ProtocolAdapter.sol

// Copyright (C) 2020 Zerion Inc. <https://zerion.io>
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
//
// SPDX-License-Identifier: LGPL-3.0-only

pragma solidity 0.7.6;
pragma experimental ABIEncoderV2;

/**
 * @title Protocol adapter abstract contract.
 * @dev adapterType(), tokenType(), and getBalance() functions MUST be implemented.
 * @author Igor Sobolev <sobolev@zerion.io>
 */
abstract contract ProtocolAdapter {
    /**
     * @dev MUST return amount and type of the given token
     * locked on the protocol by the given account.
     */
    function getBalance(address token, address account) public virtual returns (int256);
}