);
 char c = str.charAt(0);
 strLow = Character.toLowerCase(c) + str.substring(1);
 }
 
 try {
 String value = configs.get(strLow);
 int intValue = 0;
 Method setMod = null;
 if (value != null && !"".equals(value)){
 try{
 intValue = Integer.parseInt(value);
 setMod = ComboPooledDataSource.class.getMethod("set"
 + str, int.class); //如果反射的方法中是int類型，而不是包裝類Interger，那么無法反射到該犯法，反射調用方法無法自動解包
   if(setMod != null)
 setMod.invoke(ds, intValue);
   
 
 }catch(NumberFormatException nfe){
 setMod = ComboPooledDataSource.class.getMethod("set"
 + str, String.class);
 if(setMod != null)
 setMod.invoke(ds, value);
 }
 }else
 continue;
 } catch (SecurityException e) {
 e.printStackTrace();
 } catch (NoSuchMethodException e) {
 // e.printStackTrace(); //如果方法不存在則繼續(xù)下面的循環(huán)
 continue;
 } catch (IllegalArgumentException e) {
 e.printStackTrace();
 } catch (IllegalAccessException e) {
 e.printStackTrace();
 } catch (InvocationTargetException e) {
 e.printStackTrace();
 }
 
 
 
 }
 
 login(configs);
 }
 
 private static void login(Map<String, String> configs){ 
 ds.setUser(configs.get("user"));
 ds.setPassword(configs.get("password"));
 
 }
 
 /**
 * 得到一個數據庫連接
 * 
 * @return 數據庫連接
 */
 public static synchronized Connection getConnection() {
 
 Connection con = null;
 try {
 con = ds.getConnection();
 } catch (SQLException e1) {
 e1.printStackTrace();
 }
 return con;
 }
/**
 * 關閉數據庫（并沒有真正的關閉，連接池把連接存儲起來下一次調用的時候還可以使用）
 * @param conn
 * @throws SQLException 
 *//*
 public static synchronized void close(Connection conn) {
 if (conn != null) {
 try {
 conn.close();
 conn = null;
 } catch (SQLException e) {
 e.printStackTrace();
 return;
 }
 }
 }*/
 
 public static int getCurrentConns() throws SQLException{
 return ds.getNumConnectionsAllUsers();
 }
 
}