/*

 *

 * Copyright 2000 Sun Microsystems, Inc. All Rights Reserved.

 * 

 * This software is the proprietary information of Sun Microsystems, Inc.  

 * Use is subject to license terms.

 * 

 */



import java.sql.*;

import javax.sql.*;

import java.util.*;

import javax.ejb.*;

import javax.naming.*;



public class CustomerEJB implements EntityBean {



   private String customerId;

   private String salesRepId;

   private String name;

   private Connection con;

   private String dbName = "java:comp/env/jdbc/SalesDB";

   private EntityContext context;





   public String getSalesRepId() {



      return salesRepId;

   }

    

   public String getName() {



      System.out.println("entering getName()");

      return name;

   }



   public void setSalesRepId(String salesRepId) {



      this.salesRepId = salesRepId;

   }

    

   public void setName(String name) {



      this.name = name;

   }



   public String ejbCreate(String customerId, String salesRepId,

       String name) throws CreateException {

   

       System.out.println("in ejbCreate");

       try {

          insertCustomer(customerId, salesRepId, name);

       } catch (Exception ex) {

           throw new EJBException("ejbCreate: " + 

              ex.getMessage());

       }



       this.customerId = customerId;

       this.salesRepId = salesRepId;

       this.name = name;



       System.out.println("about to leave ejbCreate");

       return customerId;

   }

     

   public String ejbFindByPrimaryKey(String primaryKey) 

      throws FinderException {



      boolean result;



      try {

         result = selectByPrimaryKey(primaryKey);

       } catch (Exception ex) {

           throw new EJBException("ejbFindByPrimaryKey: " + 

              ex.getMessage());

       }



      if (result) {

         return primaryKey;

      }

      else {

         throw new ObjectNotFoundException

            ("Row for id " + primaryKey + " not found.");

      }

   }



   public Collection ejbFindBySalesRep(String salesRepId)

      throws FinderException {



      Collection result;



      try {

         result = selectBySalesRep(salesRepId);

       } catch (Exception ex) {

           throw new EJBException("ejbFindBySalesRep: " + 

              ex.getMessage());

       }



      if (result.isEmpty()) {

         throw new ObjectNotFoundException("No rows found.");

      }

      else {

         return result;

      }

   }



   public void ejbRemove() {



      try {

         deleteCustomer(customerId);

       } catch (Exception ex) {

           throw new EJBException("ejbRemove: " + 

              ex.getMessage());

       }

   } 



   public void setEntityContext(EntityContext context) {



      this.context = context;

      try {

         makeConnection();

      } catch (Exception ex) {

          throw new EJBException("Unable to connect to database. " +

             ex.getMessage());

      }

   }



   public void unsetEntityContext() {



      try {

         con.close();

      } catch (SQLException ex) {

          throw new EJBException("unsetEntityContext: " + ex.getMessage());

      }

   }



   public void ejbActivate() {



      customerId = (String)context.getPrimaryKey();

   }



   public void ejbPassivate() {



      customerId = null;

   }

   

   public void ejbLoad() {



      System.out.println("in ejbLoad");

      try {

         loadCustomer();

       } catch (Exception ex) {

           throw new EJBException("ejbLoad: " +

              ex.getMessage());

       }

      System.out.println("leaving ejbLoad");

   }



   public void ejbStore() {



      System.out.println("in ejbStore");

      try {

         storeCustomer();

       } catch (Exception ex) {

           throw new EJBException("ejbStore: " +

              ex.getMessage());

       }

      System.out.println("leaving ejbStore");

   }



   public void ejbPostCreate(String customerId, String salesRepId,

        String name) { }



/*********************** Database Routines *************************/



   private void makeConnection() throws NamingException, SQLException {



      InitialContext ic = new InitialContext();

      DataSource ds = (DataSource) ic.lookup(dbName);

      con =  ds.getConnection();

   }



   private void insertCustomer (String customerId, String salesRepId,

       String name) throws SQLException {



          String insertStatement =

                "insert into customer values ( ? , ? , ? )";

          PreparedStatement prepStmt = 

                con.prepareStatement(insertStatement);



          prepStmt.setString(1, customerId);

          prepStmt.setString(2, salesRepId);

          prepStmt.setString(3, name);



          prepStmt.executeUpdate();

          prepStmt.close();

   }



   private boolean selectByPrimaryKey(String primaryKey) 

      throws SQLException {



      String selectStatement =

            "select customerid " +

            "from customer where customerid = ? ";

      PreparedStatement prepStmt =

            con.prepareStatement(selectStatement);

      prepStmt.setString(1, primaryKey);



      ResultSet rs = prepStmt.executeQuery();

      boolean result = rs.next();

      prepStmt.close();

      return result;

   }



   private Collection selectBySalesRep(String salesRepId) 

      throws SQLException {



      String selectStatement =

            "select customerid " +

            "from customer where salesrepid = ? ";

      PreparedStatement prepStmt = 

            con.prepareStatement(selectStatement);



      prepStmt.setString(1, salesRepId);

      ResultSet rs = prepStmt.executeQuery();

      ArrayList a = new ArrayList();



      while (rs.next()) {

         String id = rs.getString(1);

         a.add(id);

      }



      prepStmt.close();

      return a;

   }



   private void deleteCustomer(String customerId) throws SQLException {



      String deleteStatement =

            "delete from customer  " +

            "where customerid = ?";

      PreparedStatement prepStmt =

            con.prepareStatement(deleteStatement);



      prepStmt.setString(1, customerId);

      prepStmt.executeUpdate();

      prepStmt.close();

   }



   private void loadCustomer() throws SQLException {



      String selectStatement =

            "select customerid, salesRepid, name " +

            "from customer where customerid = ? ";

      PreparedStatement prepStmt = 

            con.prepareStatement(selectStatement);



      prepStmt.setString(1, customerId);



      ResultSet rs = prepStmt.executeQuery();



      if (rs.next()) {

         customerId = rs.getString(1);

         salesRepId = rs.getString(2);

         name = rs.getString(3);

         prepStmt.close();

      }

      else {

         prepStmt.close();

         throw new NoSuchEntityException("Row for customerId " + customerId +

            " not found in database.");

      }

   }



   private void storeCustomer() throws SQLException {



      System.out.println("entering storeCustomer");

      String updateStatement =

            "update customer " +

            "set salesRepid = ? , name = ? " +

            "where customerid = ?";

      PreparedStatement prepStmt = 

            con.prepareStatement(updateStatement);



      prepStmt.setString(1, salesRepId);

      prepStmt.setString(2, name);

      prepStmt.setString(3, customerId);

      int rowCount = prepStmt.executeUpdate();

      prepStmt.close();



      if (rowCount == 0) {

         throw new EJBException("Storing row for customerId " + 

            customerId + " failed.");

      }

      System.out.println("leaving storeCustomer");

   }



} // CustomerEJB