ballot.sol

pragma solidity ^0.4.4;

import "./Ownable.sol";
import "./CopaCoin.sol";
import "./Utils.sol";

contract RecuperarClase is Ownable {
    
    using Utils for Utils;
    
    struct Proposal {
        bytes32 name;
        uint8 votesCount;
    }
    Proposal[] public proposals;
    CopaCoin copaCoinContract;
    
    function RecuperarClase() public {
        copaCoinContract = new CopaCoin();
    }
    
    modifier proposalNotExists(bytes32 _proposal) {
        for (uint256 i = 0; i < proposals.length ; i++) {
            require(_proposal != proposals[i].name);
        }
        
        //    Este guion bajo se reemplaza por el cuerpo de la funcion 
        //    que esta aplicando el modifier
        
        _;
    }
    
    function addProposal(bytes32 _proposal) public onlyOwner proposalNotExists(_proposal) {
        proposals.push(Proposal({name: _proposal, votesCount: 0}));
    }
    
    function bytes32ToString(bytes32 x) public pure returns (string) {
        bytes memory bytesString = new bytes(32);
        uint charCount = 0;
        for (uint j = 0; j < 32; j++) {
            byte char = byte(bytes32(uint(x) * 2 ** (8 * j)));
            if (char != 0) {
                bytesString[charCount] = char;
                charCount++;
            }
        }
        bytes memory bytesStringTrimmed = new bytes(charCount);
        for (j = 0; j < charCount; j++) {
            bytesStringTrimmed[j] = bytesString[j];
        }
        return string(bytesStringTrimmed);
    }
    
    function getProposal(uint256 _index) public constant returns (string proposal) {
        return bytes32ToString(proposals[_index].name);
    }
    
    function getProposalVotesCount(uint256 _index) public constant returns (uint8 proposal) {
        return proposals[_index].votesCount;
    }
    
    function getProposalsCount() public constant returns (uint256) {
        return proposals.length;
    }
    
    modifier hasCoins {
        require(copaCoinContract.balanceOf(msg.sender) > 0);
        _;
    }
    
    function voteProposal(uint256 _index) public {
        //require(copaCoinContract.spend(1));
        proposals[_index].votesCount = proposals[_index].votesCount + 1;
    }
    
}