import javax.sql.*;
import com.mchange.v2.c3p0.*;
import com.mchange.v2.c3p0.impl.AbstractPoolBackedDataSource;

DataSource ds = ...; //your c3p0 PooledDataSource
if ( ds instanceof ComboPooledDataSource )
  {
      // NORMAL CASE #1

      ComboPooledDataSource cpds = (ComboPooledDataSource) ds;
      ...

      // cpds has direct accessors for all config properties, check out
      // the api docs for ComboPooledDataSource
  }
else if (ds instanceof AbstractPoolBackedDataSource)
{
     AbstractPoolBackedDataSource apbds = (AbstractPoolBackedDataSource) ds;
     ConnectionPoolDataSource cpds = apbds.getConnectionPoolDataSource();
    if (cpds instanceof WrapperConnectionPoolDataSource)
    {
        // NORMAL CASE #2

        WrapperConnectionPoolDataSource wcpds = (WrapperConnectionPoolDataSource) cpds;
        ...
      // cpds has direct accessors for most config properties, check out
      // the api docs for WrapperConnectionPoolDataSource
    }
    else
    {
       // unusal -- you build a c3p0 PooledDataSource using your
       // own ConnectionPoolDataSource implementation. You'd
       // know it if you did this. c3p0-specific config properties are
       // almost certainly the documented defaults. (If this is your
       // situation -- very unlikely -- then ask, and I'll explain in
       // more detail.
    }
  }
else
  {
      // not a c3p0-0.9.1-defined implementation
  }