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Design Pattern Decisions

This project made use of the following patterns.

Inheritance

The FractionalizeNFT contract inherits from OpenZeppelin's IERC721Receiver to enable use of safeTransfer() (from OpenZeppelin's ERC721 implementation) to transfer ERC721 assets to the FractionalizeNFT contract. TestNFT inherits from OpenZeppelin's ERC721URIStorage to ensure that it uses a well-tested implementation of the ERC721 standard and from OpenZeppelin's Ownable contracts (see Ownable Pattern, below).

Inter-Contract Execution

The FractionalizeNFT contract calls external fuctions from OpenZeppelin contracts, in particular, it creates new ERC20 tokens (upon NFT fractionalization) using the constructor from OpenZeppelin's ERC20 implementation.

Ownable Pattern

The TestNFT contract inherits from OpenZeppelin's Ownable contract to ensure that its mintNFT() method may only be called by the deployer.