content: package com.mchange.v2.c3p0.impl;
  
  import javax.sql.DataSource;
  
  import java.io.PrintWriter;
  import java.sql.Connection;
  import java.sql.SQLException;
  import java.sql.SQLFeatureNotSupportedException;
  import java.util.logging.Logger;
  
  public class PoolBackedDataSourceBase
          implements DataSource {
      @Override
      public Connection getConnection() throws SQLException {
          return null;
      }
  
      @Override
      public Connection getConnection(String username, String password) throws SQLException {
          return null;
      }
  
      @Override
      public <T> T unwrap(Class<T> iface) throws SQLException {
          return null;
      }
  
      @Override
      public boolean isWrapperFor(Class<?> iface) throws SQLException {
          return false;
      }
  
      @Override
      public PrintWriter getLogWriter() throws SQLException {
          return null;
      }
  
      @Override
      public void setLogWriter(PrintWriter out) throws SQLException {
      }
  
      @Override
      public void setLoginTimeout(int seconds) throws SQLException {
      }
  
      @Override
      public int getLoginTimeout() throws SQLException {
          return 0;
      }
  
      @Override
      public Logger getParentLogger() throws SQLFeatureNotSupportedException {
          return null;
      }
  }
  