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https://github.com/featurebasedb/featurebase.git
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52 lines
1.1 KiB
Go
52 lines
1.1 KiB
Go
package index
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import "time"
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type TimeQuantum uint
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const (
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Y TimeQuantum = 0
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YM
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YMD
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YMDH
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)
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func PackTimeBits(t TimeQuantum, year uint, month uint, day uint, hour uint) uint64 {
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v := uint64((uint(t) << 30) | (year << 24) | (month << 20) | (day << 15) | (hour << 10))
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v = v << 32
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return v
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}
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func getTimeIds(tile_id uint64, atime time.Time, min_quantum TimeQuantum, offset uint) []uint64 {
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results := make([]uint64, 0, 4)
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year := uint(atime.Year()) - offset
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month := atime.Month()
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day := atime.Day()
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hour := atime.Hour()
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if min_quantum <= Y {
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id := PackTimeBits(Y, year, 0, 0, 0)
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id = id | tile_id
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results = append(results, id)
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}
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if min_quantum <= YM {
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id := PackTimeBits(YM, uint(year), uint(month), 0, 0)
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id = id | tile_id
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results = append(results, id)
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}
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if min_quantum <= YMD {
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id := PackTimeBits(YMD, year, uint(month), uint(day), 0)
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id = id | tile_id
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results = append(results, id)
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}
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if min_quantum <= YMDH {
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id := PackTimeBits(Y, year, uint(month), uint(day), uint(hour))
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id = id | tile_id
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results = append(results, id)
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}
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return results
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}
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