creation_sourcecode: // File: contracts\SWC.sol
  
  pragma solidity ^0.5.0;
  
  // File: node_modules\openzeppelin-solidity\contracts\token\ERC20\IERC20.sol
  
  /**
   * @dev Interface of the ERC20 standard as defined in the EIP. Does not include
   * the optional functions; to access them see `ERC20Detailed`.
   */
  interface IERC20 {
      /**
       * @dev Returns the amount of tokens in existence.
       */
      function totalSupply() external view returns (uint256);
  
      /**
       * @dev Returns the amount of tokens owned by `account`.
       */
      function balanceOf(address account) external view returns (uint256);
  
      /**
       * @dev Moves `amount` tokens from the caller's account to `recipient`.
       *
       * Returns a boolean value indicating whether the operation succeeded.
       *
       * Emits a `Transfer` event.
       */
      function transfer(address recipient, uint256 amount) external returns (bool);
  
      /**
       * @dev Returns the remaining number of tokens that `spender` will be
       * allowed to spend on behalf of `owner` through `transferFrom`. This is
       * zero by default.
       *
       * This value changes when `approve` or `transferFrom` are called.
       */
      function allowance(address owner, address spender) external view returns (uint256);
  
      /**
       * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
       *
       * Returns a boolean value indicating whether the operation succeeded.
       *
       * > Beware that changing an allowance with this method brings the risk
       * that someone may use both the old and the new allowance by unfortunate
       * transaction ordering. One possible solution to mitigate this race
       * condition is to first reduce the spender's allowance to 0 and set the
       * desired value afterwards:
       * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
       *
       * Emits an `Approval` event.
       */
      function approve(address spender, uint256 amount) external returns (bool);
  
      /**
       * @dev Moves `amount` tokens from `sender` to `recipient` using the
       * allowance mechanism. `amount` is then deducted from the caller's
       * allowance.
       *
       * Returns a boolean value indicating whether the operation succeeded.
       *
       * Emits a `Transfer` event.
       */
      function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);
  
      /**
       * @dev Emitted when `value` tokens are moved from one account (`from`) to
       * another (`to`).
       *
       * Note that `value` may be zero.
       */
      event Transfer(address indexed from, address indexed to, uint256 value);
  
      /**
       * @dev Emitted when the allowance of a `spender` for an `owner` is set by
       * a call to `approve`. `value` is the new allowance.
       */
      event Approval(address indexed owner, address indexed spender, uint256 value);
  }
  
  // File: node_modules\openzeppelin-solidity\contracts\math\SafeMath.sol
  
  /**
   * @dev Wrappers over Solidity's arithmetic operations with added overflow
   * checks.
   *
   * Arithmetic operations in Solidity wrap on overflow. This can easily result
   * in bugs, because programmers usually assume that an overflow raises an
   * error, which is the standard behavior in high level programming languages.
   * `SafeMath` restores this intuition by reverting the transaction when an
   * operation overflows.
   *
   * Using this library instead of the unchecked operations eliminates an entire
   * class of bugs, so it's recommended to use it always.
   */
  library SafeMath {
      /**
       * @dev Returns the addition of two unsigned integers, reverting on
       * overflow.
       *
       * Counterpart to Solidity's `+` operator.
       *
       * Requirements:
       * - Addition cannot overflow.
       */
      function add(uint256 a, uint256 b) internal pure returns (uint256) {
          uint256 c = a + b;
          require(c >= a, "SafeMath: addition overflow");
  
          return c;
      }
  
      /**
       * @dev Returns the subtraction of two unsigned integers, reverting on
       * overflow (when the result is negative).
       *
       * Counterpart to Solidity's `-` operator.
       *
       * Requirements:
       * - Subtraction cannot overflow.
       */
      function sub(uint256 a, uint256 b) internal pure returns (uint256) {
          require(b <= a, "SafeMath: subtraction overflow");
          uint256 c = a - b;
  
          return c;
      }
  
      /**
       * @dev Returns the multiplication of two unsigned integers, reverting on
       * overflow.
       *
       * Counterpart to Solidity's `*` operator.
       *
       * Requirements:
       * - Multiplication cannot overflow.
       */
      function mul(uint256 a, uint256 b) internal pure returns (uint256) {
          // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
          // benefit is lost if 'b' is also tested.
          // See: https://github.com/OpenZeppelin/openzeppelin-solidity/pull/522
          if (a == 0) {
              return 0;
          }
  
