/**
 * Copyright: Copyright (c) 2004 Handson
 * Description: 錕斤拷db-config錕僥鹼拷錕叫伙拷取錕斤拷菘錕斤拷錕斤拷錕斤拷錕較?
 * Title: ConnectionProperty.java
 * @author Administrator
 * Create Time: 錕斤拷錕斤拷10:05:30
 * @Version:1.0
 */
package cn.handson.model.connection;

import java.io.IOException;
import java.util.logging.Logger;

import javax.xml.parsers.*;

import org.w3c.dom.*;
import org.xml.sax.SAXException;

//import cn.handson.framework.util.FileClassPath;

public class ConnectionProperty {
 
  private static Logger log = Logger.getLogger("ConnectionProperty");
	
  private static final String XML_FILE = "/resources/dbconfig.xml";
  private static ConnectionProperty instance = new ConnectionProperty();

  private String driverClassName = "";
  private String url = "";
  private String user = "";
  private String password = "";
  private String providerType = "";
  private String jndiName = "";
  private String dbms = "";

  /**
   * Description: 錕斤拷錕斤拷模式錕斤拷錕斤拷錕斤拷一錕斤拷ConnectionProperty錕斤拷實錕斤拷
   * @return ConnectionProperty錕斤拷實錕斤拷
   */
  public static ConnectionProperty getInstance(){
    if( instance == null ){
      instance = new ConnectionProperty();
    }
    return instance;
  }
  /**
   * Description錕斤拷錕斤拷錕斤拷Dom錕斤拷錕斤拷錕斤拷菘錕斤拷錕斤拷錕斤拷錕斤拷錕斤拷募錕?
   */
  private ConnectionProperty(){
	//FileClassPath fcp = new FileClassPath();
    DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
    DocumentBuilder builder = null;
    Document doc = null;

    
    try {
    	String xmlFile = this.getClass().getResource(XML_FILE).getPath();
		builder = factory.newDocumentBuilder();
		doc = builder.parse(xmlFile);
	} catch (ParserConfigurationException e) {
		log.warning(e.getMessage());
	} catch (SAXException e) {
		log.warning(e.getMessage());
	} catch (IOException e) {
		log.warning(e.getMessage());
	}
    

    Element root = doc.getDocumentElement();
    providerType = root.getAttribute("type");
    dbms = root.getAttribute("dbms");
    if( providerType.equals("connection_pool") ){
       jndiName = root.getAttribute("jndi");
    }
    else if( providerType.equals("default") ){
      driverClassName = value( root, "driver_class_name" );
      url = value( root, "url" );
      user = value( root, "user" );
      password = value( root, "password" );
    }

    report();
  }

  /**
   * Description: 錕斤拷印錕斤拷菘錕絣錕接憋拷錕斤拷 
   */
  private void report(){
    System.out.println("Connection provider type is " + providerType);
    if(providerType.equals("connection_pool")){
      if (jndiName != null && !jndiName.equals("")) {
        System.out.println("JNDI name is " + jndiName);
      }
      else {
        System.out.println("Not found jndi Name!");
      }
    }
    else{
      System.out.println(this.driverClassName + "\n" + this.url + "\n" +
                         this.user + "\n" + this.password);
    }
  }
  /**
   * Description: 
   * @param element 
   * @param tagName
   * @return
   */
  private String value( Element element, String tagName ){
    Element e = (Element)element.getElementsByTagName(tagName).item(0);
    Text text = (Text) e.getFirstChild();
    return text.getNodeValue();
  }

  public String getProviderType(){
    return providerType;
  }

  public String getJndiName(){
    return jndiName;
  }

  public String getDriverClassName(){
    return driverClassName;
  }

  public String getUrl(){
    return url;
  }

  public String getUser(){
    return user;
  }

  public String getPassword(){
      return password;
  }
  public String getDBMS(){
    return dbms;
  }
//Test
  public static void main(String []args){
    ConnectionProperty cp = ConnectionProperty.getInstance();
    System.out.println(cp.getJndiName());
    System.out.println(cp.getDriverClassName());
    System.out.println(cp.getPassword());
    System.out.println(cp.getUrl());
    System.out.println(cp.getUser());
    System.out.println(cp.getProviderType());
    System.out.println(cp.getDBMS());
  }
}