openzeppelin-contracts/contracts/crowdsale/FinalizableCrowdsale.sol

pragma solidity ^0.4.11;

import '../math/SafeMath.sol';
import '../ownership/Ownable.sol';
import './Crowdsale.sol';

/**
 * @title FinalizableCrowdsale
 * @dev Extension of Crowsdale where an owner can do extra work
 * after finishing. By default, it will end token minting.
 */
contract FinalizableCrowdsale is Crowdsale, Ownable {
  using SafeMath for uint256;

  bool public isFinalized = false;

  event Finalized();

  // should be called after crowdsale ends, to do
  // some extra finalization work
  function finalize() onlyOwner {
    require(!isFinalized);
    require(hasEnded());

    finalization();
    Finalized();
    
    isFinalized = true;
  }

  // end token minting on finalization
  // override this with custom logic if needed
  function finalization() internal {
    token.finishMinting();
  }



}