pragma solidity ^0.4.24;



// ----------------------------------------------------------------------------

// @Name SafeMath

// @Desc Math operations with safety checks that throw on error

// https://github.com/OpenZeppelin/zeppelin-solidity/blob/master/contracts/math/SafeMath.sol

// ----------------------------------------------------------------------------

library SafeMath {

    

    function mul(uint256 a, uint256 b) internal pure returns (uint256) {

        if (a == 0) {

            return 0;

        }

        uint256 c = a * b;

        assert(c / a == b);

        return c;

    }



    function div(uint256 a, uint256 b) internal pure returns (uint256) {

        return a / b;

    }



    function sub(uint256 a, uint256 b) internal pure returns (uint256) {

        assert(b <= a);

        return a - b;

    }



    function add(uint256 a, uint256 b) internal pure returns (uint256) {

        uint256 c = a + b;

        assert(c >= a);

        return c;

    }

}

// ----------------------------------------------------------------------------

// @title ERC20Basic

// @dev Simpler version of ERC20 interface

// See https://github.com/ethereum/EIPs/issues/179

// ----------------------------------------------------------------------------

contract ERC20Basic {

    function totalSupply() public view returns (uint256);

    function balanceOf(address who) public view returns (uint256);

    function transfer(address to, uint256 value) public returns (bool);

    event Transfer(address indexed from, address indexed to, uint256 value);

}

// ----------------------------------------------------------------------------

// @title ERC20 interface

// @dev See https://github.com/ethereum/EIPs/issues/20

// ----------------------------------------------------------------------------

contract ERC20 is ERC20Basic {

    function allowance(address owner, address spender) public view returns (uint256);

    function transferFrom(address from, address to, uint256 value) public returns (bool);

    function approve(address spender, uint256 value) public returns (bool); 

    event Approval(address indexed owner, address indexed spender, uint256 value);

}

// ----------------------------------------------------------------------------

// @title Basic token

// @dev Basic version of StandardToken, with no allowances.

// ----------------------------------------------------------------------------

contract BasicToken is ERC20Basic {

    using SafeMath for uint256;



    mapping(address => uint256) balances;



    uint256 totalSupply_;



    function totalSupply() public view returns (uint256) {

        return totalSupply_;

    }



    function transfer(address _to, uint256 _value) public returns (bool) {

        require(_to != address(0));

        require(_value <= balances[msg.sender]);



        balances[msg.sender] = balances[msg.sender].sub(_value);

        balances[_to] = balances[_to].add(_value);

    

        emit Transfer(msg.sender, _to, _value);

        return true;

    }



    function balanceOf(address _owner) public view returns (uint256) {

        return balances[_owner];

    }

}

// ----------------------------------------------------------------------------

// @title Ownable

// ----------------------------------------------------------------------------

contract Ownable {

    // Development Team Leader

    address public owner;



    constructor() public {

        owner    = msg.sender;

    }



    modifier onlyOwner() { require(msg.sender == owner); _; }

}

// ----------------------------------------------------------------------------

// @title BlackList

// @dev Base contract which allows children to implement an emergency stop mechanism.

// ----------------------------------------------------------------------------

contract BlackList is Ownable {



    event Lock(address indexed LockedAddress);

    event Unlock(address indexed UnLockedAddress);



    mapping( address => bool ) public blackList;



    modifier CheckBlackList { require(blackList[msg.sender] != true); _; }



    function SetLockAddress(address _lockAddress) external onlyOwner returns (bool) {

        require(_lockAddress != address(0));

        require(_lockAddress != owner);

        require(blackList[_lockAddress] != true);

        

        blackList[_lockAddress] = true;

        

        emit Lock(_lockAddress);



        return true;

    }



    function UnLockAddress(address _unlockAddress) external onlyOwner returns (bool) {

        require(blackList[_unlockAddress] != false);

        

        blackList[_unlockAddress] = false;

        

        emit Unlock(_unlockAddress);



        return true;

    }

}

// ----------------------------------------------------------------------------

// @title Pausable

// @dev Base contract which allows children to implement an emergency stop mechanism.

// ----------------------------------------------------------------------------

contract Pausable is Ownable {

    event Pause();

    event Unpause();



    bool public paused = false;



    modifier whenNotPaused() { require(!paused); _; }

    modifier whenPaused() { require(paused); _; }



    function pause() onlyOwner whenNotPaused public {

        paused = true;

        emit Pause();

    }



    function unpause() onlyOwner whenPaused public {

        paused = false;

        emit Unpause();

    }

}

// ----------------------------------------------------------------------------

// @title Standard ERC20 token

// @dev Implementation of the basic standard token.

