Examples of org.olap4j.OlapWrapper

org.olap4j.OlapWrapper
Interface for olap4j classes which provide the ability to retrieve the delegate instance when the instance in question is in fact a proxy class.
OlapWrapper duplicates the functionality of the java.sql.Wrapper interface (introduced in JDBC 4.0), making this functionality available to olap4j clients running in a JDBC 3.0 environment. For code which will run only on JDBC 4.0 and later, Wrapper can be used, and OlapWrapper can be ignored.

In JDBC 3.0 (JDK 1.5) and earlier, the OlapWrapper interface is used to convert a JDBC class to the corresponding olap4j class. For instance, write
```
 import java.sql.Connection; import java.sql.DriverManager; import org.olap4j.OlapConnection; import org.olap4j.OlapWrapper; Connection connection = DriverManager.getConnection("jdbc: ..."); OlapWrapper wrapper = (OlapWrapper) connection; OlapConnection olapConnection = wrapper.unwrap(OlapConnection.class); 
```
to create a JDBC 3.0 connection and convert it to an olap4j connection.
In JDBC 4.0 (JDK 1.6) and later, you don't need to use this class. All of the key JDBC classes implement java.sql.Wrapper interface, so you can use its isWrapper and unwrap methods without casting. For instance, write
```
 import java.sql.Connection; import java.sql.DriverManager; import org.olap4j.OlapConnection; Connection connection = DriverManager.getConnection("jdbc: ..."); OlapConnection olapConnection = connection.unwrap(OlapConnection.class); 
```
to create a JDBC 4.0 connection and convert it to an olap4j connection. @author jhyde @version $Id: OlapWrapper.java 315 2010-05-29 00:56:11Z jhyde $ @since Jun 14, 2007

      return new OlapQueryExecution(command, unwrap(connection), executionContext, this);
  }    


  private OlapConnection unwrap(Connection conn) throws TranslatorException {
      try {
        OlapWrapper wrapper = conn.unwrap(OlapWrapper.class);
        OlapConnection olapConn = wrapper.unwrap(OlapConnection.class);
        return olapConn;
      } catch(SQLException e) {
        throw new TranslatorException(e);
      }    
  }

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                + "User='admin';"
                + "Password='admin';"
                + "Catalog=FoodMart2005Palo;"
                + "Cube=Budget");


        OlapWrapper wrapper = (OlapWrapper) connection;


        OlapConnection olapConnection = wrapper.unwrap(OlapConnection.class);


        OlapStatement statement = olapConnection.createStatement();


        CellSet cellSet =
            statement.executeOlapQuery(

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    {
      return (OlapConnection) connection;
    }
    if (connection instanceof OlapWrapper)
    {
      final OlapWrapper wrapper = (OlapWrapper) connection;
      return wrapper.unwrap(OlapConnection.class);
    }
    throw new SQLException("Unable to unwrap the connection: " + driver); //$NON-NLS-1$
  }

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        {
          return (OlapConnection) connection;
        }
        if (connection instanceof OlapWrapper)
        {
          final OlapWrapper wrapper = (OlapWrapper) connection;
          return wrapper.unwrap(OlapConnection.class);
        }
        throw new SQLException("Unable to unwrap the connection: " + connectionPath); //$NON-NLS-1$
      }


      final Connection connection = ds.getConnection(realUser, realPassword);
      if (connection == null)
      {
        throw new SQLException("JNDI DataSource is invalid; it returned null without throwing a meaningful error.");
      }
      if (connection instanceof OlapConnection)
      {
        return (OlapConnection) connection;
      }
      if (connection instanceof OlapWrapper)
      {
        final OlapWrapper wrapper = (OlapWrapper) connection;
        return wrapper.unwrap(OlapConnection.class);
      }
      throw new SQLException("Unable to unwrap the connection: " + connectionPath); //$NON-NLS-1$
    }
    catch (NamingException ne)
    {

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        {
          return (OlapConnection) connection;
        }
        if (connection instanceof OlapWrapper)
        {
          final OlapWrapper wrapper = (OlapWrapper) connection;
          return wrapper.unwrap(OlapConnection.class);
        }
        throw new SQLException("Unable to unwrap the connection: " + connectionPath); //$NON-NLS-1$
      }


      final Connection connection = ds.getConnection(realUser, realPassword);
      if (connection == null)
      {
        throw new SQLException("JNDI DataSource is invalid; it returned null without throwing a meaningful error.");
      }
      if (connection instanceof OlapConnection)
      {
        return (OlapConnection) connection;
      }
      if (connection instanceof OlapWrapper)
      {
        final OlapWrapper wrapper = (OlapWrapper) connection;
        return wrapper.unwrap(OlapConnection.class);
      }


      return connection.unwrap(OlapConnection.class);
    }
    catch (DatasourceServiceException ne)

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    {
      return (OlapConnection) connection;
    }
    if (connection instanceof OlapWrapper)
    {
      final OlapWrapper wrapper = (OlapWrapper) connection;
      final OlapConnection olapConnection = wrapper.unwrap(OlapConnection.class);
      if (olapConnection == null)
      {
        throw new SQLException("Unable to unwrap the connection: " + driver); //$NON-NLS-1$
      }
      return olapConnection;

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      } else {
        connection = (OlapConnection) DriverManager.getConnection(
            connectStr, username, password);
      }


      final OlapWrapper wrapper = connection;


      final OlapConnection olapConnection = wrapper
          .unwrap(OlapConnection.class);


      if (olapConnection == null) {
        throw new OlapException("Services.Session.NullConnection"); //$NON-NLS-1$
      } else {

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    Class.forName(driver);
    Connection object = DriverManager.getConnection(url, username, password);
    OlapConnection connection;
    connection = (OlapConnection) DriverManager.getConnection(url, username, password);
    final OlapWrapper wrapper = connection;
    OlapConnection tmpolapConnection = wrapper.unwrap(OlapConnection.class);




    if (tmpolapConnection == null) {
      throw new Exception("Connection is null");
    }

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            // ignore
        } catch (IllegalAccessException e) {
            // ignore
        }
        if (connection instanceof OlapWrapper) {
            OlapWrapper olapWrapper = (OlapWrapper) connection;
            return olapWrapper.unwrap(clazz);
        }
        throw new SQLException("not an instance");
    }

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