dsindex

type Indexer interface {
	// Add adds the specified value to the key
	Add(ctx context.Context, key, value string) error

	// Delete deletes the specified value from the key.  If the value is not in
	// the datastore, this method returns no error.
	Delete(ctx context.Context, key, value string) error

	// DeleteKey deletes all values in the given key.  If a key is not in the
	// datastore, this method returns no error.  Returns a count of values that
	// were deleted.
	DeleteKey(ctx context.Context, key string) (count int, err error)

	// DeleteAll deletes all keys managed by this Indexer.  Returns a count of
	// the values that were deleted.
	DeleteAll(ctx context.Context) (count int, err error)

	// ForEach calls the function for each value in the specified key, until
	// there are no more values, or until the function returns false.  If key
	// is empty string, then all keys are iterated.
	ForEach(ctx context.Context, key string, fn func(key, value string) bool) error

	// HasValue determines if the key contains the specified value
	HasValue(ctx context.Context, key, value string) (bool, error)

	// HasAny determines if any value is in the specified key.  If key is
	// empty string, then all values are searched.
	HasAny(ctx context.Context, key string) (bool, error)

	// Search returns all values for the given key
	Search(ctx context.Context, key string) (values []string, err error)
}