NameAddressTranslator.sol

pragma solidity ^0.4.23;

contract NameAddressTranslator {
    
    mapping(bytes32 => address) nameRegistry;
    mapping(address => string) addressRegistry;
    
    function toName(address _address) public view returns (string) {
        return addressRegistry[_address];
    }
    
    function toAddress(string _name) public view returns (address) {
        return nameRegistry[keccak256(_name)];
    }
    
    function register(string _name) public {
        bytes32 index = keccak256(_name);
        
        require (nameRegistry[index] == address(0));
        require (bytes(_name).length != 0);
        
        nameRegistry[index] = msg.sender;
        
        if (bytes(addressRegistry[msg.sender]).length == 0)
            addressRegistry[msg.sender] = _name;
    }
    
    function remap(string _name, address _address) public {
        bytes32 index = keccak256(_name);
        
        require (nameRegistry[index] == msg.sender);
        
        nameRegistry[index] = _address;
        
        addressRegistry[_address] = _name;
        addressRegistry[msg.sender] = "";
    }
    
}