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contracts...RegisterDomainName.sol

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;
import "@openzeppelin/contracts/access/Ownable.sol";

contract Record {
    uint256 public timeOfCreation; 

    constructor() {
        timeOfCreation = block.timestamp; 
    }
}


contract StringRecord is Record {
    string public record;

    function getRecordType() public pure returns(string memory) {
        return "string";
    }

    function setRecord(string memory _record) public {
        record = _record;
    }
}

contract AddressRecord is Record {
    address public record;

    function getRecordType() public pure returns(string memory) {
        return "address";
    }

    function setRecord(address _record) public {
        record = _record;
    }
}

contract EnsRecord is Record {
    string public domain;
    address public ownner;

    function getRecordType() public pure returns(string memory) {
        return "ens";
    }

    function setOwner(address _ownner) public {
        ownner = _ownner;
    }
}


contract RecordsStorage is Ownable {
    constructor() Ownable(msg.sender) {}

    Record[] public records;
    mapping(address => bool) private factories;

    function addRecord(Record _record) public {
        require(factories[msg.sender] == true, "not");
        records.push(_record);
    }

    function addFactory(address _address) public onlyOwner {
        factories[_address] = true;
    }
}

abstract contract Factory {
    RecordsStorage public addedRecord; 

    constructor(RecordsStorage _addedRecord) {
        addedRecord = _addedRecord; 
    }

    function onRecordAdding(Record _record) internal {
        addedRecord.addRecord(_record);
    }
}


contract StringRecordFactory is Factory {
    constructor(RecordsStorage _address) Factory(_address) {}

    function onRecordAdding() public {
        StringRecord newRecord = new StringRecord();
        onRecordAdding(newRecord);
    }
}

contract AddressRecordFactory is Factory {
    constructor(RecordsStorage _address) Factory(_address) {}

    function onRecordAdding() internal {
        AddressRecord newRecord = new AddressRecord();
        onRecordAdding(newRecord);
    }
}

contract EnsRecordFactory is Factory {
    constructor(RecordsStorage _address) Factory(_address) {}

    function onRecordAdding() internal {
        EnsRecord newRecord = new EnsRecord();
        onRecordAdding(newRecord);
    }
}