Adapter Pattern

Question

Hello All,
I am trying to implement the GOF Adapter Pattern and I have the following classes. The purpose is to read the database name from a properties file and instantiate the correct database class. For example if the properties file reads
database.vendor=OracleDatabase
then the code should instantiate the OracleDatabase class file and invoke methods on that. Here is some of the code that I have written but I don't seem to put it all together. Any help will be greatly appreciated.
1) Interface (IDatabaseAdapter):
<code>
public interface IDatabaseAdapter
public String getDatabase(String fileName);
</code>
2) ConnectionFactory (implements IDatabaseAdapter)
<code>
import java.io.*;
import java.sql.*;
import java.util.*;
public class ConnectionFactory implements IDatabaseAdapter
private IDatabaseAdapter ida;
private static ConnectionFactory instance = null;
private static String fileName = "dbvendor.properties";
private String vendorName = "";
public String getDatabase(String fileName)
try
Properties props = new Properties();
props.load(new FileInputStream(fileName));
vendorName = props.getProperty("database.vendor");
System.out.println("DB Vendor: "+vendorName);
return vendorName;
catch(MissingResourceException e) {
System.err.println("Missing Resource: " + e.getMessage());
return null;
catch (FileNotFoundException fnfe)
fnfe.printStackTrace();
return null;
catch (IOException ioe)
ioe.printStackTrace();
return null;
public static synchronized ConnectionFactory getInstance()
if (instance == null)
instance = new ConnectionFactory();
return instance;
public IDatabaseAdapter getDatabaseAdapter(String fileName)
try
if (ida == null)
ida = (IDatabaseAdapter)Class.forName(getDatabase(fileName)).newInstance();
System.out.println("Calling "+getDatabase(fileName)+" instance");
return ida;
catch (Exception e)
e.printStackTrace();
return ida;
</code>
3) I need to use this in the code now, something like this:
cached = new CachedConnection(<get the name from the Adapters>.getConnection(bindName))
Any other suggestions will be helpful.
Thanks

Answer 1

Any other suggestions will be helpful.Here are a couple of suggestions:
1) Ask a direct, precise question, rather than just posting bare minimum skeleton code and asking others to fill it in for you.
2) [code] and[/code], not <code> and <code>