// https://github.com/ethereum/EIPs/issues/20

// ----------------------------------------------------------------------------

contract StandardToken is ERC20, BasicToken {

  

    mapping (address => mapping (address => uint256)) internal allowed;



    function transferFrom(address _from, address _to, uint256 _value) public returns (bool) {

        require(_to != address(0));

        require(_value <= balances[_from]);

        require(_value <= allowed[_from][msg.sender]);



        balances[_from] = balances[_from].sub(_value);

        balances[_to] = balances[_to].add(_value);

        allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_value);

    

        emit Transfer(_from, _to, _value);

    

        return true;

    }



    function approve(address _spender, uint256 _value) public returns (bool) {

        allowed[msg.sender][_spender] = _value;

    

        emit Approval(msg.sender, _spender, _value);

    

        return true;

    }



    function allowance(address _owner, address _spender) public view returns (uint256) {

        return allowed[_owner][_spender];

    }



    function increaseApproval(address _spender, uint256 _addedValue) public returns (bool) {

        allowed[msg.sender][_spender] = (allowed[msg.sender][_spender].add(_addedValue));

    

        emit Approval(msg.sender, _spender, allowed[msg.sender][_spender]);

    

        return true;

    }



    function decreaseApproval(address _spender, uint256 _subtractedValue) public returns (bool) {

        uint256 oldValue = allowed[msg.sender][_spender];

    

        if (_subtractedValue > oldValue) {

        allowed[msg.sender][_spender] = 0;

        } else {

        allowed[msg.sender][_spender] = oldValue.sub(_subtractedValue);

        }

    

        emit Approval(msg.sender, _spender, allowed[msg.sender][_spender]);

        return true;

    }

}

// ----------------------------------------------------------------------------

// @title MultiTransfer Token

// @dev Only Admin

// ----------------------------------------------------------------------------

contract MultiTransferToken is StandardToken, Ownable {



    function MultiTransfer(address[] _to, uint256[] _amount) onlyOwner public returns (bool) {

        require(_to.length == _amount.length);



        uint256 ui;

        uint256 amountSum = 0;

    

        for (ui = 0; ui < _to.length; ui++) {

            require(_to[ui] != address(0));



            amountSum = amountSum.add(_amount[ui]);

        }



        require(amountSum <= balances[msg.sender]);



        for (ui = 0; ui < _to.length; ui++) {

            balances[msg.sender] = balances[msg.sender].sub(_amount[ui]);

            balances[_to[ui]] = balances[_to[ui]].add(_amount[ui]);

        

            emit Transfer(msg.sender, _to[ui], _amount[ui]);

        }

    

        return true;

    }

}

// ----------------------------------------------------------------------------

// @title Burnable Token

// @dev Token that can be irreversibly burned (destroyed).

// ----------------------------------------------------------------------------

contract BurnableToken is StandardToken, Ownable {



    event BurnAdminAmount(address indexed burner, uint256 value);



    function burnAdminAmount(uint256 _value) onlyOwner public {

        require(_value <= balances[msg.sender]);



        balances[msg.sender] = balances[msg.sender].sub(_value);

        totalSupply_ = totalSupply_.sub(_value);

    

        emit BurnAdminAmount(msg.sender, _value);

        emit Transfer(msg.sender, address(0), _value);

    }

}

// ----------------------------------------------------------------------------

// @title Mintable token

// @dev Simple ERC20 Token example, with mintable token creation

// Based on code by TokenMarketNet: https://github.com/TokenMarketNet/ico/blob/master/contracts/MintableToken.sol

// ----------------------------------------------------------------------------

contract MintableToken is StandardToken, Ownable {

    event Mint(address indexed to, uint256 amount);

    event MintFinished();



    bool public mintingFinished = false;



    modifier canMint() { require(!mintingFinished); _; }

    modifier cannotMint() { require(mintingFinished); _; }



    function mint(address _to, uint256 _amount) onlyOwner canMint public returns (bool) {

        totalSupply_ = totalSupply_.add(_amount);

        balances[_to] = balances[_to].add(_amount);

    

        emit Mint(_to, _amount);

        emit Transfer(address(0), _to, _amount);

    

        return true;

    }



    function finishMinting() onlyOwner canMint public returns (bool) {

        mintingFinished = true;

        emit MintFinished();

        return true;

    }

}

// ----------------------------------------------------------------------------

// @title Pausable token

// @dev StandardToken modified with pausable transfers.

// ----------------------------------------------------------------------------

contract PausableToken is StandardToken, Pausable, BlackList {



    function transfer(address _to, uint256 _value) public whenNotPaused CheckBlackList returns (bool) {

        return super.transfer(_to, _value);

    }



    function transferFrom(address _from, address _to, uint256 _value) public whenNotPaused CheckBlackList returns (bool) {

        return super.transferFrom(_from, _to, _value);

    }



    function approve(address _spender, uint256 _value) public whenNotPaused CheckBlackList returns (bool) {

        return super.approve(_spender, _value);

    }



    function increaseApproval(address _spender, uint _addedValue) public whenNotPaused CheckBlackList returns (bool success) {

        return super.increaseApproval(_spender, _addedValue);

    }



    function decreaseApproval(address _spender, uint _subtractedValue) public whenNotPaused CheckBlackList returns (bool success) {

        return super.decreaseApproval(_spender, _subtractedValue);

    }

}

// ----------------------------------------------------------------------------

// @Project 

// @Creator

// @Source

// ----------------------------------------------------------------------------

contract OasisCity is PausableToken, MintableToken, BurnableToken, MultiTransferToken {

    string public name = "OasisCity";
    string public symbol = "OSC";
    uint256 public decimals = 18;

}
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