// Return the instance, properly unmarshaled, given the entry in the database, which is
// the hash for the Instance (vv) followed by the source from which to unmarshal (v)
func (d *BoltDB) GetInstance(v []byte) fct.IBlock {
var vv [32]byte
copy(vv[:], v[:32])
v = v[32:]
var instance fct.IBlock = d.instances[vv]
if instance == nil {
vp := fct.NewHash(vv[:])
fct.Prtln("Object hash: ", vp)
panic("This should not happen. Object stored in the database has no IBlock instance")
}
r := instance.GetNewInstance()
if r == nil {
panic("An IBlock has failed to implement GetNewInstance()")
}
datalen, v := binary.BigEndian.Uint32(v[0:4]), v[4:]
if len(v) != int(datalen) {
fct.Prtln("Lengths don't match. Expected ", datalen, " and got ", len(v))
panic("Data not returned properly")
}
err := r.UnmarshalBinary(v)
if err != nil {
panic("This should not happen. IBlock failed to unmarshal.")
}
return r
}
