gno.land/p/g17khqpukees4237dtn3astzapmp462vjhsz6st4/datastore⧉

1// Package datastore provides support to store multiple collections of records.2package datastore34import (5	"errors"67	"gno.land/p/nt/bptree/v0"8)910// ErrStorageExists indicates that a storage exists with the same name.11var ErrStorageExists = errors.New("a storage with the same name exists")1213// NewDatastore creates a new store.14func NewDatastore() *Datastore {15	return &Datastore{16		storages: bptree.NewBPTree32(),17	}18}1920// Datastore is a store that can contain multiple named storages.21// A storage is a collection of records.22//23// Example usage:24//25//	// Create an empty storage to store user records26//	var db Datastore27//	storage := db.CreateStorage("users")28//29//	// Get a storage that has been created before30//	storage = db.GetStorage("profiles")31type Datastore struct {32	storages *bptree.BPTree // string(name) -> *Storage33}3435// CreateStorage creates a new named storage within the data store.36func (ds *Datastore) CreateStorage(name string, options ...StorageOption) *Storage {37	if ds.storages.Has(name) {38		return nil39	}4041	s := NewStorage(name, options...)42	ds.storages.Set(name, &s)43	return &s44}4546// HasStorage checks if data store contains a storage with a specific name.47func (ds *Datastore) HasStorage(name string) bool {48	return ds.storages.Has(name)49}5051// GetStorage returns a storage that has been created with a specific name.52// It returns nil when a storage with the specified name is not found.53func (ds *Datastore) GetStorage(name string) *Storage {54	if s, ok := ds.storages.Get(name).(*Storage); ok {55		return s56	}57	return nil58}59