contract WithRules is IWithRules, Ownable {

  IRule[] internal rules;

  /**
   * @dev Constructor
   */
  constructor(IRule[] _rules) public {
    rules = _rules;
  }

  /**
   * @dev Returns the number of rules
   */
  function ruleLength() public view returns (uint256) {
    return rules.length;
  }

  /**
   * @dev Returns the Rule associated to the specified ruleId
   */
  function rule(uint256 _ruleId) public view returns (IRule) {
    return rules[_ruleId];
  }

  /**
   * @dev Check if the rules are valid for an address
   */
  function validateAddress(address _address) public view returns (bool) {
    for (uint256 i = 0; i < rules.length; i++) {
      if (!rules[i].isAddressValid(_address)) {
        return false;
      }
    }
    return true;
  }

  /**
   * @dev Check if the rules are valid
   */
  function validateTransfer(address _from, address _to, uint256 _amount)
    public view returns (bool)
  {
    for (uint256 i = 0; i < rules.length; i++) {
      if (!rules[i].isTransferValid(_from, _to, _amount)) {
        return false;
      }
    }
    return true;
  }

  /**
   * @dev Modifier to make functions callable
   * only when participants follow rules
   */
  modifier whenAddressRulesAreValid(address _address) {
    require(validateAddress(_address), "WR01");
    _;
  }

  /**
   * @dev Modifier to make transfer functions callable
   * only when participants follow rules
   */
  modifier whenTransferRulesAreValid(
    address _from,
    address _to,
    uint256 _amount)
  {
    require(validateTransfer(_from, _to, _amount), "WR02");
    _;
  }

  /**
   * @dev Define rules to the token
   */
  function defineRules(IRule[] _rules) public onlyOwner {
    rules = _rules;
    emit RulesDefined(rules.length);
  }
}
/**
 * @title WithRules
 * @dev WithRules contract allows inheriting contract to use a set of validation rules
 * @dev contract owner may add or remove rules
 *
 * @author Cyril Lapinte - <cyril.lapinte@mtpelerin.com>
 *
 * @notice Copyright © 2016 - 2018 Mt Pelerin Group SA - All Rights Reserved
 * @notice Please refer to the top of this file for the license.
 *
 * Error messages
 * WR01: The rules rejected this address
 * WR02: The rules rejected the transfer
 **/
function rule(uint256 _ruleId) public view returns (IRule) {
  return rules[_ruleId];
}

/**
 * @dev Returns the Rule associated to the specified ruleId
 */