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pragma solidity ^0.4.11;
import "../Events/Event.sol";
/// @title Categorical event contract - Categorical events resolve to an outcome from a set of outcomes
/// @author Stefan George - <stefan@gnosis.pm>
contract CategoricalEvent is Event {
/*
* Public functions
*/
/// @dev Contract constructor validates and sets basic event properties
/// @param _collateralToken Tokens used as collateral in exchange for outcome tokens
/// @param _oracle Oracle contract used to resolve the event
/// @param outcomeCount Number of event outcomes
constructor(
Token _collateralToken,
Oracle _oracle,
uint8 outcomeCount
)
public
Event(_collateralToken, _oracle, outcomeCount)
{
}
/// @dev Exchanges sender's winning outcome tokens for collateral tokens
/// @return Sender's winnings
function redeemWinnings()
public
returns (uint winnings)
{
// Winning outcome has to be set
require(isOutcomeSet);
// Calculate winnings
winnings = outcomeTokens[uint(outcome)].balanceOf(msg.sender);
// Revoke tokens from winning outcome
outcomeTokens[uint(outcome)].revoke(msg.sender, winnings);
// Payout winnings
require(collateralToken.transfer(msg.sender, winnings));
emit WinningsRedemption(msg.sender, winnings);
}
/// @dev Calculates and returns event hash
/// @return Event hash
function getEventHash()
public
view
returns (bytes32)
{
return keccak256(abi.encodePacked(collateralToken, oracle, outcomeTokens.length));
}
}
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