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An extension for a JDBC database connection pool.
There is a newer version: 3.3.14
package com.techempower.data.jdbc;

import java.sql.*;
import java.util.*;
import java.util.concurrent.*;

/**
 * Mostly a pass-through to the real connection, except for close() and
 * isClosed() which ask the JdbcConnectionProfile instead. This allows the
 * existing pooling logic in JdbcConnectionProfile to be used, and prevents a
 * pooled connection from being closed accidentally.
 */
public class ConnectionWrapper
    implements Connection
{
  private JdbcConnectionProfile profile;
  private Connection connection;

  public ConnectionWrapper(JdbcConnectionProfile profile, Connection connection)
  {
    this.profile = profile;
    this.connection = connection;
  }

  @SuppressWarnings("unchecked")
  @Override
  public  T unwrap(Class iface) throws SQLException
  {
    return (T)connection;
  }

  @Override
  public boolean isWrapperFor(Class iface) throws SQLException
  {
    return iface.isInstance(connection);
  }

  @Override
  public Statement createStatement() throws SQLException
  {
    return connection.createStatement();
  }

  @Override
  public PreparedStatement prepareStatement(String sql) throws SQLException
  {
    return connection.prepareStatement(sql);
  }

  @Override
  public CallableStatement prepareCall(String sql) throws SQLException
  {
    return connection.prepareCall(sql);
  }

  @Override
  public String nativeSQL(String sql) throws SQLException
  {
    return connection.nativeSQL(sql);
  }

  @Override
  public void setAutoCommit(boolean autoCommit) throws SQLException
  {
    connection.setAutoCommit(autoCommit);
  }

  @Override
  public boolean getAutoCommit() throws SQLException
  {
    return connection.getAutoCommit();
  }

  @Override
  public void commit() throws SQLException
  {
    connection.commit();
  }

  @Override
  public void rollback() throws SQLException
  {
    connection.rollback();
  }

  @Override
  public void close() throws SQLException
  {
    this.profile.close();
  }

  public void closeUnderlyingConnection() throws SQLException
  {
    connection.close();
  }

  @Override
  public boolean isClosed() throws SQLException
  {
    return this.profile.isClosed();
  }

  public boolean isClosedUnderlyingConnection() throws SQLException
  {
    return connection.isClosed();
  }

  @Override
  public DatabaseMetaData getMetaData() throws SQLException
  {
    return connection.getMetaData();
  }

  @Override
  public void setReadOnly(boolean readOnly) throws SQLException
  {
    connection.setReadOnly(readOnly);
  }

  @Override
  public boolean isReadOnly() throws SQLException
  {
    return connection.isReadOnly();
  }

  @Override
  public void setCatalog(String catalog) throws SQLException
  {
    connection.setCatalog(catalog);
  }

  @Override
  public String getCatalog() throws SQLException
  {
    return connection.getCatalog();
  }

  @Override
  public void setTransactionIsolation(int level) throws SQLException
  {
    connection.setTransactionIsolation(level);
  }

  @Override
  public int getTransactionIsolation() throws SQLException
  {
    return connection.getTransactionIsolation();
  }

  @Override
  public SQLWarning getWarnings() throws SQLException
  {
    return connection.getWarnings();
  }

  @Override
  public void clearWarnings() throws SQLException
  {
    connection.clearWarnings();
  }

  @Override
  public Statement createStatement(int resultSetType,
      int resultSetConcurrency) throws SQLException
  {
    return connection.createStatement(resultSetType, resultSetConcurrency);
  }

  @Override
  public PreparedStatement prepareStatement(String sql, int resultSetType,
      int resultSetConcurrency) throws SQLException
  {
    return connection.prepareStatement(sql, resultSetType, resultSetConcurrency);
  }

  @Override
  public CallableStatement prepareCall(String sql, int resultSetType,
      int resultSetConcurrency) throws SQLException
  {
    return connection.prepareCall(sql, resultSetType, resultSetConcurrency);
  }

  @Override
  public Map> getTypeMap() throws SQLException
  {
    return connection.getTypeMap();
  }

