BasePoolFactory.sol

// SPDX-License-Identifier: GPL-3.0-or-later
// 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 <http://www.gnu.org/licenses/>.

pragma solidity ^0.7.0;
pragma experimental ABIEncoderV2;

import "@balancer-labs/v2-vault/contracts/interfaces/IVault.sol";

/**
 * @dev Base contract for Pool factories.
 *
 * Pools are deployed from factories to allow third parties to reason about them. Unknown Pools may have arbitrary
 * logic: being able to assert that a Pool's behavior follows certain rules (those imposed by the contracts created by
 * the factory) is very powerful.
 */
abstract contract BasePoolFactory {
    IVault private immutable _vault;
    mapping(address => bool) private _isPoolFromFactory;

    event PoolCreated(address indexed pool);

    constructor(IVault vault) {
        _vault = vault;
    }

    /**
     * @dev Returns the Vault's address.
     */
    function getVault() public view returns (IVault) {
        return _vault;
    }

    /**
     * @dev Returns true if `pool` was created by this factory.
     */
    function isPoolFromFactory(address pool) external view returns (bool) {
        return _isPoolFromFactory[pool];
    }

    /**
     * @dev Registers a new created pool.
     *
     * Emits a `PoolCreated` event.
     */
    function _register(address pool) internal {
        _isPoolFromFactory[pool] = true;
        emit PoolCreated(pool);
    }
}