/**
* Returns <code>this</code> if this class implements the interface
*
* @param interfaces a Class defining an interface
* @return an object that implements the interface
* @throws java.sql.SQLExption if no object if found that implements the interface
*/
public final <T> T unwrap(java.lang.Class<T> interfaces) throws SQLException {
try {
if (getRealConnection().isClosed()) throw Util.noCurrentConnection();
// Derby does not implement non-standard methods on
// JDBC objects
try {
return interfaces.cast(this);
} catch (ClassCastException cce) {
throw Util.generateCsSQLException(SQLState.UNABLE_TO_UNWRAP, interfaces);
}
} catch (SQLException sqle) {
notifyException(sqle);
throw sqle;
}
}
/**
* Returns false unless <code>interfaces</code> is implemented
*
* @param interfaces a Class defining an interface.
* @return true if this implements the interface or directly or indirectly wraps an object that
* does.
* @throws java.sql.SQLException if an error occurs while determining whether this is a wrapper
* for an object with the given interface.
*/
public final boolean isWrapperFor(Class<?> interfaces) throws SQLException {
try {
if (getRealConnection().isClosed()) throw Util.noCurrentConnection();
return interfaces.isInstance(this);
} catch (SQLException sqle) {
notifyException(sqle);
throw sqle;
}
}
