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pragma solidity ^0.6.2;

import './Ownable.sol';

contract Settings is Ownable {

  constructor() public {
  }
  
  
    struct Entry{
        uint index; // index start 1 to keyList.length
        address value;
    }
    
    mapping(bytes32 => Entry) internal map;
    bytes32[] internal keyList;

    function add(bytes32 _key, address _value) onlyOwner public {
        Entry storage entry = map[_key];
        entry.value = _value;
        if(entry.index > 0){ // entry exists
            // do nothing
            return;
        }else { // new entry
            keyList.push(_key);
            uint keyListIndex = keyList.length - 1;
            entry.index = keyListIndex + 1;
        }
    }

    function remove(bytes32 _key) onlyOwner public {
        Entry storage entry = map[_key];
        require(entry.index != 0); // entry not exist
        require(entry.index <= keyList.length); // invalid index value
        
        // Move an last element of array into the vacated key slot.
        uint keyListIndex = entry.index - 1;
        uint keyListLastIndex = keyList.length - 1;
        map[keyList[keyListLastIndex]].index = keyListIndex + 1;
        keyList[keyListIndex] = keyList[keyListLastIndex];
        keyList.pop();
        delete map[_key];
    }
    
    function size() public view returns (uint) {
        return uint(keyList.length);
    }
    
    function contains(bytes32 _key) public view returns (bool) {
        return map[_key].index > 0;
    }
    
    function getByKey(bytes32 _key) public view returns (address) {
        return map[_key].value;
    }
    
    function getByIndex(uint _index) public view returns (address) {
        require(_index >= 0);
        require(_index < keyList.length);
        return map[keyList[_index]].value;
    }

    function getKeys() public view returns ( bytes32[] memory) {
        return keyList;
    }

}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor () internal {
        _owner = msg.sender;
        emit OwnershipTransferred(address(0), msg.sender);
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(_owner == msg.sender, "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

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[{"inputs":[],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"inputs":[{"internalType":"bytes32","name":"_key","type":"bytes32"},{"internalType":"address","name":"_value","type":"address"}],"name":"add","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"_key","type":"bytes32"}],"name":"contains","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_index","type":"uint256"}],"name":"getByIndex","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"_key","type":"bytes32"}],"name":"getByKey","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getKeys","outputs":[{"internalType":"bytes32[]","name":"","type":"bytes32[]"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"_key","type":"bytes32"}],"name":"remove","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"size","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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