          uint256 c = a * b;
          require(c / a == b, "SafeMath: multiplication overflow");
  
          return c;
      }
  
      /**
       * @dev Returns the integer division of two unsigned integers. Reverts on
       * division by zero. The result is rounded towards zero.
       *
       * Counterpart to Solidity's `/` operator. Note: this function uses a
       * `revert` opcode (which leaves remaining gas untouched) while Solidity
       * uses an invalid opcode to revert (consuming all remaining gas).
       *
       * Requirements:
       * - The divisor cannot be zero.
       */
      function div(uint256 a, uint256 b) internal pure returns (uint256) {
          // Solidity only automatically asserts when dividing by 0
          require(b > 0, "SafeMath: division by zero");
          uint256 c = a / b;
          // assert(a == b * c + a % b); // There is no case in which this doesn't hold
  
          return c;
      }
  
      /**
       * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
       * Reverts when dividing by zero.
       *
       * Counterpart to Solidity's `%` operator. This function uses a `revert`
       * opcode (which leaves remaining gas untouched) while Solidity uses an
       * invalid opcode to revert (consuming all remaining gas).
       *
       * Requirements:
       * - The divisor cannot be zero.
       */
      function mod(uint256 a, uint256 b) internal pure returns (uint256) {
          require(b != 0, "SafeMath: modulo by zero");
          return a % b;
      }
  }
  
  // File: node_modules\openzeppelin-solidity\contracts\token\ERC20\ERC20.sol
  
  /**
   * @dev Implementation of the `IERC20` interface.
   *
   * This implementation is agnostic to the way tokens are created. This means
   * that a supply mechanism has to be added in a derived contract using `_mint`.
   * For a generic mechanism see `ERC20Mintable`.
   *
   * *For a detailed writeup see our guide [How to implement supply
   * mechanisms](https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226).*
   *
   * We have followed general OpenZeppelin guidelines: functions revert instead
   * of returning `false` on failure. This behavior is nonetheless conventional
   * and does not conflict with the expectations of ERC20 applications.
   *
   * Additionally, an `Approval` event is emitted on calls to `transferFrom`.
   * This allows applications to reconstruct the allowance for all accounts just
   * by listening to said events. Other implementations of the EIP may not emit
   * these events, as it isn't required by the specification.
   *
   * Finally, the non-standard `decreaseAllowance` and `increaseAllowance`
   * functions have been added to mitigate the well-known issues around setting
   * allowances. See `IERC20.approve`.
   */
  contract ERC20 is IERC20 {
      using SafeMath for uint256;
  
      mapping (address => uint256) internal _balances;
  
      mapping (address => mapping (address => uint256)) private _allowances;
  
      uint256 private _totalSupply;
  
      /**
       * @dev See `IERC20.totalSupply`.
       */
      function totalSupply() public view returns (uint256) {
          return _totalSupply;
      }
  
      /**
       * @dev See `IERC20.balanceOf`.
       */
      function balanceOf(address account) public view returns (uint256) {
          return _balances[account];
      }
  
      /**
       * @dev See `IERC20.transfer`.
       *
       * Requirements:
       *
       * - `recipient` cannot be the zero address.
       * - the caller must have a balance of at least `amount`.
       */
      function transfer(address recipient, uint256 amount) public returns (bool) {
          _transfer(msg.sender, recipient, amount);
          return true;
      }
  
      /**
       * @dev See `IERC20.allowance`.
       */
      function allowance(address owner, address spender) public view returns (uint256) {
          return _allowances[owner][spender];
      }
  
      /**
       * @dev See `IERC20.approve`.
       *
       * Requirements:
       *
       * - `spender` cannot be the zero address.
       */
      function approve(address spender, uint256 value) public returns (bool) {
          _approve(msg.sender, spender, value);
          return true;
      }
  
