IHoldable.sol

pragma solidity ^0.5.0;

interface IHoldable {
    enum HoldStatusCode {
        Nonexistent,
        Ordered,
        Executed,
        ExecutedAndKeptOpen,
        ReleasedByNotary,
        ReleasedByPayee,
        ReleasedOnExpiration
    }

    function hold(
        string calldata operationId,
        address to,
        address notary,
        uint256 value,
        uint256 timeToExpiration
    ) external returns (bool);
    function holdFrom(
        string calldata operationId,
        address from,
        address to,
        address notary,
        uint256 value,
        uint256 timeToExpiration
    ) external returns (bool);
    function holdWithExpirationDate(
        string calldata operationId,
        address to,
        address notary,
        uint256 value,
        uint256 expiration
    ) external returns (bool);
    function holdFromWithExpirationDate(
        string calldata operationId,
        address from,
        address to,
        address notary,
        uint256 value,
        uint256 expiration
    ) external returns (bool);
    function releaseHold(string calldata operationId) external returns (bool);
    function executeHold(string calldata operationId, uint256 value) external returns (bool);
    function executeHoldAndKeepOpen(string calldata operationId, uint256 value) external returns (bool);
    function renewHold(string calldata operationId, uint256 timeToExpiration) external returns (bool);
    function renewHoldWithExpirationDate(string calldata operationId, uint256 expiration) external returns (bool);
    function retrieveHoldData(string calldata operationId) external view returns (
        address issuer,
        address from,
        address to,
        address notary,
        uint256 value,
        uint256 expiration,
        HoldStatusCode status
    );

    function balanceOnHold(address account) external view returns (uint256);
    function netBalanceOf(address account) external view returns (uint256);
    function totalSupplyOnHold() external view returns (uint256);

    function authorizeHoldOperator(address operator) external returns (bool);
    function revokeHoldOperator(address operator) external returns (bool);
    function isHoldOperatorFor(address operator, address from) external view returns (bool);

    event HoldCreated(
        address indexed holdIssuer,
        string  operationId,
        address from,
        address to,
        address indexed notary,
        uint256 value,
        uint256 expiration
    );
    event HoldExecuted(address indexed holdIssuer, string operationId, address indexed notary, uint256 heldValue, uint256 transferredValue);
    event HoldExecutedAndKeptOpen(address indexed holdIssuer, string operationId, address indexed notary, uint256 heldValue,
        uint256 transferredValue);
    event HoldReleased(address indexed holdIssuer, string operationId, HoldStatusCode status);
    event HoldRenewed(address indexed holdIssuer, string operationId, uint256 oldExpiration, uint256 newExpiration);
    event HoldOperatorAuthorized(address indexed operator, address indexed account);
    event RevokedHoldOperator(address indexed operator, address indexed account);
}