  @Override
  public void setTypeMap(Map> map) throws SQLException
  {
    connection.setTypeMap(map);
  }

  @Override
  public void setHoldability(int holdability) throws SQLException
  {
    connection.setHoldability(holdability);
  }

  @Override
  public int getHoldability() throws SQLException
  {
    return connection.getHoldability();
  }

  @Override
  public Savepoint setSavepoint() throws SQLException
  {
    return connection.setSavepoint();
  }

  @Override
  public Savepoint setSavepoint(String name) throws SQLException
  {
    return connection.setSavepoint(name);
  }

  @Override
  public void rollback(Savepoint savepoint) throws SQLException
  {
    connection.rollback(savepoint);
  }

  @Override
  public void releaseSavepoint(Savepoint savepoint) throws SQLException
  {
    connection.releaseSavepoint(savepoint);
  }

  @Override
  public Statement createStatement(int resultSetType,
      int resultSetConcurrency, int resultSetHoldability) throws SQLException
  {
    return connection.createStatement(resultSetType, resultSetConcurrency, resultSetHoldability);
  }

  @Override
  public PreparedStatement prepareStatement(String sql, int resultSetType,
      int resultSetConcurrency, int resultSetHoldability) throws SQLException
  {
    return connection.prepareStatement(sql, resultSetType, resultSetConcurrency, resultSetHoldability);
  }

  @Override
  public CallableStatement prepareCall(String sql, int resultSetType,
      int resultSetConcurrency, int resultSetHoldability) throws SQLException
  {
    return connection.prepareCall(sql, resultSetType, resultSetConcurrency, resultSetHoldability);
  }

  @Override
  public PreparedStatement prepareStatement(String sql, int autoGeneratedKeys)
      throws SQLException
  {
    return connection.prepareStatement(sql, autoGeneratedKeys);
  }

  @Override
  public PreparedStatement prepareStatement(String sql, int[] columnIndexes)
      throws SQLException
  {
    return connection.prepareStatement(sql, columnIndexes);
  }

  @Override
  public PreparedStatement prepareStatement(String sql, String[] columnNames)
      throws SQLException
  {
    return connection.prepareStatement(sql, columnNames);
  }

  @Override
  public Clob createClob() throws SQLException
  {
    return connection.createClob();
  }

  @Override
  public Blob createBlob() throws SQLException
  {
    return connection.createBlob();
  }

  @Override
  public NClob createNClob() throws SQLException
  {
    return connection.createNClob();
  }

  @Override
  public SQLXML createSQLXML() throws SQLException
  {
    return connection.createSQLXML();
  }

  @Override
  public boolean isValid(int timeout) throws SQLException
  {
    return connection.isValid(timeout);
  }

  @Override
  public void setClientInfo(String name, String value)
      throws SQLClientInfoException
  {
    connection.setClientInfo(name, value);
  }

  @Override
  public void setClientInfo(Properties properties)
      throws SQLClientInfoException
  {
    connection.setClientInfo(properties);
  }

  @Override
  public String getClientInfo(String name) throws SQLException
  {
    return connection.getClientInfo(name);
  }

  @Override
  public Properties getClientInfo() throws SQLException
  {
    return connection.getClientInfo();
  }

  @Override
  public Array createArrayOf(String typeName, Object[] elements)
      throws SQLException
  {
    return connection.createArrayOf(typeName, elements);
  }

  @Override
  public Struct createStruct(String typeName, Object[] attributes)
      throws SQLException
  {
    return connection.createStruct(typeName, attributes);
  }

  @Override
  public void setSchema(String schema) throws SQLException
  {
    connection.setSchema(schema);
  }

  @Override
  public String getSchema() throws SQLException
  {
    return connection.getSchema();
  }

  @Override
  public void abort(Executor executor) throws SQLException
  {
    connection.abort(executor);
  }

  @Override
  public void setNetworkTimeout(Executor executor, int milliseconds)
      throws SQLException
  {
    connection.setNetworkTimeout(executor, milliseconds);
  }

  @Override
  public int getNetworkTimeout() throws SQLException
  {
    return connection.getNetworkTimeout();
  }

}