      /**
       * @dev See `IERC20.transferFrom`.
       *
       * Emits an `Approval` event indicating the updated allowance. This is not
       * required by the EIP. See the note at the beginning of `ERC20`;
       *
       * Requirements:
       * - `sender` and `recipient` cannot be the zero address.
       * - `sender` must have a balance of at least `value`.
       * - the caller must have allowance for `sender`'s tokens of at least
       * `amount`.
       */
      function transferFrom(address sender, address recipient, uint256 amount) public returns (bool) {
          _transfer(sender, recipient, amount);
          _approve(sender, msg.sender, _allowances[sender][msg.sender].sub(amount));
          return true;
      }
  
      /**
       * @dev Atomically increases the allowance granted to `spender` by the caller.
       *
       * This is an alternative to `approve` that can be used as a mitigation for
       * problems described in `IERC20.approve`.
       *
       * Emits an `Approval` event indicating the updated allowance.
       *
       * Requirements:
       *
       * - `spender` cannot be the zero address.
       */
      function increaseAllowance(address spender, uint256 addedValue) public returns (bool) {
          _approve(msg.sender, spender, _allowances[msg.sender][spender].add(addedValue));
          return true;
      }
  
      /**
       * @dev Atomically decreases the allowance granted to `spender` by the caller.
       *
       * This is an alternative to `approve` that can be used as a mitigation for
       * problems described in `IERC20.approve`.
       *
       * Emits an `Approval` event indicating the updated allowance.
       *
       * Requirements:
       *
       * - `spender` cannot be the zero address.
       * - `spender` must have allowance for the caller of at least
       * `subtractedValue`.
       */
      function decreaseAllowance(address spender, uint256 subtractedValue) public returns (bool) {
          _approve(msg.sender, spender, _allowances[msg.sender][spender].sub(subtractedValue));
          return true;
      }
  
      /**
       * @dev Moves tokens `amount` from `sender` to `recipient`.
       *
       * This is internal function is equivalent to `transfer`, and can be used to
       * e.g. implement automatic token fees, slashing mechanisms, etc.
       *
       * Emits a `Transfer` event.
       *
       * Requirements:
       *
       * - `sender` cannot be the zero address.
       * - `recipient` cannot be the zero address.
       * - `sender` must have a balance of at least `amount`.
       */
      function _transfer(address sender, address recipient, uint256 amount) internal {
          require(sender != address(0), "ERC20: transfer from the zero address");
          require(recipient != address(0), "ERC20: transfer to the zero address");
  
          _balances[sender] = _balances[sender].sub(amount);
          _balances[recipient] = _balances[recipient].add(amount);
          emit Transfer(sender, recipient, amount);
      }
  
      /** @dev Creates `amount` tokens and assigns them to `account`, increasing
       * the total supply.
       *
       * Emits a `Transfer` event with `from` set to the zero address.
       *
       * Requirements
       *
       * - `to` cannot be the zero address.
       */
      function _mint(address account, uint256 amount) internal {
          require(account != address(0), "ERC20: mint to the zero address");
  
          _totalSupply = _totalSupply.add(amount);
          _balances[account] = _balances[account].add(amount);
          emit Transfer(address(0), account, amount);
      }
  
       /**
       * @dev Destoys `amount` tokens from `account`, reducing the
       * total supply.
       *
       * Emits a `Transfer` event with `to` set to the zero address.
       *
       * Requirements
       *
       * - `account` cannot be the zero address.
       * - `account` must have at least `amount` tokens.
       */
      function _burn(address account, uint256 value) internal {
          require(account != address(0), "ERC20: burn from the zero address");
  
          _totalSupply = _totalSupply.sub(value);
          _balances[account] = _balances[account].sub(value);
          emit Transfer(account, address(0), value);
      }
  
      /**
       * @dev Sets `amount` as the allowance of `spender` over the `owner`s tokens.
       *
       * This is internal function is equivalent to `approve`, and can be used to
       * e.g. set automatic allowances for certain subsystems, etc.
       *
       * Emits an `Approval` event.
       *
       * Requirements:
       *
       * - `owner` cannot be the zero address.
       * - `spender` cannot be the zero address.
       */
      function _approve(address owner, address spender, uint256 value) internal {
          require(owner != address(0), "ERC20: approve from the zero address");
          require(spender != address(0), "ERC20: approve to the zero address");
  
          _allowances[owner][spender] = value;
          emit Approval(owner, spender, value);
      }
  
