public Operation getOrDefault(final byte opcode, final Operation defaultOperation) {
    final Operation operation = get(opcode);

    if (operation == null) {
      return defaultOperation;
    }

    return operation;
  }
Gets or default.

@param opcode the opcode
@param defaultOperation the default operation
@return the or default
evm/src/main/java/org/hyperledger/besu/evm/operation/OperationRegistry.java