first round time bitmap id

index/timeframe.go

@@ -0,0 +1,52 @@
+package index
+
+import "time"
+
+type TimeQuantum uint
+
+const (
+	Y TimeQuantum = 0
+	YM
+	YMD
+	YMDH
+)
+
+func PackTimeBits(t TimeQuantum, year uint, month uint, day uint, hour uint) uint64 {
+	v := uint64((uint(t) << 30) | (year << 24) | (month << 20) | (day << 15) | (hour << 10))
+	v = v << 32
+	return v
+}
+
+func getTimeIds(tile_id uint64, atime time.Time, min_quantum TimeQuantum, offset uint) []uint64 {
+	results := make([]uint64, 0, 4)
+	year := uint(atime.Year()) - offset
+	month := atime.Month()
+	day := atime.Day()
+	hour := atime.Hour()
+
+	if min_quantum <= Y {
+		id := PackTimeBits(Y, year, 0, 0, 0)
+		id = id | tile_id
+		results = append(results, id)
+	}
+
+	if min_quantum <= YM {
+		id := PackTimeBits(YM, uint(year), uint(month), 0, 0)
+		id = id | tile_id
+		results = append(results, id)
+	}
+
+	if min_quantum <= YMD {
+		id := PackTimeBits(YMD, year, uint(month), uint(day), 0)
+		id = id | tile_id
+		results = append(results, id)
+	}
+
+	if min_quantum <= YMDH {
+		id := PackTimeBits(Y, year, uint(month), uint(day), uint(hour))
+		id = id | tile_id
+		results = append(results, id)
+	}
+
+	return results
+}

index/timeframe_test.go

@@ -0,0 +1,24 @@
+package index
+
+import (
+	"fmt"
+	"testing"
+	"time"
+
+	"github.com/davecgh/go-spew/spew"
+	. "github.com/smartystreets/goconvey/convey"
+)
+
+func TestTimeFrame(t *testing.T) {
+
+	Convey("Test ID", t, func() {
+		const shortForm = "2006-01-02 15:04"
+		x, _ := time.Parse(shortForm, "2014-01-01 10:03")
+		fmt.Println(x)
+
+		m := getTimeIds(uint64(1), x, YMDH, 2014)
+		spew.Dump(m)
+		So(1, ShouldEqual, 1)
+	})
+
+}