      /**
       * @dev Destoys `amount` tokens from `account`.`amount` is then deducted
       * from the caller's allowance.
       *
       * See `_burn` and `_approve`.
       */
      function _burnFrom(address account, uint256 amount) internal {
          _burn(account, amount);
          _approve(account, msg.sender, _allowances[account][msg.sender].sub(amount));
      }
  }
  
  // File: contracts\SWC.sol
  
  contract SWC is ERC20 {
      string public constant name = "Swap Coin"; 
      string public constant symbol = "SWC"; 
      uint8 public constant decimals = 18; 
      uint256 public constant initialSupply = 100000000 * (10 ** uint256(decimals));
      
      constructor() public {
          super._mint(msg.sender, initialSupply);
          owner = msg.sender;
      }
  
      //ownership
      address public owner;
  
      event OwnershipRenounced(address indexed previousOwner);
      event OwnershipTransferred(
      address indexed previousOwner,
      address indexed newOwner
      );
  
      modifier onlyOwner() {
          require(msg.sender == owner, "Not owner");
          _;
      }
  
    /**
     * @dev Allows the current owner to relinquish control of the contract.
     * @notice Renouncing to ownership will leave the contract without an owner.
     * It will not be possible to call the functions with the `onlyOwner`
     * modifier anymore.
     */
      function renounceOwnership() public onlyOwner {
          emit OwnershipRenounced(owner);
          owner = address(0);
      }
  
    /**
     * @dev Allows the current owner to transfer control of the contract to a newOwner.
     * @param _newOwner The address to transfer ownership to.
     */
      function transferOwnership(address _newOwner) public onlyOwner {
          _transferOwnership(_newOwner);
      }
  
    /**
     * @dev Transfers control of the contract to a newOwner.
     * @param _newOwner The address to transfer ownership to.
     */
      function _transferOwnership(address _newOwner) internal {
          require(_newOwner != address(0), "Already owner");
          emit OwnershipTransferred(owner, _newOwner);
          owner = _newOwner;
      }
  
      //pausable
      event Pause();
      event Unpause();
  
      bool public paused = false;
      
      /**
      * @dev Modifier to make a function callable only when the contract is not paused.
      */
      modifier whenNotPaused() {
          require(!paused, "Paused by owner");
          _;
      }
  
      /**
      * @dev Modifier to make a function callable only when the contract is paused.
      */
      modifier whenPaused() {
          require(paused, "Not paused now");
          _;
      }
  
      /**
      * @dev called by the owner to pause, triggers stopped state
      */
      function pause() public onlyOwner whenNotPaused {
          paused = true;
          emit Pause();
      }
  
      /**
      * @dev called by the owner to unpause, returns to normal state
      */
      function unpause() public onlyOwner whenPaused {
          paused = false;
          emit Unpause();
      }
  
      //freezable
      event Frozen(address target);
      event Unfrozen(address target);
  
      mapping(address => bool) internal freezes;
  
      modifier whenNotFrozen() {
          require(!freezes[msg.sender], "Sender account is locked.");
          _;
      }
  
      function freeze(address _target) public onlyOwner {
          freezes[_target] = true;
          emit Frozen(_target);
      }
  
      function unfreeze(address _target) public onlyOwner {
          freezes[_target] = false;
          emit Unfrozen(_target);
      }
  
      function isFrozen(address _target) public view returns (bool) {
          return freezes[_target];
      }
  
      function transfer(
          address _to,
          uint256 _value
      )
        public
        whenNotFrozen
        whenNotPaused
        returns (bool)
      {
          releaseLock(msg.sender);
          return super.transfer(_to, _value);
      }
  
      function transferFrom(
          address _from,
          address _to,
          uint256 _value
      )
        public
        whenNotPaused
        returns (bool)
      {
          require(!freezes[_from], "From account is locked.");
          releaseLock(_from);
          return super.transferFrom(_from, _to, _value);
      }
  
      //mintable
      event Mint(address indexed to, uint256 amount);
  
      function mint(
          address _to,
          uint256 _amount
      )
        public
        onlyOwner
        returns (bool)
      {
          super._mint(_to, _amount);
          emit Mint(_to, _amount);
          return true;
      }
  
      //burnable
      event Burn(address indexed burner, uint256 value);
  
      function burn(address _who, uint256 _value) public onlyOwner {
          require(_value <= super.balanceOf(_who), "Balance is too small.");
  
