DAOFactory


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37  
38  package com.sun.j2ee.blueprints.util.dao;
39  
40  import javax.naming.NamingException  ;
41  import javax.naming.InitialContext  ;
42  
43  public class DAOFactory {
44  
45      /**
46       * This method instantiates the DAO class that is used in this
47       * applications deployment environment to access the data. 
48       * @param daoEnvEntry The env-entry in the deployment descriptor
49       * that contains the name of the class corresponding to
50       * which DAO to instantiate.
51       *
52       * @throws DAOSystemException if it has system error looking up 
53       *         the DAO class name in the env-entry.
54       */
55      public static Object   getDAO(String   daoEnvEntry) throws DAOSystemException {
56          try {
57              InitialContext   ic = new InitialContext  ();
58              String   className = (String  ) ic.lookup(daoEnvEntry);
59              return Class.forName(className).newInstance();
60          } catch (NamingException   ne) {
61              throw new DAOSystemException("DAOFactory.getDAO(" + daoEnvEntry +"):  NamingException while getting DAO type : \n" + ne.getMessage());
62          } catch (Exception   se) {
63              throw new DAOSystemException("DAOFactory.getDAO(" + daoEnvEntry +"):  Exception while getting DAO type : \n" + se.getMessage());
64          }
65      }
66  }
67
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