NewIndexBasedSegment will init a new segment.

NewObject will create a new object with client.

NewStorageMeta will create a new StorageMeta.

NewStorageStatistic will create a new StorageStatistic.

ObjectTypeDir means this object is a dir object which doesn't have content.

ObjectTypeFile means this object is file-alike object which owns content.

ObjectTypeLink means this object is a link object which contains a link target to another object.

ObjectTypeUnknown means storager can't recognize which type of this object.

IterateDone means this iterator has returned all data.

IndexBasedPart is a part of segment.

IndexBasedSegment will hold the whole segment operations.

Pair will store option for storage service.

Copier is the interface for Copy.

DirLister is used for directory based storage service to list objects under a dir.

DirSegmentsLister is used for directory based storage service to list segments under a dir.

IndexSegmenter is the interface for index based segment.

Mover is the interface for Move.

PrefixLister is used for prefix based storage service to list objects under a prefix.

PrefixSegmentsLister is used for prefix based storage service to list segments under a prefix.

Reacher is the interface for Reach.

Segment is carries basic segment info.

Servicer can maintain multipart storage services.

Statistician is the interface for Statistical.

Storager is the interface for storage service.

NextObjectFunc is the func used in iterator.

NextObjectFunc is the func used in iterator.

NextObjectFunc is the func used in iterator.

ObjectType is the type for object, under layer type is string.