QueryDiamond.sol

pragma solidity ^0.8.16;                                                       
                                                                               
import '../lib/diamond-3-hardhat/contracts/facets/DiamondCutFacet.sol';        
import '../lib/diamond-3-hardhat/contracts/facets/OwnershipFacet.sol';         
import '../lib/diamond-3-hardhat/contracts/facets/DiamondLoupeFacet.sol';      
import '../lib/diamond-3-hardhat/contracts/libraries/LibDiamond.sol';          
import '../lib/diamond-3-hardhat/contracts/interfaces/IERC165.sol';            
import '../lib/diamond-3-hardhat/contracts/interfaces/IERC173.sol';            
                                                                               
contract QueryDiamond is OwnershipFacet, DiamondCutFacet, DiamondLoupeFacet {
  constructor() {                                                              
                                                                               
    LibDiamond.DiamondStorage storage ds = LibDiamond.diamondStorage();        
    ds.contractOwner = msg.sender;                                             
    ds.supportedInterfaces[type(IERC165).interfaceId] = true;                  
    ds.supportedInterfaces[type(IERC173).interfaceId] = true;                  
    ds.supportedInterfaces[type(IDiamondCut).interfaceId] = true;              
    ds.supportedInterfaces[type(IDiamondLoupe).interfaceId] = true;            
  }                                                                            
                                                                               
  function lookupSelector(bytes4 selector) external view returns (address) {   
    LibDiamond.DiamondStorage storage ds = LibDiamond.diamondStorage();        
    return ds.selectorToFacetAndPosition[selector].facetAddress;               
  }                                                                            
                                                                               
  function setImmutableFacet(address facet) external {                         
    LibDiamond.enforceIsContractOwner();                                       
    LibDiamond.setImmutableFacet(facet);                                       
  }                                                                            
}