pragma solidity ^0.4.24;

import "./Pausable.sol";
import "./ReclaimTokens.sol";

/**
 * @title Core functionality for registry upgradability
 */
contract PolymathRegistry is ReclaimTokens {

    mapping (bytes32 => address) public storedAddresses;

    event LogChangeAddress(string _nameKey, address indexed _oldAddress, address indexed _newAddress);

    /**
     * @notice Get the contract address
     * @param _nameKey is the key for the contract address mapping
     * @return address
     */
    function getAddress(string _nameKey) view public returns(address) {
        bytes32 key = keccak256(bytes(_nameKey));
        require(storedAddresses[key] != address(0), "Invalid address key");
        return storedAddresses[key];
    }

    /**
     * @notice change the contract address
     * @param _nameKey is the key for the contract address mapping
     * @param _newAddress is the new contract address
     */
    function changeAddress(string _nameKey, address _newAddress) public onlyOwner {
        bytes32 key = keccak256(bytes(_nameKey));
        emit LogChangeAddress(_nameKey, storedAddresses[key], _newAddress);
        storedAddresses[key] = _newAddress;
    }


}