          _burn(_who, _value);
          emit Burn(_who, _value);
      }
  
      //lockable
      struct LockInfo {
          uint256 releaseTime;
          uint256 balance;
      }
      mapping(address => LockInfo[]) internal lockInfo;
  
      event Lock(address indexed holder, uint256 value, uint256 releaseTime);
      event Unlock(address indexed holder, uint256 value);
  
      function balanceOf(address _holder) public view returns (uint256 balance) {
          uint256 lockedBalance = 0;
          for(uint256 i = 0; i < lockInfo[_holder].length ; i++ ) {
              lockedBalance = lockedBalance.add(lockInfo[_holder][i].balance);
          }
          return super.balanceOf(_holder).add(lockedBalance);
      }
  
      function releaseLock(address _holder) internal {
  
          for(uint256 i = 0; i < lockInfo[_holder].length ; i++ ) {
              if (lockInfo[_holder][i].releaseTime <= now) {
                  _balances[_holder] = _balances[_holder].add(lockInfo[_holder][i].balance);
                  emit Unlock(_holder, lockInfo[_holder][i].balance);
                  lockInfo[_holder][i].balance = 0;
  
                  if (i != lockInfo[_holder].length - 1) {
                      lockInfo[_holder][i] = lockInfo[_holder][lockInfo[_holder].length - 1];
                      i--;
                  }
                  lockInfo[_holder].length--;
  
              }
          }
      }
      function lockCount(address _holder) public view returns (uint256) {
          return lockInfo[_holder].length;
      }
      function lockState(address _holder, uint256 _idx) public view returns (uint256, uint256) {
          return (lockInfo[_holder][_idx].releaseTime, lockInfo[_holder][_idx].balance);
      }
  
      function lock(address _holder, uint256 _amount, uint256 _releaseTime) public onlyOwner {
          require(super.balanceOf(_holder) >= _amount, "Balance is too small.");
          _balances[_holder] = _balances[_holder].sub(_amount);
          lockInfo[_holder].push(
              LockInfo(_releaseTime, _amount)
          );
          emit Lock(_holder, _amount, _releaseTime);
      }
  
      function lockAfter(address _holder, uint256 _amount, uint256 _afterTime) public onlyOwner {
          require(super.balanceOf(_holder) >= _amount, "Balance is too small.");
          _balances[_holder] = _balances[_holder].sub(_amount);
          lockInfo[_holder].push(
              LockInfo(now + _afterTime, _amount)
          );
          emit Lock(_holder, _amount, now + _afterTime);
      }
  
      function unlock(address _holder, uint256 i) public onlyOwner {
          require(i < lockInfo[_holder].length, "No lock information.");
  
          _balances[_holder] = _balances[_holder].add(lockInfo[_holder][i].balance);
          emit Unlock(_holder, lockInfo[_holder][i].balance);
          lockInfo[_holder][i].balance = 0;
  
          if (i != lockInfo[_holder].length - 1) {
              lockInfo[_holder][i] = lockInfo[_holder][lockInfo[_holder].length - 1];
          }
          lockInfo[_holder].length--;
      }
  
      function transferWithLock(address _to, uint256 _value, uint256 _releaseTime) public onlyOwner returns (bool) {
          require(_to != address(0), "wrong address");
          require(_value <= super.balanceOf(owner), "Not enough balance");
  
          _balances[owner] = _balances[owner].sub(_value);
          lockInfo[_to].push(
              LockInfo(_releaseTime, _value)
          );
          emit Transfer(owner, _to, _value);
          emit Lock(_to, _value, _releaseTime);
  
          return true;
      }
  
      function transferWithLockAfter(address _to, uint256 _value, uint256 _afterTime) public onlyOwner returns (bool) {
          require(_to != address(0), "wrong address");
          require(_value <= super.balanceOf(owner), "Not enough balance");
  
          _balances[owner] = _balances[owner].sub(_value);
          lockInfo[_to].push(
              LockInfo(now + _afterTime, _value)
          );
          emit Transfer(owner, _to, _value);
          emit Lock(_to, _value, now + _afterTime);
  
          return true;
      }
  
      function currentTime() public view returns (uint256) {
          return now;
      }
  
      function afterTime(uint256 _value) public view returns (uint256) {
          return now + _value;
      }
  }